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Add Circuit Breaker Plugin for Bifrost

This PR introduces a new Circuit Breaker plugin for Bifrost that provides automatic failure detection and recovery for provider requests. The plugin monitors request failures and slow calls, automatically opening the circuit when thresholds are exceeded to prevent cascading failures.

Features

  • Automatic failure detection with configurable failure rate and slow call thresholds
  • Three-state circuit breaker (CLOSED, OPEN, HALF-OPEN) with automatic state transitions
  • Per-provider circuit isolation ensuring failures don't affect other providers
  • Sliding window metrics with support for both count-based and time-based windows
  • Graceful fallback support allowing automatic provider switching when circuits open
  • Thread-safe design with atomic operations for high-performance concurrent access

Implementation Details

  • Added core plugin implementation with atomic state management for thread safety
  • Implemented sliding window metrics supporting both count-based (last N calls) and time-based (last N seconds) collection
  • Added automatic state transitions based on failure rates, slow call rates, and recovery testing
  • Included provider-specific circuit isolation with separate state tracking per AI provider
  • Added context-based request tracking for accurate timing and state management
  • Implemented graceful error handling with detailed error messages and fallback control
  • Created comprehensive test suite covering all circuit states and transition scenarios

Configuration

  • Failure Rate Threshold: Configurable threshold (default: 50%) for triggering circuit open
  • Slow Call Detection: Duration-based slow call detection with rate threshold (default: 5s, 50%)
  • Sliding Window: Configurable window size and type (count-based: 100 calls, time-based: configurable)
  • Recovery Settings: Half-open state configuration with permitted calls and wait duration
  • Minimum Call Threshold: Minimum calls required before circuit evaluation (default: 10)

Documentation

  • Added detailed README with configuration reference, usage examples, and best practices
  • Included state machine documentation explaining circuit breaker behavior and transitions
  • Provided monitoring guidelines for tracking circuit states and performance metrics

The plugin is designed to be lightweight with minimal overhead in normal operation while providing robust failure protection and automatic recovery capabilities for production AI workloads.

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coderabbitai bot commented Jul 1, 2025

Summary by CodeRabbit

  • New Features

    • Introduced a robust circuit breaker plugin for Bifrost, providing automatic detection and handling of failures and slow calls for AI provider requests.
    • Supports configurable thresholds, sliding window metrics (count-based or time-based), and state transitions (Closed, Open, Half-Open) to prevent cascading failures.
    • Includes advanced operations for manual circuit control and comprehensive metrics for observability.
  • Documentation

    • Added a detailed README with setup instructions, configuration options, usage examples, state diagrams, and best practices.
  • Tests

    • Added comprehensive unit tests covering state transitions, slow call detection, metrics tracking, and sliding window behaviors.
  • Chores

    • Added module files and updated dependencies for the new plugin.

Summary by CodeRabbit

  • New Features

    • Introduced a circuit breaker plugin for Bifrost, providing automatic failure and slow call detection with configurable thresholds and state management.
    • Supports both count-based and time-based sliding windows for monitoring provider performance.
    • Exposes metrics and allows querying or resetting circuit states per provider.
  • Documentation

    • Added comprehensive README for the circuit breaker plugin, including quick start, configuration options, state diagrams, and best practices.
  • Tests

    • Added extensive unit tests covering plugin creation, state transitions, recovery, slow call detection, metrics, and sliding window behaviors.
  • Chores

    • Added Go module files for dependency management.
    • Updated core dependency version in test modules.

Walkthrough

Could this BE a bigger change? A full-featured circuit breaker plugin was added to Bifrost, complete with core logic, configuration, state management, sliding window metrics, and comprehensive tests. Documentation and module files were also introduced, and a dependency update was made in the test suite.

Changes

File(s) Change Summary
plugins/circuitbreaker/README.md Added a detailed README explaining the circuit breaker plugin, configuration, usage, and best practices.
plugins/circuitbreaker/go.mod Introduced a new Go module definition with dependencies for the circuit breaker plugin.
plugins/circuitbreaker/main.go Implemented the main circuit breaker plugin logic, state management, hooks, and metrics.
plugins/circuitbreaker/plugin_test.go Added comprehensive unit tests for the plugin covering state transitions, metrics, and recovery.
plugins/circuitbreaker/utils.go Added utility functions for config validation, sliding window metrics, and state management.
tests/core-providers/go.mod Updated bifrost/core dependency from v1.1.5 to v1.1.6.

Sequence Diagram(s)

sequenceDiagram
    participant Client
    participant Bifrost
    participant CircuitBreaker
    participant Provider

    Client->>Bifrost: Sends API request
    Bifrost->>CircuitBreaker: PreHook(request)
    alt Circuit Closed or Half-Open & allowed
        CircuitBreaker-->>Bifrost: Allow request
        Bifrost->>Provider: Forward request
        Provider-->>Bifrost: Response
        Bifrost->>CircuitBreaker: PostHook(response)
        CircuitBreaker-->>Bifrost: Update metrics/state
        Bifrost-->>Client: Return response
    else Circuit Open or Half-Open limit reached
        CircuitBreaker-->>Bifrost: Short-circuit with error
        Bifrost-->>Client: Return error
    end
Loading

Possibly related issues

Suggested reviewers

  • danpiths
  • akshaydeo

Poem

Could this code BE any more resilient?
With circuits that break and states that mend,
Sliding windows count, and failures end.
Tests abound, docs explain,
Bifrost’s safe from cascading pain.
Now, if only it could make coffee too...
(But hey, that’s a feature for Season 2!) ☕


📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: ASSERTIVE
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 85f3db7 and 17dc59b.

