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diff --git a/lib/tesla/middleware/telemetry.ex b/lib/tesla/middleware/telemetry.ex
index f2f7f11..02e446d 100644
--- a/lib/tesla/middleware/telemetry.ex
+++ b/lib/tesla/middleware/telemetry.ex
@@ -1,119 +1,120 @@
if Code.ensure_loaded?(:telemetry) do
defmodule Tesla.Middleware.Telemetry do
@moduledoc """
Emits events using the `:telemetry` library to expose instrumentation.
## Example usage
```
defmodule MyClient do
use Tesla
plug Tesla.Middleware.Telemetry
end
:telemetry.attach("my-tesla-telemetry", [:tesla, :request, :stop], fn event, measurements, meta, config ->
# Do something with the event
end)
```
## Telemetry Events
* `[:tesla, :request, :start]` - emitted at the beginning of the request.
* Measurement: `%{system_time: System.system_time()}`
* Metadata: `%{env: Tesla.Env.t()}`
* `[:tesla, :request, :stop]` - emitted at the end of the request.
* Measurement: `%{duration: native_time}`
* Metadata: `%{env: Tesla.Env.t()} | %{env: Tesla.Env.t(), error: term()}`
* `[:tesla, :request, :exception]` - emitted when an exception has been raised.
* Measurement: `%{duration: native_time}`
* Metadata: `%{kind: Exception.kind(), reason: term(), stacktrace: Exception.stacktrace()}`
## Legacy Telemetry Events
* `[:tesla, :request]` - This event is emitted for backwards compatibility only and should be considered deprecated.
This event can be disabled by setting `config :tesla, Tesla.Middleware.Telemetry, disable_legacy_event: true` in your config. Be sure to run `mix deps.compile --force tesla` after changing this setting to ensure the change is picked up.
Please check the [telemetry](https://hexdocs.pm/telemetry/) for the further usage.
"""
@disable_legacy_event Application.get_env(:tesla, Tesla.Middleware.Telemetry,
disable_legacy_event: false
)[:disable_legacy_event]
@behaviour Tesla.Middleware
@impl Tesla.Middleware
def call(env, next, _opts) do
start_time = System.monotonic_time()
emit_start(%{env: env})
try do
Tesla.run(env, next)
catch
kind, reason ->
stacktrace = System.stacktrace()
duration = System.monotonic_time() - start_time
emit_exception(duration, %{kind: kind, reason: reason, stacktrace: stacktrace})
:erlang.raise(kind, reason, stacktrace)
else
{:ok, env} = result ->
duration = System.monotonic_time() - start_time
emit_stop(duration, %{env: env})
emit_legacy_event(duration, result)
result
{:error, reason} = result ->
duration = System.monotonic_time() - start_time
emit_stop(duration, %{env: env, error: reason})
emit_legacy_event(duration, result)
result
end
end
defp emit_start(metadata) do
:telemetry.execute(
[:tesla, :request, :start],
%{system_time: System.system_time()},
metadata
)
end
defp emit_stop(duration, metadata) do
:telemetry.execute(
[:tesla, :request, :stop],
%{duration: duration},
metadata
)
end
defp emit_legacy_event(duration, result) do
if !@disable_legacy_event do
duration_µs = System.convert_time_unit(duration, :native, :microsecond)
+
:telemetry.execute(
[:tesla, :request],
%{request_time: duration_µs},
%{result: result}
)
end
end
defp emit_exception(duration, metadata) do
:telemetry.execute(
[:tesla, :request, :exception],
%{duration: duration},
metadata
)
end
end
end

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