DalaDev.Tracing (dala_dev v0.0.8)

Distributed tracing for dala Elixir cluster nodes.

Provides tracing capabilities across connected dala nodes to debug message flows, function calls, and GenServer lifecycle events.

Examples

# Start tracing on all connected nodes
{:ok, trace_id} = DalaDev.Tracing.start_trace(:all_nodes, modules: [MyApp, Dala.Screen.Screen])

# Trace specific node
{:ok, trace_id} = DalaDev.Tracing.start_trace(:"dala_qa@192.168.1.5")

# Get trace events
events = DalaDev.Tracing.get_events(trace_id)

# Export to Chrome Tracing format
DalaDev.Tracing.export_chrome_trace(trace_id, "trace.json")

# Stop tracing
:ok = DalaDev.Tracing.stop_trace(trace_id)

Summary

Types

trace_event()

trace_id()

trace_opts()

Functions

export_chrome_trace(trace_id, path)

Export trace events to Chrome Tracing format (JSON).

get_events(trace_id)

Get collected trace events for a trace ID.

start_trace(nodes, opts \\ [])

Start tracing on specified node(s).

stop_trace(trace_id)

Stop tracing and collect final events.

trace_call(node, module, function, args, opts \\ [])

Trace a specific function call on a remote node.

Types

trace_event()

@type trace_event() :: %{
  ts: integer(),
  node: node(),
  event:
    :function_call
    | :message_send
    | :message_receive
    | :process_spawn
    | :process_exit,
  module: module() | nil,
  function: atom() | nil,
  arity: integer() | nil,
  pid: pid(),
  message: term() | nil,
  metadata: keyword()
}

trace_id()

@type trace_id() :: reference()

trace_opts()

@type trace_opts() :: keyword()

Functions

export_chrome_trace(trace_id, path)

@spec export_chrome_trace(trace_id(), Path.t()) :: :ok | {:error, term()}

Export trace events to Chrome Tracing format (JSON).

This format can be loaded in Chrome DevTools (chrome://tracing) or the perfetto UI for visualization.

get_events(trace_id)

@spec get_events(trace_id()) :: [trace_event()]

Get collected trace events for a trace ID.

start_trace(nodes, opts \\ [])

@spec start_trace(node() | :all_nodes | [node()], trace_opts()) ::
  {:ok, trace_id()} | {:error, term()}

Start tracing on specified node(s).

Options:

:modules - List of modules to trace (default: all)
:pids - List of PIDs to trace (default: all)
:events - Events to trace (default: [:function_call, :message_send, :message_receive])
:match_spec - Match specification for :dbg (advanced)

Returns a trace ID that can be used to retrieve events.

stop_trace(trace_id)

@spec stop_trace(trace_id()) :: :ok | {:error, term()}

Stop tracing and collect final events.

trace_call(node, module, function, args, opts \\ [])

@spec trace_call(node(), module(), atom(), list(), keyword()) ::
  {:ok, term(), [trace_event()]} | {:error, term()}

Trace a specific function call on a remote node.

Returns the result and trace events during execution.