3 @brief As a server, perform database queries as defined in the database itself.
10 #include "opensrf/utils.h"
11 #include "opensrf/log.h"
12 #include "opensrf/osrf_json.h"
13 #include "opensrf/osrf_application.h"
14 #include "openils/oils_utils.h"
15 #include "openils/oils_sql.h"
16 #include "openils/oils_buildq.h"
19 @brief Information about a previously prepared query.
21 We store an osrfHash of CachedQueries in the userData area of the application session,
22 keyed on query token. That way we can fetch what a previous call to the prepare method
30 static dbi_conn dbhandle; /* our db connection */
32 static const char modulename[] = "open-ils.qstore";
34 int doPrepare( osrfMethodContext* ctx );
35 int doExecute( osrfMethodContext* ctx );
36 int doSql( osrfMethodContext* ctx );
38 static const char* save_query(
39 osrfMethodContext* ctx, BuildSQLState* state, StoredQ* query );
40 static void free_cached_query( char* key, void* data );
41 static void userDataFree( void* blob );
42 static CachedQuery* search_token( osrfMethodContext* ctx, const char* token );
45 @brief Disconnect from the database.
47 This function is called when the server drone is about to terminate.
49 void osrfAppChildExit() {
50 osrfLogDebug( OSRF_LOG_MARK, "Child is exiting, disconnecting from database..." );
53 dbi_conn_query( dbhandle, "ROLLBACK;" );
54 dbi_conn_close( dbhandle );
60 @brief Initialize the application.
61 @return Zero if successful, or non-zero if not.
63 Load the IDL file into an internal data structure for future reference. Each non-virtual
64 class in the IDL corresponds to a table or view in the database, or to a subquery defined
65 in the IDL. Ignore all virtual tables and virtual fields.
67 Register the functions for remote procedure calls.
69 This function is called when the registering the application, and is executed by the
70 listener before spawning the drones.
72 int osrfAppInitialize() {
74 osrfLogInfo( OSRF_LOG_MARK, "Initializing the QStore Server..." );
75 osrfLogInfo( OSRF_LOG_MARK, "Finding XML file..." );
77 if ( !oilsIDLInit( osrf_settings_host_value( "/IDL" )))
78 return 1; /* return non-zero to indicate error */
80 growing_buffer* method_name = buffer_init( 64 );
82 OSRF_BUFFER_ADD( method_name, modulename );
83 OSRF_BUFFER_ADD( method_name, ".prepare" );
84 osrfAppRegisterMethod( modulename, OSRF_BUFFER_C_STR( method_name ),
85 "doPrepare", "", 1, 0 );
87 buffer_reset( method_name );
88 OSRF_BUFFER_ADD( method_name, modulename );
89 OSRF_BUFFER_ADD( method_name, ".bind_param" );
90 osrfAppRegisterMethod( modulename, OSRF_BUFFER_C_STR( method_name ),
91 "doBindParam", "", 2, 0 );
93 buffer_reset( method_name );
94 OSRF_BUFFER_ADD( method_name, modulename );
95 OSRF_BUFFER_ADD( method_name, ".execute" );
96 osrfAppRegisterMethod( modulename, OSRF_BUFFER_C_STR( method_name ),
97 "doExecute", "", 1, OSRF_METHOD_STREAMING );
99 buffer_reset( method_name );
100 OSRF_BUFFER_ADD( method_name, modulename );
101 OSRF_BUFFER_ADD( method_name, ".sql" );
102 osrfAppRegisterMethod( modulename, OSRF_BUFFER_C_STR( method_name ),
103 "doSql", "", 1, OSRF_METHOD_STREAMING );
105 buffer_reset( method_name );
106 OSRF_BUFFER_ADD( method_name, modulename );
107 OSRF_BUFFER_ADD( method_name, ".finish" );
108 osrfAppRegisterMethod( modulename, OSRF_BUFFER_C_STR( method_name ),
109 "doFinish", "", 1, 0 );
115 @brief Initialize a server drone.
