NAME

Mojo::Graphite::Writer - A non-blocking Graphite metric writer using
the Mojo stack

SYNOPSIS

my $graphite = Mojo::Graphite::Writer->new(address => 'graphite.myhost.com');
my $time = time;
$graphite->write(
"my.metric.one 1 $time",
"my.metric.two 2 $time",
...
);

DESCRIPTION

Mojo::Graphite::Writer is a non-blocking client for feeding data to the
Graphite metrics collector. This simple module is meant to aid in
batching and queuing writes to the server.

This is still a work-in-progress, however the author uses it in work
applications so every effort will be made to keep the api reasonably
stable while improving where possible.

ATTRIBUTES

Mojo::Graphite::Writer inherits all attributes from Mojo::Base and
implements the following new ones.

address

Address of the target Graphite server. Required.

batch_size

The number of metrics to send in each write batch. Default is 100.

port

Port of the target Graphite server. Default is 2003.

METHODS

Mojo::Graphite::Writer inherits all methods from Mojo::Base and
implements the following new ones.

Close the current connection to "address".

connect

Open a new connection to "address":"port" using "client" in
Mojo::IOLoop. Any additional arguments are passed through to that
method. Returns a Mojo::Promise that resolves with the
Mojo::IOLoop::Stream object of the connection.

Note that if the client is already connected, the promise is resolved
again with the same stream and will until that stream is closed. In
this way, for simple connections, you may simple call "write" while for
more complex ones, you may open the connction using this method with
additional arguments if needed and then call "write" later.

write

Write metrics to the "connect"-ed graphite server. Metrics are queued
and written to the server in a non-blocking way, in the order that
"write" is called.

Metrics are strings of the form path value time as documented as "the
plaintext protocol"
<https://graphite.readthedocs.io/en/latest/feeding-carbon.html#the-plaintext-protocol>.
Each string is one metric. It will be line-ending normalized, no
newline is required. Writes are batched in groups of size "batch_size".

If the writer is not already connected, calling write will implicitly
call "connect".

Returns a Mojo::Promise that will be resolved when the metrics passed
in this write call are written. The promise is rejected if any write in
the write queue fails, even if it is not from the write call.

FUTURE WORK

This module is still in early development. Future work will include

* Passing structures to "write" and handling the formatting

* Possibly a blocking api, though this is questionable