📒 Files selected for processing (1)
  • plugins/circuitbreaker/README.md (1 hunks)
🧰 Additional context used
🧠 Learnings (2)
📓 Common learnings
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#84
File: transports/bifrost-http/main.go:2-2
Timestamp: 2025-06-15T16:05:13.489Z
Learning: For the Bifrost project, HTTP transport integration routers for new providers (like Mistral and Ollama) are implemented in separate PRs from the core provider support, following a focused PR strategy.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#54
File: core/schemas/provider.go:148-148
Timestamp: 2025-06-04T03:57:50.981Z
Learning: Breaking changes in the Bifrost codebase are managed by first merging and tagging core schema changes, then updating dependent code references in subsequent steps after the core version is released.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#103
File: .github/workflows/transport-dependency-update.yml:53-75
Timestamp: 2025-06-20T16:21:18.912Z
Learning: In the bifrost repository's transport dependency update workflow, when updating the core dependency to a new version using `go get`, the go.mod and go.sum files will always change in normal operation, making the safety check for changes more of a defensive programming practice rather than handling a common scenario.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#83
File: core/providers/mistral.go:168-170
Timestamp: 2025-06-15T14:24:49.882Z
Learning: In the Bifrost codebase, performance is prioritized over defensive copying for HTTP service operations. Specifically, shallow slice assignments in provider response handling are acceptable due to object pool reset patterns and JSON unmarshaling behavior that minimize practical data corruption risks.
plugins/circuitbreaker/README.md (4)
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#54
File: core/schemas/provider.go:148-148
Timestamp: 2025-06-04T03:57:50.981Z
Learning: Breaking changes in the Bifrost codebase are managed by first merging and tagging core schema changes, then updating dependent code references in subsequent steps after the core version is released.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#79
File: core/bifrost.go:94-103
Timestamp: 2025-06-14T04:06:58.240Z
Learning: In core/bifrost.go, the count parameter in RunPostHooks method is intentionally kept separate from p.executedPreHooks to support circuit breaker plugins that may need to trigger PostHooks for only a subset of executed plugins when detecting failure conditions mid-execution.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#138
File: docs/usage/go-package/mcp.md:408-412
Timestamp: 2025-07-01T12:40:08.576Z
Learning: Pratham-Mishra04 is okay with keeping bullet list formatting that uses colons after dashes in markdown documentation, even if it triggers linter warnings, preferring functionality over strict formatting rules.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#83
File: core/providers/mistral.go:168-170
Timestamp: 2025-06-15T14:24:49.882Z
Learning: In the Bifrost codebase, performance is prioritized over defensive copying for HTTP service operations. Specifically, shallow slice assignments in provider response handling are acceptable due to object pool reset patterns and JSON unmarshaling behavior that minimize practical data corruption risks.
🪛 LanguageTool
plugins/circuitbreaker/README.md

[uncategorized] ~78-~78: A punctuation mark might be missing here.
Context: ...|-------|------|---------|-------------| | FailureRateThreshold | float64 | `...

(AI_EN_LECTOR_MISSING_PUNCTUATION)


[uncategorized] ~175-~175: You might be missing the article “the” here.
Context: ...ed through - Success/failure determines next state - Success → CLOSED (recovery comp...

(AI_EN_LECTOR_MISSING_DETERMINER_THE)


[duplication] ~192-~192: Possible typo: you repeated a word.
Context: ...failures that contribute to the failure rate - Rate Limit Errors (429): Considered failur...

(ENGLISH_WORD_REPEAT_RULE)


[uncategorized] ~196-~196: If this is a compound adjective that modifies the following noun, use a hyphen.
Context: ...rors) This classification ensures that rate limiting issues and server-side problems trigger...

(EN_COMPOUND_ADJECTIVE_INTERNAL)


[style] ~230-~230: ‘emergency situations’ might be wordy. Consider a shorter alternative.
Context: ...anual control functions for testing and emergency situations: ```go // Force the circuit to open st...

(EN_WORDINESS_PREMIUM_EMERGENCY_SITUATIONS)


[style] ~252-~252: ‘emergency situations’ might be wordy. Consider a shorter alternative.
Context: ... sparingly and primarily for testing or emergency situations. The automatic circuit breaker logic is...

(EN_WORDINESS_PREMIUM_EMERGENCY_SITUATIONS)

🪛 markdownlint-cli2 (0.17.2)
plugins/circuitbreaker/README.md

70-70: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


93-93: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


94-94: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


100-100: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


101-101: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


162-162: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


163-163: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


167-167: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


168-168: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


173-173: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


174-174: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


192-192: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)

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@coderabbitai coderabbitai bot requested review from akshaydeo and danpiths July 1, 2025 18:31
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Actionable comments posted: 5

📜 Review details

Configuration used: CodeRabbit UI
Review profile: ASSERTIVE
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between a4cd2e0 and c3b49c2.

