92 lines
2.3 KiB
Elixir
92 lines
2.3 KiB
Elixir
defmodule OpentelemetryRedix do
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@moduledoc """
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OpentelemetryRedix uses [telemetry](https://hexdocs.pm/telemetry/) handlers to
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create `OpenTelemetry` spans.
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## Usage
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In your application start:
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def start(_type, _args) do
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OpentelemetryRedix.setup()
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# ...
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end
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"""
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alias OpentelemetryRedix.Command
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alias OpentelemetryRedix.ConnectionTracker
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require OpenTelemetry.Tracer
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@typedoc "Setup options"
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@type opts :: []
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@doc """
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Initializes and configures the telemetry handlers.
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"""
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@spec setup(opts()) :: :ok
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def setup(_opts \\ []) do
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:telemetry.attach(
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{__MODULE__, :pipeline_stop},
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[:redix, :pipeline, :stop],
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&__MODULE__.handle_pipeline_stop/4,
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:no_config
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)
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end
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@doc false
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def handle_pipeline_stop(_event, measurements, meta, _config) do
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duration = measurements.duration
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end_time = :opentelemetry.timestamp()
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start_time = end_time - duration
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operation =
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case meta.commands do
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[[operation | _args]] -> operation
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_pipeline -> "pipeline"
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end
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statement = Enum.map_join(meta.commands, "\n", &Command.sanitize/1)
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connection = ConnectionTracker.get_connection(meta.connection)
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attributes =
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%{
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"db.system": "redis",
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"db.operation": operation,
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"db.statement": statement
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}
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|> Map.merge(net_attributes(connection))
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|> Map.merge(redix_attributes(meta))
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s =
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OpenTelemetry.Tracer.start_span(operation, %{
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start_time: start_time,
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kind: :client,
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attributes: attributes
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})
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if meta[:kind] == :error do
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OpenTelemetry.Span.set_status(s, OpenTelemetry.status(:error, format_error(meta.reason)))
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end
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OpenTelemetry.Span.end_span(s)
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end
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defp net_attributes(%{address: address}) when is_binary(address) do
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[host, port] = address |> String.split(":")
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%{"net.peer.name": host, "net.peer.port": port}
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end
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defp net_attributes(_), do: %{}
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defp redix_attributes(%{connection_name: nil}), do: %{}
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defp redix_attributes(%{connection_name: name}), do: %{"db.redix.connection_name": name}
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defp redix_attributes(_), do: %{}
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defp format_error(%{__exception__: true} = exception), do: Exception.message(exception)
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defp format_error(reason), do: inspect(reason)
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end
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