src/gateway/osrf_json_gateway.c

   1 #include "apachetools.h"
   2 #include "opensrf/osrf_app_session.h"
   3 #include "opensrf/osrf_system.h"
   4 #include "opensrf/osrfConfig.h"
   5 #include "objson/object.h"
   6 #include "objson/json2xml.h"
   7 #include <sys/time.h>
   8 #include <sys/resource.h>
   9
  10
  11 #define MODULE_NAME "osrf_json_gateway_module"
  12 #define GATEWAY_CONFIG "OSRFGatewayConfig"
  13 #define CONFIG_CONTEXT "gateway"
  14
  15 #define GATEWAY_DEFAULT_CONFIG "/openils/conf/opensrf_core.xml"
  16
  17
  18 /* our config structure */
  19 typedef struct {
  20         char* configfile;  /* our bootstrap config file */
  21 } osrf_json_gateway_config;
  22
  23 module AP_MODULE_DECLARE_DATA osrf_json_gateway_module;
  24
  25 char* osrf_json_gateway_config_file = NULL;
  26 int bootstrapped = 0;
  27 int numserved = 0;
  28 osrfStringArray* allowedServices = NULL;
  29
  30 static const char* osrf_json_gateway_set_config(cmd_parms *parms, void *config, const char *arg) {
  31         osrf_json_gateway_config  *cfg;
  32         cfg = ap_get_module_config(parms->server->module_config, &osrf_json_gateway_module);
  33         cfg->configfile = (char*) arg;
  34         osrf_json_gateway_config_file = (char*) arg;
  35         return NULL;
  36 }
  37
  38 /* tell apache about our commands */
  39 static const command_rec osrf_json_gateway_cmds[] = {
  40         AP_INIT_TAKE1( GATEWAY_CONFIG, osrf_json_gateway_set_config,
  41                         NULL, RSRC_CONF, "osrf json gateway config file"),
  42         {NULL}
  43 };
  44
  45 /* build the config object */
  46 static void* osrf_json_gateway_create_config( apr_pool_t* p, server_rec* s) {
  47         osrf_json_gateway_config* cfg = (osrf_json_gateway_config*)
  48                         apr_palloc(p, sizeof(osrf_json_gateway_config));
  49         cfg->configfile = GATEWAY_DEFAULT_CONFIG;
  50         return (void*) cfg;
  51 }
  52
  53
  54 static void osrf_json_gateway_child_init(apr_pool_t *p, server_rec *s) {
  55
  56         char* cfg = osrf_json_gateway_config_file;
  57         char buf[32];
  58         memset(buf, 0x0, 32);
  59         int t = time(NULL);
  60         snprintf(buf, 32, "%d", t);
  61
  62         if( ! osrfSystemBootstrapClientResc( cfg, CONFIG_CONTEXT, buf ) ) {
  63                 ap_log_error( APLOG_MARK, APLOG_ERR, 0, s,
  64                         "Unable to Bootstrap OpenSRF Client with config %s..", cfg);
  65                 return;
  66         }
  67
  68         bootstrapped = 1;
  69         allowedServices = osrfNewStringArray(8);
  70         osrfLogInfo(OSRF_LOG_MARK, "Bootstrapping gateway child for requests");
  71         osrfConfigGetValueList( NULL, allowedServices, "/services/service" );
  72
  73         int i;
  74         for( i = 0; i < allowedServices->size; i++ ) {
  75                 ap_log_error( APLOG_MARK, APLOG_DEBUG, 0, s,
  76                         "allowed service: %s\n", osrfStringArrayGetString(allowedServices, i));
  77         }
  78 }
  79
  80 static int osrf_json_gateway_method_handler (request_rec *r) {
  81
  82         /* make sure we're needed first thing*/
  83         if (strcmp(r->handler, MODULE_NAME )) return DECLINED;
  84
  85         osrfLogDebug(OSRF_LOG_MARK, "osrf gateway: entered request handler");
  86
  87         /* verify we are connected */
  88         if( !bootstrapped || !osrf_system_get_transport_client()) {
  89                 ap_log_rerror( APLOG_MARK, APLOG_ERR, 0, r, "Cannot process request "
  90                                 "because the OpenSRF JSON gateway has not been bootstrapped...");
  91                 return HTTP_INTERNAL_SERVER_ERROR;
  92         }
  93
  94         osrfLogSetAppname("osrf_json_gw");
  95
  96         char* service           = NULL; /* service to connect to */
  97         char* method            = NULL; /* method to perform */
  98         char* format            = NULL; /* method to perform */
  99         char* a_l                       = NULL; /* request api level */
