1 /* -----------------------------------------------------------------------
2 * Copyright 2012 Equinox Software, Inc.
3 * Bill Erickson <berick@esilibrary.com>
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 * -----------------------------------------------------------------------
18 * Dumb websocket <-> opensrf gateway. Wrapped opensrf messages are extracted
19 * and relayed to the opensrf network. Responses are pulled from the opensrf
20 * network and passed back to the client. No attempt is made to understand
21 * the contents of the messages.
23 * Messages to/from the websocket client take the following form:
25 * "service" : "opensrf.foo", // required for new sessions (inbound only)
26 * "thread" : "123454321", // AKA thread. required for follow-up requests; max 64 chars.
27 * "log_xid" : "123..32", // optional log trace ID, max 64 chars;
28 * "osrf_msg" : {<osrf_msg>} // required
31 * Each translator operates with two threads. One thread receives messages
32 * from the websocket client, translates, and relays them to the opensrf
33 * network. The second thread collects responses from the opensrf network and
34 * relays them back to the websocket client.
36 * The main thread reads from socket A (apache) and writes to socket B
37 * (openesrf), while the responder thread reads from B and writes to A. The
38 * apr data structures used are threadsafe. For now, no thread mutex's are
41 * Note that with a "thread", which allows us to identify the opensrf session,
42 * the caller does not need to provide a recipient address. The "service" is
43 * only required to start a new opensrf session. After the sesession is
44 * started, all future communication is based solely on the thread.
46 * We use jsonParseRaw and jsonObjectToJSONRaw since this service does not care
47 * about the contents of the messages.
52 * short-timeout mode for brick detachment where inactivity timeout drops way
53 * down for graceful disconnects.
57 #include "apr_strings.h"
58 #include "apr_thread_proc.h"
60 #include "websocket_plugin.h"
61 #include "opensrf/log.h"
62 #include "opensrf/osrf_json.h"
63 #include "opensrf/transport_client.h"
64 #include "opensrf/transport_message.h"
65 #include "opensrf/osrf_system.h"
66 #include "opensrf/osrfConfig.h"
68 #define MAX_THREAD_SIZE 64
69 #define RECIP_BUF_SIZE 128
70 #define WEBSOCKET_TRANSLATOR_INGRESS "ws-translator-v1"
72 typedef struct _osrfWebsocketTranslator {
73 const WebSocketServer *server;
74 apr_pool_t *main_pool; // standalone per-process pool
75 apr_pool_t *session_pool; // child of r->pool; per-session
76 apr_hash_t *session_cache;
77 apr_thread_t *responder_thread;
78 apr_thread_mutex_t *mutex;
82 } osrfWebsocketTranslator;
84 static osrfWebsocketTranslator *trans = NULL;
85 static transport_client *osrf_handle = NULL;
86 static char recipient_buf[RECIP_BUF_SIZE]; // reusable recipient buffer
89 void* osrf_responder_thread_main_body(transport_message *tmsg) {
91 jsonObject *msg_wrapper;
97 // discard responses received after client disconnect
98 if (!trans->client_connected) {
99 osrfLogDebug(OSRF_LOG_MARK,
100 "WS discarding response for thread=%s, xid=%s",
101 tmsg->thread, tmsg->osrf_xid);
105 osrfLogDebug(OSRF_LOG_MARK,
106 "WS received opensrf response for thread=%s, xid=%s",
107 tmsg->thread, tmsg->osrf_xid);
109 // build the wrapper object
110 msg_wrapper = jsonNewObject(NULL);
111 jsonObjectSetKey(msg_wrapper, "thread", jsonNewObject(tmsg->thread));
112 jsonObjectSetKey(msg_wrapper, "log_xid", jsonNewObject(tmsg->osrf_xid));
113 jsonObjectSetKey(msg_wrapper, "osrf_msg", jsonParseRaw(tmsg->body));
115 if (tmsg->is_error) {
117 "WS received jabber error message in response to thread=%s and xid=%s",
118 tmsg->thread, tmsg->osrf_xid);
120 jsonObjectSetKey(msg_wrapper, "transport_error", jsonNewBoolObject(1));
123 msg_string = jsonObjectToJSONRaw(msg_wrapper);
125 // deliver the wrapped message json to the websocket client
126 trans->server->send(trans->server, MESSAGE_TYPE_TEXT,
127 (unsigned char*) msg_string, strlen(msg_string));
129 msg_list = osrfMessageDeserialize(tmsg->body, NULL);
130 for (i = 0; i < msg_list->size; i++) {
131 one_msg = OSRF_LIST_GET_INDEX(msg_list, i);
133 /* if our client just successfully connected to an opensrf service,
134 cache the sender so that future calls on this thread will use
135 the correct recipient.
