Module: Bitfab::Replay

Defined in:
lib/bitfab/replay.rb

Overview

Replay historical traces through a traced method and create a test run.

Constant Summary collapse

CODE_CHANGE_UNSET = 
Object.new.freeze
PERSISTENCE_TIMEOUT_SECONDS = 
30.0
PERSISTENCE_POLL_SECONDS = 
0.1
TRUNK_CANDIDATES =

Read the code-change payload the replay wrapper captured and pointed us at via BITFAB_CODE_CHANGE_PATH. Returns [description, files] or nil. Best-effort: any error (no env var, missing file, bad JSON) yields nil so the replay proceeds with no code change rather than raising.

["origin/HEAD", "origin/main", "origin/master", "main", "master"].freeze
CC_MAX_FILES = 
60
CC_MAX_FILE_BYTES = 
500_000
CC_MAX_TOTAL_BYTES = 
2_000_000

Class Method Summary collapse

Class Method Details

.build_mock_tree(root) ⇒ Object

Walk the children of a root span tree node depth-first and build a lookup keyed by "#trace_function_key:#span_name:#call_index".

The root node itself is excluded: at replay time the runtime root span never queries the mock tree.

The compound (key, name) match disambiguates same-key spans that come from the fluent client.get_function(key).wrap(...) pattern: every wrapped method shares trace_function_key but differs in span_name. The counter is per-(key, name) pair so repeated same-name calls (including recursion) still order by occurrence. Mirrors the Python and TypeScript SDKs after HVT-2078: keying by trace_function_key alone caused the wrong historical output for fluent-API span sets.



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# File 'lib/bitfab/replay.rb', line 964

def build_mock_tree(root)
  spans = {}
  counters = {}

  walk = lambda do |node|
    key = node["traceFunctionKey"]
    if key && !key.empty?
      name = node["spanName"]
      name = key if name.nil? || name.empty?
      counter_key = "#{key}:#{name}"
      index = counters[counter_key] || 0
      counters[counter_key] = index + 1
      # externalSpanId is what the lazy path fetches the recorded output by
      # when the tree came back payload-free (includeOutputs=false). output
      # / outputMeta are copied ONLY when the node actually carries them, so
      # the presence of the :output key distinguishes an inline nil output
      # from a payload-free entry (mirrors TS's undefined-vs-null check).
      entry = {
        source_span_id: node["sourceSpanId"],
        external_span_id: node["externalSpanId"]
      }
      entry[:output] = node["output"] if node.key?("output")
      entry[:output_meta] = node["outputMeta"] if node.key?("outputMeta")
      spans["#{counter_key}:#{index}"] = entry
    end
    (node["children"] || []).each { |child| walk.call(child) }
  end

  (root["children"] || []).each { |child| walk.call(child) }

  spans
end

.build_span_output_fetcher(http_client) ⇒ Object

Build a memoized lazy fetcher for a single replay item. The returned lambda takes an externalSpanId and returns that span's deserialized recorded output, fetching it via get_external_span at most once per id (a span read twice - as a base "marked" mock and via an override's get_original_output - fetches once). The cache is per item: each item replays synchronously on its own thread, so no lock is needed.



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# File 'lib/bitfab/replay.rb', line 1003

def build_span_output_fetcher(http_client)
  cache = {}
  lambda do |external_span_id|
    return cache[external_span_id] if cache.key?(external_span_id)

    span = http_client.get_external_span(external_span_id, replay_view: true)
    span_data = (span["rawData"] || {})["span_data"] || {}
    # Prefer the Ruby Marshal payload (output_serialized) written by this
    # SDK; fall back to another SDK's output_meta, then the raw JSON output.
    meta = span_data["output_serialized"]
    meta = span_data["output_meta"] if meta.nil? || meta == ""
    cache[external_span_id] = Serialize.deserialize_output(span_data["output"], meta)
  end
end

.capture_code_change_from_git(cwd, label = nil) ⇒ Object 



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# File 'lib/bitfab/replay.rb', line 563

def capture_code_change_from_git(cwd, label = nil)
  root = git(cwd, ["rev-parse", "--show-toplevel"])
  return nil if root.nil? || root.strip.empty?

  root = root.strip
  resolved = cc_resolve_base(root)
  return nil if resolved.nil?

  base, from_trunk = resolved

  tracked = git(root, ["diff", "--name-status", "--no-renames", "-z", base, "--", ":!.bitfab"]) || ""
  untracked = git(root, ["ls-files", "--others", "--exclude-standard", "-z", "--", ":!.bitfab"]) || ""

  entries = cc_parse_name_status_z(tracked)
  untracked.split("\0").reject(&:empty?).each { |p| entries << ["A", p] }
  return nil if entries.empty?

  files = []
  total = 0
  entries.each do |status, path|
    break if files.length >= CC_MAX_FILES

    # Skip oversized files by size BEFORE reading their full contents, so a
    # huge changed file can't OOM/stall replay just to be discarded.
    before_bytes = (status == "A") ? 0 : cc_blob_bytes(root, base, path)
    after_bytes = (status == "D") ? 0 : cc_working_bytes(root, path)
    next if before_bytes > CC_MAX_FILE_BYTES || after_bytes > CC_MAX_FILE_BYTES

    # Normalize CRLF -> LF on both sides: git's blob is already LF-normalized
    # (autocrlf clean), so a raw CRLF working file would otherwise skew every
    # line as changed. Comparing/storing LF keeps the diff meaningful.
    before = (status == "A") ? "" : (git(root, ["show", "#{base}:#{path}"]) || "").gsub("\r\n", "\n")
    after = (status == "D") ? "" : cc_read_working_file(root, path).gsub("\r\n", "\n")
    next if before == after

    size = before.bytesize + after.bytesize
    next if total + size > CC_MAX_TOTAL_BYTES ||
      cc_looks_binary?(before) || cc_looks_binary?(after)

    total += size
    files << {"path" => path, "before" => before, "after" => after}
  end
  return nil if files.empty?

