Open-ILS/src/apachemods/mod_rest_gateway.c

   1 #include "mod_rest_gateway.h"
   2
   3 char* ils_rest_gateway_config_file;
   4
   5 static const char* ils_gateway_set_config(cmd_parms *parms, void *config, const char *arg) {
   6         ils_gateway_config  *cfg;
   7
   8         cfg = ap_get_module_config(parms->server->module_config, &ils_rest_gateway_module);
   9
  10         cfg->configfile = (char*) arg;
  11         ils_rest_gateway_config_file = (char*) arg;
  12
  13         return NULL;
  14 }
  15
  16 /* tell apache about our commands */
  17 static const command_rec ils_gateway_cmds[] = {
  18         AP_INIT_TAKE1( GATEWAY_CONFIG, ils_gateway_set_config, NULL, RSRC_CONF, "gateway config file"),
  19         {NULL}
  20 };
  21
  22 /* build the config object */
  23 static void* ils_gateway_create_config( apr_pool_t* p, server_rec* s) {
  24         ils_gateway_config* cfg = (ils_gateway_config*) apr_palloc(p, sizeof(ils_gateway_config));
  25         cfg->configfile = GATEWAY_DEFAULT_CONFIG;
  26         return (void*) cfg;
  27 }
  28
  29
  30 static void mod_ils_gateway_child_init(apr_pool_t *p, server_rec *s) {
  31
  32         char* cfg = ils_rest_gateway_config_file;
  33
  34         if( ! osrf_system_bootstrap_client( cfg, CONFIG_CONTEXT) ) {
  35                 osrfLogError("Unable to load gateway config file...");
  36                 return;
  37         }
  38         fprintf(stderr, "Bootstrapping %d\n", getpid() );
  39         fflush(stderr);
  40 }
  41
  42 static int mod_ils_gateway_method_handler (request_rec *r) {
  43
  44         /* make sure we're needed first thing*/
  45         if (strcmp(r->handler, MODULE_NAME ))
  46                 return DECLINED;
  47
  48         apr_pool_t *p = r->pool;        /* memory pool */
  49         char* arg = r->args;                    /* url query string */
  50
  51         char* service                                   = NULL; /* service to connect to */
  52         char* method                                    = NULL; /* method to perform */
  53
  54         //json* exception                               = NULL; /* returned in error conditions */
  55         jsonObject* exception                           = NULL; /* returned in error conditions */
  56         string_array* sarray                    = init_string_array(12); /* method parameters */
  57
  58         growing_buffer* buffer          = NULL; /* POST data */
  59         growing_buffer* tmp_buf         = NULL; /* temp buffer */
  60
  61         char* key                                               = NULL; /* query item name */
  62         char* val                                               = NULL; /* query item value */
  63
  64
  65
  66         /* verify we are connected */
  67         if(!osrf_system_get_transport_client()) {
  68                 osrfLogError("Bootstrap Failed, no transport client");
  69                 return HTTP_INTERNAL_SERVER_ERROR;
  70         }
  71
  72
  73
  74         /* gather the post args and append them to the url query string */
  75         if( !strcmp(r->method,"POST") ) {
  76
  77                 ap_setup_client_block(r,REQUEST_CHUNKED_DECHUNK);
  78
  79                 if(! ap_should_client_block(r)) {
  80                         osrfLogWarning("No Post Body");
  81                 }
  82
  83                 char body[1025];
  84                 memset(body,0,1025);
  85                 buffer = buffer_init(1025);
  86
  87                 while(ap_get_client_block(r, body, 1024)) {
  88                         osrfLogDebug("Apache read POST block data: %s\n", body);
  89                         buffer_add( buffer, body );
  90                         memset(body,0,1025);
  91                 }
  92
  93                 if(arg && arg[0]) {
  94                         tmp_buf = buffer_init(1024);
  95                         buffer_add(tmp_buf,arg);
  96                         buffer_add(tmp_buf,buffer->buf);
  97                         arg = (char*) apr_pstrdup(p, tmp_buf->buf);
  98                         buffer_free(tmp_buf);
  99                 } else {
 100                         arg = (char*) apr_pstrdup(p, buffer->buf);
 101                 }
 102                 buffer_free(buffer);
 103
 104         }
 105
 106         osrfLogDebug("params args are %s", arg);
 107
 108
 109         if( ! arg || !arg[0] ) { /* we received no request */
 110                 osrfLogWarning("No Args");
 111                 return OK;
 112         }
 113
 114         r->allowed |= (AP_METHOD_BIT << M_GET);
 115         r->allowed |= (AP_METHOD_BIT << M_POST);
 116
 117
 118         while( arg && (val = ap_getword(p, (const char**) &arg, '&'))) {
 119
 120                 key = ap_getword(r->pool, (const char**) &val, '=');
 121                 if(!key || !key[0])
 122                         break;
 123
 124                 ap_unescape_url((char*)key);
 125                 ap_unescape_url((char*)val);