⛔ Files ignored due to path filters (3)
  • docs/media/plugins/circuit-breaker-states.png is excluded by !**/*.png
  • plugins/circuitbreaker/go.sum is excluded by !**/*.sum
  • tests/core-providers/go.sum is excluded by !**/*.sum
📒 Files selected for processing (6)
  • plugins/circuitbreaker/README.md (1 hunks)
  • plugins/circuitbreaker/go.mod (1 hunks)
  • plugins/circuitbreaker/main.go (1 hunks)
  • plugins/circuitbreaker/plugin_test.go (1 hunks)
  • plugins/circuitbreaker/utils.go (1 hunks)
  • tests/core-providers/go.mod (1 hunks)
🧰 Additional context used
🧠 Learnings (7)
📓 Common learnings
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#84
File: transports/bifrost-http/main.go:2-2
Timestamp: 2025-06-15T16:05:13.489Z
Learning: For the Bifrost project, HTTP transport integration routers for new providers (like Mistral and Ollama) are implemented in separate PRs from the core provider support, following a focused PR strategy.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#54
File: core/schemas/provider.go:148-148
Timestamp: 2025-06-04T03:57:50.981Z
Learning: Breaking changes in the Bifrost codebase are managed by first merging and tagging core schema changes, then updating dependent code references in subsequent steps after the core version is released.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#103
File: .github/workflows/transport-dependency-update.yml:53-75
Timestamp: 2025-06-20T16:21:18.912Z
Learning: In the bifrost repository's transport dependency update workflow, when updating the core dependency to a new version using `go get`, the go.mod and go.sum files will always change in normal operation, making the safety check for changes more of a defensive programming practice rather than handling a common scenario.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#83
File: core/providers/mistral.go:168-170
Timestamp: 2025-06-15T14:24:49.882Z
Learning: In the Bifrost codebase, performance is prioritized over defensive copying for HTTP service operations. Specifically, shallow slice assignments in provider response handling are acceptable due to object pool reset patterns and JSON unmarshaling behavior that minimize practical data corruption risks.
tests/core-providers/go.mod (12)
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#103
File: .github/workflows/transport-dependency-update.yml:53-75
Timestamp: 2025-06-20T16:21:18.912Z
Learning: In the bifrost repository's transport dependency update workflow, when updating the core dependency to a new version using `go get`, the go.mod and go.sum files will always change in normal operation, making the safety check for changes more of a defensive programming practice rather than handling a common scenario.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/openai_test.go:1-2
Timestamp: 2025-06-16T04:29:53.409Z
Learning: In the Bifrost project, the user prefers to use `package main` for test files in the tests/core-providers directory rather than more descriptive package names like `coreproviders_test`.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/go.mod:38-38
Timestamp: 2025-06-16T03:54:48.005Z
Learning: The `core-providers-test` module in `tests/core-providers/` is an internal testing module that will never be consumed as a dependency by external projects, so the replace directive pointing to `../../core` is acceptable for local development and testing purposes.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#135
File: docs/core-package.md:105-116
Timestamp: 2025-06-27T17:07:39.462Z
Learning: In Go, when importing a package, the identifier used to access it is determined by the `package` declaration in the Go source files, not the directory name. For the Bifrost project, the core directory files declare `package bifrost`, so importing `"github.com/maximhq/bifrost/core"` automatically makes it accessible as `bifrost.Init`, `bifrost.Ptr`, etc., without needing an explicit alias.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#54
File: core/schemas/provider.go:148-148
Timestamp: 2025-06-04T03:57:50.981Z
Learning: Breaking changes in the Bifrost codebase are managed by first merging and tagging core schema changes, then updating dependent code references in subsequent steps after the core version is released.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/automatic_function_calling.go:22-22
Timestamp: 2025-06-16T04:55:11.886Z
Learning: In the Bifrost test suite (tests/core-providers), parallel tests using t.Parallel() are not being implemented currently. The team plans to add parallel test execution in future enhancements.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#55
File: core/go.mod:30-36
Timestamp: 2025-06-04T04:52:31.748Z
Learning: github.com/stretchr/testify v1.10.0 was released on November 23, 2024 and is the latest stable version as of 2024-2025. It includes security fixes for CVE-2022-28948 in gopkg.in/yaml.v3 dependency.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/go.mod:3-4
Timestamp: 2025-06-16T03:55:16.949Z
Learning: Go 1.24 was released in February 2025 and is stable and available for use in go.mod files.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#65
File: transports/bifrost-http/integrations/anthropic/types.go:140-146
Timestamp: 2025-06-10T13:51:52.859Z
Learning: In Bifrost core v1.0.9, ImageContent.Type was a pointer type (*string accessed via bifrost.Ptr), but in v1.0.10 it was changed to a value type (ImageContentType). When reviewing code, check the core version being used to determine the correct assignment pattern.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/end_to_end_tool_calling.go:43-45
Timestamp: 2025-06-16T04:13:55.437Z
Learning: In the Bifrost codebase, errors returned from client methods like ChatCompletionRequest are of type BifrostError, not the standard error interface. For testing these errors, use require.Nilf instead of require.NoErrorf since BifrostError doesn't work with the standard error assertion methods.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/complete_end_to_end.go:39-41
Timestamp: 2025-06-16T04:12:05.427Z
Learning: In the Bifrost system, error returns are of type `BifrostError` rather than the standard Go `error` interface. Therefore, use `require.Nilf(t, err, ...)` instead of `require.NoError(t, err)` when checking for errors in Bifrost function calls.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/simple_chat.go:39-41
Timestamp: 2025-06-16T04:13:42.755Z
Learning: In the Bifrost codebase, errors returned from methods like ChatCompletionRequest are of type BifrostError (a custom error type) rather than the standard Go error interface. Therefore, require.Nilf should be used for error assertions instead of require.NoErrorf.
plugins/circuitbreaker/go.mod (9)
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#103
File: .github/workflows/transport-dependency-update.yml:53-75
Timestamp: 2025-06-20T16:21:18.912Z
Learning: In the bifrost repository's transport dependency update workflow, when updating the core dependency to a new version using `go get`, the go.mod and go.sum files will always change in normal operation, making the safety check for changes more of a defensive programming practice rather than handling a common scenario.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/go.mod:3-4
Timestamp: 2025-06-16T03:55:16.949Z
Learning: Go 1.24 was released in February 2025 and is stable and available for use in go.mod files.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/go.mod:3-4
Timestamp: 2025-06-16T04:27:53.538Z
Learning: In Go module files, `go 1.24.1` (with patch version) can work fine in some setups, contrary to the general rule that go directives should only include major.minor versions.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#79
File: core/bifrost.go:94-103
Timestamp: 2025-06-14T04:06:58.240Z
Learning: In core/bifrost.go, the count parameter in RunPostHooks method is intentionally kept separate from p.executedPreHooks to support circuit breaker plugins that may need to trigger PostHooks for only a subset of executed plugins when detecting failure conditions mid-execution.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/end_to_end_tool_calling.go:43-45
Timestamp: 2025-06-16T04:13:55.437Z
Learning: In the Bifrost codebase, errors returned from client methods like ChatCompletionRequest are of type BifrostError, not the standard error interface. For testing these errors, use require.Nilf instead of require.NoErrorf since BifrostError doesn't work with the standard error assertion methods.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/complete_end_to_end.go:39-41
Timestamp: 2025-06-16T04:12:05.427Z
Learning: In the Bifrost system, error returns are of type `BifrostError` rather than the standard Go `error` interface. Therefore, use `require.Nilf(t, err, ...)` instead of `require.NoError(t, err)` when checking for errors in Bifrost function calls.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#83
File: core/providers/mistral.go:168-170
Timestamp: 2025-06-15T14:24:49.882Z
Learning: In the Bifrost codebase, performance is prioritized over defensive copying for HTTP service operations. Specifically, shallow slice assignments in provider response handling are acceptable due to object pool reset patterns and JSON unmarshaling behavior that minimize practical data corruption risks.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#135
File: docs/core-package.md:105-116
Timestamp: 2025-06-27T17:07:39.462Z
Learning: In Go, when importing a package, the identifier used to access it is determined by the `package` declaration in the Go source files, not the directory name. For the Bifrost project, the core directory files declare `package bifrost`, so importing `"github.com/maximhq/bifrost/core"` automatically makes it accessible as `bifrost.Init`, `bifrost.Ptr`, etc., without needing an explicit alias.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/simple_chat.go:39-41
Timestamp: 2025-06-16T04:13:42.755Z
Learning: In the Bifrost codebase, errors returned from methods like ChatCompletionRequest are of type BifrostError (a custom error type) rather than the standard Go error interface. Therefore, require.Nilf should be used for error assertions instead of require.NoErrorf.
plugins/circuitbreaker/README.md (3)
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#79
File: core/bifrost.go:94-103
Timestamp: 2025-06-14T04:06:58.240Z
Learning: In core/bifrost.go, the count parameter in RunPostHooks method is intentionally kept separate from p.executedPreHooks to support circuit breaker plugins that may need to trigger PostHooks for only a subset of executed plugins when detecting failure conditions mid-execution.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#54
File: core/schemas/provider.go:148-148
Timestamp: 2025-06-04T03:57:50.981Z
Learning: Breaking changes in the Bifrost codebase are managed by first merging and tagging core schema changes, then updating dependent code references in subsequent steps after the core version is released.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#83
File: core/providers/mistral.go:168-170
Timestamp: 2025-06-15T14:24:49.882Z
Learning: In the Bifrost codebase, performance is prioritized over defensive copying for HTTP service operations. Specifically, shallow slice assignments in provider response handling are acceptable due to object pool reset patterns and JSON unmarshaling behavior that minimize practical data corruption risks.
plugins/circuitbreaker/plugin_test.go (2)
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/automatic_function_calling.go:22-22
Timestamp: 2025-06-16T04:55:11.886Z
Learning: In the Bifrost test suite (tests/core-providers), parallel tests using t.Parallel() are not being implemented currently. The team plans to add parallel test execution in future enhancements.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#79
File: core/bifrost.go:94-103
Timestamp: 2025-06-14T04:06:58.240Z
Learning: In core/bifrost.go, the count parameter in RunPostHooks method is intentionally kept separate from p.executedPreHooks to support circuit breaker plugins that may need to trigger PostHooks for only a subset of executed plugins when detecting failure conditions mid-execution.
plugins/circuitbreaker/utils.go (1)
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#84
File: core/providers/ollama.go:59-61
Timestamp: 2025-06-15T14:34:29.401Z
Learning: The `CheckAndSetDefaults()` method on `*schemas.ProviderConfig` in Go does not return any error - it has a void return type and only sets default values on the configuration struct.
plugins/circuitbreaker/main.go (1)
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#79
File: core/bifrost.go:94-103
Timestamp: 2025-06-14T04:06:58.240Z
Learning: In core/bifrost.go, the count parameter in RunPostHooks method is intentionally kept separate from p.executedPreHooks to support circuit breaker plugins that may need to trigger PostHooks for only a subset of executed plugins when detecting failure conditions mid-execution.
🧬 Code Graph Analysis (2)
plugins/circuitbreaker/utils.go (2)
plugins/circuitbreaker/main.go (13)
  • CircuitBreakerConfig (135-144)
  • SlidingWindowType (67-67)
  • CountBased (70-70)
  • TimeBased (71-71)
  • CircuitBreaker (149-155)
  • CircuitState (44-44)
  • StateOpen (48-48)
  • StateClosed (47-47)
  • CountBasedWindow (101-107)
  • CallResult (75-80)
  • WindowMetrics (91-97)
  • TimeBasedWindow (111-115)
  • ProviderCircuitState (120-132)
core/schemas/bifrost.go (2)
  • ModelProvider (37-37)
  • BifrostError (423-430)
plugins/circuitbreaker/main.go (4)
core/schemas/bifrost.go (5)
  • ModelProvider (37-37)
  • BifrostRequest (62-72)
  • BifrostError (423-430)
  • ErrorField (433-440)
  • BifrostResponse (290-300)
plugins/circuitbreaker/utils.go (5)
  • DefaultConfig (13-24)
  • ValidateConfigWithDefaults (28-70)
  • GetCallStartTime (242-247)
  • GetCircuitState (249-254)
  • IsServerError (114-120)
core/schemas/plugin.go (1)
  • PluginShortCircuit (8-11)
core/schemas/provider.go (1)
  • Provider (154-161)
🪛 LanguageTool
plugins/circuitbreaker/README.md

