NAME

Paws::Net::MultiplexCaller - Control routing of services to Paws callers

SYNOPSIS

use Paws::Net::MultiplexCaller;
use Paws::Net::LWPCaller;
use Paws::Net::MockCaller;

my $paws = Paws->new(
  config => {
    caller => Paws::Net::MultiplexCaller->new(
      caller_for => {
        SQS => Paws::Net::LWPCaller->new(),
        EC2 => Paws::Net::MockCaller->new(...),
      },
      default_caller => Paws::Net::Caller->new
    )
  }
);

# SQS methods will be called with LWPCaller
# $paws->service('SQS', region => 'eu-west-1')->CreateQueue
# EC2 with the MockCaller
# $paws->service('EC2', region => 'us-east-1')->RunInstances
# others will be called with the default Paws::Net::Caller
# $paws->service('DynamoDB', region => 'us-east-1')->CreateTable 

DESCRIPTION

By default, Paws routes all calls to service methods (RunInstances for EC2 and CreateQueue for SQS, for example) to the configured caller (that normally will do HTTP requests to the backing services). All calls go to the one and only caller.

Paws::Net::MultiplexCaller is one of Paws' pluggable callers whose only purpose is to let you route requests to different callers. So you can do special things like:

Use a special caller for just one service

Emulate services without doing HTTP calls

ATTRIBUTES

Attributes are initialized in the constructor

caller_for

Is a Hashref which keys are the names of the services to route for. It's values are instances of objects that can handle Paws calls (it's pluggable callers). Note that you can pass the same object for different services

my $caller2 = Paws::Net::LWPCaller->new;
my $paws = Paws->new(
  config => {
    caller => Paws::Net::MultiplexCaller->new(
      caller_for => {
        SQS => $caller2,
        EC2 => $caller2,
      },
    )
  }
);

As opposed to

my $paws = Paws->new(
  config => {
    caller => Paws::Net::MultiplexCaller->new(
      caller_for => {
        SQS => Paws::Net::LWPCaller->new,
        EC2 => Paws::Net::LWPCaller->new,
      },
    )
  }
);

Where there would be two independant instances of LWPCaller (consuming double memory), or leading to unexpected results (should the callers track some sort of state, like Paw::Net::MockCaller)

default_caller

If not specified, any call to a service that is not in caller_for will fail to complete, raising an exception.

If specified, Paws will route any service that is not in caller_for to this caller, that should be initialized to an instance of any of Paws' pluggable callers.

Practical use

On CPAN you can find Paws::Kinesis::MemoryCaller, that emulates the AWS Kinesis service. Using that caller will not let you call other AWS services. With Paws::Net::MultiplexCaller we can solve that:

my $paws = Paws->new(
  config => {
    caller => Paws::Net::MultiplexCaller->new(
      caller_for => {
        Kinesis => Paws::Kinesis::MemoryCaller->new(),
      },
      default_caller => Paws::Net::Caller->new
    )
  }
);

You can also combine the multiplex caller with PawsX::FakeImplementation::Instance to easily fake some AWS services for your testing purposes.

AUTHOR

Jose Luis Martinez
CPAN ID: JLMARTIN
CAPSiDE
jlmartinez@capside.com

SEE ALSO

Paws

Paws::Kinesis::MemoryCaller

PawsX::FakeImplementation::Instance

BUGS and SOURCE

The source code is located here: https://github.com/pplu/paws-net-multiplexcaller

Please report bugs to: https://github.com/pplu/paws-net-multiplexcaller/issues

COPYRIGHT and LICENSE

Copyright (c) 2017 by CAPSiDE

This code is distributed under the Apache 2 License. The full text of the license can be found in the LICENSE file included with this module.

cpanm Paws::Net::MultiplexCaller

perl -MCPAN -e shell
install Paws::Net::MultiplexCaller