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OpenAPI::Client - A client for talking to an Open API powered server
Contents
Attributes
base_url
$base_url = $client->base_url;
Returns a Mojo::URL object with the base URL to the API. The default value comes from "schemes",
"basePath" and "host" in the OpenAPI v2 specification or from "servers" in the OpenAPI v3 specification.
ua
$ua = $client->ua;
Returns a Mojo::UserAgent object which is used to execute requests.
Copyright And License
Copyright (C) 2017-2021, Jan Henning Thorsen
This program is free software, you can redistribute it and/or modify it under the terms of the Artistic
License version 2.0.
Customization
CustomserverURL
If you want to request a different server than what is specified in the Open API document, you can change
the "base_url":
# Pass on a Mojo::URL object to the constructor
$base_url = Mojo::URL->new("http://example.com");
$client1 = OpenAPI::Client->new("file:///path/to/api.json", base_url => $base_url);
# A plain string will be converted to a Mojo::URL object
$client2 = OpenAPI::Client->new("file:///path/to/api.json", base_url => "http://example.com");
# Change the base_url after the client has been created
$client3 = OpenAPI::Client->new("file:///path/to/api.json");
$client3->base_url->host("other.example.com");
Customcontent
You can send XML or any format you like, but this require you to add a new "generator":
use Your::XML::Library "to_xml";
$client->ua->transactor->add_generator(xml => sub {
my ($t, $tx, $data) = @_;
$tx->req->body(to_xml $data);
return $tx;
});
$client->addHero({}, xml => {name => "Supergirl"});
See Mojo::UserAgent::Transactor for more details.
Description
OpenAPI::Client can generating classes that can talk to an Open API server. This is done by generating a
custom class, based on a Open API specification, with methods that transform parameters into a HTTP
request.
The generated class will perform input validation, so invalid data won't be sent to the server.
Note that this implementation is currently EXPERIMENTAL, but unlikely to change! Feedback is
appreciated.
Events
after_build_tx
$client->on(after_build_tx => sub { my ($client, $tx) = @_ })
This event is emitted after a Mojo::UserAgent::Transactor object has been built, just before it is passed
on to the "ua". Note that all validation has already been run, so alternating the $tx too much, might
cause an invalid request on the server side.
A special "env" in Mojo::Message::Request variable will be set, to reference the operationId:
$tx->req->env->{operationId};
Note that this usage of "env()" is currently EXPERIMENTAL:
Methods
call
$tx = $client->call($operationId => \%params, %content);
$client = $client->call($operationId => \%params, %content, sub { my ($client, $tx) = @_; });
Used to either call an $operationId that has an "invalid name", such as "list pets" instead of "listPets"
or to call an $operationId that you are unsure is supported yet. If it is not, an exception will be
thrown, matching text "No such operationId".
$operationId is the name of the resource defined in the OpenAPI specification
<https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md#operation-object>.
$params is optional, but must be a hash ref, where the keys should match a named parameter in the OpenAPI
specification <https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md#parameter-
object>.
%content is used for the body of the request, where the key need to be either "body" or a matching
"generators" in Mojo::UserAgent::Transactor. Example:
$client->addHero({}, body => "Some data");
$client->addHero({}, json => {name => "Supergirl"});
$tx is a Mojo::Transaction object.
call_p
$promise = $client->call_p($operationId => $params, %content);
$promise->then(sub { my $tx = shift });
As "call" above, but returns a Mojo::Promise object.
new
$client = OpenAPI::Client->new($specification, \%attributes);
$client = OpenAPI::Client->new($specification, %attributes);
Returns an object of a generated class, with methods generated from the Open API specification located at
$specification. See "schema" in JSON::Validator for valid versions of $specification.
Note that the class is cached by perl, so loading a new specification from the same URL will not generate
a new class.
Extra %attributes:
• app
Specifying an "app" is useful when running against a local Mojolicious instance.
• coerce
See "coerce" in JSON::Validator. Default to "booleans,numbers,strings".
validator
$validator = $client->validator;
$validator = $class->validator;
Returns a JSON::Validator::Schema::OpenAPIv2 object for a generated class. Note that this is a global
variable, so changing the object will affect all instances returned by "new".
Name
OpenAPI::Client - A client for talking to an Open API powered server
Synopsis
OpenAPIspecification
The specification given to "new" need to point to a valid OpenAPI document. This document can be OpenAPI
v2.x or v3.x, and it can be in either JSON or YAML format. Example:
openapi: 3.0.1
info:
title: Swagger Petstore
version: 1.0.0
servers:
- url: http://petstore.swagger.io/v1
paths:
/pets:
get:
operationId: listPets
...
"host", "basePath" and the first item in "schemes" will be used to construct "base_url". This can be
altered at any time, if you need to send data to a custom endpoint.
Client
The OpenAPI API specification will be used to generate a sub-class of OpenAPI::Client where the
"operationId", inside of each path definition, is used to generate methods:
use OpenAPI::Client;
$client = OpenAPI::Client->new("file:///path/to/api.json");
# Blocking
$tx = $client->listPets;
# Non-blocking
$client = $client->listPets(sub { my ($client, $tx) = @_; });
# Promises
$promise = $client->listPets_p->then(sub { my $tx = shift });
# With parameters
$tx = $client->listPets({limit => 10});
See Mojo::Transaction for more information about what you can do with the $tx object, but you often just
want something like this:
# Check for errors
die $tx->error->{message} if $tx->error;
# Extract data from the JSON responses
say $tx->res->json->{pets}[0]{name};
Check out "error" in Mojo::Transaction, "req" in Mojo::Transaction and "res" in Mojo::Transaction for
some of the most used methods in that class.
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