[uncategorized] ~84-~84: A punctuation mark might be missing here.
Context: ...|-------|------|---------|-------------| | FailureRateThreshold | float64 | `...

(AI_EN_LECTOR_MISSING_PUNCTUATION)


[uncategorized] ~159-~159: You might be missing the article “the” here.
Context: ...ed through - Success/failure determines next state - Success → CLOSED (recovery comp...

(AI_EN_LECTOR_MISSING_DETERMINER_THE)

🪛 markdownlint-cli2 (0.17.2)
plugins/circuitbreaker/README.md

69-69: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


98-98: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


99-99: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


105-105: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


106-106: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


146-146: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


147-147: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


151-151: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


152-152: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


157-157: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


158-158: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


193-193: Multiple consecutive blank lines
Expected: 1; Actual: 2

(MD012, no-multiple-blanks)

🪛 golangci-lint (1.64.8)
plugins/circuitbreaker/plugin_test.go

61-61: Error return value of cb.Cleanup is not checked

(errcheck)


224-224: Error return value of cb.Cleanup is not checked

(errcheck)


234-234: Error return value of cb.PreHook is not checked

(errcheck)


241-241: Error return value of cb.PostHook is not checked

(errcheck)


261-261: Error return value of cb.PreHook is not checked

(errcheck)


262-262: Error return value of cb.PostHook is not checked

(errcheck)


299-299: Error return value of cb.PreHook is not checked

(errcheck)


304-304: Error return value of cb.PostHook is not checked

(errcheck)

🔇 Additional comments (14)
tests/core-providers/go.mod (1)

6-6: Could this BE any more aligned?

The core dependency update to v1.1.6 ensures version consistency with the new circuit breaker plugin.

plugins/circuitbreaker/go.mod (1)

1-37: Module configuration looking sharp!

The go.mod setup is spot-on with Go 1.24.1 and the toolchain directive for reproducible builds. The core dependency at v1.1.6 maintains version consistency across the project.

plugins/circuitbreaker/plugin_test.go (1)

1-438: These tests are so comprehensive, they make my commitment to sarcasm look half-hearted!

Excellent test coverage including state transitions, recovery scenarios, slow call detection, and both count-based and time-based sliding windows. The tests effectively validate the circuit breaker's behavior under various conditions.

plugins/circuitbreaker/utils.go (1)

1-255: This utility code is tighter than my jeans after Thanksgiving!

Well-structured utility functions with proper synchronization, sensible defaults, and clean separation of concerns. The validation logic with detailed default tracking is particularly nice.

plugins/circuitbreaker/main.go (10)

1-39: Could this documentation BE any more comprehensive?

The package documentation is excellent with clear explanations of configuration and defaults. Love the usage example!