  subject = git(root, ["log", "-1", "--format=%s", "HEAD"])
  subject = subject ? subject.strip : ""
  head = ((label && !label.strip.empty?) ? label.strip : nil) || (subject.empty? ? nil : subject) || "Working-tree change"
  word = (files.length == 1) ? "file" : "files"
  against = from_trunk ? "vs trunk" : "uncommitted (vs HEAD)"
  ["#{head} (#{files.length} #{word} changed #{against})", files]
rescue
  nil
end

.cc_blob_bytes(root, base, path) ⇒ Object 



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# File 'lib/bitfab/replay.rb', line 550

def cc_blob_bytes(root, base, path)
  out = git(root, ["cat-file", "-s", "#{base}:#{path}"])
  (out && !out.strip.empty?) ? out.strip.to_i : 0
rescue
  0
end

.cc_looks_binary?(str) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bitfab/replay.rb', line 634

def cc_looks_binary?(str)
  str[0, 8000].include?("\0")
end

.cc_parse_name_status_z(raw) ⇒ Object 



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# File 'lib/bitfab/replay.rb', line 617

def cc_parse_name_status_z(raw)
  parts = raw.split("\0").reject(&:empty?)
  out = []
  i = 0
  while i + 1 < parts.length
    out << [parts[i][0], parts[i + 1]]
    i += 2
  end
  out
end

.cc_read_working_file(root, path) ⇒ Object 



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# File 'lib/bitfab/replay.rb', line 628

def cc_read_working_file(root, path)
  File.read(File.join(root, path), encoding: "UTF-8")
rescue
  ""
end

.cc_ref_exists?(root, ref) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bitfab/replay.rb', line 527

def cc_ref_exists?(root, ref)
  !git(root, ["rev-parse", "--verify", "#{ref}^{object}"]).nil?
end

.cc_resolve_base(root) ⇒ Object

Returns [base, from_trunk]; from_trunk is false on the HEAD fallback.



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# File 'lib/bitfab/replay.rb', line 532

def cc_resolve_base(root)
  forced = ENV["BITFAB_CODE_CHANGE_BASE"]
  if forced && cc_ref_exists?(root, forced)
    mb = git(root, ["merge-base", "HEAD", forced])
    return [mb.strip, true] if mb && !mb.strip.empty?

    rp = git(root, ["rev-parse", "--verify", forced])
    return (rp && !rp.strip.empty?) ? [rp.strip, true] : nil
  end
  TRUNK_CANDIDATES.each do |candidate|
    next unless cc_ref_exists?(root, candidate)

    mb = git(root, ["merge-base", "HEAD", candidate])
    return [mb.strip, true] if mb && !mb.strip.empty?
  end
  cc_ref_exists?(root, "HEAD") ? ["HEAD", false] : nil
end

.cc_working_bytes(root, path) ⇒ Object 



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# File 'lib/bitfab/replay.rb', line 557

def cc_working_bytes(root, path)
  File.size(File.join(root, path))
rescue
  0
end

.db_branch_enabled?(db_branch) ⇒ Boolean

Whether the caller asked for database branching. true and a Hash both turn it on; false and nil leave it off. Kept separate from db_branch_settings because db_branch: true enables branching while contributing no settings, so the presence of settings can't stand in for the switch.

Returns:

  • (Boolean) 


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# File 'lib/bitfab/replay.rb', line 446

def db_branch_enabled?(db_branch)
  !db_branch.nil? && db_branch != false
end

.db_branch_settings(db_branch) ⇒ Object

Convert the caller's db_branch options to the wire shape, or nil when nothing was set. Dropping the key entirely keeps the request identical to what older SDKs send. Booleans carry no settings: they only move the switch.

Keys: :min_cu and :max_cu are the branch compute's autoscaling floor and ceiling in Neon Compute Units (equal values pin the size, keeping items comparable); :warmup_sql is appended to the branch's readiness check so it warms the cache before the replayed function sees the lease.



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# File 'lib/bitfab/replay.rb', line 459

def db_branch_settings(db_branch)
  return nil if db_branch.nil? || db_branch == true || db_branch == false || db_branch.empty?

  # Symbol or string keys, matching normalize_code_change_files: a hash
  # assembled from JSON or YAML would otherwise be read as empty, leaving
  # the branch on the mirror's defaults with no error to notice.
  min_cu = db_branch[:min_cu] || db_branch["min_cu"]
  max_cu = db_branch[:max_cu] || db_branch["max_cu"]
  warmup_sql = db_branch[:warmup_sql] || db_branch["warmup_sql"]

  settings = {}
  settings["minCu"] = min_cu unless min_cu.nil?
  settings["maxCu"] = max_cu unless max_cu.nil?
  settings["warmupSql"] = warmup_sql unless warmup_sql.nil?
  settings.empty? ? nil : settings
end

.execute_item(item, receiver, method_name, test_run_id, input_source_span_id = nil, metrics = {}, input_source_trace_id: nil, mock_strategy: "marked", mock_tree: nil, mock_overrides: nil, fetch_span_output: nil, adapt_inputs: nil, adapt_ctx: nil, db_branch_lease: nil, source_bitfab_trace_id: nil, db_snapshot_ref: nil, http_client: nil) ⇒ Object

Execute a single replay item: deserialize inputs, call method with replay context.



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# File 'lib/bitfab/replay.rb', line 1120

def execute_item(item, receiver, method_name, test_run_id, input_source_span_id = nil, metrics = {},
  input_source_trace_id: nil, mock_strategy: "marked", mock_tree: nil, mock_overrides: nil,
  fetch_span_output: nil, adapt_inputs: nil, adapt_ctx: nil, db_branch_lease: nil, source_bitfab_trace_id: nil,
  db_snapshot_ref: nil, http_client: nil)
  args, kwargs = Serialize.deserialize_inputs(item)

  fn_result = nil
  fn_error = nil
  replay_error = nil
  # Client-side correlation id that tags this item's replay spans so the
  # server can echo back the row id it minted (resolved in run()'s
  # complete-replay loop). Carried on the item under :_sdk_trace_id, never
  # surfaced as the public :trace_id.
  sdk_trace_id = SecureRandom.uuid
  # Declared before this item's first span is submitted: the transport
  # records delivery only for traces someone asked about, so anything
  # submitted before this would go untracked.
  http_client&.track_trace_deliveries([sdk_trace_id])

