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Global rate limit infra components (#723)
* Global rate limit components * `RateLimitInfraIR` - holds the config to manage the ratelimit service. * `global-ratelimit` runner that subscribes to `XdsIR` messages and translates it to `RateLimitInfraIR`. * enhance the `infrastructure` runner to subscribe to `RateLimitInfraIR` messages and translate it into platform specific ratelimit resources. Relates to #670 Signed-off-by: Arko Dasgupta <arko@tetrate.io>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| // Copyright Envoy Gateway Authors | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
| // The full text of the Apache license is available in the LICENSE file at | ||
| // the root of the repo. | ||
|
|
||
| package runner | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
|
|
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| "github.com/envoyproxy/gateway/internal/envoygateway/config" | ||
| "github.com/envoyproxy/gateway/internal/ir" | ||
| "github.com/envoyproxy/gateway/internal/message" | ||
| "github.com/envoyproxy/gateway/internal/xds/translator" | ||
| ) | ||
|
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| type Config struct { | ||
| config.Server | ||
| XdsIR *message.XdsIR | ||
| RateLimitInfraIR *message.RateLimitInfraIR | ||
| } | ||
|
|
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| type Runner struct { | ||
| Config | ||
| } | ||
|
|
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| func (r *Runner) Name() string { | ||
| return "global-ratelimit" | ||
| } | ||
|
|
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| func New(cfg *Config) *Runner { | ||
| return &Runner{Config: *cfg} | ||
| } | ||
|
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| // Start starts the infrastructure runner | ||
| func (r *Runner) Start(ctx context.Context) error { | ||
| r.Logger = r.Logger.WithValues("runner", r.Name()) | ||
| go r.subscribeAndTranslate(ctx) | ||
| r.Logger.Info("started") | ||
| return nil | ||
| } | ||
|
|
||
| func (r *Runner) subscribeAndTranslate(ctx context.Context) { | ||
| // Subscribe | ||
| xdsIRCh := r.XdsIR.Subscribe(ctx) | ||
| for ctx.Err() == nil { | ||
| var xdsIRs []*ir.Xds | ||
| snapshot := <-xdsIRCh | ||
| r.Logger.Info("received a notification") | ||
| for _, value := range snapshot.State { | ||
| xdsIRs = append(xdsIRs, value) | ||
| } | ||
| // Translate to ratelimit infra IR | ||
| result, err := r.translate(xdsIRs) | ||
| if err != nil { | ||
| r.Logger.Error(err, "failed to translate xds ir") | ||
| } else { | ||
| if result == nil { | ||
| r.RateLimitInfraIR.Delete(r.Name()) | ||
| } else { | ||
| // Publish ratelimit infra IR | ||
| r.RateLimitInfraIR.Store(r.Name(), result) | ||
| } | ||
| } | ||
| } | ||
| r.Logger.Info("subscriber shutting down") | ||
| } | ||
|
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| func (r *Runner) translate(xdsIRs []*ir.Xds) (*ir.RateLimitInfra, error) { | ||
| rlInfra := new(ir.RateLimitInfra) | ||
|
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| // Return empty IR if ratelimit has not been enabled yet in the EnvoyGateway API | ||
| if r.EnvoyGateway.RateLimit == nil { | ||
| return nil, nil | ||
| } | ||
|
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| for _, xdsIR := range xdsIRs { | ||
| for _, listener := range xdsIR.HTTP { | ||
| config := translator.BuildRateLimitServiceConfig(listener) | ||
| if config != nil { | ||
| str, err := translator.GetRateLimitServiceConfigStr(config) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to get rate limit config string: %w", err) | ||
| } | ||
| c := &ir.RateLimitServiceConfig{ | ||
| Name: listener.Name, | ||
| Config: str, | ||
| } | ||
| rlInfra.Configs = append(rlInfra.Configs, c) | ||
| } | ||
| } | ||
| } | ||
|
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| rlInfra.Backend = &ir.RateLimitDBBackend{ | ||
| Redis: &ir.RateLimitRedis{ | ||
| URL: r.EnvoyGateway.RateLimit.Backend.Redis.URL, | ||
| }, | ||
| } | ||
|
|
||
| return rlInfra, nil | ||
| } |
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