41-64: Types that are more organized than Monica's closet!

The state enum and String() method are well-implemented with proper handling of unknown states.


74-115: Sliding windows that actually work, unlike the ones in my apartment!

Clean interface design for sliding windows with comprehensive metrics tracking.


117-132: Thread safety that even Ross would understand!

Excellent use of atomic operations for thread-safe state management. The separation between atomic fields and mutex-protected fields is well thought out.


134-170: Configuration options? Could we BE any more thorough?

Well-structured configuration and metrics types providing comprehensive control and observability.


219-252: Double-checked locking that actually works? What are the odds!

Excellent implementation of the double-checked locking pattern for thread-safe provider state creation.


294-356: PreHook implementation that's smoother than Joey's pickup lines!

Excellent state handling with informative error messages and proper fallback support. The atomic operations ensure thread safety.


358-405: PostHook that's more reliable than my commitment issues!

Smart design choice to only count 5xx errors as failures. The defer statement ensures the in-flight counter is always decremented.


422-486: State transitions smoother than Ross's divorce proceedings!

The state machine implementation is solid with proper threshold evaluation and counter management.


489-523: Cleanup that's more thorough than Monica on Thanksgiving!

Good implementation of metrics retrieval and cleanup with proper locking.

}
```

### State Diagram of Circuit Breaker
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🧹 Nitpick (assertive)

Your markdown spacing is giving me commitment issues!

The markdown formatting needs some TLC. Add blank lines around headings and lists for better readability.

Example fixes:

 ### State Diagram of Circuit Breaker
+
 ![Circuit Breaker States](../../docs/media/plugins/circuit-breaker-states.png)
 #### Count-Based Sliding Window
+
 - **Type**: `"count-based"`
 ### CLOSED (Normal Operation)
+
 - Requests are sent to providers normally

Also applies to: 98-106, 146-158

🧰 Tools
🪛 markdownlint-cli2 (0.17.2)

69-69: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)

🤖 Prompt for AI Agents
In plugins/circuitbreaker/README.md at line 69 and also lines 98-106 and
146-158, the markdown headings and lists lack proper blank lines around them,
which affects readability. Add blank lines before and after each heading and
list to improve markdown formatting and ensure consistent spacing for better
visual structure.

)

// String returns the string representation of the circuit state
func (s CircuitState) String() string {
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change the function name to something descriptive - GetCircuitState

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@TejasGhatte TejasGhatte Jul 3, 2025

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I think better to keep it as string, go can infer type based on use. int or string. because GetCircuitState function exists.

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is it for internal usage?

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Actionable comments posted: 1

♻️ Duplicate comments (3)
plugins/circuitbreaker/README.md (2)

69-69: Markdown formatting needs proper spacing.

The markdown formatting lacks proper blank lines around headings and lists, which affects readability. Add blank lines before and after headings and lists as suggested in the previous review.

Also applies to: 92-93, 99-100, 140-141, 145-146, 151-152


153-153: Add missing article "the".

The sentence is missing the article "the" - it should read "Success/failure determines the next state".

plugins/circuitbreaker/plugin_test.go (1)

238-238: Check error returns in test setup.

Multiple error returns are being ignored in the test setup code. While these might be expected to succeed, unchecked errors could mask test issues. Consider checking these errors to ensure test validity.

Also applies to: 245-245, 265-266, 303-303, 308-308

📜 Review details

Configuration used: CodeRabbit UI
Review profile: ASSERTIVE
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between c3b49c2 and 188c462.

📒 Files selected for processing (4)
  • plugins/circuitbreaker/README.md (1 hunks)
  • plugins/circuitbreaker/main.go (1 hunks)
  • plugins/circuitbreaker/plugin_test.go (1 hunks)
  • plugins/circuitbreaker/utils.go (1 hunks)
🧰 Additional context used
🧠 Learnings (5)
📓 Common learnings
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#84
File: transports/bifrost-http/main.go:2-2
Timestamp: 2025-06-15T16:05:13.489Z
Learning: For the Bifrost project, HTTP transport integration routers for new providers (like Mistral and Ollama) are implemented in separate PRs from the core provider support, following a focused PR strategy.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#54
File: core/schemas/provider.go:148-148
Timestamp: 2025-06-04T03:57:50.981Z
Learning: Breaking changes in the Bifrost codebase are managed by first merging and tagging core schema changes, then updating dependent code references in subsequent steps after the core version is released.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#103
File: .github/workflows/transport-dependency-update.yml:53-75
Timestamp: 2025-06-20T16:21:18.912Z
Learning: In the bifrost repository's transport dependency update workflow, when updating the core dependency to a new version using `go get`, the go.mod and go.sum files will always change in normal operation, making the safety check for changes more of a defensive programming practice rather than handling a common scenario.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#83
File: core/providers/mistral.go:168-170
Timestamp: 2025-06-15T14:24:49.882Z
Learning: In the Bifrost codebase, performance is prioritized over defensive copying for HTTP service operations. Specifically, shallow slice assignments in provider response handling are acceptable due to object pool reset patterns and JSON unmarshaling behavior that minimize practical data corruption risks.
plugins/circuitbreaker/plugin_test.go (5)
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/automatic_function_calling.go:22-22
Timestamp: 2025-06-16T04:55:11.886Z
Learning: In the Bifrost test suite (tests/core-providers), parallel tests using t.Parallel() are not being implemented currently. The team plans to add parallel test execution in future enhancements.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#79
File: core/bifrost.go:94-103
Timestamp: 2025-06-14T04:06:58.240Z
Learning: In core/bifrost.go, the count parameter in RunPostHooks method is intentionally kept separate from p.executedPreHooks to support circuit breaker plugins that may need to trigger PostHooks for only a subset of executed plugins when detecting failure conditions mid-execution.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/end_to_end_tool_calling.go:43-45
Timestamp: 2025-06-16T04:13:55.437Z
Learning: In the Bifrost codebase, errors returned from client methods like ChatCompletionRequest are of type BifrostError, not the standard error interface. For testing these errors, use require.Nilf instead of require.NoErrorf since BifrostError doesn't work with the standard error assertion methods.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/simple_chat.go:39-41
Timestamp: 2025-06-16T04:13:42.755Z
