Hummingbird

A plug to correlate events between services in two lines of Elixir.

Given appropriate trace headers, ships an event for router and response calls.

This library is under active development

To Use

defmodule YourAppWeb.YourController do
  use YourAppWeb, :controller

  plug(Hummingbird, caller: __MODULE__, service_name: "your_service_name")
end

Configuration

Configure OpenCensus In your config.exs:

# configure opencensus
config :opencensus,
  reporters: [{Opencensus.Honeycomb.Reporter, []}],
  send_interval_ms: 1000

Set the dataset per environment In your dev, prod, exs files:

# configure write key per dataset/environment
# we use environment variables to protect the secret. It doesn't matter how you
# set the value.  Choose your own adventure.

config :opencensus_honeycomb,
  dataset: "your_dataset_name_goes_here",
  write_key: "${HONEYCOMB_WRITE_KEY}"

Assumptions

Currently, it looks for x-b3-spanid and x-b3-traceid headers on incoming request to create the trace.

Current Example

Thanks

Wraps around https://github.com/open-telemetry/opentelemetry-erlang