 126
 127                 if(!strcmp(key,"service"))
 128                         service = val;
 129
 130                 if(!strcmp(key,"method"))
 131                         method = val;
 132
 133                 if(!strcmp(key,"param"))
 134                         string_array_add(sarray, val);
 135
 136         }
 137
 138         osrfLogInfo("Performing(%d):  service %s | method %s | \n",
 139                         getpid(), service, method );
 140
 141         int k;
 142         for( k = 0; k!= sarray->size; k++ ) {
 143                 osrfLogInfo( "param %s", string_array_get_string(sarray,k));
 144         }
 145
 146         osrf_app_session* session = osrf_app_client_session_init(service);
 147
 148         osrfLogDebug("MOD session service: %s", session->remote_service );
 149
 150         int req_id = osrf_app_session_make_req( session, NULL, method, 1, sarray );
 151         string_array_destroy(sarray);
 152
 153         osrf_message* omsg = NULL;
 154
 155         growing_buffer* result_data = buffer_init(256);
 156         buffer_add(result_data, "[");
 157
 158         /* gather result data */
 159         while((omsg = osrf_app_session_request_recv( session, req_id, 60 ))) {
 160
 161                 if( omsg->_result_content ) {
 162                         char* content = jsonObjectToJSON(omsg->_result_content);
 163                         buffer_add(result_data, content);
 164                         buffer_add( result_data, ",");
 165                         free(content);
 166
 167                 } else {
 168
 169
 170                         /* build the exception information */
 171                         growing_buffer* exc_buffer = buffer_init(256);
 172                         buffer_add( exc_buffer, "\nReceived Exception:\nName: " );
 173                         buffer_add( exc_buffer, omsg->status_name );
 174                         buffer_add( exc_buffer, "\nStatus: " );
 175                         buffer_add( exc_buffer, omsg->status_text );
 176                         buffer_add( exc_buffer, "\nStatus: " );
 177
 178                         char code[16];
 179                         memset(code, 0, 16);
 180                         sprintf( code, "%d", omsg->status_code );
 181                         buffer_add( exc_buffer, code );
 182
 183                         exception = json_parse_string("{}");
 184                         jsonObjectSetKey(exception, "is_err", json_parse_string("1"));
 185                         jsonObjectSetKey(exception, "err_msg", jsonNewObject(exc_buffer->buf) );
 186
 187                         osrfLogWarning("*** Looks like we got a "
 188                                         "server exception\n%s", exc_buffer->buf );
 189
 190                         buffer_free(exc_buffer);
 191                         osrf_message_free(omsg);
 192                         break;
 193                 }
 194
 195                 osrf_message_free(omsg);
 196                 omsg = NULL;
 197         }
 198
 199         /* remove trailing comma */
 200         if( result_data->buf[strlen(result_data->buf)-1] == ',') {
 201                 result_data->buf[strlen(result_data->buf)-1] = '\0';
 202                 result_data->n_used--;
 203         }
 204
 205         buffer_add(result_data,"]");
 206
 207         char* content = NULL;
 208
 209         if(exception) {
 210                 content = jsonObjectToJSON(exception);
 211                 jsonObjectFree(exception);
 212         }
 213
 214         /* set content type to text/xml for passing around XML objects */
 215         ap_set_content_type(r, "text/xml");
 216         if(content) { /* exception... */
 217                 char* tmp = content;
 218                 content = json_string_to_xml( tmp );
 219                 free(tmp);
 220         } else {
 221                 content = json_string_to_xml( result_data->buf );
 222         }
 223
 224         buffer_free(result_data);
 225
 226         if(content) {
 227                 osrfLogDebug( "APACHE writing data to web client: %s", content );
 228                 ap_rputs(content,r);
 229                 free(content);
 230         }
 231
 232         osrf_app_session_request_finish( session, req_id );
 233         osrfLogDebug("gateway process message successfully");
 234
 235
 236         osrf_app_session_destroy(session);
 237         return OK;
 238
 239 }
 240
 241 static void mod_ils_gateway_register_hooks (apr_pool_t *p) {
 242         ap_hook_handler(mod_ils_gateway_method_handler, NULL, NULL, APR_HOOK_MIDDLE);
 243         ap_hook_child_init(mod_ils_gateway_child_init,NULL,NULL,APR_HOOK_MIDDLE);
 244 }
 245
 246
 247 module AP_MODULE_DECLARE_DATA ils_rest_gateway_module = {
 248         STANDARD20_MODULE_STUFF,
 249         NULL,
 250         NULL,
 251         ils_gateway_create_config,
 252         NULL,
 253         ils_gateway_cmds,
 254         mod_ils_gateway_register_hooks,
 255 };
 256