Cloud PubSub Client - Class PubSubClient (2.4.0)

Reference documentation and code samples for the Cloud PubSub Client class PubSubClient.

Google Cloud Pub/Sub allows you to send and receive messages between independent applications. Find more information at the Google Cloud Pub/Sub docs.

To enable the Google Cloud Pub/Sub Emulator, set the PUBSUB_EMULATOR_HOST environment variable.

This client supports transport over REST or gRPC.

In order to enable gRPC support please make sure to install and enable the gRPC extension through PECL:

$ pecl install grpc

NOTE: Support for gRPC is currently at an Alpha quality level, meaning it is still a work in progress and is more likely to get backwards-incompatible updates.

When using gRPC in production environments, it is highly recommended that you make use of the Protobuf PHP extension for improved performance. Protobuf can be installed via PECL.

$ pecl install protobuf

Example:

use Google\Cloud\PubSub\PubSubClient;

$pubsub = new PubSubClient(['projectId' => 'my-project']);

// Using the Pub/Sub Emulator
use Google\Cloud\PubSub\PubSubClient;

// Be sure to use the port specified when starting the emulator.
// `8900` is used as an example only.
putenv('PUBSUB_EMULATOR_HOST=localhost:8900');

$pubsub = new PubSubClient(['projectId' => 'my-project']);

Namespace

Google \ Cloud \ PubSub

Methods

__construct

Create a PubSub client.

Parameters
Name Description
config array

Configuration Options.
↳ apiEndpoint string

The hostname with optional port to use in place of the default service endpoint. Example: foobar.com or foobar.com:1234.
↳ projectId string

The project ID from the Google Developer's Console.
↳ authCache CacheItemPoolInterface

A cache for storing access tokens. Defaults to a simple in memory implementation.
↳ authCacheOptions array

Cache configuration options.
↳ authHttpHandler callable

A handler used to deliver Psr7 requests specifically for authentication.
↳ credentialsFetcher FetchAuthTokenInterface

A credentials fetcher instance.
↳ httpHandler callable

A handler used to deliver Psr7 requests. Only valid for requests sent over REST.
↳ keyFile array

The contents of the service account credentials .json file retrieved from the Google Developer's Console. Ex: json_decode(file_get_contents($path), true).
↳ keyFilePath string

The full path to your service account credentials .json file retrieved from the Google Developers Console.
↳ requestTimeout float

Seconds to wait before timing out the request. Defaults to 0 with REST and 60 with gRPC.
↳ retries int

Number of retries for a failed request. Defaults to 3.
↳ scopes array

Scopes to be used for the request.
↳ quotaProject string

Specifies a user project to bill for access charges associated with the request.
↳ transport string

The transport type used for requests. May be either grpc or rest. Defaults to grpc if gRPC support is detected on the system.

createTopic

See also:

Parameters
Name Description
name string

The topic name
options array

[optional] Configuration Options. For available configuration options, refer to Google\Cloud\PubSub\Topic::create() { @type bool $enableCompression Flag to enable compression of messages before publishing. Set the flag to true to enable compression. Defaults to false. Messsages are compressed if their total size >= compressionBytesThreshold, whose default value has been experimentally derived after performance evaluations. @type int $compressionBytesThreshold The threshold byte size above which messages are compressed. This only takes effect if enableCompression is set to true. Defaults to 240. (This value is experiementally derived after performance evaluations.) }.
Returns
Type Description
Google\Cloud\PubSub\Topic

topic

Lazily instantiate a topic with a topic name.

No API requests are made by this method. If you want to create a new topic, use Google\Cloud\PubSub\Topic::createTopic().

Example:

// No API request yet!
$topic = $pubsub->topic('my-new-topic');

// This will execute an API call.
echo $topic->info()['name']; // `projects/my-awesome-project/topics/my-new-topic`
Parameters
Name Description
name string

The topic name
options array

[optional] Configuration Options { @type bool $enableCompression Flag to enable compression of messages before publishing. Set the flag to true to enable compression. Defaults to false. Messsages are compressed if their total size >= compressionBytesThreshold, whose default value has been experimentally derived after performance evaluations. @type int $compressionBytesThreshold The threshold byte size above which messages are compressed. This only takes effect if enableCompression is set to true. Defaults to 240. (This value is experiementally derived after performance evaluations.) }
Returns
Type Description
Google\Cloud\PubSub\Topic

topics

See also:

Parameters
Name Description
options array

Configuration Options
↳ pageSize int

Maximum number of results to return per request.
↳ resultLimit int

Limit the number of results returned in total. Defaults to 0 (return all results).
↳ pageToken string

A previously-returned page token used to resume the loading of results from a specific point.
Returns
Type Description
Google\Cloud\Core\Iterator\ItemIterator<\google\cloud\pubsub\topic>

subscribe

See also:

Parameters
Name Description
name string

A subscription name
topic Google\Cloud\PubSub\Topic|string

The topic to which the new subscription will be subscribed.
options array

[optional] Please see Google\Cloud\PubSub\Subscription::create() for configuration details.
Returns
Type Description
Google\Cloud\PubSub\Subscription

subscription

Lazily instantiate a subscription with a subscription name.

This method will NOT perform any API calls. If you wish to create a new subscription, use Google\Cloud\PubSub\PubSubClient::subscribe().

Unless you are sure the subscription exists, you should check its existence before using it.

