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 #include <unistd.h>
  10
  11
  12 #define MODULE_NAME "osrf_json_gateway_module"
  13 #define GATEWAY_CONFIG "OSRFGatewayConfig"
  14 #define CONFIG_CONTEXT "gateway"
  15
  16 #define GATEWAY_DEFAULT_CONFIG "/openils/conf/opensrf_core.xml"
  17
  18
  19 /* our config structure */
  20 typedef struct {
  21         char* configfile;  /* our bootstrap config file */
  22 } osrf_json_gateway_config;
  23
  24 module AP_MODULE_DECLARE_DATA osrf_json_gateway_module;
  25
  26 char* osrf_json_gateway_config_file = NULL;
  27 int bootstrapped = 0;
  28 int numserved = 0;
  29 osrfStringArray* allowedServices = NULL;
  30
  31 static const char* osrf_json_gateway_set_config(cmd_parms *parms, void *config, const char *arg) {
  32         osrf_json_gateway_config  *cfg;
  33         cfg = ap_get_module_config(parms->server->module_config, &osrf_json_gateway_module);
  34         cfg->configfile = (char*) arg;
  35         osrf_json_gateway_config_file = (char*) arg;
  36         return NULL;
  37 }
  38
  39 /* tell apache about our commands */
  40 static const command_rec osrf_json_gateway_cmds[] = {
  41         AP_INIT_TAKE1( GATEWAY_CONFIG, osrf_json_gateway_set_config,
  42                         NULL, RSRC_CONF, "osrf json gateway config file"),
  43         {NULL}
  44 };
  45
  46 /* build the config object */
  47 static void* osrf_json_gateway_create_config( apr_pool_t* p, server_rec* s) {
  48         osrf_json_gateway_config* cfg = (osrf_json_gateway_config*)
  49                         apr_palloc(p, sizeof(osrf_json_gateway_config));
  50         cfg->configfile = GATEWAY_DEFAULT_CONFIG;
  51         return (void*) cfg;
  52 }
  53
  54
  55 static void osrf_json_gateway_child_init(apr_pool_t *p, server_rec *s) {
  56
  57         char* cfg = osrf_json_gateway_config_file;
  58         char buf[32];
  59         memset(buf, 0x0, 32);
  60         int t = time(NULL);
  61         snprintf(buf, 32, "%d", t);
  62
  63         if( ! osrfSystemBootstrapClientResc( cfg, CONFIG_CONTEXT, buf ) ) {
  64                 ap_log_error( APLOG_MARK, APLOG_ERR, 0, s,
  65                         "Unable to Bootstrap OpenSRF Client with config %s..", cfg);
  66                 return;
  67         }
  68
  69         bootstrapped = 1;
  70         allowedServices = osrfNewStringArray(8);
  71         osrfLogInfo(OSRF_LOG_MARK, "Bootstrapping gateway child for requests");
  72         osrfConfigGetValueList( NULL, allowedServices, "/services/service" );
  73
  74         int i;
  75         for( i = 0; i < allowedServices->size; i++ ) {
  76                 ap_log_error( APLOG_MARK, APLOG_DEBUG, 0, s,
  77                         "allowed service: %s\n", osrfStringArrayGetString(allowedServices, i));
  78         }
  79 }
  80
  81 static int osrf_json_gateway_method_handler (request_rec *r) {
  82
  83         /* make sure we're needed first thing*/
  84         if (strcmp(r->handler, MODULE_NAME )) return DECLINED;
  85
  86         osrfLogDebug(OSRF_LOG_MARK, "osrf gateway: entered request handler");
  87
  88         /* verify we are connected */
  89         if( !bootstrapped || !osrf_system_get_transport_client()) {
  90                 ap_log_rerror( APLOG_MARK, APLOG_ERR, 0, r, "Cannot process request "
  91                                 "because the OpenSRF JSON gateway has not been bootstrapped...");
  92                 usleep( 100000 ); /* 100 milliseconds */
  93                 exit(1);
  94         }
  95
  96         osrfLogSetAppname("osrf_json_gw");
  97
  98         char* service           = NULL; /* service to connect to */
  99         char* method            = NULL; /* method to perform */
 100         char* format            = NULL; /* method to perform */
 101         char* a_l                       = NULL; /* request api level */
 102         int   isXML                     = 0;
 103         int   api_level = 1;
 104
 105         r->allowed |= (AP_METHOD_BIT << M_GET);
 106         r->allowed |= (AP_METHOD_BIT << M_POST);
 107
 108         osrfLogDebug(OSRF_LOG_MARK, "osrf gateway: parsing URL params");
 109         string_array* mparams   = NULL;
 110         string_array* params            = apacheParseParms(r); /* free me */
 111         service         = apacheGetFirstParamValue( params, "service" );