Learning: In the Bifrost codebase, errors returned from methods like ChatCompletionRequest are of type BifrostError (a custom error type) rather than the standard Go error interface. Therefore, require.Nilf should be used for error assertions instead of require.NoErrorf.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/complete_end_to_end.go:39-41
Timestamp: 2025-06-16T04:12:05.427Z
Learning: In the Bifrost system, error returns are of type `BifrostError` rather than the standard Go `error` interface. Therefore, use `require.Nilf(t, err, ...)` instead of `require.NoError(t, err)` when checking for errors in Bifrost function calls.
plugins/circuitbreaker/README.md (4)
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#79
File: core/bifrost.go:94-103
Timestamp: 2025-06-14T04:06:58.240Z
Learning: In core/bifrost.go, the count parameter in RunPostHooks method is intentionally kept separate from p.executedPreHooks to support circuit breaker plugins that may need to trigger PostHooks for only a subset of executed plugins when detecting failure conditions mid-execution.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#54
File: core/schemas/provider.go:148-148
Timestamp: 2025-06-04T03:57:50.981Z
Learning: Breaking changes in the Bifrost codebase are managed by first merging and tagging core schema changes, then updating dependent code references in subsequent steps after the core version is released.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#138
File: docs/usage/go-package/mcp.md:408-412
Timestamp: 2025-07-01T12:40:08.576Z
Learning: Pratham-Mishra04 is okay with keeping bullet list formatting that uses colons after dashes in markdown documentation, even if it triggers linter warnings, preferring functionality over strict formatting rules.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#83
File: core/providers/mistral.go:168-170
Timestamp: 2025-06-15T14:24:49.882Z
Learning: In the Bifrost codebase, performance is prioritized over defensive copying for HTTP service operations. Specifically, shallow slice assignments in provider response handling are acceptable due to object pool reset patterns and JSON unmarshaling behavior that minimize practical data corruption risks.
plugins/circuitbreaker/utils.go (1)
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#84
File: core/providers/ollama.go:59-61
Timestamp: 2025-06-15T14:34:29.401Z
Learning: The `CheckAndSetDefaults()` method on `*schemas.ProviderConfig` in Go does not return any error - it has a void return type and only sets default values on the configuration struct.
plugins/circuitbreaker/main.go (10)
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#79
File: core/bifrost.go:94-103
Timestamp: 2025-06-14T04:06:58.240Z
Learning: In core/bifrost.go, the count parameter in RunPostHooks method is intentionally kept separate from p.executedPreHooks to support circuit breaker plugins that may need to trigger PostHooks for only a subset of executed plugins when detecting failure conditions mid-execution.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/complete_end_to_end.go:39-41
Timestamp: 2025-06-16T04:12:05.427Z
Learning: In the Bifrost system, error returns are of type `BifrostError` rather than the standard Go `error` interface. Therefore, use `require.Nilf(t, err, ...)` instead of `require.NoError(t, err)` when checking for errors in Bifrost function calls.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/simple_chat.go:39-41
Timestamp: 2025-06-16T04:13:42.755Z
Learning: In the Bifrost codebase, errors returned from methods like ChatCompletionRequest are of type BifrostError (a custom error type) rather than the standard Go error interface. Therefore, require.Nilf should be used for error assertions instead of require.NoErrorf.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/end_to_end_tool_calling.go:43-45
Timestamp: 2025-06-16T04:13:55.437Z
Learning: In the Bifrost codebase, errors returned from client methods like ChatCompletionRequest are of type BifrostError, not the standard error interface. For testing these errors, use require.Nilf instead of require.NoErrorf since BifrostError doesn't work with the standard error assertion methods.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#94
File: core/bifrost.go:823-845
Timestamp: 2025-06-18T15:15:51.323Z
Learning: In the Bifrost project, the team prioritizes maintaining consistent error handling patterns over exposing detailed error context. All errors should be wrapped in the standard `BifrostError` structure rather than creating specific error types or exposing richer error details like exit codes or stderr output.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/utils.go:101-110
Timestamp: 2025-06-16T04:21:07.962Z
Learning: In the Bifrost codebase, when a variable is already available, it's acceptable to use `&variable` directly to get its pointer rather than always using `bifrost.Ptr(variable)`. The `bifrost.Ptr()` helper is primarily for taking pointers of literals or expressions, not existing variables.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#83
File: core/providers/mistral.go:168-170
Timestamp: 2025-06-15T14:24:49.882Z
Learning: In the Bifrost codebase, performance is prioritized over defensive copying for HTTP service operations. Specifically, shallow slice assignments in provider response handling are acceptable due to object pool reset patterns and JSON unmarshaling behavior that minimize practical data corruption risks.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#80
File: plugins/maxim/main.go:249-264
Timestamp: 2025-06-14T06:17:54.426Z
Learning: In the BifrostError struct, the Error field is a struct (not a pointer), so accessing bifrostErr.Error.Message, bifrostErr.Error.Code, and bifrostErr.Error.Type is safe without nil checks on the Error field itself. The Code and Type fields are of type *string.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/complete_end_to_end.go:57-62
Timestamp: 2025-06-16T04:14:25.015Z
Learning: In the Bifrost codebase, toolCalls[0].Function refers to a FunctionCall struct, and FunctionCall.Name is a pointer to string (*string) that requires dereferencing with the * operator to get the actual string value.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#135
File: docs/core-package.md:105-116
Timestamp: 2025-06-27T17:07:39.462Z
Learning: In Go, when importing a package, the identifier used to access it is determined by the `package` declaration in the Go source files, not the directory name. For the Bifrost project, the core directory files declare `package bifrost`, so importing `"github.com/maximhq/bifrost/core"` automatically makes it accessible as `bifrost.Init`, `bifrost.Ptr`, etc., without needing an explicit alias.
🪛 golangci-lint (1.64.8)
plugins/circuitbreaker/plugin_test.go

238-238: Error return value of cb.PreHook is not checked

(errcheck)


245-245: Error return value of cb.PostHook is not checked

(errcheck)


265-265: Error return value of cb.PreHook is not checked

(errcheck)


266-266: Error return value of cb.PostHook is not checked

(errcheck)


303-303: Error return value of cb.PreHook is not checked

(errcheck)


308-308: Error return value of cb.PostHook is not checked

(errcheck)

🪛 LanguageTool
plugins/circuitbreaker/README.md

[uncategorized] ~78-~78: A punctuation mark might be missing here.
Context: ...|-------|------|---------|-------------| | FailureRateThreshold | float64 | `...

(AI_EN_LECTOR_MISSING_PUNCTUATION)


[uncategorized] ~153-~153: You might be missing the article “the” here.
Context: ...ed through - Success/failure determines next state - Success → CLOSED (recovery comp...

(AI_EN_LECTOR_MISSING_DETERMINER_THE)

🪛 markdownlint-cli2 (0.17.2)
