OpenSRF/src/gateway/mod_ils_gateway.c

   1 #include "httpd.h"
   2 #include "http_config.h"
   3 #include "http_core.h"
   4 #include "http_protocol.h"
   5 #include "apr_compat.h"
   6 #include "apr_strings.h"
   7
   8 /* our stuff */
   9 #include "opensrf/transport_client.h"
  10 #include "opensrf/osrf_message.h"
  11 #include "opensrf/osrf_app_session.h"
  12 #include "string_array.h"
  13 #include "md5.h"
  14 #include "objson/object.h"
  15 #include "objson/json_parser.h"
  16
  17 #ifdef RESTGATEWAY
  18 #include "rest_xml.h"
  19
  20 #define MODULE_NAME "ils_rest_gateway_module"
  21 #else
  22 #define MODULE_NAME "ils_gateway_module"
  23 #endif
  24
  25
  26 static void mod_ils_gateway_child_init(apr_pool_t *p, server_rec *s) {
  27         char* context = "gateway";
  28         #ifdef RESTGATEWAY
  29         context = "rest_gateway";
  30         #endif
  31         if( ! osrf_system_bootstrap_client( "/home/erickson/sandbox/openils/conf/opensrf_core.xml", context) )
  32                 fatal_handler("Unable to load gateway config file...");
  33         fprintf(stderr, "Bootstrapping %d\n", getpid() );
  34         fflush(stderr);
  35 }
  36
  37 static int mod_ils_gateway_method_handler (request_rec *r) {
  38
  39
  40         /* make sure we're needed first thing*/
  41         if (strcmp(r->handler, MODULE_NAME ))
  42                 return DECLINED;
  43
  44
  45         apr_pool_t *p = r->pool;        /* memory pool */
  46         char* arg = r->args;                    /* url query string */
  47
  48         char* service                                   = NULL; /* service to connect to */
  49         char* method                                    = NULL; /* method to perform */
  50
  51         //json* exception                               = NULL; /* returned in error conditions */
  52         object* exception                               = NULL; /* returned in error conditions */
  53         string_array* sarray                    = init_string_array(12); /* method parameters */
  54
  55         growing_buffer* buffer          = NULL; /* POST data */
  56         growing_buffer* tmp_buf         = NULL; /* temp buffer */
  57
  58         char* key                                               = NULL; /* query item name */
  59         char* val                                               = NULL; /* query item value */
  60
  61
  62
  63         /* verify we are connected */
  64         if(!osrf_system_get_transport_client()) {
  65                 fatal_handler("Bootstrap Failed, no transport client");
  66                 return HTTP_INTERNAL_SERVER_ERROR;
  67         }
  68
  69
  70
  71         /* gather the post args and append them to the url query string */
  72         if( !strcmp(r->method,"POST") ) {
  73
  74                 ap_setup_client_block(r,REQUEST_CHUNKED_DECHUNK);
  75
  76                 if(! ap_should_client_block(r)) {
  77                         warning_handler("No Post Body");
  78                 }
  79
  80                 char body[1025];
  81                 memset(body,0,1025);
  82                 buffer = buffer_init(1025);
  83
  84                 while(ap_get_client_block(r, body, 1024)) {
  85                         debug_handler("Apache read POST block data: %s\n", body);
  86                         buffer_add( buffer, body );
  87                         memset(body,0,1025);
  88                 }
  89
  90                 if(arg && arg[0]) {
  91                         tmp_buf = buffer_init(1024);
  92                         buffer_add(tmp_buf,arg);
  93                         buffer_add(tmp_buf,buffer->buf);
  94                         arg = (char*) apr_pstrdup(p, tmp_buf->buf);
  95                         buffer_free(tmp_buf);
  96                 } else {
  97                         arg = (char*) apr_pstrdup(p, buffer->buf);
  98                 }
  99                 buffer_free(buffer);
 100
 101         }
 102
 103         debug_handler("params args are %s", arg);
 104
 105
 106         if( ! arg || !arg[0] ) { /* we received no request */
 107                 warning_handler("No Args");
 108                 return OK;
 109         }
 110
 111         r->allowed |= (AP_METHOD_BIT << M_GET);
 112         r->allowed |= (AP_METHOD_BIT << M_POST);
 113
 114
 115         while( arg && (val = ap_getword(p, (const char**) &arg, '&'))) {
 116
 117                 key = ap_getword(r->pool, (const char**) &val, '=');
 118                 if(!key || !key[0])
 119                         break;
 120
 121                 ap_unescape_url((char*)key);
 122                 ap_unescape_url((char*)val);
 123
 124                 if(!strcmp(key,"service"))
 125                         service = val;
 126
 127                 if(!strcmp(key,"method"))
 128                         method = val;
 129
 130                 if(!strcmp(key,"param"))
 131                         string_array_add(sarray, val);
 132
 133         }
 134
 135         info_handler("Performing(%d):  service %s | method %s | \n",
 136                         getpid(), service, method );
 137
 138         int k;
 139         for( k = 0; k!= sarray->size; k++ ) {
 140                 info_handler( "param %s", string_array_get_string(sarray,k));
 141         }
 142
 143         osrf_app_session* session = osrf_app_client_session_init(service);
 144