 112         method          = apacheGetFirstParamValue( params, "method" );
 113         format          = apacheGetFirstParamValue( params, "format" );
 114         a_l                     = apacheGetFirstParamValue( params, "api_level" );
 115         mparams         = apacheGetParamValues( params, "param" ); /* free me */
 116
 117         if (a_l)
 118                 api_level = atoi(a_l);
 119
 120         if (format && !strcasecmp(format, "xml" )) {
 121                 isXML = 1;
 122                 ap_set_content_type(r, "application/xml");
 123         } else {
 124                 ap_set_content_type(r, "text/plain");
 125         }
 126
 127         int ret = OK;
 128
 129         if(!(service && method) ||
 130                 !osrfStringArrayContains(allowedServices, service)) {
 131
 132                 osrfLogError(OSRF_LOG_MARK,
 133                         "Service [%s] not found or not allowed", service);
 134                 ret = HTTP_NOT_FOUND;
 135
 136         } else {
 137
 138                 /* This will log all heaers to the apache error log
 139                 const apr_array_header_t* arr = apr_table_elts(r->headers_in);
 140                 const void* ptr;
 141
 142                 while( (ptr = apr_array_pop(arr)) ) {
 143                         apr_table_entry_t* e = (apr_table_entry_t*) ptr;
 144                         fprintf(stderr, "Table entry: %s : %s\n", e->key, e->val );
 145                 }
 146                 fflush(stderr);
 147                 */
 148
 149
 150                 /* ----------------------------------------------------------------- */
 151                 /* log all requests to the activity log */
 152                 const char* authtoken = apr_table_get(r->headers_in, "X-OILS-Authtoken");
 153                 if(!authtoken) authtoken = "";
 154                 growing_buffer* act = buffer_init(128);
 155                 buffer_fadd(act, "[%s] [%s] %s %s", r->connection->remote_ip, authtoken, service, method );
 156                 char* str; int i = 0;
 157                 while( (str = osrfStringArrayGetString(mparams, i++)) )
 158                         if( i == 1 ) buffer_fadd(act, " %s", str);
 159                         else buffer_fadd(act, ", %s", str);
 160
 161                 osrfLogActivity( OSRF_LOG_MARK, act->buf );
 162                 buffer_free(act);
 163                 /* ----------------------------------------------------------------- */
 164
 165                 osrfAppSession* session = osrf_app_client_session_init(service);
 166
 167                 double starttime = get_timestamp_millis();
 168                 int req_id = osrf_app_session_make_req( session, NULL, method, api_level, mparams );
 169
 170
 171                 if( req_id == -1 ) {
 172                         osrfLogError(OSRF_LOG_MARK, "I am unable to communcate with opensrf..going away...");
 173                         /* we don't want to spawn an intense re-forking storm
 174                          * if there is no jabber server.. so give it some time before we die */
 175                         usleep( 100000 ); /* 100 milliseconds */
 176                         exit(1);
 177                 }
 178
 179                 osrf_message* omsg = NULL;
 180
 181                 int statuscode = 200;
 182
 183                 /* kick off the object */
 184                 if (isXML)
 185                         ap_rputs("<response xmlns=\"http://opensrf.org/-/namespaces/gateway/v1\"><payload>", r);
 186                 else
 187                         ap_rputs("{\"payload\":[", r);
 188
 189                 int morethan1           = 0;
 190                 char* statusname        = NULL;
 191                 char* statustext        = NULL;
 192                 char* output            = NULL;
 193
 194                 while((omsg = osrfAppSessionRequestRecv( session, req_id, 60 ))) {
 195
 196                         statuscode = omsg->status_code;
 197                         jsonObject* res;
 198
 199                         if( ( res = osrfMessageGetResult(omsg)) ) {
 200
 201                                 if (isXML) {
 202                                         output = jsonObjectToXML( res );
 203                                 } else {
 204                                         output = jsonObjectToJSON( res );
