Module: OpenTrace::PayloadBuilder

Defined in:
lib/opentrace/payload_builder.rb

Overview

Materializes deferred log entries (frozen Arrays) into payload Hashes. All heavy work (context merge, timestamp formatting, Hash building) runs on the background dispatch thread, keeping the request thread fast.

Class Method Summary collapse

Class Method Details

.build_request_summary(collector, summary, controller, action, method, path, status, duration_ms) ⇒ Object 



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# File 'lib/opentrace/payload_builder.rb', line 184

def build_request_summary(collector, summary, controller, action, method, path, status, duration_ms)
  rs = {
    controller: controller,
    action: action,
    method: method,
    path: path,
    status: status,
    duration_ms: duration_ms.round(1),
    sql_count: summary[:sql_query_count],
    sql_total_ms: summary[:sql_total_ms],
    sql_slowest_ms: summary[:sql_slowest_ms],
    sql_slowest_name: summary[:sql_slowest_name],
    n_plus_one: summary[:n_plus_one_warning] || false,
    view_count: summary[:view_render_count],
    view_total_ms: summary[:view_total_ms],
    view_slowest_ms: summary[:view_slowest_ms],
    view_slowest_template: summary[:view_slowest_template],
    cache_reads: summary[:cache_reads],
    cache_hits: summary[:cache_hits],
    cache_writes: summary[:cache_writes],
    cache_hit_ratio: summary[:cache_hit_ratio],
    http_external_count: summary[:http_external_count],
    http_external_total_ms: summary[:http_external_total_ms],
    http_slowest_ms: summary[:http_slowest_ms],
    http_slowest_host: summary[:http_slowest_host],
    memory_before_mb: summary[:memory_before_mb],
    memory_after_mb: summary[:memory_after_mb],
    memory_delta_mb: summary[:memory_delta_mb],
    timeline: summary[:timeline]
  }.compact

  # Compute time breakdown
  if duration_ms > 0
    sql_pct = [((collector.sql_total_ms / duration_ms) * 100).round(1), 100.0].min
    view_pct = [((collector.view_total_ms / duration_ms) * 100).round(1), 100.0].min
    http_pct = collector.http_count > 0 ? [((collector.http_total_ms / duration_ms) * 100).round(1), 100.0].min : 0.0
    other_pct = [100 - sql_pct - view_pct - http_pct, 0].max.round(1)
    rs[:time_breakdown] = {
      sql_pct: sql_pct,
      view_pct: view_pct,
      http_pct: http_pct,
      other_pct: other_pct
    }
  end

  rs
end

.clean_backtrace(backtrace) ⇒ Object 



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# File 'lib/opentrace/payload_builder.rb', line 146

def clean_backtrace(backtrace)
  if defined?(::Rails) && ::Rails.respond_to?(:backtrace_cleaner)
    ::Rails.backtrace_cleaner.clean(backtrace)
  else
    backtrace.reject { |line| line.include?("/gems/") }
  end
end

.format_timestamp(ts) ⇒ Object 



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# File 'lib/opentrace/payload_builder.rb', line 135

def format_timestamp(ts)
  case ts
  when Float
    Time.at(ts).utc.strftime("%Y-%m-%dT%H:%M:%S.%6NZ")
  when Time
    ts.utc.strftime("%Y-%m-%dT%H:%M:%S.%6NZ")
  else
    Time.now.utc.strftime("%Y-%m-%dT%H:%M:%S.%6NZ")
  end
end

.materialize(entry, config) ⇒ Object 



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# File 'lib/opentrace/payload_builder.rb', line 10

def materialize(entry, config)
  if entry.is_a?(Array)
    entry[0] == :request ? materialize_request(entry, config) : materialize_log(entry, config)
  elsif entry.is_a?(Hash)
    entry # legacy direct payload
  end
rescue StandardError
  nil
end

.materialize_log(entry, config) ⇒ Object 



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# File 'lib/opentrace/payload_builder.rb', line 20

def materialize_log(entry, config)
  ts, level, message, metadata, ctx, request_id, trace_id,
    span_id, parent_span_id, req_summary, event_type = entry

  meta = ctx.is_a?(Hash) ? ctx.dup : {}
  meta.merge!(metadata) if metadata.is_a?(Hash)

  static_ctx = OpenTrace.send(:static_context)
  static_ctx.each { |k, v| meta[k] ||= v }
  meta[:request_id] ||= request_id if request_id

