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appsignal

0.4.0
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Collects error and performance data from your Elixir applications and sends it to AppSignal

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appsignal lib appsignal phoenix.ex
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lib/appsignal/phoenix.ex

defmodule Appsignal.Phoenix do
@moduledoc """
Instrumentation of Phoenix requests
To integrate Appsignal with Phoenix, *use* the `Appsignal.Phoenix` module in
your `endpoint.ex` file, just before your router:
```
use Appsignal.Phoenix
```
This will install a plug which measures request time, and also will
trap common HTTP errors (like 4xx status codes).
"""
require Logger
alias Appsignal.{Transaction,TransactionRegistry}
@doc false
defmacro __using__(_) do
quote do
plug Appsignal.Phoenix.Plug
def call(conn, opts) do
try do
super(conn, opts)
rescue
e ->
import Appsignal.Phoenix
case {Appsignal.TransactionRegistry.lookup(self), extract_error_metadata(e, conn, System.stacktrace)} do
{nil, _} -> :skip
{_, nil} -> :skip
{transaction, {reason, message, stack, conn}} ->
submit_http_error(reason, message, stack, transaction, conn)
end
reraise e, System.stacktrace
end
end
end
end
@doc false
def extract_error_metadata(%Plug.Conn.WrapperError{reason: reason = %{}, conn: conn}, _conn, stack) do
extract_error_metadata(reason, conn, stack)
end
def extract_error_metadata(%{plug_status: s}, _conn, _stack) when s < 500 do
# Do not submit regular HTTP errors which have a status code
nil
end
def extract_error_metadata(r, conn, stack) when is_binary(r) do
extract_error_metadata(RuntimeError.exception(r), conn, stack)
end
def extract_error_metadata(r, conn, stack) when is_atom(r) do
extract_error_metadata(r.exception([]), conn, stack)
end
def extract_error_metadata(%Protocol.UndefinedError{value: {:error, {error = %{}, stack}}}, conn, _stack) do
extract_error_metadata(error, conn, stack)
end
def extract_error_metadata(r = %{}, conn, stack) do
# Submit error
{r.__struct__, Exception.message(r), stack, Map.get(r, :conn, conn)}
end
@doc false
def submit_http_error(reason, message, stack, transaction, conn) do
Transaction.set_error(transaction, "#{inspect reason}", message, Appsignal.ErrorHandler.format_stack(stack))
Transaction.try_set_action(transaction, conn)
if Transaction.finish(transaction) == :sample do
Transaction.set_request_metadata(transaction, conn)
end
Transaction.complete(transaction)
# explicitly remove the transaction here so the regular error handler doesn't submit it again
:ok = TransactionRegistry.remove_transaction(transaction)
Logger.debug("Submitting Phoenix error #{inspect transaction}: #{message}")
end
end