Class: Smplkit::Audit::EventBuffer

Inherits:
Object
  • Object
show all
Defined in:
lib/smplkit/audit/buffer.rb

Overview

Bounded in-memory queue + worker thread for fire-and-forget audit emits (ADR-047 §2.6).

#enqueue returns immediately. The worker drains on either a periodic tick or once depth crosses the high-water mark, retries transient failures with exponential backoff, drops permanent 4xx (other than 429), and evicts the oldest item under sustained back-pressure.

Constant Summary collapse

MAX_BUFFER_SIZE = 
1000
WATERMARK = 
50
FLUSH_INTERVAL = 
5.0
MAX_ATTEMPTS = 
5
INITIAL_BACKOFF = 
0.25
MAX_BACKOFF = 
8.0

Instance Method Summary collapse

Constructor Details

#initialize(api) ⇒ EventBuffer

Returns a new instance of EventBuffer.



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# File 'lib/smplkit/audit/buffer.rb', line 21

def initialize(api)
  @api = api
  @queue = []
  @mutex = Mutex.new
  @cond = ConditionVariable.new
  @closed = false
  @dropped_count = 0
  # +@in_flight+ is the number of items the worker has shifted off
  # the queue but not yet finished POSTing. +#flush+ must wait on
  # both queue empty AND in_flight == 0 — otherwise it can return
  # while a just-shifted item is still in the middle of its HTTP
  # round-trip, and an immediately following +list+ call would
  # miss the event.
  @in_flight = 0
  @worker = Thread.new { run }
  @worker.report_on_exception = false
end

Instance Method Details

#close(timeout: 5.0) ⇒ Object 



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# File 'lib/smplkit/audit/buffer.rb', line 71

def close(timeout: 5.0)
  flush(timeout: timeout)
  @mutex.synchronize do
    @closed = true
    @cond.broadcast
  end
  @worker.join(timeout)
end

#enqueue(body, idempotency_key) ⇒ Object 



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# File 'lib/smplkit/audit/buffer.rb', line 39

def enqueue(body, idempotency_key)
  depth = nil
  @mutex.synchronize do
    return if @closed

    if @queue.size >= MAX_BUFFER_SIZE
      @queue.shift
      @dropped_count += 1
      warn "[smplkit.audit] buffer full (size=#{MAX_BUFFER_SIZE}); " \
           "dropped oldest event (total dropped=#{@dropped_count})"
    end
    @queue.push(PendingEvent.new(body, idempotency_key))
    depth = @queue.size
    @cond.signal if depth >= WATERMARK
  end
end

#flush(timeout: 5.0) ⇒ Object 



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# File 'lib/smplkit/audit/buffer.rb', line 56

def flush(timeout: 5.0)
  deadline = monotonic_now + timeout
  loop do
    idle = @mutex.synchronize { @queue.empty? && @in_flight.zero? }
    return if idle

    if monotonic_now >= deadline
      warn "[smplkit.audit] flush timed out (timeout=#{timeout}s)"
      return
    end
    @mutex.synchronize { @cond.signal }
    sleep 0.05
  end
end