2 Copyright 2002 Kevin O'Donnell
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * Include the core server components.
23 #include "http_config.h"
28 #include "opensrf/transport_client.h"
29 #include "opensrf/generic_utils.h"
30 #include "opensrf/osrf_message.h"
31 #include "opensrf/osrf_app_session.h"
35 * This function is registered as a handler for HTTP methods and will
36 * therefore be invoked for all GET requests (and others). Regardless
37 * of the request type, this function simply sends a message to
38 * STDERR (which httpd redirects to logs/error_log). A real module
39 * would do *alot* more at this point.
41 #define MODULE_NAME "ils_gateway_module"
44 static void mod_ils_gateway_child_init(apr_pool_t *p, server_rec *s) {
45 if( ! osrf_system_bootstrap_client(
46 "/pines/cvs/ILS/OpenSRF/src/gateway/gateway.xml") ) { /* config option */
48 fprintf(stderr, "Bootstrapping %d\n", getpid() );
52 static int mod_ils_gateway_method_handler (request_rec *r) {
55 /* make sure we're needed first thing*/
56 if (strcmp(r->handler, MODULE_NAME ))
60 apr_pool_t *p = r->pool; /* memory pool */
61 char* arg = r->args; /* url query string */
63 char* service = NULL; /* service to connect to */
64 char* method = NULL; /* method to perform */
66 json* params = NULL; /* method parameters */
67 json* exception = NULL; /* returned in error conditions */
69 growing_buffer* buffer = NULL; /* POST data */
70 growing_buffer* tmp_buf = NULL; /* temp buffer */
72 char* key = NULL; /* query item name */
73 char* val = NULL; /* query item value */
77 /* verify we are connected */
78 if(!osrf_system_get_transport_client()) {
79 fprintf(stderr,"Bootstrap Failed, no transport client");
81 return HTTP_INTERNAL_SERVER_ERROR;
84 /* set content type to text/plain for passing around JSON objects */
85 ap_set_content_type(r, "text/plain");
89 /* gather the post args and append them to the url query string */
90 if( !strcmp(r->method,"POST") ) {
92 ap_setup_client_block(r,REQUEST_CHUNKED_DECHUNK);
94 if(! ap_should_client_block(r)) {
95 fprintf(stderr, "No Post Body\n");
101 buffer = buffer_init(1024);
103 while(ap_get_client_block(r, body, 1024)) {
104 buffer_add( buffer, body );
109 tmp_buf = buffer_init(1024);
110 buffer_add(tmp_buf,arg);
111 buffer_add(tmp_buf,buffer->buf);
112 arg = (char*) apr_pstrdup(p, tmp_buf->buf);
113 buffer_free(tmp_buf);
115 arg = (char*) apr_pstrdup(p, buffer->buf);
122 if( ! arg || !arg[0] ) { /* we received no request */
123 fprintf(stderr,"No Args\n");
128 r->allowed |= (AP_METHOD_BIT << M_GET);
129 r->allowed |= (AP_METHOD_BIT << M_POST);
132 char* argcopy = (char*) apr_pstrdup(p, arg);
135 params = json_object_new_array();;
136 while( argcopy && (val = ap_getword(p, &argcopy, '&'))) {
138 key = ap_getword(r->pool,&val, '=');
142 ap_unescape_url((char*)key);
143 ap_unescape_url((char*)val);
145 if(!strcmp(key,"service"))
148 if(!strcmp(key,"method"))
151 if(!strcmp(key,"__param"))
152 json_object_array_add( params, json_tokener_parse(val));
155 fprintf(stderr, "Performing(%d): service %s | method %s | \nparams %s\n\n",
156 getpid(), service, method, json_object_to_json_string(params));
159 osrf_app_session* session = osrf_app_client_session_init(service);
161 /* connect to the remote service */
162 if(!osrf_app_session_connect(session)) {
163 exception = json_object_new_object();
164 json_object_object_add( exception, "is_err", json_object_new_int(1));
165 json_object_object_add( exception,
166 "err_msg", json_object_new_string("Unable to connect to remote service"));
168 ap_rputs(json_object_to_json_string(exception), r );
169 json_object_put(exception);
173 int req_id = osrf_app_session_make_request( session, params, method, 1 );
174 json_object_put(params);
176 osrf_message* omsg = NULL;
178 growing_buffer* result_data = buffer_init(256);
179 buffer_add(result_data, "[");
181 /* gather result data */
182 while((omsg = osrf_app_session_request_recv( session, req_id, 20 ))) {
184 if( omsg->result_string ) {
185 buffer_add(result_data, omsg->result_string);
186 buffer_add( result_data, ",");
190 fprintf(stderr,"*** Looks like we got an exception\n" );
193 /* build the exception information */
194 growing_buffer* exc_buffer = buffer_init(256);
195 buffer_add( exc_buffer, "\nReceived Exception:\nName: " );
196 buffer_add( exc_buffer, omsg->status_name );
197 buffer_add( exc_buffer, "\nStatus: " );
198 buffer_add( exc_buffer, omsg->status_text );
199 buffer_add( exc_buffer, "\nStatus: " );
202 sprintf( code, "%d", omsg->status_code );
203 buffer_add( exc_buffer, code );
205 /* build the exception object */
206 exception = json_object_new_object();
207 json_object_object_add( exception, "is_err", json_object_new_int(1));
208 json_object_object_add( exception,
209 "err_msg", json_object_new_string(exc_buffer->buf));
210 buffer_free(exc_buffer);
211 osrf_message_free(omsg);
215 osrf_message_free(omsg);
219 /* remove trailing comma */
220 if( result_data->buf[strlen(result_data->buf)-1] == ',') {
221 result_data->buf[strlen(result_data->buf)-1] = '\0';
222 result_data->n_used--;
225 buffer_add(result_data,"]");
227 char* content = NULL;
229 /* round up our data */
231 content = strdup(json_object_to_json_string(exception));
232 json_object_put(exception);
234 content = buffer_data(result_data);
237 buffer_free(result_data);
244 osrf_app_session_request_finish( session, req_id );
245 osrf_app_session_disconnect( session );
246 osrf_app_session_destroy(session); //need to test removing this
253 * This function is a callback and it declares what other functions
254 * should be called for request processing and configuration requests.
255 * This callback function declares the Handlers for other events. */
256 static void mod_ils_gateway_register_hooks (apr_pool_t *p) {
257 // I think this is the call to make to register a handler for method calls (GET PUT et. al.).
258 // We will ask to be last so that the comment has a higher tendency to
260 ap_hook_handler(mod_ils_gateway_method_handler, NULL, NULL, APR_HOOK_MIDDLE);
261 ap_hook_child_init(mod_ils_gateway_child_init,NULL,NULL,APR_HOOK_MIDDLE);
265 * Declare and populate the module's data structure. The
266 * name of this structure ('tut1_module') is important - it
267 * must match the name of the module. This structure is the
268 * only "glue" between the httpd core and the module.
271 module AP_MODULE_DECLARE_DATA ils_gateway_module =
273 STANDARD20_MODULE_STUFF,
279 mod_ils_gateway_register_hooks,