src/c-apps/osrf_math.c

   1 #include "opensrf/osrf_app_session.h"
   2 #include "opensrf/osrf_application.h"
   3 #include "objson/object.h"
   4 #include "opensrf/osrf_log.h"
   5
   6 #define MODULENAME "opensrf.math"
   7
   8 int osrfAppInitialize();
   9 int osrfAppChildInit();
  10 int osrfMathRun( osrfMethodContext* );
  11
  12
  13 int osrfAppInitialize() {
  14
  15         osrfAppRegisterMethod(
  16                         MODULENAME,                             /* which application has this method */
  17                         "add",                                  /* the name of the method */
  18                         "osrfMathRun",                  /* the symbol that runs the method */
  19                         "Adds two numbers",     /* description of the method */
  20                         "( num1, num2 )",               /* description of the method params */
  21                         2,                                                      /* the minimum number of params required to run the method */
  22                         0 );                                            /* streaming method? yes / no */
  23
  24         osrfAppRegisterMethod(
  25                         MODULENAME,
  26                         "sub",
  27                         "osrfMathRun",
  28                         "Subtracts two numbers",
  29                         "( num1, num2 )", 2, 0 );
  30
  31         osrfAppRegisterMethod(
  32                         MODULENAME,
  33                         "mult",
  34                         "osrfMathRun",
  35                         "Multiplies two numbers",
  36                         "( num1, num2 )", 2, 0 );
  37
  38         osrfAppRegisterMethod(
  39                         MODULENAME,
  40                         "div",
  41                         "osrfMathRun",
  42                         "Divides two numbers",
  43                         "( num1, num2 )", 2, 0 );
  44
  45         return 0;
  46 }
  47
  48 int osrfAppChildInit() {
  49         return 0;
  50 }
  51
  52 int osrfMathRun( osrfMethodContext* ctx ) {
  53
  54         OSRF_METHOD_VERIFY_CONTEXT(ctx); /* see osrf_application.h */
  55
  56         osrfLog( OSRF_DEBUG, "Running opensrf.math %s", ctx->method->name );
  57
  58         /* collect the request params */
  59         jsonObject* x = jsonObjectGetIndex(ctx->params, 0);
  60         jsonObject* y = jsonObjectGetIndex(ctx->params, 1);
  61
  62         if( x && y ) {
  63
  64                 /* pull out the params as strings since they may be either
  65                         strings or numbers depending on the client */
  66                 char* a = jsonObjectToSimpleString(x);
  67                 char* b = jsonObjectToSimpleString(y);
  68
  69                 if( a && b ) {
  70
  71                         /* construct a new params object to send to dbmath */
  72                         jsonObject* newParams = jsonParseString( "[ %s, %s ]", a, b );
  73                         free(a); free(b);
  74
  75                         /* connect to db math */
  76                         osrfAppSession* ses = osrfAppSessionClientInit("opensrf.dbmath");
  77
  78                         /* dbmath uses the same method names that math does */
  79                         int req_id = osrfAppSessionMakeRequest( ses, newParams, ctx->method->name, 1, NULL );
  80                         osrfMessage* omsg = osrfAppSessionRequestRecv( ses, req_id, 60 );
  81
  82                         if(omsg) {
  83                                 /* return dbmath's response to the user */
  84                                 osrfAppRespondComplete( ctx, osrfMessageGetResult(omsg) );
  85                                 osrfMessageFree(omsg);
  86                                 osrfAppSessionFree(ses);
  87                                 return 0;
  88                         }
  89
  90                         osrfAppSessionFree(ses);
  91                 }
  92         }
  93
  94         return -1;
  95 }
  96
  97
  98