116 @return Zero if successful, -1 if not.
118 Connect to the database. For each non-virtual class in the IDL, execute a dummy "SELECT * "
119 query to get the datatype of each column. Record the datatypes in the loaded IDL.
121 This function is called by a server drone shortly after it is spawned by the listener.
123 int osrfAppChildInit() {
125 osrfLogDebug( OSRF_LOG_MARK, "Attempting to initialize libdbi..." );
126 dbi_initialize( NULL );
127 osrfLogDebug( OSRF_LOG_MARK, "... libdbi initialized." );
129 char* driver = osrf_settings_host_value( "/apps/%s/app_settings/driver", modulename );
130 char* user = osrf_settings_host_value( "/apps/%s/app_settings/database/user", modulename );
131 char* host = osrf_settings_host_value( "/apps/%s/app_settings/database/host", modulename );
132 char* port = osrf_settings_host_value( "/apps/%s/app_settings/database/port", modulename );
133 char* db = osrf_settings_host_value( "/apps/%s/app_settings/database/db", modulename );
134 char* pw = osrf_settings_host_value( "/apps/%s/app_settings/database/pw", modulename );
136 osrfLogDebug( OSRF_LOG_MARK, "Attempting to load the database driver [%s]...", driver );
137 dbhandle = dbi_conn_new( driver );
140 osrfLogError( OSRF_LOG_MARK, "Error loading database driver [%s]", driver );
143 osrfLogDebug( OSRF_LOG_MARK, "Database driver [%s] seems OK", driver );
145 osrfLogInfo(OSRF_LOG_MARK, "%s connecting to database. host=%s, "
146 "port=%s, user=%s, db=%s", modulename, host, port, user, db );
148 if( host ) dbi_conn_set_option( dbhandle, "host", host );
149 if( port ) dbi_conn_set_option_numeric( dbhandle, "port", atoi( port ) );
150 if( user ) dbi_conn_set_option( dbhandle, "username", user );
151 if( pw ) dbi_conn_set_option( dbhandle, "password", pw );
152 if( db ) dbi_conn_set_option( dbhandle, "dbname", db );
161 if( dbi_conn_connect( dbhandle ) < 0 ) {
163 if( dbi_conn_connect( dbhandle ) < 0 ) {
164 dbi_conn_error( dbhandle, &err );
165 osrfLogError( OSRF_LOG_MARK, "Error connecting to database: %s", err );
170 oilsSetDBConnection( dbhandle );
171 osrfLogInfo( OSRF_LOG_MARK, "%s successfully connected to the database", modulename );
173 // Add datatypes from database to the fields in the IDL
174 if( oilsExtendIDL() ) {
175 osrfLogError( OSRF_LOG_MARK, "Error extending the IDL" );
183 @brief Load a specified query from the database query tables.
184 @param ctx Pointer to the current method context.
185 @return Zero if successful, or -1 if not.
188 - query id (key of query.stored_query table)
190 Returns: a character string serving as a token for future references to the query.
192 NB: the method return type is temporary. Eventually this method will return both a token
193 and a list of bind variables.