  begin
    ReplayContext.with_context(
      test_run_id:,
      input_source_span_id:,
      input_source_trace_id:,
      trace_id: sdk_trace_id,
      mock_tree:,
      mock_strategy:,
      mock_overrides:,
      fetch_span_output:,
      db_branch_lease:,
      source_bitfab_trace_id:
    ) do
      begin
        if adapt_inputs
          ctx = adapt_ctx || {
            original_trace_id: nil,
            original_span_id: input_source_span_id,
            # Deprecated aliases for original_trace_id/original_span_id.
            source_trace_id: nil,
            source_span_id: input_source_span_id
          }
          args, kwargs = adapt_inputs.call(args, kwargs, ctx)
        end
      rescue => e
        replay_error = e
      end
      if replay_error.nil?
        begin
          fn_result = if kwargs.empty?
            receiver.send(method_name, *args)
          else
            receiver.send(method_name, *args, **kwargs)
          end
        rescue => e
          fn_error = e
        end
      end
    end
  rescue => e
    replay_error = e
  end

  item_error = fn_error || replay_error
  {
    input: args,
    result: fn_result,
    original_output: item["output"],
    error: item_error&.message,
    trace_error: fn_error,
    replay_error:,
    duration_ms: metrics[:duration_ms],
    tokens: metrics[:tokens],
    model: metrics[:model],
    # Written in by run() from the complete-replay response once the server
    # has minted this replay trace's row. Nil until then: the client-side
    # correlation id (below) is never surfaced as the public :trace_id.
    trace_id: nil,
    _sdk_trace_id: sdk_trace_id,
    original_trace_id: source_bitfab_trace_id,
    original_span_id: input_source_span_id,
    # Deprecated aliases for original_trace_id/original_span_id.
    source_trace_id: source_bitfab_trace_id,
    source_span_id: input_source_span_id,
    db_snapshot_ref:
  }
end

.extract_server_item_metrics(server_item) ⇒ Object

Pull durationMs / model from the start-replay server item. Nil-safe defaults so older servers without these fields still produce a consistent shape. Tokens are intentionally NOT read from the start item (it carries the ORIGINAL trace's tokens); the replayed run's tokens are filled in by run() from the complete-replay response once spans are aggregated server-side, and stay nil here and on older servers.



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# File 'lib/bitfab/replay.rb', line 1037

def extract_server_item_metrics(server_item)
  {
    duration_ms: server_item["durationMs"],
    tokens: nil,
    model: server_item["model"]
  }
end

.extract_span_data(span) ⇒ Object

Extract input/output data from an external span's rawData.



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# File 'lib/bitfab/replay.rb', line 1019

def extract_span_data(span)
  raw_data = span["rawData"] || {}
  span_data = raw_data["span_data"] || {}

  {
    "input" => span_data["input"],
    "output" => span_data["output"],
    "inputSerialized" => span_data["input_serialized"],
    "outputSerialized" => span_data["output_serialized"]
  }
end

.git(cwd, args) ⇒ Object 



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# File 'lib/bitfab/replay.rb', line 510

def git(cwd, args)
  # capture3 so git's stderr (e.g. "not a git repository") is swallowed, not
  # leaked to the host process's console.
  out, _err, status = Timeout.timeout(30) do
    Open3.capture3("git", *args, chdir: cwd)
  end
  return nil unless status.success?

  # Tag as UTF-8 and scrub invalid bytes so blob contents compare cleanly
  # against the UTF-8 working-file reads and never break JSON.generate later
  # (a non-UTF-8 file that slips past the null-byte check would otherwise
  # abort the whole start-replay request).
  out.force_encoding("UTF-8").scrub
rescue
  nil
end

.json_safe(value) ⇒ Object 



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# File 'lib/bitfab/replay.rb', line 112

def json_safe(value)
  case value
  when Exception
    serialized = {type: value.class.name, message: value.message, backtrace: value.backtrace}
    if value.is_a?(DbBranchReplayError)
      serialized[:code] = value.code
      serialized[:original_trace_id] = value.original_trace_id
      serialized[:cause] = json_safe(value.cause) if value.cause
    end
    serialized
  when Hash
    value.to_h { |key, child| [key, json_safe(child)] }
  when Array
    value.map { |child| json_safe(child) }
  else
    value
  end
end

.normalize_tokens(raw_tokens) ⇒ Object

Normalize a complete-replay tokens hash (string-keyed JSON) into the symbol-keyed shape the replay item exposes. Nil when the server reported no token data for this trace.



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# File 'lib/bitfab/replay.rb', line 1108

def normalize_tokens(raw_tokens)
  return nil unless raw_tokens.is_a?(Hash)

  {
    input: raw_tokens["input"],
    output: raw_tokens["output"],
    cached: raw_tokens["cached"],
    total: raw_tokens["total"]
  }
end

.original_span_id_of(server_item) ⇒ Object 



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# File 'lib/bitfab/replay.rb', line 936

def original_span_id_of(server_item)
  server_item["originalSpanId"] || server_item["sourceSpanId"]
end

.original_trace_id_of(server_item) ⇒ Object

The ORIGINAL (historical) trace/span an item replays. Canonical server keys are originalTraceId/originalSpanId; older servers send them under the deprecated sourceTraceId/sourceSpanId aliases.



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# File 'lib/bitfab/replay.rb', line 932

def original_trace_id_of(server_item)
  server_item["originalTraceId"] || server_item["sourceTraceId"]
end

.preserve_replay_failure(items, test_run_id, test_run_url) ⇒ Object 



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# File 'lib/bitfab/replay.rb', line 144

def preserve_replay_failure(items, test_run_id, test_run_url)
  yield
rescue => cause
  error = ReplayError.new(
    cause.message,
    items: public_replay_items(items),
    test_run_id:,
    test_run_url:
  )
  raise error, cause:
end

.process_items(http_client, server_items, receiver, method_name, test_run_id, max_concurrency, mock_strategy, adapt_inputs = nil, include_db_branch_lease = false, db_branch_settings = nil, on_item_start: nil, on_item_finish: nil, mock_overrides: []) ⇒ Object

Process all replay items, optionally in parallel using threads.



