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 "objson/object.h"
   5 #include "objson/json2xml.h"
   6
   7 #define MODULE_NAME "osrf_json_gateway_module"
   8 #define GATEWAY_CONFIG "OSRFGatewayConfig"
   9 #define CONFIG_CONTEXT "gateway"
  10
  11 #define GATEWAY_DEFAULT_CONFIG "/openils/conf/opensrf_core.xml"
  12
  13
  14 /* our config structure */
  15 typedef struct {
  16         char* configfile;  /* our bootstrap config file */
  17 } osrf_json_gateway_config;
  18
  19 module AP_MODULE_DECLARE_DATA osrf_json_gateway_module;
  20
  21 char* osrf_json_gateway_config_file = NULL;
  22 int bootstrapped = 0;
  23
  24 static const char* osrf_json_gateway_set_config(cmd_parms *parms, void *config, const char *arg) {
  25         osrf_json_gateway_config  *cfg;
  26         cfg = ap_get_module_config(parms->server->module_config, &osrf_json_gateway_module);
  27         cfg->configfile = (char*) arg;
  28         osrf_json_gateway_config_file = (char*) arg;
  29         return NULL;
  30 }
  31
  32 /* tell apache about our commands */
  33 static const command_rec osrf_json_gateway_cmds[] = {
  34         AP_INIT_TAKE1( GATEWAY_CONFIG, osrf_json_gateway_set_config,
  35                         NULL, RSRC_CONF, "osrf json gateway config file"),
  36         {NULL}
  37 };
  38
  39 /* build the config object */
  40 static void* osrf_json_gateway_create_config( apr_pool_t* p, server_rec* s) {
  41         osrf_json_gateway_config* cfg = (osrf_json_gateway_config*)
  42                         apr_palloc(p, sizeof(osrf_json_gateway_config));
  43         cfg->configfile = GATEWAY_DEFAULT_CONFIG;
  44         return (void*) cfg;
  45 }
  46
  47
  48 static void osrf_json_gateway_child_init(apr_pool_t *p, server_rec *s) {
  49
  50         char* cfg = osrf_json_gateway_config_file;
  51         if( ! osrf_system_bootstrap_client( cfg, CONFIG_CONTEXT) ) {
  52                 ap_log_error( APLOG_MARK, APLOG_ERR, 0, s, "Unable to Bootstrap OpenSRF Client..");
  53                 return;
  54         }
  55         bootstrapped = 1;
  56         ap_log_error( APLOG_MARK, APLOG_DEBUG, 0, s, "Bootstrapping OpenSRF Client..");
  57 }
  58
  59 static int osrf_json_gateway_method_handler (request_rec *r) {
  60
  61         /* make sure we're needed first thing*/
  62         if (strcmp(r->handler, MODULE_NAME )) return DECLINED;
  63
  64         /* verify we are connected */
  65         if( !bootstrapped || !osrf_system_get_transport_client()) {
  66                 ap_log_rerror( APLOG_MARK, APLOG_ERR, 0, r, "Cannot process request "
  67                                 "because the OpenSRF JSON gateway has not been bootstrapped...");
  68                 return HTTP_INTERNAL_SERVER_ERROR;
  69         }
  70
  71
  72         osrfLogSetAppname("osrf_json_gw");
  73
  74         char* service                           = NULL; /* service to connect to */
  75         char* method                            = NULL; /* method to perform */
  76         char* format                            = NULL; /* method to perform */
  77         char* a_l                               = NULL; /* request api level */
  78         int   isXML                             = 0;
  79         int   api_level                         = 1;
  80
  81         r->allowed |= (AP_METHOD_BIT << M_GET);
  82         r->allowed |= (AP_METHOD_BIT << M_POST);
  83
  84         string_array* mparams   = NULL;
  85         string_array* params            = apacheParseParms(r); /* free me */
  86         service         = apacheGetFirstParamValue( params, "service" );
  87         method          = apacheGetFirstParamValue( params, "method" );
  88         format          = apacheGetFirstParamValue( params, "format" );
  89         a_l             = apacheGetFirstParamValue( params, "api_level" );
  90         mparams         = apacheGetParamValues( params, "param" ); /* free me */
  91
  92         if (a_l)
  93                 api_level = atoi(a_l);
  94
  95         if (format && !strcasecmp(format, "xml" )) {
  96                 isXML = 1;
  97                 ap_set_content_type(r, "application/xml");
  98         } else {
  99                 ap_set_content_type(r, "text/plain");
 100         }
 101
 102
 103         if( service && method ) {
 104
 105                 osrfLogInfo( OSRF_LOG_MARK,  "service=%s, method=%s", service, method );
 106                 osrfAppSession* session = osrf_app_client_session_init(service);
 107                 int req_id = osrf_app_session_make_req( session, NULL, method, api_level, mparams );
 108                 osrf_message* omsg = NULL;
 109