  # Extract trace_id from metadata if user provided it there
  meta_trace_id = meta.delete(:trace_id)
  effective_trace_id = meta_trace_id || trace_id

  payload = {
    timestamp: format_timestamp(ts),
    level: level.to_s.upcase,
    service: config.service,
    environment: config.environment,
    message: message.to_s,
    metadata: meta.compact
  }

  payload[:event_type] = event_type.to_s if event_type
  payload[:trace_id] = effective_trace_id.to_s if effective_trace_id
  payload[:span_id] = span_id if span_id
  payload[:parent_span_id] = parent_span_id if parent_span_id
  payload[:request_summary] = req_summary if req_summary
  payload
end

.materialize_request(entry, config) ⇒ Object 



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# File 'lib/opentrace/payload_builder.rb', line 52

def materialize_request(entry, config)
  _, started, finished, controller, action, method, path, status,
    exc_class, exc_message, exc_backtrace, request_id, trace_id,
    span_id, parent_span_id, cached_ctx, collector, extra = entry

  duration_ms = (finished && started) ? (finished - started) * 1000.0 : 0.0

  meta = cached_ctx.is_a?(Hash) ? cached_ctx.dup : {}
  meta.merge!(extra) if extra.is_a?(Hash)

  static_ctx = OpenTrace.send(:static_context)
  static_ctx.each { |k, v| meta[k] ||= v }
  meta[:request_id] ||= request_id if request_id

  if cached_ctx.is_a?(Hash) && cached_ctx.key?(:user_id)
    meta[:user_id] = cached_ctx[:user_id]
  end

  if exc_class
    meta[:exception_class] = exc_class
    meta[:exception_message] = exc_message&.slice(0, 500)
    if exc_backtrace
      cleaned = clean_backtrace(exc_backtrace)
      meta[:backtrace] = cleaned.first(15)
      meta[:error_fingerprint] = OpenTrace.send(:compute_error_fingerprint, exc_class, cleaned)
    end
  end

  # Run deferred EXPLAIN on background thread
  if extra.is_a?(Hash) && extra[:pending_explains] && defined?(ActiveRecord::Base)
    explain_results = run_pending_explains(extra.delete(:pending_explains))
    meta[:explain_plans] = explain_results unless explain_results.empty?
  end

  # Build request_summary from collector
  request_summary = nil
  if collector
    summary = collector.summary
    request_summary = build_request_summary(collector, summary, controller, action, method, path, status, duration_ms)
  else
    # No collector — include request identity in metadata
    meta[:controller] = controller
    meta[:action] = action
    meta[:method] = method
    meta[:path] = path
    meta[:status] = status
    meta[:duration_ms] = duration_ms.round(1)
  end

  level = if exc_class
            "ERROR"
          elsif status.to_i >= 500
            "ERROR"
          elsif status.to_i >= 400
            "WARN"
          else
            "INFO"
          end

  # Use custom transaction name if set
  transaction_name = meta.delete(:transaction_name)
  message = if transaction_name
              "#{transaction_name} #{status} #{duration_ms.round(1)}ms"
            else
              "#{method} #{path} #{status} #{duration_ms.round(1)}ms"
            end
  meta[:transaction_name] = transaction_name if transaction_name

  payload = {
    timestamp: format_timestamp(started),
    level: level,
    service: config.service,
    environment: config.environment,
    message: message,
    metadata: meta.compact
  }
  payload[:trace_id] = trace_id.to_s if trace_id
  payload[:span_id] = span_id if span_id
  payload[:parent_span_id] = parent_span_id if parent_span_id
  payload[:request_summary] = request_summary if request_summary
  payload
end

.run_explain(sql) ⇒ Object 



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# File 'lib/opentrace/payload_builder.rb', line 169

def run_explain(sql)
  # Only EXPLAIN simple SELECTs — reject anything suspicious
  normalized = sql.to_s.strip
  return nil unless normalized.match?(/\ASELECT\b/i)
  return nil if normalized.include?(";") # No multi-statement

  ActiveRecord::Base.connection_pool.with_connection do |conn|
    result = conn.execute("EXPLAIN #{normalized}")
    rows = result.respond_to?(:rows) ? result.rows : result.map(&:values)
    rows.flatten.join("\n").slice(0, 2000)
  end
rescue StandardError
  nil
end

.run_pending_explains(pending) ⇒ Object 



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# File 'lib/opentrace/payload_builder.rb', line 154

def run_pending_explains(pending)
  pending.filter_map do |entry|
    plan = run_explain(entry[:sql])
    next unless plan
    {
      sql: entry[:sql].to_s.slice(0, 500),
      duration_ms: entry[:duration_ms],
      name: entry[:name],
      explain_plan: plan
    }
  end
rescue StandardError
  []
end