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# File 'lib/bitfab/replay.rb', line 652

def process_items(http_client, server_items, receiver, method_name, test_run_id, max_concurrency, mock_strategy,
  adapt_inputs = nil, include_db_branch_lease = false, db_branch_settings = nil, on_item_start: nil, on_item_finish: nil,
  mock_overrides: [])
  concurrency = max_concurrency || server_items.length

  # Lifecycle callbacks run from worker threads in the parallel path, so the
  # mutex makes counter updates safe and serializes each callback. A raising
  # callback is swallowed because progress UI must never crash the run.
  total = server_items.length
  progress_mutex = Mutex.new
  started = 0
  completed = 0
  succeeded = 0
  errored = 0
  # Each event carries the single item that just finished so a progress UI
  # can render per-trace pass/fail as the run streams. The item's :trace_id
  # is the server's assigned traces.id, read back off the ingest response and
  # surfaced as this item finishes (its trace is flushed on finish); nil only
  # if that flush could not confirm delivery in time (the end-of-run barrier
  # then fills the returned item), and the client correlation id is never
  # surfaced. original_trace_id (the historical trace being replayed, taken
  # from the server item) is what a UI keys on to identify what just finished.
  # source_trace_id/source_span_id are kept as deprecated aliases.
  report_start = lambda do |original_trace_id, original_span_id|
    progress_mutex.synchronize do
      started += 1
      next unless on_item_start

      begin
        on_item_start.call({
          type: "started", test_run_id:, started:, completed:, total:, succeeded:, errored:,
          item: {
            original_trace_id:,
            original_span_id:,
            source_trace_id: original_trace_id,
            source_span_id: original_span_id
          }
        })
      rescue => e
        warn "Bitfab: replay on_item_start callback raised: #{e.message}"
      end
    end
  end

  # Flush an item's trace the moment it finishes, so its server traces.id is
  # read back off the ingest response and surfaced on the item as it settles,
  # instead of waiting for the end-of-run barrier. Waiting until the end is
  # worst at low concurrency: each trace is closed and ready when its item
  # finishes, but nothing fills a batch to force an export, so ready ids sit
  # in the queue for the whole run. Serializing on a mutex keeps concurrent
  # finishers from storming the server: a flush drains the whole queue, so
  # the first finisher exports the batch and the rest find nothing to send.
  flush_mutex = Mutex.new
  flush_finished_item_trace = lambda do
    flush_mutex.synchronize { Bitfab.flush_traces(timeout: PERSISTENCE_TIMEOUT_SECONDS) }
  rescue => e
    warn "Bitfab: replay per-item flush failed: #{e.message}"
  end

  report = lambda do |result, original_trace_id, original_span_id, test_run_id|
    # Deliver this item's trace now, then read its server id back off the
    # ingest response. A flush failure never crashes the run: the id stays
    # nil and the end-of-run barrier remains the authority on persistence.
    flush_finished_item_trace.call
    result[:trace_id] = http_client.peek_server_trace_id(result[:_sdk_trace_id]) || result[:trace_id]
    progress_mutex.synchronize do
      completed += 1
      error = result[:error]
      error.nil? ? (succeeded += 1) : (errored += 1)
      next unless on_item_finish

      begin
        on_item_finish.call({
          test_run_id:, completed:, total:, succeeded:, errored:,
          item: {
            trace_id: result[:trace_id],
            original_trace_id:,
            original_span_id:,
            # Deprecated aliases for original_trace_id/original_span_id.
            source_trace_id: original_trace_id,
            source_span_id: original_span_id,
            input: result[:input],
            result: result[:result],
            original_output: result[:original_output],
            error:,
            trace_error: result[:trace_error],
            replay_error: result[:replay_error],
            duration_ms: result[:duration_ms],
            tokens: result[:tokens],
            model: result[:model],
            db_snapshot_ref: result[:db_snapshot_ref]
          }
        })
      rescue => e
        warn "Bitfab: replay on_item_finish callback raised: #{e.message}"
      end
    end
  end

  if concurrency <= 1
    server_items.map do |item|
      report_start.call(original_trace_id_of(item), original_span_id_of(item))
      result = process_single_item(http_client, item, receiver, method_name, test_run_id, mock_strategy,
        adapt_inputs, include_db_branch_lease, db_branch_settings, mock_overrides:)
      report.call(result, original_trace_id_of(item), original_span_id_of(item), test_run_id)
      result
    end
  else
    results_mutex = Mutex.new
    results = []
    work_queue = server_items.each_with_index.to_a
    work_mutex = Mutex.new

    workers = [concurrency, server_items.length].min.times.map do
      Thread.new do
        loop do
          item, idx = work_mutex.synchronize { work_queue.shift }
          break unless item

          report_start.call(original_trace_id_of(item), original_span_id_of(item))
          result = process_single_item(http_client, item, receiver, method_name, test_run_id, mock_strategy,
            adapt_inputs, include_db_branch_lease, db_branch_settings, mock_overrides:)
          results_mutex.synchronize { results[idx] = result }
          report.call(result, original_trace_id_of(item), original_span_id_of(item), test_run_id)
        end
      end
    end

    workers.each(&:join)
    results.compact
  end
end

.process_single_item(http_client, server_item, receiver, method_name, test_run_id, mock_strategy, adapt_inputs = nil, include_db_branch_lease = false, db_branch_settings = nil, mock_overrides: []) ⇒ Object

Fetch span data and execute a single replay item.

Any error while fetching the span, building the mock tree, or deserializing inputs is captured on the returned item's :error rather than propagated, so one bad trace never aborts the whole replay run (mirrors the TypeScript and Python SDKs' per-item rescue).