136 TODO: this cache will grow to add one entry per connected client
137 session. Even when entries are removed, they are not cleaned up
138 until the session_pool is destroyed. We need to ensure that client
139 sessions don't last too long and/or create a last-touched timeout
140 mechanism to periodically remove old entries. */
141 if (one_msg && one_msg->m_type == STATUS &&
142 one_msg->status_code == OSRF_STATUS_OK) {
144 if (!apr_hash_get(trans->session_cache,
145 tmsg->thread, APR_HASH_KEY_STRING)) {
147 osrfLogDebug(OSRF_LOG_MARK,
148 "WS caching sender thread=%s, sender=%s",
149 tmsg->thread, tmsg->sender);
151 apr_hash_set(trans->session_cache,
152 apr_pstrdup(trans->session_pool, tmsg->thread),
154 apr_pstrdup(trans->session_pool, tmsg->sender));
160 osrfListFree(msg_list);
161 jsonObjectFree(msg_wrapper);
165 * Responder thread main body.
166 * Collects responses from the opensrf network and relays them to the
169 void* APR_THREAD_FUNC osrf_responder_thread_main(apr_thread_t *thread, void *data) {
171 transport_message *tmsg;
174 if (apr_thread_mutex_unlock(trans->mutex) != APR_SUCCESS) {
175 osrfLogError(OSRF_LOG_MARK, "WS error un-locking thread mutex");
179 // wait for a response
180 tmsg = client_recv(osrf_handle, -1);
182 if (!tmsg) continue; // early exit on interrupt
184 if (apr_thread_mutex_lock(trans->mutex) != APR_SUCCESS) {
185 osrfLogError(OSRF_LOG_MARK, "WS error locking thread mutex");
189 osrf_responder_thread_main_body(tmsg);
199 * Allocate the session cache and create the responder thread
201 int child_init(const WebSocketServer *server) {
203 apr_pool_t *pool = NULL;
204 apr_thread_t *thread = NULL;
205 apr_threadattr_t *thread_attr = NULL;
206 apr_thread_mutex_t *mutex = NULL;
207 request_rec *r = server->request(server);
209 osrfLogDebug(OSRF_LOG_MARK, "WS child_init");
211 // osrf_handle will already be connected if this is not the first request
212 // served by this process.
213 if ( !(osrf_handle = osrfSystemGetTransportClient()) ) {
214 char* config_file = "/openils/conf/opensrf_core.xml";
215 char* config_ctx = "gateway"; //TODO config
216 if (!osrfSystemBootstrapClientResc(config_file, config_ctx, "websocket")) {
217 osrfLogError(OSRF_LOG_MARK,
218 "WS unable to bootstrap OpenSRF client with config %s", config_file);
222 osrf_handle = osrfSystemGetTransportClient();
225 // create a standalone pool for our translator data
226 if (apr_pool_create(&pool, NULL) != APR_SUCCESS) {
227 osrfLogError(OSRF_LOG_MARK, "WS Unable to create apr_pool");
232 // allocate our static translator instance
233 trans = (osrfWebsocketTranslator*)
234 apr_palloc(pool, sizeof(osrfWebsocketTranslator));
237 osrfLogError(OSRF_LOG_MARK, "WS Unable to create translator");
241 trans->main_pool = pool;
242 trans->server = server;
243 trans->osrf_router = osrfConfigGetValue(NULL, "/router_name");
244 trans->osrf_domain = osrfConfigGetValue(NULL, "/domain");
246 // Create the responder thread. Once created,
247 // it runs for the lifetime of this process.
248 if ( (apr_threadattr_create(&thread_attr, trans->main_pool) == APR_SUCCESS) &&
249 (apr_threadattr_detach_set(thread_attr, 0) == APR_SUCCESS) &&
250 (apr_thread_create(&thread, thread_attr,
251 osrf_responder_thread_main, trans, trans->main_pool) == APR_SUCCESS)) {
253 trans->responder_thread = thread;
256 osrfLogError(OSRF_LOG_MARK, "WS unable to create responder thread");
260 if (apr_thread_mutex_create(
261 &mutex, APR_THREAD_MUTEX_UNNESTED,
262 trans->main_pool) != APR_SUCCESS) {
263 osrfLogError(OSRF_LOG_MARK, "WS unable to create thread mutex");
267 trans->mutex = mutex;
273 * Create the per-client translator
275 void* CALLBACK on_connect_handler(const WebSocketServer *server) {
276 request_rec *r = server->request(server);
279 osrfLogDebug(OSRF_LOG_MARK,
280 "WS connect from %s", r->connection->remote_ip);
281 //"WS connect from %s", r->connection->client_ip); // apache 2.4
284 if (child_init(server) != APR_SUCCESS) {
289 // create a standalone pool for the session cache values, which will be
290 // destroyed on client disconnect.