 100         int   isXML                     = 0;
 101         int   api_level = 1;
 102
 103         r->allowed |= (AP_METHOD_BIT << M_GET);
 104         r->allowed |= (AP_METHOD_BIT << M_POST);
 105
 106         osrfLogDebug(OSRF_LOG_MARK, "osrf gateway: parsing URL params");
 107         string_array* mparams   = NULL;
 108         string_array* params            = apacheParseParms(r); /* free me */
 109         service         = apacheGetFirstParamValue( params, "service" );
 110         method          = apacheGetFirstParamValue( params, "method" );
 111         format          = apacheGetFirstParamValue( params, "format" );
 112         a_l                     = apacheGetFirstParamValue( params, "api_level" );
 113         mparams         = apacheGetParamValues( params, "param" ); /* free me */
 114
 115         if (a_l)
 116                 api_level = atoi(a_l);
 117
 118         if (format && !strcasecmp(format, "xml" )) {
 119                 isXML = 1;
 120                 ap_set_content_type(r, "application/xml");
 121         } else {
 122                 ap_set_content_type(r, "text/plain");
 123         }
 124
 125         int ret = OK;
 126
 127         if(!(service && method) ||
 128                 !osrfStringArrayContains(allowedServices, service)) {
 129
 130                 osrfLogError(OSRF_LOG_MARK,
 131                         "Service [%s] not found or not allowed", service);
 132                 ret = HTTP_NOT_FOUND;
 133
 134         } else {
 135
 136                 /* ----------------------------------------------------------------- */
 137                 /* log all requests to the activity log */
 138                 growing_buffer* act = buffer_init(128);
 139                 buffer_fadd(act, "[%s] %s:%s", r->connection->remote_ip, service, method );
 140                 char* str; int i = 0;
 141                 while( (str = osrfStringArrayGetString(mparams, i++)) )
 142                         buffer_fadd(act, " %s", str);
 143
 144                 osrfLogActivity( OSRF_LOG_MARK, act->buf );
 145                 buffer_free(act);
 146                 /* ----------------------------------------------------------------- */
 147
 148                 osrfAppSession* session = osrf_app_client_session_init(service);
 149
 150                 double starttime = get_timestamp_millis();
 151                 int req_id = osrf_app_session_make_req( session, NULL, method, api_level, mparams );
 152                 osrf_message* omsg = NULL;
 153
 154                 int statuscode = 200;
 155
 156                 /* kick off the object */
 157                 if (isXML)
 158                         ap_rputs("<response xmlns=\"http://opensrf.org/-/namespaces/gateway/v1\"><payload>", r);
 159                 else
 160                         ap_rputs("{\"payload\":[", r);
 161
 162                 int morethan1           = 0;
 163                 char* statusname        = NULL;
 164                 char* statustext        = NULL;
 165                 char* output            = NULL;
 166
 167                 while((omsg = osrfAppSessionRequestRecv( session, req_id, 60 ))) {
 168
 169                         statuscode = omsg->status_code;
 170                         jsonObject* res;
 171
 172                         if( ( res = osrfMessageGetResult(omsg)) ) {
 173
 174                                 if (isXML) {
 175                                         output = jsonObjectToXML( res );
 176                                 } else {
 177                                         output = jsonObjectToJSON( res );
 178                                         if( morethan1 ) ap_rputs(",", r); /* comma between JSON array items */
 179                                 }
 180                                 ap_rputs(output, r);
 181                                 free(output);
 182                                 morethan1 = 1;
 183
 184                         } else {
 185