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# File 'lib/bitfab/replay.rb', line 791

def process_single_item(http_client, server_item, receiver, method_name, test_run_id, mock_strategy,
  adapt_inputs = nil, include_db_branch_lease = false, db_branch_settings = nil, mock_overrides: [])
  metrics = extract_server_item_metrics(server_item)
  # The ORIGINAL (historical) trace/span this item replays. Canonical
  # keys are originalTraceId/originalSpanId; older servers send them under
  # the deprecated sourceTraceId/sourceSpanId aliases (see *_of helpers).
  original_trace_id = original_trace_id_of(server_item)
  original_span_id = original_span_id_of(server_item)
  # The server resolves a Neon preview branch per item during /replay/start
  # (only when include_db_branch_lease was sent). Release it in the +ensure+
  # below so any raise (span fetch, mock-tree build, or the replayed
  # method) frees the Neon resource. Items whose source trace had no
  # snapshot ref arrive without a lease (env.active? is false), and
  # replaying those against the live database is correct.
  lease = include_db_branch_lease ? server_item["dbBranchLease"] : nil
  # A resolve that was ATTEMPTED and failed is different: the caller asked
  # for a branch, so running their method against live data would produce a
  # result that looks valid and is not. Fail the item instead, loudly.
  lease_error = include_db_branch_lease ? server_item["dbBranchLeaseError"] : nil
  db_snapshot_ref = server_item["dbSnapshotRef"]
  if include_db_branch_lease && lease.nil? && lease_error.nil?
    begin
      resolved = http_client.resolve_db_branch_lease(test_run_id, original_trace_id, db_branch_settings)
    rescue => cause
      error = DbBranchReplayError.new(
        "lease_request_failed",
        "Bitfab could not request the database branch: #{cause.message}",
        original_trace_id
      )
      raise error, cause:
    end
    lease = resolved["lease"]
    lease_error = resolved["leaseError"]
    db_snapshot_ref = resolved["dbSnapshotRef"] || db_snapshot_ref
  end
  if lease_error
    raise DbBranchReplayError.new(
      lease_error["code"].to_s,
      lease_error["message"].to_s,
      original_trace_id
    )
  end

  span = http_client.get_external_span(original_span_id, replay_view: true)
  item_data = extract_span_data(span)

  # Fetch the span tree when the base strategy needs recorded outputs
  # ("all"/"marked") OR when selective mock overrides are present. Overrides
  # gate on the same non-root call-counter machinery the tree drives, so
  # the tree must be fetched for them to fire even under mock: "none".
  #
  # Only mock: "all" needs every span's recorded output inline (it mocks
  # every child), so it fetches an eager tree. "marked" and overrides mock
  # only a few spans, so they fetch a payload-free tree (includeOutputs=
  # false) and pull each mocked span's output lazily by externalSpanId,
  # never dragging down outputs that no span consumes.
  overrides_present = !mock_overrides.nil? && !mock_overrides.empty?
  include_outputs = mock_strategy == "all"
  mock_tree = nil
  if mock_strategy == "all" || mock_strategy == "marked" || overrides_present
    begin
      tree = http_client.get_span_tree(
        original_span_id,
        include_outputs:,
        include_root_output: false
      )
      mock_tree = build_mock_tree(tree["root"] || {})
    rescue Exception => e # rubocop:disable Lint/RescueException
      raise if e.is_a?(SystemExit) || e.is_a?(SignalException)
      # "all" and overrides both depend on the tree: "all" mocks every span
      # from it, and overrides gate on its call-counter machinery. If the
      # fetch fails, surface the error on the item rather than silently
      # running everything real with the overrides dropped. Only bare
      # "marked" can fall back to real execution (its marked spans just
      # re-run). Mirrors the Python SDK's has_overrides re-raise.
      raise if mock_strategy == "all" || overrides_present
      mock_tree = nil
    end
  end

  # Memoized per-item lazy fetcher, present only on the payload-free path
  # (not eager "all", whose outputs are already inline). Passed to the
  # replay context so resolve_recorded_output can pull a mocked span's
  # output on demand, once per span even if read twice (base mock + an
  # override's get_original_output).
  fetch_span_output = (mock_tree && !include_outputs) ? build_span_output_fetcher(http_client) : nil

  adapt_ctx = {
    original_trace_id:,
    original_span_id:,
    # Deprecated aliases for original_trace_id/original_span_id.
    source_trace_id: original_trace_id,
    source_span_id: original_span_id
  }

  execute_item(
    item_data,
    receiver,
    method_name,
    test_run_id,
    span["id"],
    metrics,
    input_source_trace_id: span["externalTraceId"],
    mock_strategy:,
    mock_tree:,
    mock_overrides:,
    fetch_span_output:,
    adapt_inputs:,
    adapt_ctx:,
    db_branch_lease: lease,
    source_bitfab_trace_id: original_trace_id,
    db_snapshot_ref:,
    http_client:
  )
rescue => e
  warn "Bitfab: replay item for span #{original_span_id} failed before execution: #{e.message}"
  {
    input: [],
    result: nil,
    original_output: nil,
    error: replay_item_error_message(e),
    trace_error: nil,
    replay_error: e,
    duration_ms: metrics&.dig(:duration_ms),
    tokens: metrics&.dig(:tokens),
    model: metrics&.dig(:model),
    trace_id: nil,
    original_trace_id:,
    original_span_id:,
    # Deprecated aliases for original_trace_id/original_span_id.
    source_trace_id: original_trace_id,
    source_span_id: original_span_id,
    db_snapshot_ref:
  }
ensure
  release_db_branch_lease(http_client, lease) if lease
end

.public_replay_items(items) ⇒ Object 



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# File 'lib/bitfab/replay.rb', line 140

def public_replay_items(items)
  items.map { |item| item.except(:_sdk_trace_id) }
end

.read_code_change_file ⇒ Object 



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# File 'lib/bitfab/replay.rb', line 490

def read_code_change_file
  path = ENV["BITFAB_CODE_CHANGE_PATH"]
  return nil if path.nil? || path.empty?

  begin
    parsed = JSON.parse(File.read(path))
    files = parsed["files"]
    # A malformed payload (non-array, or entries that aren't hashes) must
    # yield no code change, never crash normalize_code_change_files.
    files = nil unless files.is_a?(Array) && files.all?(Hash)
    description = parsed["description"]
    description = nil unless description.is_a?(String)
    return nil if files.nil? && description.nil?

    [description, files]
  rescue
    nil
  end
end

.release_db_branch_lease(http_client, lease) ⇒ Object

Delete the per-item Neon preview branch. Best-effort: a failure is warned but never raised: the server-side TTL janitor reaps orphans.



