aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/php/lib/Grpc/BaseStub.php
blob: 36d94cae2c90ce1d2a9b6ce52eee0423d128a17e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
<?php
/*
 *
 * Copyright 2015, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

namespace Grpc;

/**
 * Base class for generated client stubs. Stub methods are expected to call
 * _simpleRequest or _streamRequest and return the result.
 */
class BaseStub
{
    private $hostname;
    private $hostname_override;
    private $channel;

    // a callback function
    private $update_metadata;

    /**
     * @param $hostname string
     * @param $opts array
     *  - 'update_metadata': (optional) a callback function which takes in a
     * metadata array, and returns an updated metadata array
     *  - 'grpc.primary_user_agent': (optional) a user-agent string
     * @param $channel Channel An already created Channel object
     */
    public function __construct($hostname, $opts, $channel = null)
    {
        $ssl_roots = file_get_contents(
            dirname(__FILE__).'/../../../../etc/roots.pem');
        ChannelCredentials::setDefaultRootsPem($ssl_roots);

        $this->hostname = $hostname;
        $this->update_metadata = null;
        if (isset($opts['update_metadata'])) {
            if (is_callable($opts['update_metadata'])) {
                $this->update_metadata = $opts['update_metadata'];
            }
            unset($opts['update_metadata']);
        }
        $package_config = json_decode(
            file_get_contents(dirname(__FILE__).'/../../composer.json'), true);
        if (!empty($opts['grpc.primary_user_agent'])) {
            $opts['grpc.primary_user_agent'] .= ' ';
        } else {
            $opts['grpc.primary_user_agent'] = '';
        }
        if (!empty($opts['grpc.ssl_target_name_override'])) {
            $this->hostname_override = $opts['grpc.ssl_target_name_override'];
        }
        $opts['grpc.primary_user_agent'] .=
            'grpc-php/'.$package_config['version'];
        if (!array_key_exists('credentials', $opts)) {
            throw new \Exception("The opts['credentials'] key is now ".
                                 'required. Please see one of the '.
                                 'ChannelCredentials::create methods');
        }
        if ($channel) {
            if (!is_a($channel, 'Channel')) {
                throw new \Exception('The channel argument is not a'.
                                     'Channel object');
            }
            $this->channel = $channel;
        } else {
            $this->channel = new Channel($hostname, $opts);
        }
    }

    /**
     * @return string The URI of the endpoint.
     */
    public function getTarget()
    {
        return $this->channel->getTarget();
    }

    /**
     * @param $try_to_connect bool
     *
     * @return int The grpc connectivity state
     */
    public function getConnectivityState($try_to_connect = false)
    {
        return $this->channel->getConnectivityState($try_to_connect);
    }

    /**
     * @param int $timeout in microseconds
     *
     * @return bool true if channel is ready
     * @throw Exception if channel is in FATAL_ERROR state
     */
    public function waitForReady($timeout)
    {
        $new_state = $this->getConnectivityState(true);
        if ($this->_checkConnectivityState($new_state)) {
            return true;
        }

        $now = Timeval::now();
        $delta = new Timeval($timeout);
        $deadline = $now->add($delta);

        while ($this->channel->watchConnectivityState($new_state, $deadline)) {
            // state has changed before deadline
            $new_state = $this->getConnectivityState();
            if ($this->_checkConnectivityState($new_state)) {
                return true;
            }
        }
        // deadline has passed
        $new_state = $this->getConnectivityState();

        return $this->_checkConnectivityState($new_state);
    }

    private function _checkConnectivityState($new_state)
    {
        if ($new_state == \Grpc\CHANNEL_READY) {
            return true;
        }
        if ($new_state == \Grpc\CHANNEL_FATAL_FAILURE) {
            throw new \Exception('Failed to connect to server');
        }

        return false;
    }

    /**
     * Close the communication channel associated with this stub.
     */
    public function close()
    {
        $this->channel->close();
    }

    /**
     * constructs the auth uri for the jwt.
     */
    private function _get_jwt_aud_uri($method)
    {
        $last_slash_idx = strrpos($method, '/');
        if ($last_slash_idx === false) {
            throw new \InvalidArgumentException(
                'service name must have a slash');
        }
        $service_name = substr($method, 0, $last_slash_idx);

        if ($this->hostname_override) {
            $hostname = $this->hostname_override;
        } else {
            $hostname = $this->hostname;
        }

        return 'https://'.$hostname.$service_name;
    }

    /**
     * validate and normalize the metadata array.
     *
     * @param array $metadata The metadata map
     *
     * @return $metadata Validated and key-normalized metadata map
     * @throw InvalidArgumentException if key contains invalid characters
     */
    private function _validate_and_normalize_metadata($metadata)
    {
        $metadata_copy = [];
        foreach ($metadata as $key => $value) {
            if (!preg_match('/^[A-Za-z\d_-]+$/', $key)) {
                throw new \InvalidArgumentException(
                    'Metadata keys must be nonempty strings containing only '.
                    'alphanumeric characters, hyphens and underscores');
            }
            $metadata_copy[strtolower($key)] = $value;
        }

        return $metadata_copy;
    }

    /* This class is intended to be subclassed by generated code, so
     * all functions begin with "_" to avoid name collisions. */