 186                                 if( statuscode > 299 ) { /* the request returned a low level error */
 187                                         statusname = omsg->status_name ? strdup(omsg->status_name) : strdup("Unknown Error");
 188                                         statustext = omsg->status_text ? strdup(omsg->status_text) : strdup("No Error Message");
 189                                         osrfLogError( OSRF_LOG_MARK,  "Gateway received error: %s", statustext );
 190                                 }
 191                         }
 192
 193                         osrf_message_free(omsg);
 194                         if(statusname) break;
 195                 }
 196
 197                 double duration = get_timestamp_millis() - starttime;
 198                 osrfLogDebug(OSRF_LOG_MARK, "gateway request took %lf seconds", duration);
 199
 200
 201                 if (isXML)
 202                         ap_rputs("</payload>", r);
 203                 else
 204                         ap_rputs("]",r); /* finish off the payload array */
 205
 206                 if(statusname) {
 207
 208                         /* add a debug field if the request died */
 209                         ap_log_rerror( APLOG_MARK, APLOG_INFO, 0, r,
 210                                         "OpenSRF JSON Request returned error: %s -> %s", statusname, statustext );
 211                         int l = strlen(statusname) + strlen(statustext) + 32;
 212                         char buf[l];
 213                         bzero(buf,l);
 214
 215                         if (isXML)
 216                                 snprintf( buf, l, "<debug>\"%s : %s\"</debug>", statusname, statustext );
 217
 218                         else {
 219                                 char bb[l];
 220                                 bzero(bb, l);
 221                                 snprintf(bb, l,  "%s : %s", statusname, statustext);
 222                                 jsonObject* tmp = jsonNewObject(bb);
 223                                 char* j = jsonObjectToJSON(tmp);
 224                                 snprintf( buf, l, ",\"debug\": %s", j);
 225                                 free(j);
 226                                 jsonObjectFree(tmp);
 227                         }
 228
 229                         ap_rputs(buf, r);
 230
 231                         free(statusname);
 232                         free(statustext);
 233                 }
 234
 235                 /* insert the status code */
 236                 char buf[32];
 237                 bzero(buf,32);
 238
 239                 if (isXML)
 240                         snprintf(buf, 32, "<status>%d</status>", statuscode );
 241                 else
 242                         snprintf(buf, 32, ",\"status\":%d", statuscode );
 243
 244                 ap_rputs( buf, r );
 245
 246                 if (isXML)
 247                         ap_rputs("</response>", r);
 248                 else
 249                         ap_rputs( "}", r ); /* finish off the object */
 250
 251                 osrf_app_session_destroy(session);
 252         }
 253
 254         osrfLogInfo(OSRF_LOG_MARK, "Completed processing service=%s, method=%s", service, method);
 255         string_array_destroy(params);
 256         string_array_destroy(mparams);
 257
 258         osrfLogDebug(OSRF_LOG_MARK, "Gateway served %d requests", ++numserved);
 259
 260         return ret;
 261 }
 262
 263
 264
 265 static void osrf_json_gateway_register_hooks (apr_pool_t *p) {
 266         ap_hook_handler(osrf_json_gateway_method_handler, NULL, NULL, APR_HOOK_MIDDLE);
 267         ap_hook_child_init(osrf_json_gateway_child_init,NULL,NULL,APR_HOOK_MIDDLE);
 268 }
 269
 270
 271 module AP_MODULE_DECLARE_DATA osrf_json_gateway_module = {
 272         STANDARD20_MODULE_STUFF,
 273         NULL,
 274         NULL,
 275         osrf_json_gateway_create_config,
 276         NULL,
 277         osrf_json_gateway_cmds,
 278         osrf_json_gateway_register_hooks,
 279 };
 280
 281
 282
 283