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# File 'lib/bitfab/replay.rb', line 942

def release_db_branch_lease(http_client, lease)
  neon_branch_id = lease["neonBranchId"]
  return unless neon_branch_id

  http_client.release_db_branch_lease(neon_branch_id)
rescue => e
  warn "Bitfab: failed to release DB branch #{neon_branch_id} (TTL janitor will catch it): #{e.message}"
end

.replay_item_error_message(error) ⇒ Object 



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# File 'lib/bitfab/replay.rb', line 131

def replay_item_error_message(error)
  return error.message unless error.is_a?(DbBranchReplayError)

  "Replay requested a database branch for trace #{error.original_trace_id} but it " \
    "could not be resolved (#{error.code}): #{error.message}. The method was not run, " \
    "because replaying it against the live database would produce a result that looks " \
    "valid but did not use the historical data you asked for."
end

.resolve_auto_code_change(label = nil) ⇒ Object

Auto-capture the code change to attach when the caller passed none. Lives in replay() (the one call guaranteed to run on every replay) so it works no matter how the replay was launched. Precedence: a BITFAB_CODE_CHANGE_PATH override, else the git diff vs trunk. Best-effort: any failure yields nil. An explicit code_change_files always wins over this.



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# File 'lib/bitfab/replay.rb', line 481

def resolve_auto_code_change(label = nil)
  return nil if ENV["BITFAB_DISABLE_CODE_CHANGE_CAPTURE"]

  from_env = read_code_change_file
  return from_env unless from_env.nil?

  capture_code_change_from_git(Dir.pwd, label)
end

.run(client, receiver, method_name, trace_function_key:, limit: nil, trace_ids: nil, name: nil, max_concurrency: 10, code_change_description: CODE_CHANGE_UNSET, code_change_files: CODE_CHANGE_UNSET, experiment_group_id: nil, dataset_id: nil, grader_ids: nil, mock: "marked", adapt_inputs: nil, mock_override: nil, db_branch: nil, on_item_start: nil, on_item_finish: nil, on_progress: nil) ⇒ Hash

Replay historical traces through a method and create a test run.

Fetches the last N traces for the given trace function key, re-runs each through the provided receiver and method, and returns comparison data.

Parameters:

  • client (Bitfab::Client) —

    the Bitfab client instance

  • receiver (Object, Class) —

    an instance for instance methods, or a Class for class methods

  • method_name (Symbol) —

    the method to replay

  • trace_function_key (String) —

    the trace function key for this method

  • limit (Integer, nil) (defaults to: nil) —

    maximum number of traces to replay (default: 5). Ignored when trace_ids is passed (with a warning): an explicit ID list already determines how many traces replay.

  • trace_ids (Array<String>, nil) (defaults to: nil) —

    optional list of trace IDs to replay (max 100)

  • name (String, nil) (defaults to: nil) —

    optional display name for the resulting experiment/test run

  • max_concurrency (Integer, nil) (defaults to: 10) —

    max threads for parallel replay (default: 10)

  • code_change_description (String, nil) (defaults to: CODE_CHANGE_UNSET) —

    optional rationale for the code change being tested in this replay (stored on the experiment). When supplied without code_change_files, this text is preserved while the SDK automatically captures the files. Pass nil when the replay should have no description; use code_change_files: nil to suppress automatic file capture.

  • code_change_files (Array<Hash>, nil) (defaults to: CODE_CHANGE_UNSET) —

    optional list of edited files, each as { path:, before:, after: } (empty string for new/deleted files). Omit to capture automatically, or pass nil to suppress file capture.

  • experiment_group_id (String, nil) (defaults to: nil) —

    optional UUID grouping multiple replay runs into a single experiment batch

  • dataset_id (String, nil) (defaults to: nil) —

    optional UUID of the dataset this replay runs against, stored on the resulting experiment for durable attribution

  • grader_ids (Array<String>, nil) (defaults to: nil) —

    optional UUIDs of graders attached directly to this experiment, graded as the union with the dataset's runnable graders at completion; each must be an active/live grader in the same org and trace function or the server rejects the replay

  • mock (String) (defaults to: "marked") —

    mock strategy for child spans: "marked" (default), "none", or "all". "marked" only mocks spans declared with mock_on_replay: true; "all" mocks every child span.

  • adapt_inputs (#call, nil) (defaults to: nil) —

    optional hook to reshape recorded inputs onto the method's current signature when its shape changed after the traces were captured. Receives (args, kwargs, ctx) where ctx is { original_trace_id:, original_span_id: } (with deprecated source_trace_id/source_span_id aliases), and returns [new_args, new_kwargs]. Runs per item inside the same rescue as the method, so a raising adapter sets that item's :error rather than crashing the run.

  • db_branch (Boolean, Hash, nil) (defaults to: nil) —

    true branches with the mirror project's own sizing; a Hash tunes it and +false+/+nil+ leave branching off. Keys +:min_cu+/+:max_cu+ are the branch compute's autoscaling floor and ceiling in Neon Compute Units, and :warmup_sql warms the branch's cache before the replayed method sees it. Read the resolved branch inside the method with Bitfab.current_replay_branch.

  • on_item_finish (#call, nil) (defaults to: nil) —

    optional callback invoked once per item as it finishes, with a running-totals hash { completed:, total:, succeeded:, errored:, item: } where item is { trace_id:, original_trace_id:, original_span_id:, error:, duration_ms: } for the single item that just finished (source_trace_id/source_span_id remain as deprecated aliases). trace_id is the new server replay trace id, written in after the run completes (nil during progress callbacks); original_trace_id is the ORIGINAL (historical) trace that was replayed, error is that item's replay error or nil, and duration_ms is how long that one trace took to replay. Use it to render replay progress (e.g. a per-trace log). A raising callback never crashes the run.

  • on_progress (#call, nil) (defaults to: nil) —

    deprecated compatibility callback. It receives the same per-item finish events plus the legacy whole-run "complete" event. Ignored when on_item_finish is also provided.

  • on_item_start (#call, nil) (defaults to: nil) —

    optional callback invoked when a worker begins processing each item, before replay setup and customer code run. Pair it with on_item_finish to distinguish queued work from in-flight work. A raising callback never crashes the run.

