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Editing: GCPCallInvoker.php

<?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 update 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);
    }
}

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