195 int doPrepare( osrfMethodContext* ctx ) {
196 if(osrfMethodVerifyContext( ctx )) {
197 osrfLogError( OSRF_LOG_MARK, "Invalid method context" );
201 // Get the query id from a method parameter
202 const jsonObject* query_id_obj = jsonObjectGetIndex( ctx->params, 0 );
203 if( query_id_obj->type != JSON_NUMBER ) {
204 osrfAppSessionStatus( ctx->session, OSRF_STATUS_BADREQUEST, "osrfMethodException",
205 ctx->request, "Invalid parameter; query id must be a number" );
209 int query_id = atoi( jsonObjectGetString( query_id_obj ));
210 if( query_id <= 0 ) {
211 osrfAppSessionStatus( ctx->session, OSRF_STATUS_BADREQUEST, "osrfMethodException",
212 ctx->request, "Invalid parameter: query id must be greater than zero" );
216 osrfLogInfo( OSRF_LOG_MARK, "Loading query for id # %d", query_id );
218 BuildSQLState* state = buildSQLStateNew( dbhandle );
219 StoredQ* query = getStoredQuery( state, query_id );
221 osrfLogWarning( OSRF_LOG_MARK, "Unable to load stored query # %d", query_id );
222 osrfAppSessionStatus( ctx->session, OSRF_STATUS_BADREQUEST, "osrfMethodException",
223 ctx->request, "Unable to load stored query" );
227 const char* token = save_query( ctx, state, query );
229 osrfLogInfo( OSRF_LOG_MARK, "Token for query id # %d is \"%s\"", query_id, token );
231 osrfAppRespondComplete( ctx, jsonNewObject( token ));
235 int doBindParam( osrfMethodContext* ctx ) {
236 if(osrfMethodVerifyContext( ctx )) {
237 osrfLogError( OSRF_LOG_MARK, "Invalid method context" );
241 // Get the query token from a method parameter
242 const jsonObject* token_obj = jsonObjectGetIndex( ctx->params, 0 );
243 if( token_obj->type != JSON_STRING ) {
244 osrfAppSessionStatus( ctx->session, OSRF_STATUS_BADREQUEST, "osrfMethodException",
245 ctx->request, "Invalid parameter; query token must be a string" );
248 const char* token = jsonObjectGetString( token_obj );
250 // Look up the query token in the session-level userData
251 CachedQuery* query = search_token( ctx, token );
253 osrfAppSessionStatus( ctx->session, OSRF_STATUS_BADREQUEST, "osrfMethodException",
254 ctx->request, "Invalid query token" );
258 osrfLogInfo( OSRF_LOG_MARK, "Binding parameter(s) for token %s", token );
260 osrfAppRespondComplete( ctx, jsonNewObject( "build method not yet implemented" ));
264 int doExecute( osrfMethodContext* ctx ) {
265 if(osrfMethodVerifyContext( ctx )) {
266 osrfLogError( OSRF_LOG_MARK, "Invalid method context" );
270 // Get the query token
271 const jsonObject* token_obj = jsonObjectGetIndex( ctx->params, 0 );
272 if( token_obj->type != JSON_STRING ) {
273 osrfAppSessionStatus( ctx->session, OSRF_STATUS_BADREQUEST, "osrfMethodException",
274 ctx->request, "Invalid parameter; query token must be a string" );
277 const char* token = jsonObjectGetString( token_obj );
279 // Look up the query token in the session-level userData
280 CachedQuery* query = search_token( ctx, token );
282 osrfAppSessionStatus( ctx->session, OSRF_STATUS_BADREQUEST, "osrfMethodException",
283 ctx->request, "Invalid query token" );
287 osrfLogInfo( OSRF_LOG_MARK, "Executing query for token \"%s\"", token );
289 osrfAppRespondComplete( ctx, jsonNewObject( "execute method not yet implemented" ));
293 int doSql( osrfMethodContext* ctx ) {
294 if(osrfMethodVerifyContext( ctx )) {
295 osrfLogError( OSRF_LOG_MARK, "Invalid method context" );
299 // Get the query token
300 const jsonObject* token_obj = jsonObjectGetIndex( ctx->params, 0 );
301 if( token_obj->type != JSON_STRING ) {
302 osrfAppSessionStatus( ctx->session, OSRF_STATUS_BADREQUEST, "osrfMethodException",
303 ctx->request, "Invalid parameter; query token must be a string" );
306 const char* token = jsonObjectGetString( token_obj );
308 // Look up the query token in the session-level userData
