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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;
abstract class GcpBaseCall
{
const BOUND = 'BOUND';
const UNBIND = 'UNBIND';
const BIND = 'BIND';
protected $gcp_channel;
// It has the Grpc\Channel and related ref_count information for this RPC.
protected $channel_ref;
// If this RPC is 'UNBIND', use it instead of the one from response.
protected $affinity_key;
// Array of [affinity_key, command]
protected $_affinity;
// Information needed to create Grpc\Call object when the RPC starts.
protected $method;
protected $argument;
protected $metadata;
protected $options;
protected $deserialize;
// In GCP extension, it is when a RPC calls "start", we pick a channel.
// Thus we need to save the $me
protected $metadata_rpc = array();
// first_rpc is used to check whether the first request is sent for client
// streaming RPC.
protected $has_real_call = null;
protected $real_call;
/**
* Create a new Call wrapper object.
*
* @param Channel $channel The channel to communicate on
* @param string $method The method to call on the
* remote server
* @param callback $deserialize A callback function to deserialize
* the response
* @param array $options Call options (optional)
*/
public function __construct($channel, $method, $deserialize, $options)
{
$this->gcp_channel = $channel;
$this->method = $method;
$this->deserialize = $deserialize;
$this->options = $options;
$this->_affinity = null;
if (isset($this->gcp_channel->affinity_conf['affinity_by_method'][$method])) {
$this->_affinity = $this->gcp_channel->affinity_conf['affinity_by_method'][$method];
}
}
/**
* Pick a ChannelRef from the channel pool based on the request and
* the affinity config.
*
* @param mixed $argument Requests.
*
* @return ChannelRef
*/
protected function _rpcPreProcess($argument)
{
$this->affinity_key = null;
if ($this->_affinity) {
$command = $this->_affinity['command'];
if ($command == self::BOUND || $command == self::UNBIND) {
$this->affinity_key = $this->getAffinityKeyFromProto($argument);
}
}
$this->channel_ref = $this->gcp_channel->getChannelRef($this->affinity_key);
$this->channel_ref->activeStreamRefIncr();
return $this->channel_ref;
}
/**
* Update ChannelRef when RPC finishes.
*
* @param \stdClass $status The status object, with integer $code, string
* $details, and array $metadata members
* @param mixed $response Response.
*/
protected function _rpcPostProcess($status, $response)
{
if ($this->_affinity) {
$command = $this->_affinity['command'];
if ($command == self::BIND) {
if ($status->code != \Grpc\STATUS_OK) {
return;
}
$affinity_key = $this->getAffinityKeyFromProto($response);
$this->gcp_channel->bind($this->channel_ref, $affinity_key);
} elseif ($command == self::UNBIND) {
$this->gcp_channel->unbind($this->affinity_key);
}
}
$this->channel_ref->activeStreamRefDecr();
}
/**
* Get the affinity key based on the affinity config.
*
* @param mixed $proto Objects may contain the affinity key.
*
* @return string Affinity key.
*/
protected function getAffinityKeyFromProto($proto)
{
if ($this->_affinity) {
$names = $this->_affinity['affinityKey'];
$names_arr = explode(".", $names);
foreach ($names_arr as $name) {
$getAttrMethod = 'get' . ucfirst($name);
$proto = call_user_func_array(array($proto, $getAttrMethod), array());
}
return $proto;
}
echo "Cannot find the field in the proto\n";
}
/**
* @return mixed The metadata sent by the server
*/
public function getMetadata()
{
if (!$this->has_real_call) {
$this->createRealCall();
$this->has_real_call = true;
}
return $this->real_call->getMetadata();
}
/**
* @return mixed The trailing metadata sent by the server
*/
public function getTrailingMetadata()
{
if (!$this->has_real_call) {
$this->createRealCall();
$this->has_real_call = true;
}
return $this->real_call->getTrailingMetadata();
}
/**
* @return string The URI of the endpoint
*/
public function getPeer()
{
if (!$this->has_real_call) {
$this->createRealCall();
$this->has_real_call = true;
}
return $this->real_call->getPeer();
}
/**
* Cancels the call.
*/
public function cancel()
{
if (!$this->has_real_call) {
$this->has_real_call = true;
$this->createRealCall();
}
$this->real_call->cancel();
}
/**
* Serialize a message to the protobuf binary format.
*
* @param mixed $data The Protobuf message
*
* @return string The protobuf binary format
*/
protected function _serializeMessage($data)
{
return $this->real_call->_serializeMessage($data);
}
/**
* Deserialize a response value to an object.
*
* @param string $value The binary value to deserialize
*
* @return mixed The deserialized value
*/
protected function _deserializeResponse($value)
{
return $this->real_call->_deserializeResponse($value);
}
/**
* Set the CallCredentials for the underlying Call.
*
* @param CallCredentials $call_credentials The CallCredentials object
*/
public function setCallCredentials($call_credentials)
{
$this->call->setCredentials($call_credentials);
}
}
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