Returns:

  • (Hash) —

    with :items, :test_run_id, :test_run_url



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# File 'lib/bitfab/replay.rb', line 224

def run(client, receiver, method_name, trace_function_key:, limit: nil, trace_ids: nil, name: nil,
  max_concurrency: 10, code_change_description: CODE_CHANGE_UNSET, code_change_files: CODE_CHANGE_UNSET, experiment_group_id: nil,
  dataset_id: nil, grader_ids: nil, mock: "marked",
  adapt_inputs: nil, mock_override: nil, db_branch: nil, on_item_start: nil, on_item_finish: nil, on_progress: nil)
  unless MOCK_STRATEGIES.include?(mock.to_s)
    raise ArgumentError, "Invalid mock strategy '#{mock}'. Must be one of: #{MOCK_STRATEGIES.join(", ")}"
  end
  item_finish_callback = on_item_finish || on_progress
  if trace_ids
    raise ArgumentError, "trace_ids must contain at least one trace ID." if trace_ids.empty?
    if trace_ids.length > 100
      raise ArgumentError, "trace_ids supports at most 100 trace IDs per replay (got #{trace_ids.length})."
    end
  end
  if limit && trace_ids
    warn "Bitfab: limit is ignored when trace_ids is passed: the explicit trace ID list already " \
      "determines how many traces replay."
  end

  # Reject a trace_function_key that contradicts the method's declared key.
  # replay() fetches historical traces by trace_function_key but records the
  # replayed spans under the method's own bitfab_span key (via send below),
  # so a mismatch produces an incoherent test run (traces fetched for one
  # function, recorded under another). Only fires when the method's key is
  # introspectable; an untraced method falls through to the persistence
  # check in complete_replay. Mirrors the TypeScript/Python SDKs.
  declared_key = Traceable.trace_function_key_for(receiver, method_name)
  if declared_key && declared_key != trace_function_key
    raise ArgumentError,
      "Method #{method_name} is traced under trace function key '#{declared_key}' but replay was " \
      "called with '#{trace_function_key}'. Pass trace_function_key: '#{declared_key}' to replay it, " \
      "or point at the method traced under '#{trace_function_key}'."
  end

  http_client = client.instance_variable_get(:@http_client)

  # Resolved override list: per-call overrides FIRST (they win), then the
  # client's registered overrides. First matching override wins downstream,
  # so this ordering makes per-call take precedence over registered, and
  # both take precedence over the base mock strategy.
  registered_overrides = client.instance_variable_get(:@mock_overrides) || []
  resolved_overrides = MockOverride.normalize(mock_override) + registered_overrides

  # limit is meaningless with explicit trace_ids (the ID list determines
  # the count), so it's omitted from the request entirely.
  effective_limit = trace_ids ? nil : (limit || 5)

  include_db_branch_lease = db_branch_enabled?(db_branch)

  # code_change_files controls capture: omitted auto-captures, an array
  # wins, and explicit nil opts out. Preserve a caller-supplied description
  # while filling only the omitted files.
  if code_change_files.equal?(CODE_CHANGE_UNSET)
    captured = resolve_auto_code_change(name)
    unless captured.nil?
      code_change_files = captured[1]
      code_change_description = captured[0] if code_change_description.equal?(CODE_CHANGE_UNSET)
    end
  end
  code_change_description = nil if code_change_description.equal?(CODE_CHANGE_UNSET)
  code_change_files = nil if code_change_files.equal?(CODE_CHANGE_UNSET)

  resolved_db_branch_settings = db_branch_settings(db_branch)
  replay_data = http_client.start_replay(
    trace_function_key,
    effective_limit,
    trace_ids:,
    name:,
    code_change_description:,
    code_change_files:,
    experiment_group_id:,
    include_db_branch_lease:,
    dataset_id:,
    grader_ids:,
    db_branch_settings: resolved_db_branch_settings
  )
  test_run_id = replay_data["testRunId"]
  test_run_url = replay_data["testRunUrl"]
  full_test_run_url = "#{client.service_url}#{test_run_url}"
  server_items = replay_data["items"] || []

  result_items = if server_items.any?
    process_items(http_client, server_items, receiver, method_name, test_run_id, max_concurrency, mock.to_s,
      adapt_inputs, include_db_branch_lease, resolved_db_branch_settings, on_item_start:,
      on_item_finish: item_finish_callback,
      mock_overrides: resolved_overrides)
  else
    []
  end

  # Spans and completions ride a batched transport, so the run is only safe
  # to finalize once the server confirms every replay trace it queued: the
  # trace-ID mapping complete_replay builds would otherwise race the
  # in-flight batches and hand back nil for every item.
  delivered_trace_ids = preserve_replay_failure(result_items, test_run_id, full_test_run_url) do
    wait_for_replay_persistence(http_client, test_run_id, result_items.map { |item| item[:_sdk_trace_id] })
  end

  # Primary source for item[:trace_id]: the server's assigned traces.id, read
  # back per trace off the ingest response during the flush above (server-
  # sourced, no polling, already in hand before complete_replay). The
  # complete_replay map below remains the fallback for servers that don't
  # return ids on ingest.
  result_items.each do |item|
    local_id = item[:_sdk_trace_id]
    read_back = local_id && delivered_trace_ids[local_id]
    item[:trace_id] = read_back if read_back
  end

  # complete_replay finalizes the run and returns the token/diagnostic
  # mapping; its failures propagate loudly because a run that never
  # completed can't be finalized.
  complete_response = preserve_replay_failure(result_items, test_run_id, full_test_run_url) do
    http_client.complete_replay(test_run_id)
  end
  trace_id_map = complete_response&.dig("traceIds")
  # Per-replay-trace token usage keyed by server trace id: the REPLAYED
  # run's tokens (span-aggregated server-side), used below to fill each
  # item's :tokens.
  replay_tokens = complete_response&.dig("tokens") || {}

