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<?php |
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|
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/* |
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* |
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* Copyright 2018 gRPC authors. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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* |
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*/ |
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namespace Dudlewebs\WPMCS\Grpc\Gcp; |
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|
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/** |
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* GCPCallInvoker updates the channel pool(GcpExtensionChannel) for |
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* each RPC. The idea is: |
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* Before the RPC starts, pick a channel from the channel pool: |
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* - if the RPC is bound to a channel, use that channel. |
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* - if the RPC doesn't bound to a channel, use the one with minimum active streams. |
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* After the RPC finishes, update the active stream ref count. |
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* - if the RPC is defined as bind, bind the channel with corresponding key like |
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* spanner session name. |
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* - if the RPC is defined as unbind, unbind the channel with the key. |
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*/ |
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class GCPCallInvoker implements \Dudlewebs\WPMCS\Grpc\CallInvoker |
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{ |
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private $channel; |
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private $affinity_conf; |
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/** |
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* @param array $affinity_conf Store the affinity config for process each RPC. |
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*/ |
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public function __construct($affinity_conf) |
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{ |
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$this->affinity_conf = $affinity_conf; |
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} |
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/** |
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* @param string $hostname |
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* @param array $opts |
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* @return GcpExtensionChannel |
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*/ |
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public function createChannelFactory($hostname, $opts) |
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{ |
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if ($this->channel) { |
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// $call_invoker object has already created from previews PHP-FPM scripts. |
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// Only need to update the $opts including the credentials. |
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$this->channel->updateOpts($opts); |
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} else { |
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$opts['affinity_conf'] = $this->affinity_conf; |
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$channel = new GcpExtensionChannel($hostname, $opts); |
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$this->channel = $channel; |
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} |
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return $this->channel; |
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} |
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// _getChannel is used for testing only. |
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public function GetChannel() |
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{ |
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return $this->channel; |
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} |
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public function UnaryCall($channel, $method, $deserialize, $options) |
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{ |
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return new GCPUnaryCall($channel, $method, $deserialize, $options); |
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} |
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public function ClientStreamingCall($channel, $method, $deserialize, $options) |
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{ |
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return new GCPClientStreamCall($channel, $method, $deserialize, $options); |
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} |
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public function ServerStreamingCall($channel, $method, $deserialize, $options) |
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{ |
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return new GCPServerStreamCall($channel, $method, $deserialize, $options); |
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} |
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public function BidiStreamingCall($channel, $method, $deserialize, $options) |
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{ |
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return new GCPBidiStreamingCall($channel, $method, $deserialize, $options); |
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} |
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} |
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