plugins/circuitbreaker/README.md

69-69: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


72-72: Multiple consecutive blank lines
Expected: 1; Actual: 2

(MD012, no-multiple-blanks)


92-92: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


93-93: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


99-99: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


100-100: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


140-140: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


141-141: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


145-145: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


146-146: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


151-151: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


152-152: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


185-185: Multiple consecutive blank lines
Expected: 1; Actual: 2

(MD012, no-multiple-blanks)

🔇 Additional comments (5)
plugins/circuitbreaker/utils.go (1)

188-202: Efficient memory management implementation.

The periodic cleanup strategy for the time-based sliding window is well-implemented. The conditional cleanup based on thresholds (line 198-201) addresses performance concerns for high-frequency calls effectively.

plugins/circuitbreaker/main.go (4)

188-204: Well-implemented plugin initialization with proper logging.

The plugin initialization correctly validates configuration, applies defaults, and uses the configured logger instead of fmt.Printf. This addresses previous review concerns effectively.


309-316: Excellent user-facing error messages.

The error messages provide clear, actionable information including:

  • Current circuit state and why it's in that state
  • Specific thresholds that were exceeded
  • Recovery time estimates
  • Suggestions to use alternative providers

This enhances the user experience during circuit breaker events.

Also applies to: 326-334


85-116: Consider making state manipulation functions private.

The functions ForceOpen, ForceClose, and Reset are exported but may not need to be part of the public API. If these are only used for testing, consider making them private or moving them to a test-specific helper.

Are these functions intended for use outside of testing scenarios? If they're for administrative operations or debugging, they should remain exported. Otherwise, consider making them private to reduce the API surface.


301-301: Excellent concurrent programming implementation.

The plugin demonstrates proper thread-safety with:

  • Atomic operations for state transitions and counters
  • Appropriate mutex usage for sliding window access
  • Lock-free reads for performance
  • Double-checked locking pattern in getOrCreateProviderState

This ensures safe concurrent access in high-performance scenarios.

Also applies to: 342-342, 381-384, 410-413, 456-457

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Actionable comments posted: 2

♻️ Duplicate comments (2)
plugins/circuitbreaker/README.md (2)

70-70: Fix markdown formatting - add blank lines around headings and lists.

Multiple sections are missing required blank lines between headings and their content.

 ### State Diagram of Circuit Breaker
+
 ![Circuit Breaker States](../../docs/media/plugins/circuit-breaker-states.png)
 #### Count-Based Sliding Window
+
 - **Type**: `"count-based"`
 #### Time-Based Sliding Window
+
 - **Type**: `"time-based"`
 ### CLOSED (Normal Operation)
+
 - Requests are sent to providers normally
 ### OPEN (Failure Protection)
+
 - All requests are immediately rejected
 ### HALF_OPEN (Recovery Testing)
+
 - Limited number of requests are allowed through

Also applies to: 93-94, 100-101, 162-163, 167-168, 173-174


175-175: Add missing article "the" for correct grammar.

-- Success/failure determines next state
+- Success/failure determines the next state
📜 Review details

Configuration used: CodeRabbit UI
Review profile: ASSERTIVE
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 188c462 and 9e1d376.

📒 Files selected for processing (3)
  • plugins/circuitbreaker/README.md (1 hunks)
  • plugins/circuitbreaker/main.go (1 hunks)
  • plugins/circuitbreaker/utils.go (1 hunks)
🧰 Additional context used
🧠 Learnings (3)
📓 Common learnings
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#84
File: transports/bifrost-http/main.go:2-2
Timestamp: 2025-06-15T16:05:13.489Z
Learning: For the Bifrost project, HTTP transport integration routers for new providers (like Mistral and Ollama) are implemented in separate PRs from the core provider support, following a focused PR strategy.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#54
File: core/schemas/provider.go:148-148
Timestamp: 2025-06-04T03:57:50.981Z
Learning: Breaking changes in the Bifrost codebase are managed by first merging and tagging core schema changes, then updating dependent code references in subsequent steps after the core version is released.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#103
File: .github/workflows/transport-dependency-update.yml:53-75
Timestamp: 2025-06-20T16:21:18.912Z
Learning: In the bifrost repository's transport dependency update workflow, when updating the core dependency to a new version using `go get`, the go.mod and go.sum files will always change in normal operation, making the safety check for changes more of a defensive programming practice rather than handling a common scenario.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#83
File: core/providers/mistral.go:168-170
Timestamp: 2025-06-15T14:24:49.882Z
Learning: In the Bifrost codebase, performance is prioritized over defensive copying for HTTP service operations. Specifically, shallow slice assignments in provider response handling are acceptable due to object pool reset patterns and JSON unmarshaling behavior that minimize practical data corruption risks.
plugins/circuitbreaker/README.md (4)
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#54
File: core/schemas/provider.go:148-148
Timestamp: 2025-06-04T03:57:50.981Z
Learning: Breaking changes in the Bifrost codebase are managed by first merging and tagging core schema changes, then updating dependent code references in subsequent steps after the core version is released.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#79
File: core/bifrost.go:94-103
Timestamp: 2025-06-14T04:06:58.240Z
Learning: In core/bifrost.go, the count parameter in RunPostHooks method is intentionally kept separate from p.executedPreHooks to support circuit breaker plugins that may need to trigger PostHooks for only a subset of executed plugins when detecting failure conditions mid-execution.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#138
File: docs/usage/go-package/mcp.md:408-412
Timestamp: 2025-07-01T12:40:08.576Z
Learning: Pratham-Mishra04 is okay with keeping bullet list formatting that uses colons after dashes in markdown documentation, even if it triggers linter warnings, preferring functionality over strict formatting rules.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#83
File: core/providers/mistral.go:168-170
Timestamp: 2025-06-15T14:24:49.882Z
Learning: In the Bifrost codebase, performance is prioritized over defensive copying for HTTP service operations. Specifically, shallow slice assignments in provider response handling are acceptable due to object pool reset patterns and JSON unmarshaling behavior that minimize practical data corruption risks.
plugins/circuitbreaker/main.go (10)
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#79
File: core/bifrost.go:94-103
Timestamp: 2025-06-14T04:06:58.240Z
