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diff --git a/lib/tesla/middleware/telemetry.ex b/lib/tesla/middleware/telemetry.ex
index a2fcbb9..8f3975c 100644
--- a/lib/tesla/middleware/telemetry.ex
+++ b/lib/tesla/middleware/telemetry.ex
@@ -1,114 +1,114 @@
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 ->
+ :telemetry.attach("my-tesla-telemetry", [:tesla, :request, :stop], fn event, measurements, meta, config ->
# Do something with the event
end)
```
## Options
* `:event_prefix` - a list of atoms to prefix to the telemetry event name. This can be set if you need to distinguish events from different clients. Defaults to `[]`
## Telemetry Events
* `[:tesla, :request, :start]` - emitted at the beginning of the request.
* Measurement: `%{time: System.monotonic_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}`
* `[:tesla, :request, :error]` - emitted when there is an error.
* Measurement: `%{value: 1}`
* Metadata: `%{env: Tesla.Env.t, kind: Exception.kind | nil, 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
prefix = Keyword.get(opts, :event_prefix, [])
start_time = System.monotonic_time()
emit_start(env, start_time, prefix)
try do
Tesla.run(env, next)
catch
kind, reason ->
stacktrace = System.stacktrace()
metadata = %{env: env, kind: kind, reason: reason, stacktrace: stacktrace}
:telemetry.execute(
prefix ++ [:tesla, :request, :error],
%{value: 1},
metadata
)
emit_stop(env, start_time, prefix, {:error, reason})
:erlang.raise(kind, reason, stacktrace)
else
{:ok, env} = result ->
emit_stop(env, start_time, prefix, result)
result
{:error, error} = result ->
:telemetry.execute(
prefix ++ [:tesla, :request, :error],
%{value: 1},
%{env: env, kind: nil, reason: error, stacktrace: []}
)
emit_stop(env, start_time, prefix, result)
result
end
end
defp emit_start(env, start_time, prefix) do
:telemetry.execute(prefix ++ [:tesla, :request, :start], %{time: start_time}, %{
env: env
})
end
defp emit_stop(env, start_time, prefix, result) do
duration = System.monotonic_time() - start_time
:telemetry.execute(
prefix ++ [:tesla, :request, :stop],
%{duration: duration},
%{env: env}
)
if !@disable_legacy_event do
# retained for backwards compatibility - remove in 2.0
:telemetry.execute([:tesla, :request], %{request_time: duration}, %{result: result})
end
end
end
end

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