WIP

sentry-ruby/lib/sentry/envelope.rb

@@ -19,10 +19,7 @@ def type
       end
 
       def to_s
-        <<~ITEM
-          #{JSON.generate(@headers)}
-          #{JSON.generate(@payload)}
-        ITEM
+        [JSON.generate(@headers), JSON.generate(@payload)].join("\n")
       end
 
       def serialize

sentry-ruby/lib/sentry/hub.rb

@@ -90,6 +90,10 @@ def start_transaction(transaction: nil, custom_sampling_context: {}, instrumente
       sampling_context.merge!(custom_sampling_context)
 
       transaction.set_initial_sample_decision(sampling_context: sampling_context)
+
+      #TODO-neel profiles sample
+      transaction.profiler.start
+
       transaction
     end
 

sentry-ruby/lib/sentry/profiler.rb

@@ -0,0 +1,87 @@
+# frozen_string_literal: true
+
+require "etc"
+require "stackprof"
+require "securerandom"
+
+module Sentry
+  class Profiler
+
+    VERSION = "1"
+    PLATFORM = "ruby"
+    # 101 Hz in microseconds
+    DEFAULT_INTERVAL = 1e6 / 101
+
+    def initialize
+      @event_id = SecureRandom.uuid.delete("-")
+    end
+
+    def start
+      # TODO-neel profiler args
+      StackProf.start(interval: DEFAULT_INTERVAL, raw: true, aggregate: false)
+    end
+
+    def stop
+      StackProf.stop
+    end
+
+    def to_hash
+      return nil unless Sentry.initialized?
+
+      results = StackProf.results
+      return nil unless results
+      return nil if results.empty?
+
+      report = StackProf::Report.new(results)
+      frame_map = {}
+
+      frames = report.frames.to_enum.with_index.map do |frame, idx|
+        frame_id, frame_data = frame
+
+        # need to map over stackprof frame ids to ours
+        frame_map[frame_id] = idx
+
+        # TODO-neel module, filename
+        {
+          abs_path: frame_data[:file],
+          function: frame_data[:name],
+          lineno: frame_data[:line]
+        }
+      end
+
+      raw_stacks, * = report.flamegraph_stacks(results[:raw])
+
+      # map over frame ids
+      # reverse each stack since perl flamegraph is reverse order
+      # TODO-neel compact ok??
+      stacks = raw_stacks.map { |stack| stack.reverse.map { |id| frame_map[id] }.compact }
+
+      # stacks are all unique so stack ids are just 0...len
+      elapsed_since_start_ns = 0
+
+      samples = stacks.size.times.map do |stack_id|
+        # stackprof deltas are in microseconds
+        elapsed_since_start_ns += (results[:raw_timestamp_deltas][stack_id] * 1e3).to_i
+
+        {
+          stack_id: stack_id,
+          thread_id: '42', # TODO-neel not available???
+          elapsed_since_start_ns: elapsed_since_start_ns
+        }
+      end
+
+      profile = {
+        frames: frames,
+        stacks: stacks,
+        samples: samples
+      }
+
+      {
+        event_id: @event_id,
+        platform: PLATFORM,
+        version: VERSION,
+        profile: profile
+      }
+    end
+  end
+end

sentry-ruby/lib/sentry/scope.rb

@@ -309,7 +309,8 @@ def os_context
               name: uname[:sysname] || RbConfig::CONFIG["host_os"],
               version: uname[:version],
               build: uname[:release],
-              kernel_version: uname[:version]
+              kernel_version: uname[:version],
+              machine: uname[:machine]
             }
           end
       end

sentry-ruby/lib/sentry/transaction.rb

@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require "sentry/baggage"
+require "sentry/profiler"
 
 module Sentry
   class Transaction < Span
@@ -83,6 +84,7 @@ def initialize(
       @effective_sample_rate = nil
       @contexts = {}
       @measurements = {}
+      @profiler = nil
       init_span_recorder
     end
 
@@ -254,6 +256,9 @@ def finish(hub: nil, end_timestamp: nil)
         @name = UNLABELD_NAME
       end
 
+      # TODO-neel profiles sample
+      @profiler&.stop
+
       if @sampled
         event = hub.current_client.event_from_transaction(self)
         hub.capture_event(event)
@@ -288,6 +293,12 @@ def set_context(key, value)
       @contexts[key] = value
     end
 
+    # The stackprof profiler instance
+    # @return [Profiler]
+    def profiler
+      @profiler ||= Profiler.new
+    end
+
     protected
 
     def init_span_recorder(limit = 1000)

sentry-ruby/lib/sentry/transaction_event.rb

@@ -17,6 +17,9 @@ class TransactionEvent < Event
     # @return [Float, nil]
     attr_reader :start_timestamp
 
+    # @return [Hash, nil]
+    attr_accessor :profile
+
     def initialize(transaction:, **options)
       super(**options)
 
@@ -32,6 +35,9 @@ def initialize(transaction:, **options)
 
       finished_spans = transaction.span_recorder.spans.select { |span| span.timestamp && span != transaction }
       self.spans = finished_spans.map(&:to_hash)
+
+      # TODO-neel profiler cleanup
+      self.profile = populate_profile(transaction)
     end
 
     # Sets the event's start_timestamp.
@@ -49,5 +55,26 @@ def to_hash
       data[:measurements] = @measurements
       data
     end
+
+    private
+
+    def populate_profile(transaction)
+      return nil unless transaction.profiler
+
+      transaction.profiler.to_hash.merge(
+        environment: environment,
+        release: release,
+        timestamp: Time.at(start_timestamp).iso8601,
+        device: { architecture: Scope.os_context[:machine] },
+        os: { name: Scope.os_context[:name], version: Scope.os_context[:version] },
+        runtime: Scope.runtime_context,
+        transaction: {
+          id: event_id,
+          name: transaction.name,
+          trace_id: transaction.trace_id,
+          active_thead_id: '42' # TODO-neel
+        }
+      )
+    end
   end
 end

sentry-ruby/lib/sentry/transport.rb

@@ -61,6 +61,7 @@ def send_envelope(envelope)
 
       if data
         log_info("[Transport] Sending envelope with items [#{serialized_items.map(&:type).join(', ')}] #{envelope.event_id} to Sentry")
+        File.open('/tmp/dump', 'w') { |file| file.write(data) } if envelope.items.map(&:type).include?('profile')
         send_data(data)
       end
     end
@@ -154,6 +155,13 @@ def envelope_from_event(event)
         event_payload
       )
 
+      if event.is_a?(TransactionEvent) && event.profile
+        envelope.add_item(
+          { type: 'profile', content_type: 'application/json' },
+          event.profile
+        )
+      end
+
       client_report_headers, client_report_payload = fetch_pending_client_report
       envelope.add_item(client_report_headers, client_report_payload) if client_report_headers
 

sentry-ruby/sentry-ruby.gemspec

@@ -21,4 +21,5 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency "concurrent-ruby", '~> 1.0', '>= 1.0.2'
+  spec.add_dependency "stackprof", '~> 0.2.23'
 end