Learning: In core/bifrost.go, the count parameter in RunPostHooks method is intentionally kept separate from p.executedPreHooks to support circuit breaker plugins that may need to trigger PostHooks for only a subset of executed plugins when detecting failure conditions mid-execution.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/complete_end_to_end.go:39-41
Timestamp: 2025-06-16T04:12:05.427Z
Learning: In the Bifrost system, error returns are of type `BifrostError` rather than the standard Go `error` interface. Therefore, use `require.Nilf(t, err, ...)` instead of `require.NoError(t, err)` when checking for errors in Bifrost function calls.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/simple_chat.go:39-41
Timestamp: 2025-06-16T04:13:42.755Z
Learning: In the Bifrost codebase, errors returned from methods like ChatCompletionRequest are of type BifrostError (a custom error type) rather than the standard Go error interface. Therefore, require.Nilf should be used for error assertions instead of require.NoErrorf.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/end_to_end_tool_calling.go:43-45
Timestamp: 2025-06-16T04:13:55.437Z
Learning: In the Bifrost codebase, errors returned from client methods like ChatCompletionRequest are of type BifrostError, not the standard error interface. For testing these errors, use require.Nilf instead of require.NoErrorf since BifrostError doesn't work with the standard error assertion methods.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#94
File: core/bifrost.go:823-845
Timestamp: 2025-06-18T15:15:51.323Z
Learning: In the Bifrost project, the team prioritizes maintaining consistent error handling patterns over exposing detailed error context. All errors should be wrapped in the standard `BifrostError` structure rather than creating specific error types or exposing richer error details like exit codes or stderr output.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/utils.go:101-110
Timestamp: 2025-06-16T04:21:07.962Z
Learning: In the Bifrost codebase, when a variable is already available, it's acceptable to use `&variable` directly to get its pointer rather than always using `bifrost.Ptr(variable)`. The `bifrost.Ptr()` helper is primarily for taking pointers of literals or expressions, not existing variables.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#83
File: core/providers/mistral.go:168-170
Timestamp: 2025-06-15T14:24:49.882Z
Learning: In the Bifrost codebase, performance is prioritized over defensive copying for HTTP service operations. Specifically, shallow slice assignments in provider response handling are acceptable due to object pool reset patterns and JSON unmarshaling behavior that minimize practical data corruption risks.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#80
File: plugins/maxim/main.go:249-264
Timestamp: 2025-06-14T06:17:54.426Z
Learning: In the BifrostError struct, the Error field is a struct (not a pointer), so accessing bifrostErr.Error.Message, bifrostErr.Error.Code, and bifrostErr.Error.Type is safe without nil checks on the Error field itself. The Code and Type fields are of type *string.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#81
File: tests/core-providers/scenarios/complete_end_to_end.go:57-62
Timestamp: 2025-06-16T04:14:25.015Z
Learning: In the Bifrost codebase, toolCalls[0].Function refers to a FunctionCall struct, and FunctionCall.Name is a pointer to string (*string) that requires dereferencing with the * operator to get the actual string value.
Learnt from: Pratham-Mishra04
PR: maximhq/bifrost#135
File: docs/core-package.md:105-116
Timestamp: 2025-06-27T17:07:39.462Z
Learning: In Go, when importing a package, the identifier used to access it is determined by the `package` declaration in the Go source files, not the directory name. For the Bifrost project, the core directory files declare `package bifrost`, so importing `"github.com/maximhq/bifrost/core"` automatically makes it accessible as `bifrost.Init`, `bifrost.Ptr`, etc., without needing an explicit alias.
🪛 LanguageTool
plugins/circuitbreaker/README.md

[uncategorized] ~78-~78: A punctuation mark might be missing here.
Context: ...|-------|------|---------|-------------| | FailureRateThreshold | float64 | `...

(AI_EN_LECTOR_MISSING_PUNCTUATION)


[uncategorized] ~175-~175: You might be missing the article “the” here.
Context: ...ed through - Success/failure determines next state - Success → CLOSED (recovery comp...

(AI_EN_LECTOR_MISSING_DETERMINER_THE)


[duplication] ~182-~182: Possible typo: you repeated a word.
Context: ...failures that contribute to the failure rate - Rate Limit Errors (429): Considered failur...

(ENGLISH_WORD_REPEAT_RULE)


[uncategorized] ~186-~186: If this is a compound adjective that modifies the following noun, use a hyphen.
Context: ...rors) This classification ensures that rate limiting issues and server-side problems trigger...

(EN_COMPOUND_ADJECTIVE_INTERNAL)


[style] ~220-~220: ‘emergency situations’ might be wordy. Consider a shorter alternative.
Context: ...anual control functions for testing and emergency situations: ```go // Force the circuit to open st...

(EN_WORDINESS_PREMIUM_EMERGENCY_SITUATIONS)


[style] ~242-~242: ‘emergency situations’ might be wordy. Consider a shorter alternative.
Context: ... sparingly and primarily for testing or emergency situations. The automatic circuit breaker logic is...

(EN_WORDINESS_PREMIUM_EMERGENCY_SITUATIONS)

🪛 markdownlint-cli2 (0.17.2)
plugins/circuitbreaker/README.md

70-70: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


93-93: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


94-94: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


100-100: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


101-101: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


162-162: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


163-163: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


167-167: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


168-168: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


173-173: Headings should be surrounded by blank lines
Expected: 1; Actual: 0; Below

(MD022, blanks-around-headings)


174-174: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)


182-182: Lists should be surrounded by blank lines

(MD032, blanks-around-lists)

🔇 Additional comments (3)
plugins/circuitbreaker/README.md (1)

1-261: Excellent documentation coverage!

The README provides comprehensive documentation for the circuit breaker plugin with clear explanations of states, configuration options, usage examples, and best practices. The state diagram reference and code examples will be very helpful for users.

plugins/circuitbreaker/utils.go (1)

195-232: Great improvement to the time-based sliding window performance!

The periodic cleanup implementation effectively addresses the performance concern from the previous review. The multi-condition trigger (max calls threshold, time-based check, and accumulation limit) provides a good balance between memory efficiency and performance.

plugins/circuitbreaker/main.go (1)

1-520: Excellent circuit breaker implementation with robust state management!

The plugin demonstrates high-quality engineering:

  • Thread-safe operations using atomic variables and proper mutex usage
  • Clear state machine implementation with well-defined transitions
  • Comprehensive error messages that guide users to solutions
  • Proper use of the configured logger throughout
  • Good separation of concerns between state evaluation and transition logic

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2 participants