    /**
     * Call a remote method that takes a single argument and has a
     * single output.
     *
     * @param string   $method      The name of the method to call
     * @param mixed    $argument    The argument to the method
     * @param callable $deserialize A function that deserializes the response
     * @param array    $metadata    A metadata map to send to the server
     *
     * @return SimpleSurfaceActiveCall The active call object
     */
    public function _simpleRequest($method,
                                   $argument,
                                   $deserialize,
                                   $metadata = [],
                                   $options = [])
    {
        $call = new UnaryCall($this->channel,
                              $method,
                              $deserialize,
                              $options);
        $jwt_aud_uri = $this->_get_jwt_aud_uri($method);
        if (is_callable($this->update_metadata)) {
            $metadata = call_user_func($this->update_metadata,
                                        $metadata,
                                        $jwt_aud_uri);
        }
        $metadata = $this->_validate_and_normalize_metadata(
            $metadata);
        $call->start($argument, $metadata, $options);

        return $call;
    }

    /**
     * Call a remote method that takes a stream of arguments and has a single
     * output.
     *
     * @param string   $method      The name of the method to call
     * @param array    $arguments   An array or Traversable of arguments to stream to the
     *     server
     * @param callable $deserialize A function that deserializes the response
     * @param array    $metadata    A metadata map to send to the server
     *
     * @return ClientStreamingSurfaceActiveCall The active call object
     */
    public function _clientStreamRequest($method,
                                         callable $deserialize,
                                         $metadata = [],
                                         $options = [])
    {
        $call = new ClientStreamingCall($this->channel,
                                        $method,
                                        $deserialize,
                                        $options);
        $jwt_aud_uri = $this->_get_jwt_aud_uri($method);
        if (is_callable($this->update_metadata)) {
            $metadata = call_user_func($this->update_metadata,
                                        $metadata,
                                        $jwt_aud_uri);
        }
        $metadata = $this->_validate_and_normalize_metadata(
            $metadata);
        $call->start($metadata);

        return $call;
    }

    /**
     * Call a remote method that takes a single argument and returns a stream of
     * responses.
     *
     * @param string   $method      The name of the method to call
     * @param mixed    $argument    The argument to the method
     * @param callable $deserialize A function that deserializes the responses
     * @param array    $metadata    A metadata map to send to the server
     *
     * @return ServerStreamingSurfaceActiveCall The active call object
     */
    public function _serverStreamRequest($method,
                                         $argument,
                                         callable $deserialize,
                                         $metadata = [],
                                         $options = [])
    {
        $call = new ServerStreamingCall($this->channel,
                                        $method,
                                        $deserialize,
                                        $options);
        $jwt_aud_uri = $this->_get_jwt_aud_uri($method);
        if (is_callable($this->update_metadata)) {
            $metadata = call_user_func($this->update_metadata,
                                        $metadata,
                                        $jwt_aud_uri);
        }
        $metadata = $this->_validate_and_normalize_metadata(
            $metadata);
        $call->start($argument, $metadata, $options);

        return $call;
    }

    /**
     * Call a remote method with messages streaming in both directions.
     *
     * @param string   $method      The name of the method to call
     * @param callable $deserialize A function that deserializes the responses
     * @param array    $metadata    A metadata map to send to the server
     *
     * @return BidiStreamingSurfaceActiveCall The active call object
     */
    public function _bidiRequest($method,
                                 callable $deserialize,
                                 $metadata = [],
                                 $options = [])
    {
        $call = new BidiStreamingCall($this->channel,
                                      $method,
                                      $deserialize,
                                      $options);
        $jwt_aud_uri = $this->_get_jwt_aud_uri($method);
        if (is_callable($this->update_metadata)) {
            $metadata = call_user_func($this->update_metadata,
                                        $metadata,
                                        $jwt_aud_uri);
        }
        $metadata = $this->_validate_and_normalize_metadata(
            $metadata);
        $call->start($metadata);

        return $call;
    }
}