NAME

LogP6::Writer::StackDriver - writer implementation for local stackdriver logging

SYNOPSIS

Useful for logging within the Google Cloud environment where fluentd will pickup logs and feed them into StackDriver.

Use of this module ensures your messages are treated as single entries (no multi-line issues) and enables use of triggers/calculations on special fields via MDC.

CONFIGURATION

You can configure the writer from code by instantiating object of LogP6::WriterConf::StackDriver class. It takes the following parameters:

name - name of the writer configuration
handle - location to write the json formatted log lines; STDOUT by default.
use-mdc - boolean property. Enabled by default. All content of LogP6 MDC will be passed to stackdriver as json fields.
use-mdc-cro - boolean property. Enabled by default. Will look for and use the CRO request/response objects in the MDC information to fill out various HTTP related fields including requestMethod, requestURL, userAgent, referer, remoteIp, and status.
mdc-key-cro-request - string property. cro-request by default. Tells the logger which field may provide the CRO request object.
mdc-key-cro-response - string property. cro-response by default. Tells the logger which field may provde the CRO response object.
use-source-location - boolean property, True by default. Will include the source location in the log entry. Use of this functionalty may slow down your porgram as it requires a callframe call for each log entry.

EXAMPLE

use LogP6 :configure;   # use library in configure mode
use LogP6::WriterConf::StackDriver;
use Cro::HTTP::Router;

my $sd = LogP6::WriterConf::StackDriver.new(
  :handle($*ERR), # Change to use STDERR
  :name<audit>

  use-source-location => False,  # Disable source location

  mdc-key-cro-request => 'webapp-request',
);

cliche(
  :name<cl>,
  :matcher<audit>,
  grooves => ( writer($sd), filter(:level($debug)) ) # Debug level to $sd
);

my $app = route {
  get -> 'healthz' {

    # Note, any instance of 'audit' log will have the MDC information only in
    # the current Thread. Consider creating a context object for the request
    # and passing it along the work pipeline.
    my $log = get-logger('audit');
    $log.mdc-put('webapp-request', request());
    $log.debug('Request for healthz');

    content 'text/plain', 'READY';
  }
}

$!cro-service = Cro::HTTP::Server.new(:host<0.0.0.0>, :port<10000>, :$app);
$!cro-service.start;

AUTHOR

Rod Taylor rbt@cpan.org

Source can be located at: github. Comments and Pull Requests are welcome.

COPYRIGHT AND LICENSE

This library is free software; you can redistribute it and/or modify it under the Artistic License 2.0.