 205                                         if( morethan1 ) ap_rputs(",", r); /* comma between JSON array items */
 206                                 }
 207                                 ap_rputs(output, r);
 208                                 free(output);
 209                                 morethan1 = 1;
 210
 211                         } else {
 212
 213                                 if( statuscode > 299 ) { /* the request returned a low level error */
 214                                         statusname = omsg->status_name ? strdup(omsg->status_name) : strdup("Unknown Error");
 215                                         statustext = omsg->status_text ? strdup(omsg->status_text) : strdup("No Error Message");
 216                                         osrfLogError( OSRF_LOG_MARK,  "Gateway received error: %s", statustext );
 217                                 }
 218                         }
 219
 220                         osrf_message_free(omsg);
 221                         if(statusname) break;
 222                 }
 223
 224                 double duration = get_timestamp_millis() - starttime;
 225                 osrfLogDebug(OSRF_LOG_MARK, "gateway request took %lf seconds", duration);
 226
 227
 228                 if (isXML)
 229                         ap_rputs("</payload>", r);
 230                 else
 231                         ap_rputs("]",r); /* finish off the payload array */
 232
 233                 if(statusname) {
 234
 235                         /* add a debug field if the request died */
 236                         ap_log_rerror( APLOG_MARK, APLOG_INFO, 0, r,
 237                                         "OpenSRF JSON Request returned error: %s -> %s", statusname, statustext );
 238                         int l = strlen(statusname) + strlen(statustext) + 32;
 239                         char buf[l];
 240                         bzero(buf,l);
 241
 242                         if (isXML)
 243                                 snprintf( buf, l, "<debug>\"%s : %s\"</debug>", statusname, statustext );
 244
 245                         else {
 246                                 char bb[l];
 247                                 bzero(bb, l);
 248                                 snprintf(bb, l,  "%s : %s", statusname, statustext);
 249                                 jsonObject* tmp = jsonNewObject(bb);
 250                                 char* j = jsonObjectToJSON(tmp);
 251                                 snprintf( buf, l, ",\"debug\": %s", j);
 252                                 free(j);
 253                                 jsonObjectFree(tmp);
 254                         }
 255
 256                         ap_rputs(buf, r);
 257
 258                         free(statusname);
 259                         free(statustext);
 260                 }
 261
 262                 /* insert the status code */
 263                 char buf[32];
 264                 bzero(buf,32);
 265
 266                 if (isXML)
 267                         snprintf(buf, 32, "<status>%d</status>", statuscode );
 268                 else
 269                         snprintf(buf, 32, ",\"status\":%d", statuscode );
 270
 271                 ap_rputs( buf, r );
 272
 273                 if (isXML)
 274                         ap_rputs("</response>", r);
 275                 else
 276                         ap_rputs( "}", r ); /* finish off the object */
 277
 278                 osrf_app_session_destroy(session);
 279         }
 280
 281         osrfLogInfo(OSRF_LOG_MARK, "Completed processing service=%s, method=%s", service, method);
 282         string_array_destroy(params);
 283         string_array_destroy(mparams);
 284
 285         osrfLogDebug(OSRF_LOG_MARK, "Gateway served %d requests", ++numserved);
 286
 287         return ret;
 288 }
 289
 290
 291
 292 static void osrf_json_gateway_register_hooks (apr_pool_t *p) {
 293         ap_hook_handler(osrf_json_gateway_method_handler, NULL, NULL, APR_HOOK_MIDDLE);
 294         ap_hook_child_init(osrf_json_gateway_child_init,NULL,NULL,APR_HOOK_MIDDLE);
 295 }
 296
 297
 298 module AP_MODULE_DECLARE_DATA osrf_json_gateway_module = {
 299         STANDARD20_MODULE_STUFF,
 300         NULL,
 301         NULL,
 302         osrf_json_gateway_create_config,
 303         NULL,
 304         osrf_json_gateway_cmds,
 305         osrf_json_gateway_register_hooks,
 306 };
 307
 308
 309
 310