Raindrops::Middleware
is Rack middleware that allows snapshotting current activity from an HTTP request. For all operating systems, it returns at least the following fields:
calling - the number of application dispatchers on your machine
writing - the number of clients being written to on your machine
Additional fields are available for Linux users.
It should be loaded at the top of Rack middleware stack before other middlewares for maximum accuracy.
If you're using preload_app=false (the default) in your Rainbows!/Unicorn config file, you'll need to create the global Stats
object before forking.
require 'raindrops' $stats ||= Raindrops::Middleware::Stats.new
In your Rack config.ru:
use Raindrops::Middleware, :stats => $stats
If you're using preload_app=true in your Rainbows!/Unicorn config file, just add the middleware to your stack:
In your Rack config.ru:
use Raindrops::Middleware
To get bound listener statistics under Linux, you need to specify the listener names for your server. You can even include listen sockets for other servers on the same machine. This can be handy for monitoring your nginx proxy as well.
In your Rack config.ru, just pass the :listeners argument as an array of strings (along with any other arguments). You can specify any combination of TCP or Unix domain socket names:
use Raindrops::Middleware, :listeners => %w(0.0.0.0:80 /tmp/.sock)
If you're running Unicorn 0.98.0 or later, you don't have to pass in the :listeners array, Raindrops
will automatically detect the listeners used by Unicorn master process. This does not detect listeners in different processes, of course.
The response body includes the following stats for each listener (see also Raindrops::ListenStats
):
active - total number of active clients on that listener
queued - total number of queued (pre-accept()) clients on that listener
There is a server running this middleware (and Watcher) at
https://yhbt.net/raindrops-demo/_raindrops
Also check out the Watcher demo at yhbt.net/raindrops-demo/
The demo server is only limited to 30 users, so be sure not to abuse it by using the /tail/ endpoint too much.
A Raindrops::Struct
used to count the number of :calling and :writing clients. This struct is intended to be shared across multiple processes and both counters are updated atomically.
This is supported on all operating systems supported by Raindrops
new (app, opts = {}) source
app
may be any Rack application, this middleware wraps it. opts
is a hash that understands the following members:
:stats - Raindrops::Middleware::Stats
struct (default: Stats.new)
:path - HTTP endpoint used for reading the stats (default: "/_raindrops")
:listeners - array of host:port or socket paths (default: from Unicorn)
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