 110                 int statuscode = 200;
 111
 112                 /* kick off the object */
 113                 if (isXML)
 114                         ap_rputs("<response xmlns=\"http://opensrf.org/-/namespaces/gateway/v1\"><payload>", r);
 115                 else
 116                         ap_rputs("{\"payload\":[", r);
 117
 118                 int morethan1           = 0;
 119                 char* statusname        = NULL;
 120                 char* statustext        = NULL;
 121                 char* output            = NULL;
 122
 123                 while((omsg = osrfAppSessionRequestRecv( session, req_id, 60 ))) {
 124
 125                         statuscode = omsg->status_code;
 126                         jsonObject* res;
 127
 128                         if( ( res = osrfMessageGetResult(omsg)) ) {
 129
 130                                 if (isXML) {
 131                                         output = jsonObjectToXML( res );
 132                                 } else {
 133                                         output = jsonObjectToJSON( res );
 134                                         if( morethan1 ) ap_rputs(",", r); /* comma between JSON array items */
 135                                 }
 136                                 ap_rputs(output, r);
 137                                 free(output);
 138                                 morethan1 = 1;
 139
 140                         } else {
 141
 142                                 if( statuscode > 299 ) { /* the request returned a low level error */
 143                                         statusname = omsg->status_name ? strdup(omsg->status_name) : strdup("Unknown Error");
 144                                         statustext = omsg->status_text ? strdup(omsg->status_text) : strdup("No Error Message");
 145                                         osrfLogError( OSRF_LOG_MARK,  "Gateway received error: %s", statustext );
 146                                 }
 147                         }
 148
 149                         osrf_message_free(omsg);
 150                         if(statusname) break;
 151                 }
 152
 153                 if (isXML)
 154                         ap_rputs("</payload>", r);
 155                 else
 156                         ap_rputs("]",r); /* finish off the payload array */
 157
 158                 if(statusname) {
 159
 160                         /* add a debug field if the request died */
 161                         ap_log_rerror( APLOG_MARK, APLOG_INFO, 0, r,
 162                                         "OpenSRF JSON Request returned error: %s -> %s", statusname, statustext );
 163                         int l = strlen(statusname) + strlen(statustext) + 32;
 164                         char buf[l];
 165                         bzero(buf,l);
 166
 167                         if (isXML)
 168                                 snprintf( buf, l, "<debug>\"%s : %s\"</debug>", statusname, statustext );
 169                         else
 170                                 snprintf( buf, l, ",\"debug\":\"%s : %s\"", statusname, statustext );
 171
 172                         ap_rputs(buf, r);
 173
 174                         free(statusname);
 175                         free(statustext);
 176                 }
 177
 178                 /* insert the status code */
 179                 char buf[32];
 180                 bzero(buf,32);
 181
 182                 if (isXML)
 183                         snprintf(buf, 32, "<status>%d</status>", statuscode );
 184                 else
 185                         snprintf(buf, 32, ",\"status\":%d", statuscode );
 186
 187                 ap_rputs( buf, r );
 188
 189                 if (isXML)
 190                         ap_rputs("</response>", r);
 191                 else
 192                         ap_rputs( "}", r ); /* finish off the object */
 193
 194                 osrf_app_session_destroy(session);
 195         }
 196
 197         string_array_destroy(params);
 198         string_array_destroy(mparams);
 199
 200         return OK;
 201 }
 202
 203 static void osrf_json_gateway_register_hooks (apr_pool_t *p) {
 204         ap_hook_handler(osrf_json_gateway_method_handler, NULL, NULL, APR_HOOK_MIDDLE);
 205         ap_hook_child_init(osrf_json_gateway_child_init,NULL,NULL,APR_HOOK_MIDDLE);
 206 }
 207
 208
 209 module AP_MODULE_DECLARE_DATA osrf_json_gateway_module = {
 210         STANDARD20_MODULE_STUFF,
 211         NULL,
 212         NULL,
 213         osrf_json_gateway_create_config,
 214         NULL,
 215         osrf_json_gateway_cmds,
 216         osrf_json_gateway_register_hooks,
 217 };
 218
 219
 220
 221