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diff --git a/lib/tesla/middleware/telemetry.ex b/lib/tesla/middleware/telemetry.ex
index e633a51..e282225 100644
--- a/lib/tesla/middleware/telemetry.ex
+++ b/lib/tesla/middleware/telemetry.ex
@@ -1,105 +1,113 @@
if Code.ensure_loaded?(:telemetry) do
defmodule Tesla.Middleware.Telemetry do
@behaviour Tesla.Middleware
@moduledoc """
Emits events using the `:telemetry` library to expose instrumentation.
### Example usage
```
defmodule MyClient do
use Tesla
plug Tesla.Middleware.Telemetry, prefix: [:my_client]
end
:telemetry.attach("my-tesla-telemetry", [:my_client, :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. 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 at the end of the request when there is an error.
* Measurement: `%{duration: native_time}`
* Metadata: `%{env: Tesla.Env.t, reason: term}`
* `[:tesla, :request, :exception]` - emitted at the end of the request when an exception is raised.
* Measurement: `%{duration: native_time}`
* Metadata: `%{env: Tesla.Env.t, exception: Exception.t, stacktrace: Exception.stacktrace}`
+ * `[: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.
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]
+
@doc false
def call(env, next, opts) do
prefix = Keyword.get(opts, :event_prefix, [])
start_time = System.monotonic_time()
emit_start(env, start_time, prefix)
result =
try do
Tesla.run(env, next)
rescue
e ->
stacktrace = System.stacktrace()
metadata = %{env: env, exception: e, stacktrace: stacktrace}
:telemetry.execute(
prefix ++ [:tesla, :request, :exception],
%{duration: System.monotonic_time() - start_time},
metadata
)
reraise e, stacktrace
end
emit_stop(result, start_time, prefix, env)
result
end
defp emit_start(env, start_time, prefix) do
:telemetry.execute(prefix ++ [:tesla, :request, :start], %{time: start_time}, %{
env: env
})
end
defp emit_stop(result, start_time, prefix, req_env) do
duration = System.monotonic_time() - start_time
case result do
{:ok, env} ->
:telemetry.execute(
prefix ++ [:tesla, :request, :stop],
%{duration: duration},
%{env: env}
)
{:error, error} ->
:telemetry.execute(
prefix ++ [:tesla, :request, :error],
%{duration: duration},
%{env: req_env, reason: error}
)
end
- # retained for backwards compatibility - remove in 2.0
- :telemetry.execute([:tesla, :request], %{request_time: duration}, %{result: result})
+ 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
diff --git a/test/tesla/middleware/telemetry_test.exs b/test/tesla/middleware/telemetry_test.exs
index 2c2f339..6ab2d47 100644
--- a/test/tesla/middleware/telemetry_test.exs
+++ b/test/tesla/middleware/telemetry_test.exs
@@ -1,102 +1,116 @@
defmodule Tesla.Middleware.TelemetryTest do
use ExUnit.Case, async: true
defmodule Client do
use Tesla
plug Tesla.Middleware.Telemetry
adapter fn env ->
case env.url do
"/telemetry" -> {:ok, env}
"/telemetry_error" -> {:error, :econnrefused}
"/telemetry_exception" -> raise "some exception"
end
end
end
defmodule ClientWithOptions do
use Tesla
plug Tesla.Middleware.Telemetry, event_prefix: [:my_client]
adapter fn env ->
case env.url do
"/telemetry" -> {:ok, env}
end
end
end
setup do
Application.ensure_all_started(:telemetry)
on_exit(fn ->
:telemetry.list_handlers([])
|> Enum.each(&:telemetry.detach(&1.id))
end)
:ok
end
test "accepts options" do
:telemetry.attach("with_opts", [:my_client, :tesla, :request, :stop], &echo_event/4, %{
caller: self()
})
ClientWithOptions.get("/telemetry")
assert_receive {:event, [:my_client, :tesla, :request, :stop], %{duration: time},
%{env: %Tesla.Env{url: "/telemetry", method: :get}}}
end
test "with default options" do
:telemetry.attach("with_default_opts_start", [:tesla, :request, :start], &echo_event/4, %{
caller: self()
})
:telemetry.attach("with_default_opts_stop", [:tesla, :request, :stop], &echo_event/4, %{
caller: self()
})
+ :telemetry.attach("with_default_opts_legacy", [:tesla, :request, :stop], &echo_event/4, %{
+ caller: self()
+ })
+
Client.get("/telemetry")
assert_receive {:event, [:tesla, :request, :start], %{time: time},
%{env: %Tesla.Env{url: "/telemetry", method: :get}}}
assert_receive {:event, [:tesla, :request, :stop], %{duration: time},
%{env: %Tesla.Env{url: "/telemetry", method: :get}}}
end
+ test "legacy_event_emitted_by_default" do
+ :telemetry.attach("with_default_opts_legacy", [:tesla, :request], &echo_event/4, %{
+ caller: self()
+ })
+
+ Client.get("/telemetry")
+
+ assert_receive {:event, [:tesla, :request], %{request_time: time}, %{result: result}}
+ end
+
test "with an error returned" do
:telemetry.attach("with_error", [:tesla, :request, :error], &echo_event/4, %{caller: self()})
Client.get("/telemetry_error")
assert_receive {:event, [:tesla, :request, :error], %{duration: time},
%{
env: %Tesla.Env{url: "/telemetry_error", method: :get},
reason: :econnrefused
}}
end
test "with an exception raised" do
:telemetry.attach("with_exception", [:tesla, :request, :exception], &echo_event/4, %{
caller: self()
})
assert_raise RuntimeError, fn ->
Client.get("/telemetry_exception")
end
assert_receive {:event, [:tesla, :request, :exception], %{duration: time},
%{
env: %Tesla.Env{url: "/telemetry_exception", method: :get},
exception: kind,
stacktrace: stacktrace
}}
end
def echo_event(event, measurements, metadata, config) do
send(config.caller, {:event, event, measurements, metadata})
end
end

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