Example:

$subscription = $pubsub->subscription('my-new-subscription');
Parameters
Name Description
name string

The subscription name
topicName string

[optional] The topic name
Returns
Type Description
Google\Cloud\PubSub\Subscription

subscriptions

See also:

Parameters
Name Description
options array

Configuration Options
↳ pageSize int

Maximum number of results to return per request.
↳ resultLimit int

Limit the number of results returned in total. Defaults to 0 (return all results).
↳ pageToken string

A previously-returned page token used to resume the loading of results from a specific point.
Returns
Type Description
Google\Cloud\Core\Iterator\ItemIterator<\google\cloud\pubsub\subscription>

createSnapshot

Create a snapshot.

Please note that this method may not yet be available in your project.

Example:

$subscription = $pubsub->subscription($subscriptionName);
$snapshot = $pubsub->createSnapshot('my-snapshot', $subscription);
Parameters
Name Description
name string

The snapshot name.
subscription Google\Cloud\PubSub\Subscription

The subscription to take a snapshot of.
options array

[optional] Configuration options.
Returns
Type Description
Google\Cloud\PubSub\Snapshot

snapshot

Lazily create a snapshot instance.

Example:

$snapshot = $pubsub->snapshot('my-snapshot');
Parameters
Name Description
name string

The snapshot name.
info array

[optional] Snapshot info.
Returns
Type Description
Google\Cloud\PubSub\Snapshot

snapshots

Get a list of the snapshots in the project.

Please note that this method may not yet be available in your project.

Example:

$snapshots = $pubsub->snapshots();
foreach ($snapshots as $snapshot) {
     $info = $snapshot->info();
     echo $info['name'];
}
Parameters
Name Description
options array

Configuration Options
↳ pageSize int

Maximum number of results to return per request.
↳ resultLimit int

Limit the number of results returned in total. Defaults to 0 (return all results).
↳ pageToken string

A previously-returned page token used to resume the loading of results from a specific point.
Returns
Type Description
Google\Cloud\Core\Iterator\ItemIterator<\google\cloud\pubsub\snapshot>

schema

Lazily instantiate a schema object.

Example:

$schema = $pubsub->schema('my-schema');
Parameters
Name Description
schemaId string

The schema ID. Must exist in the current project.
info array

[optional] The schema resource info.
Returns
Type Description
Google\Cloud\PubSub\Schema

createSchema

See also:

Parameters
Name Description
schemaId string

The desired schema ID.
type string

The schema type. Allowed values are AVRO and PROTOCOL_BUFFER.
definition string

The definition of the schema. This should contain a string representing the full definition of the schema that is a valid schema definition of the type specified in type. See Schema for details.
options array

[optional] Configuration options
Returns
Type Description
Google\Cloud\PubSub\Schema

schemas

See also:

Parameters
Name Description
options array

Configuration Options
↳ view string

The set of Schema fields to return in the response. If not set, returns Schemas with name and type, but not definition. Set to FULL to retrieve all fields. For allowed values, use constants defined on Google\Cloud\PubSub\V1\SchemaView.
↳ pageSize int

Maximum number of results to return per request.
↳ resultLimit int

Limit the number of results returned in total. Defaults to 0 (return all results).
↳ pageToken string

A previously-returned page token used to resume the loading of results from a specific point.
Returns
Type Description
Google\Cloud\Core\Iterator\ItemIterator<\google\cloud\pubsub\schema>

validateSchema

See also:

Parameters
Name Description
schema array

The schema to validate. See Schema for available parameters.
options array

[optional] Configuration options
Returns
Type Description
void

validateMessage

See also:

Parameters
Name Description
schema Google\Cloud\PubSub\Schema|string|array

The schema to validate against. If a string is given, it should be a fully-qualified schema name, e.g. projects/my-project/schemas/my-schema. If an instance of Google\Cloud\PubSub\Schema is provided, it must exist in the current project. If an array is given, see Schema for definition. The array representation allows for validation of messages using ad-hoc schema; these do not have to exist in the current project in order to be used for validation.
message string

The base64 encoded message to validate.
encoding string

Either JSON or BINARY.
options array

[optional] Configuration options
Returns
Type Description
void

consume

Consume an incoming message and return a PubSub Message.

This method is for use with push delivery only.

Example:

$httpPostRequestBody = file_get_contents('php://input');
$requestData = json_decode($httpPostRequestBody, true);

$message = $pubsub->consume($requestData);
Parameter
Name Description
requestData array
Returns
Type Description
Google\Cloud\PubSub\Message

timestamp

Create a Timestamp object.

Example:

$timestamp = $pubsub->timestamp(new \DateTime('2003-02-05 11:15:02.421827Z'));
Parameters
Name Description
timestamp DateTimeInterface
nanoSeconds int

[optional] The number of nanoseconds in the timestamp.
Returns
Type Description
Google\Cloud\Core\Timestamp

duration

Create a Duration object.

Example:

$duration = $pubsub->duration(100, 00001);
Parameters
Name Description
seconds int

The number of seconds in the duration.
nanos int

[optional] The number of nanoseconds in the duration. Defaults to 0.
Returns
Type Description
Google\Cloud\Core\Duration

__debugInfo

Constants

VERSION

Value: '2.4.0'

FULL_CONTROL_SCOPE

Value: 'https://www.googleapis.com/auth/pubsub'