291 //if (apr_pool_create(&pool, trans->main_pool) != APR_SUCCESS) {
292 if (apr_pool_create(&pool, r->pool) != APR_SUCCESS) {
293 osrfLogError(OSRF_LOG_MARK, "WS Unable to create apr_pool");
297 trans->session_pool = pool;
298 trans->session_cache = apr_hash_make(trans->session_pool);
300 if (trans->session_cache == NULL) {
301 osrfLogError(OSRF_LOG_MARK, "WS unable to create session cache");
305 trans->client_connected = 1;
311 * for each inbound opensrf message:
312 * 1. Stamp the ingress
313 * 2. REQUEST: log it as activity
314 * 3. DISCONNECT: remove the cached recipient
315 * then re-string-ify for xmpp delivery
318 static char* extract_inbound_messages(
319 const request_rec *r,
322 const char* recipient,
323 const jsonObject *osrf_msg) {
326 int num_msgs = osrf_msg->size;
328 osrfMessage* msg_list[num_msgs];
330 // here we do an extra json round-trip to get the data
331 // in a form osrf_message_deserialize can understand
332 char *osrf_msg_json = jsonObjectToJSON(osrf_msg);
333 osrf_message_deserialize(osrf_msg_json, msg_list, num_msgs);
336 // should we require the caller to always pass the service?
337 if (service == NULL) service = "";
339 for(i = 0; i < num_msgs; i++) {
341 osrfMessageSetIngress(msg, WEBSOCKET_TRANSLATOR_INGRESS);
343 switch(msg->m_type) {
346 const jsonObject* params = msg->_params;
347 growing_buffer* act = buffer_init(128);
348 char* method = msg->method_name;
349 buffer_fadd(act, "[%s] [%s] %s %s",
350 r->connection->remote_ip, "", service, method);
352 const jsonObject* obj = NULL;
355 int redactParams = 0;
356 while( (str = osrfStringArrayGetString(log_protect_arr, i++)) ) {
357 if(!strncmp(method, str, strlen(str))) {
363 OSRF_BUFFER_ADD(act, " **PARAMS REDACTED**");
366 while((obj = jsonObjectGetIndex(params, i++))) {
367 char* str = jsonObjectToJSON(obj);
369 OSRF_BUFFER_ADD(act, " ");
371 OSRF_BUFFER_ADD(act, ", ");
372 OSRF_BUFFER_ADD(act, str);
376 osrfLogActivity(OSRF_LOG_MARK, "%s", act->buf);
383 if (apr_hash_get(trans->session_cache, thread, APR_HASH_KEY_STRING)) {
385 // this clears the hash value, but the key/value memory
386 // will not be cleared until their pool is cleared.
387 apr_hash_set(trans->session_cache,
388 apr_pstrdup(trans->session_pool, thread),
390 apr_pstrdup(trans->session_pool, recipient));
396 return osrfMessageSerializeBatch(msg_list, num_msgs);
400 * Parse opensrf request and relay the request to the opensrf network.
402 static size_t on_message_handler_body(void *data,
403 const WebSocketServer *server, const int type,
404 unsigned char *buffer, const size_t buffer_size) {
406 request_rec *r = server->request(server);
408 jsonObject *msg_wrapper = NULL; // free me
409 const jsonObject *tmp_obj = NULL;
410 const jsonObject *osrf_msg = NULL;
411 const char *service = NULL;
412 const char *thread = NULL;
413 const char *log_xid = NULL;
414 char *msg_body = NULL;
415 char *recipient = NULL;
418 if (buffer_size <= 0) return OK;
420 osrfLogDebug(OSRF_LOG_MARK, "WS received message size=%d", buffer_size);
422 // buffer may not be \0-terminated, which jsonParse requires
423 char buf[buffer_size + 1];
424 memcpy(buf, buffer, buffer_size);
425 buf[buffer_size] = '\0';
427 msg_wrapper = jsonParse(buf);
429 if (msg_wrapper == NULL) {
430 osrfLogWarning(OSRF_LOG_MARK, "WS Invalid JSON: %s", buf);
431 return HTTP_BAD_REQUEST;
434 osrf_msg = jsonObjectGetKeyConst(msg_wrapper, "osrf_msg");
436 if (tmp_obj = jsonObjectGetKeyConst(msg_wrapper, "service"))
437 service = jsonObjectGetString(tmp_obj);
439 if (tmp_obj = jsonObjectGetKeyConst(msg_wrapper, "thread"))
440 thread = jsonObjectGetString(tmp_obj);
442 if (tmp_obj = jsonObjectGetKeyConst(msg_wrapper, "log_xid"))
443 log_xid = jsonObjectGetString(tmp_obj);
447 // use the caller-provide log trace id
448 if (strlen(log_xid) > MAX_THREAD_SIZE) {
449 osrfLogWarning(OSRF_LOG_MARK, "WS log_xid exceeds max length");
450 return HTTP_BAD_REQUEST;
453 // TODO: make this work with non-client and make this call accept
454 // const char*'s. casting to (char*) for now to silence warnings.
