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<?php
/*
 *
 * Copyright 2018 gRPC authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
namespace Grpc\Gcp;

/**
 * GCPCallInvoker updates the channel pool(GcpExtensionChannel) for
 * each RPC. The idea is:
 * Before the RPC starts, pick a channel from the channel pool:
 *   - if the RPC is bound to a channel, use that channel.
 *   - if the RPC doesn't bound to a channel, use the one with minimum active streams.
 * After the RPC finishes, update the active stream ref count.
 *   - if the RPC is defined as bind, bind the channel with corresponding key like
 *     spanner session name.
 *   - if the RPC is defined as unbind, unbind the channel with the key.
 */
class GCPCallInvoker implements \Grpc\CallInvoker
{
    private $channel;
    private $affinity_conf;

    /**
     * @param array  $affinity_conf Store the affinity config for process each RPC.
     */
    public function __construct($affinity_conf)
    {
        $this->affinity_conf = $affinity_conf;
    }

    /**
     * @param string  $hostname
     * @param array  $opts
     * @return GcpExtensionChannel
     */
    public function createChannelFactory($hostname, $opts)
    {
        if ($this->channel) {
            // $call_invoker object has already created from previews PHP-FPM scripts.
            // Only need to udpate the $opts including the credentials.
            $this->channel->updateOpts($opts);
        } else {
            $opts['affinity_conf'] = $this->affinity_conf;
            $channel = new GcpExtensionChannel($hostname, $opts);
            $this->channel = $channel;
        }
        return $this->channel;
    }

    // _getChannel is used for testing only.
    public function GetChannel()
    {
        return $this->channel;
    }

    public function UnaryCall($channel, $method, $deserialize, $options)
    {
        return new GCPUnaryCall($channel, $method, $deserialize, $options);
    }
    public function ClientStreamingCall($channel, $method, $deserialize, $options)
    {
        return new GCPClientStreamCall($channel, $method, $deserialize, $options);
    }
    public function ServerStreamingCall($channel, $method, $deserialize, $options)
    {
        return new GCPServerStreamCall($channel, $method, $deserialize, $options);
    }
    public function BidiStreamingCall($channel, $method, $deserialize, $options)
    {
        return new GCPBidiStreamingCall($channel, $method, $deserialize, $options);
    }
}

Filemanager

Name Type Size Permission Actions
generated Folder 2755
ChannelRef.php File 3.17 KB 0644
Config.php File 4.23 KB 0644
CreatedByDeserializeCheck.php File 1.62 KB 0644
GCPBidiStreamingCall.php File 3.11 KB 0644
GCPCallInvoker.php File 2.89 KB 0644
GCPClientStreamCall.php File 2.38 KB 0644
GCPServerStreamCall.php File 2.72 KB 0644
GCPUnaryCall.php File 2.13 KB 0644
GcpBaseCall.php File 6.58 KB 0644
GcpExtensionChannel.php File 10.04 KB 0644
grpc_gcp.proto File 2.53 KB 0644