309 CachedQuery* query = search_token( ctx, token );
311 osrfAppSessionStatus( ctx->session, OSRF_STATUS_BADREQUEST, "osrfMethodException",
312 ctx->request, "Invalid query token" );
316 osrfLogInfo( OSRF_LOG_MARK, "Returning SQL for token \"%s\"", token );
317 if( query->state->error ) {
318 osrfLogWarning( OSRF_LOG_MARK, "No valid prepared query available for query id # %d",
320 osrfAppSessionStatus( ctx->session, OSRF_STATUS_BADREQUEST, "osrfMethodException",
321 ctx->request, "No valid prepared query available" );
323 } else if( buildSQL( query->state, query->query )) {
324 osrfLogWarning( OSRF_LOG_MARK, "Unable to build SQL statement for query id # %d",
326 osrfAppSessionStatus( ctx->session, OSRF_STATUS_BADREQUEST, "osrfMethodException",
327 ctx->request, "Unable to build SQL statement" );
331 osrfAppRespondComplete( ctx, jsonNewObject( OSRF_BUFFER_C_STR( query->state->sql )));
335 int doFinish( osrfMethodContext* ctx ) {
336 if(osrfMethodVerifyContext( ctx )) {
337 osrfLogError( OSRF_LOG_MARK, "Invalid method context" );
341 // Get the query token.
342 const jsonObject* token_obj = jsonObjectGetIndex( ctx->params, 0 );
343 if( token_obj->type != JSON_STRING ) {
344 osrfAppSessionStatus( ctx->session, OSRF_STATUS_BADREQUEST, "osrfMethodException",
345 ctx->request, "Invalid parameter; query token must be a string" );
348 const char* token = jsonObjectGetString( token_obj );
350 // Delete the corresponding entry from the cache. If there is no cache, or no such entry,
351 // just ignore the problem and report success.
352 osrfHash* cache = ctx->session->userData;
354 osrfHashRemove( cache, token );
356 osrfAppRespondComplete( ctx, NULL );
361 @brief Save a query in session-level userData for reference in future method calls.
362 @param ctx Pointer to the current method context.
363 @param state Pointer to the state of the query.
364 @param query Pointer to the abstract representation of the query.
365 @return Pointer to an identifying token to be returned to the client.
367 static const char* save_query(
368 osrfMethodContext* ctx, BuildSQLState* state, StoredQ* query ) {
370 CachedQuery* cached_query = safe_malloc( sizeof( CachedQuery ));
371 cached_query->state = state;
372 cached_query->query = query;
374 // Get the cache. If we don't have one yet, make one.
375 osrfHash* cache = ctx->session->userData;
377 cache = osrfNewHash();
378 osrfHashSetCallback( cache, free_cached_query );
379 ctx->session->userData = cache;
380 ctx->session->userDataFree = userDataFree; // arrange to free it at end of session
383 // Create a token string to be used as a key
384 static unsigned int token_count = 0;
385 char* token = va_list_to_string(
386 "%u_%ld_%ld", ++token_count, (long) time( NULL ), (long) getpid() );
388 osrfHashSet( cache, cached_query, token );
393 @brief Free a CachedQuery
394 @param Pointer to the CachedQuery to be freed.
396 static void free_cached_query( char* key, void* data ) {
398 CachedQuery* cached_query = data;
399 buildSQLStateFree( cached_query->state );
400 storedQFree( cached_query->query );
405 @brief Callback for freeing session-level userData.
406 @param blob Opaque pointer t userData.
408 static void userDataFree( void* blob ) {
409 osrfHashFree( (osrfHash*) blob );
413 @brief Search for the cached query corresponding to a given token.
414 @param ctx Pointer to the current method context.
415 @param token Token string from a previous call to the prepare method.
416 @return A pointer to the cached query, if found, or NULL if not.
418 static CachedQuery* search_token( osrfMethodContext* ctx, const char* token ) {
419 if( ctx && ctx->session->userData && token ) {
420 osrfHash* cache = ctx->session->userData;
421 return osrfHashGet( cache, token );