455 osrfLogSetXid((char*) log_xid);
458 // generate a new log trace id for this relay
464 if (strlen(thread) > MAX_THREAD_SIZE) {
465 osrfLogWarning(OSRF_LOG_MARK, "WS thread exceeds max length");
466 return HTTP_BAD_REQUEST;
469 // since clients can provide their own threads at session start time,
470 // the presence of a thread does not guarantee a cached recipient
471 recipient = (char*) apr_hash_get(
472 trans->session_cache, thread, APR_HASH_KEY_STRING);
475 osrfLogDebug(OSRF_LOG_MARK, "WS found cached recipient %s", recipient);
482 int size = snprintf(recipient_buf, RECIP_BUF_SIZE - 1,
483 "%s@%s/%s", trans->osrf_router, trans->osrf_domain, service);
484 recipient_buf[size] = '\0';
485 recipient = recipient_buf;
488 osrfLogWarning(OSRF_LOG_MARK, "WS Unable to determine recipient");
489 return HTTP_BAD_REQUEST;
493 osrfLogDebug(OSRF_LOG_MARK,
494 "WS relaying message thread=%s, xid=%s, recipient=%s",
495 thread, osrfLogGetXid(), recipient);
497 msg_body = extract_inbound_messages(
498 r, service, thread, recipient, osrf_msg);
500 transport_message *tmsg = message_init(
501 msg_body, NULL, thread, recipient, NULL);
503 message_set_osrf_xid(tmsg, osrfLogGetXid());
504 client_send_message(osrf_handle, tmsg);
509 jsonObjectFree(msg_wrapper);
515 static size_t CALLBACK on_message_handler(void *data,
516 const WebSocketServer *server, const int type,
517 unsigned char *buffer, const size_t buffer_size) {
519 if (apr_thread_mutex_lock(trans->mutex) != APR_SUCCESS) {
520 osrfLogError(OSRF_LOG_MARK, "WS error locking thread mutex");
521 return 1; // TODO: map to apr_status_t value?
524 apr_status_t stat = on_message_handler_body(data, server, type, buffer, buffer_size);
526 if (apr_thread_mutex_unlock(trans->mutex) != APR_SUCCESS) {
527 osrfLogError(OSRF_LOG_MARK, "WS error locking thread mutex");
536 * Release all memory allocated from the translator pool and kill the pool.
538 void CALLBACK on_disconnect_handler(
539 void *data, const WebSocketServer *server) {
541 osrfWebsocketTranslator *trans = (osrfWebsocketTranslator*) data;
542 trans->client_connected = 0;
544 apr_hash_clear(trans->session_cache);
547 It's not necessary to destroy our session_pool, since
548 it's a child of the apache request_rec pool, which is
549 destroyed after client disconnect.
550 apr_pool_destroy(trans->session_pool);
553 trans->session_pool = NULL;
554 trans->session_cache = NULL;
556 request_rec *r = server->request(server);
557 osrfLogDebug(OSRF_LOG_MARK,
558 "WS disconnect from %s", r->connection->remote_ip);
559 //"WS disconnect from %s", r->connection->client_ip); // apache 2.4
563 * Be nice and clean up our mess
565 void CALLBACK on_destroy_handler(WebSocketPlugin *plugin) {
567 apr_thread_exit(trans->responder_thread, APR_SUCCESS);
568 apr_thread_mutex_destroy(trans->mutex);
569 apr_pool_destroy(trans->main_pool);
575 static WebSocketPlugin osrf_websocket_plugin = {
576 sizeof(WebSocketPlugin),
577 WEBSOCKET_PLUGIN_VERSION_0,
581 on_disconnect_handler
584 extern EXPORT WebSocketPlugin * CALLBACK osrf_websocket_init() {
585 return &osrf_websocket_plugin;