 145         debug_handler("MOD session service: %s", session->remote_service );
 146
 147         int req_id = osrf_app_session_make_req( session, NULL, method, 1, sarray );
 148         string_array_destroy(sarray);
 149
 150         osrf_message* omsg = NULL;
 151
 152         growing_buffer* result_data = buffer_init(256);
 153         buffer_add(result_data, "[");
 154
 155         /* gather result data */
 156         while((omsg = osrf_app_session_request_recv( session, req_id, 60 ))) {
 157
 158                 if( omsg->_result_content ) {
 159                         char* content = object_to_json(omsg->_result_content);
 160                         buffer_add(result_data, content);
 161                         buffer_add( result_data, ",");
 162                         free(content);
 163
 164                 } else {
 165
 166
 167                         /* build the exception information */
 168                         growing_buffer* exc_buffer = buffer_init(256);
 169                         buffer_add( exc_buffer, "\nReceived Exception:\nName: " );
 170                         buffer_add( exc_buffer, omsg->status_name );
 171                         buffer_add( exc_buffer, "\nStatus: " );
 172                         buffer_add( exc_buffer, omsg->status_text );
 173                         buffer_add( exc_buffer, "\nStatus: " );
 174
 175                         char code[16];
 176                         memset(code, 0, 16);
 177                         sprintf( code, "%d", omsg->status_code );
 178                         buffer_add( exc_buffer, code );
 179
 180                         exception = json_parse_string("{}");
 181                         exception->add_key(exception, "is_err", json_parse_string("1"));
 182                         exception->add_key(exception, "err_msg", new_object(exc_buffer->buf) );
 183
 184                         warning_handler("*** Looks like we got a "
 185                                         "server exception\n%s", exc_buffer->buf );
 186
 187                         buffer_free(exc_buffer);
 188                         osrf_message_free(omsg);
 189                         break;
 190                 }
 191
 192                 osrf_message_free(omsg);
 193                 omsg = NULL;
 194         }
 195
 196         /* remove trailing comma */
 197         if( result_data->buf[strlen(result_data->buf)-1] == ',') {
 198                 result_data->buf[strlen(result_data->buf)-1] = '\0';
 199                 result_data->n_used--;
 200         }
 201
 202         buffer_add(result_data,"]");
 203
 204         char* content = NULL;
 205
 206         if(exception) {
 207                 content = exception->to_json(exception);
 208                 free_object(exception);
 209         }
 210
 211 #ifdef RESTGATEWAY
 212         /* set content type to text/xml for passing around XML objects */
 213         ap_set_content_type(r, "text/xml");
 214         if(content) { /* exception... */
 215                 char* tmp = content;
 216                 content = json_string_to_xml( tmp );
 217                 free(tmp);
 218         } else {
 219                 content = json_string_to_xml( result_data->buf );
 220         }
 221
 222 #else
 223         /* set content type to text/plain for passing around JSON objects */
 224         if(!content) {
 225                 ap_set_content_type(r, "text/plain");
 226                 content = buffer_data(result_data);
 227         }
 228 #endif
 229
 230
 231         buffer_free(result_data);
 232
 233         if(content) {
 234                 debug_handler( "APACHE writing data to web client: %s", content );
 235                 ap_rputs(content,r);
 236                 free(content);
 237         }
 238
 239         osrf_app_session_request_finish( session, req_id );
 240         debug_handler("gateway process message successfully");
 241
 242
 243         osrf_app_session_destroy(session);
 244         return OK;
 245
 246 }
 247
 248 /*
 249  * This function is a callback and it declares what other functions
 250   * should be called for request processing and configuration requests.
 251    * This callback function declares the Handlers for other events.  */
 252 static void mod_ils_gateway_register_hooks (apr_pool_t *p) {
 253 // I think this is the call to make to register a handler for method calls (GET PUT et. al.).
 254 // We will ask to be last so that the comment has a higher tendency to
 255 // go at the end.
 256         ap_hook_handler(mod_ils_gateway_method_handler, NULL, NULL, APR_HOOK_MIDDLE);
 257         ap_hook_child_init(mod_ils_gateway_child_init,NULL,NULL,APR_HOOK_MIDDLE);
 258 }
 259
 260 /*
 261  * Declare and populate the module's data structure.  The
 262   * name of this structure ('tut1_module') is important - it
 263    * must match the name of the module.  This structure is the
 264  * only "glue" between the httpd core and the module.
 265   */
 266
 267 #ifdef RESTGATEWAY
 268
 269 module AP_MODULE_DECLARE_DATA ils_rest_gateway_module =
 270 {
 271 STANDARD20_MODULE_STUFF,
 272 NULL,
 273 NULL,
 274 NULL,
 275 NULL,
 276 NULL,
 277 mod_ils_gateway_register_hooks,
 278 };
 279
 280 #else
 281
 282 module AP_MODULE_DECLARE_DATA ils_gateway_module =
 283 {
 284 STANDARD20_MODULE_STUFF,
 285 NULL,
 286 NULL,
 287 NULL,
 288 NULL,
 289 NULL,
 290 mod_ils_gateway_register_hooks,
 291 };
 292
 293 #endif
 294