  # trace_id_map maps each item's client-side correlation id (:_sdk_trace_id,
  # which tagged that item's spans during the run) to the server's trace row
  # id. We use it to write the real server replay trace id into item[:trace_id]
  # now that the row exists, attach each item's server-aggregated token usage,
  # and detect a systemic upload failure early. Verdict persistence does NOT
  # use this map: it is keyed by the original-trace lineage (:original_trace_id +
  # test_run_id), which needs no client-held server id. Older servers that omit
  # the map yield no replay tokens and leave item[:trace_id] nil.
  unless trace_id_map.nil?
    missing = []
    completed_count = 0
    result_items.each do |item|
      local_id = item[:_sdk_trace_id]
      mapped = local_id && trace_id_map[local_id]
      # Fallback fill for servers that did not return ids on the ingest
      # response; the read-back loop above already set it when they did, so
      # never overwrite a resolved id with nil here.
      item[:trace_id] ||= mapped
      if item[:error].nil?
        completed_count += 1
        missing << local_id if mapped.nil?
      end
      item[:tokens] = normalize_tokens(replay_tokens[mapped]) if mapped
    end
    # ALL completed items missing: systemic (the replayed method is not
    # traced, or uploads are wholesale broken). Raise; the run's traces
    # never persisted, so nothing can be labeled.
    if completed_count.positive? && missing.length == completed_count
      trace_count = complete_response["traceCount"]
      server_count = trace_count.nil? ? "" : " The server persisted #{trace_count} trace(s) for this run."
      cause = RuntimeError.new("Replay completed but the server has no persisted trace for " \
        "any of the #{completed_count} completed item(s) " \
        "(test_run_id #{test_run_id}).#{server_count} Trace uploads were " \
        "flushed, so either the uploads failed or the replayed method is " \
        "not traced (no root span was emitted).")
      error = ReplayError.new(
        cause.message,
        items: public_replay_items(result_items),
        test_run_id:,
        test_run_url: full_test_run_url
      )
      raise error, cause:
    end
    # SOME completed items missing: per-item upload failure. Warn, but
    # return the run; the items that landed can still be labeled.
    if missing.any?
      warn "Bitfab: server has no persisted trace for #{missing.length} of " \
        "#{completed_count} completed replay item(s) " \
        "(test_run_id #{test_run_id}). Their replay token usage is " \
        "unavailable and they cannot be labeled."
    end
  end

  # Strip the internal correlation handle so returned items expose only the
  # public shape (runs against older servers that omit the map too).
  result_items.each { |item| item.delete(:_sdk_trace_id) }

  result = {
    items: result_items,
    test_run_id:,
    test_run_url: full_test_run_url
  }
  # Persist the enriched result so the Bitfab plugin never has to parse the
  # replay's stdout, which a dependency's logging can corrupt.
  write_replay_result_file(result)
  # Preserve the legacy terminal event only for on_progress. on_item_finish
  # is strictly item-scoped, so every invocation always includes an item.
  if on_item_finish.nil? && on_progress
    errored = result_items.count { |item| !item[:error].nil? }
    total = result_items.length
    begin
      on_progress.call({
        type: "complete",
        test_run_id:,
        completed: total,
        total:,
        succeeded: total - errored,
        errored:,
        result:
      })
    rescue => e
      warn "Bitfab: replay on_progress callback raised: #{e.message}"
    end
  end
  result
end

.wait_for_replay_persistence(http_client, test_run_id, sdk_trace_ids) ⇒ Object

Block until the server has persisted every replay trace this run queued.

In the normal case the verdict is local: ingestion commits a request's carriers before it answers, so a flush that delivered every carrier has already proven the traces are whole and polling only asked the server to repeat itself. Acks cannot settle a request that timed out client-side after the server committed, so anything short of fully delivered falls through to the server poll, which stays the authority there.



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# File 'lib/bitfab/replay.rb', line 1053

def wait_for_replay_persistence(http_client, test_run_id, sdk_trace_ids)
  trace_ids = sdk_trace_ids.compact

  # Checked before flushing: a run whose traces never closed submitted
  # nothing to wait on, and must not emit an export request to discover it.
  unless http_client.closed_deliveries?(trace_ids)
    http_client.take_trace_deliveries(trace_ids)
    return {}
  end

  # A failed flush is a hint, not a verdict. It means delivery was not
  # CONFIRMED within the deadline, which is not the same as lost: the export
  # timeout can fire while requests are still in flight and the server goes
  # on to persist every one of them. Failing here failed runs whose data had
  # fully landed.
  flushed = Bitfab.flush_traces(timeout: PERSISTENCE_TIMEOUT_SECONDS)

  raw_deliveries = http_client.take_trace_deliveries(trace_ids)
  # Server-assigned traces.id per replay trace, read back off the ingest
  # response during the flush and keyed by the client-side replay id.
  read_back_trace_ids = raw_deliveries.each_with_object({}) do |(id, report), acc|
    acc[id] = report.server_trace_id unless report.server_trace_id.nil?
  end
  deliveries = raw_deliveries.select { |_id, report| report.closed }
  expected_span_counts = deliveries.transform_values(&:span_count)
  return read_back_trace_ids if expected_span_counts.empty? || deliveries.each_value.all?(&:delivered)

  deadline = Otel.monotonic_now + PERSISTENCE_TIMEOUT_SECONDS
  missing = expected_span_counts.keys

  while missing.any?
    status = http_client.get_replay_status(test_run_id, expected_span_counts)
    ready = status["traceIds"]
    ready = {} unless ready.is_a?(Hash)
    missing = expected_span_counts.keys - ready.keys
    return read_back_trace_ids if missing.empty?
    break if Otel.monotonic_now >= deadline

    sleep((deadline - Otel.monotonic_now).clamp(0, PERSISTENCE_POLL_SECONDS))
  end

  cause = if flushed
    ""
  else
    " Delivery was also not confirmed before the flush deadline, so the " \
      "spans likely never reached the server."
  end
  raise "Replay traces were not fully persisted before the delivery deadline " \
    "(test_run_id #{test_run_id}, missing #{missing.length} of " \
    "#{expected_span_counts.length} trace(s)).#{cause}"
end

.write_replay_result_file(result) ⇒ Object 



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# File 'lib/bitfab/replay.rb', line 638

def write_replay_result_file(result)
  result_path = ENV["BITFAB_REPLAY_RESULT_PATH"]
  return if result_path.nil? || result_path.empty?

  begin
    dir = File.dirname(result_path)
    FileUtils.mkdir_p(dir) unless dir.nil? || dir.empty? || dir == "."
    File.write(result_path, "#{Bitfab.serialize_replay_result(result)}\n")
  rescue => e
    warn "Bitfab: failed to write replay result to BITFAB_REPLAY_RESULT_PATH (#{result_path}): #{e.message}"
  end
end