diff options
author | tilghman <tilghman@f38db490-d61c-443f-a65b-d21fe96a405b> | 2008-06-10 21:14:58 +0000 |
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committer | tilghman <tilghman@f38db490-d61c-443f-a65b-d21fe96a405b> | 2008-06-10 21:14:58 +0000 |
commit | 2a6397c89e0c4fe7beb267f1c2a53c103b0784af (patch) | |
tree | 63782d149f56bb06e85bbb2b6965ccf440e87442 /res/res_odbc.c | |
parent | e3f8a4c03c12f5957336ee3c3ffce325d1214bc4 (diff) |
Move the table cache routines to res_odbc, so they can be used from other
places (app_voicemail, for example).
(Related to bug #11678)
git-svn-id: http://svn.digium.com/svn/asterisk/trunk@121683 f38db490-d61c-443f-a65b-d21fe96a405b
Diffstat (limited to 'res/res_odbc.c')
-rw-r--r-- | res/res_odbc.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/res/res_odbc.c b/res/res_odbc.c index 964a0747b..2279096a9 100644 --- a/res/res_odbc.c +++ b/res/res_odbc.c @@ -69,6 +69,8 @@ struct odbc_class struct ao2_container *class_container; +static AST_RWLIST_HEAD_STATIC(odbc_tables, odbc_cache_tables); + static odbc_status odbc_obj_connect(struct odbc_obj *obj); static odbc_status odbc_obj_disconnect(struct odbc_obj *obj); static int odbc_register_class(struct odbc_class *class, int connect); @@ -102,6 +104,165 @@ static void odbc_obj_destructor(void *data) ao2_ref(obj->parent, -1); } +static void destroy_table_cache(struct odbc_cache_tables *table) { + struct odbc_cache_columns *col; + ast_debug(1, "Destroying table cache for %s\n", table->table); + AST_RWLIST_WRLOCK(&table->columns); + while ((col = AST_RWLIST_REMOVE_HEAD(&table->columns, list))) { + ast_free(col); + } + AST_RWLIST_UNLOCK(&table->columns); + AST_RWLIST_HEAD_DESTROY(&table->columns); + ast_free(table); +} + +/*! + * \brief Find or create an entry describing the table specified. + * \param obj An active ODBC handle on which to query the table + * \param table Tablename to describe + * \retval A structure describing the table layout, or NULL, if the table is not found or another error occurs. + * When a structure is returned, the contained columns list will be + * rdlock'ed, to ensure that it will be retained in memory. + */ +struct odbc_cache_tables *ast_odbc_find_table(const char *database, const char *tablename) +{ + struct odbc_cache_tables *tableptr; + struct odbc_cache_columns *entry; + char columnname[80]; + SQLLEN sqlptr; + SQLHSTMT stmt = NULL; + int res = 0, error = 0, try = 0; + struct odbc_obj *obj = ast_odbc_request_obj(database, 0); + + AST_RWLIST_RDLOCK(&odbc_tables); + AST_RWLIST_TRAVERSE(&odbc_tables, tableptr, list) { + if (strcmp(tableptr->connection, database) == 0 && strcmp(tableptr->table, tablename) == 0) { + break; + } + } + if (tableptr) { + AST_RWLIST_RDLOCK(&tableptr->columns); + AST_RWLIST_UNLOCK(&odbc_tables); + return tableptr; + } + + if (!obj) { + ast_log(LOG_WARNING, "Unable to retrieve database handle for table description '%s@%s'\n", tablename, database); + return NULL; + } + + /* Table structure not already cached; build it now. */ + do { +retry: + res = SQLAllocHandle(SQL_HANDLE_STMT, obj->con, &stmt); + if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) { + if (try == 0) { + try = 1; + ast_odbc_sanity_check(obj); + goto retry; + } + ast_log(LOG_WARNING, "SQL Alloc Handle failed on connection '%s'!\n", database); + break; + } + + res = SQLColumns(stmt, NULL, 0, NULL, 0, (unsigned char *)tablename, SQL_NTS, (unsigned char *)"%", SQL_NTS); + if ((res != SQL_SUCCESS) && (res != SQL_SUCCESS_WITH_INFO)) { + if (try == 0) { + try = 1; + SQLFreeHandle(SQL_HANDLE_STMT, stmt); + ast_odbc_sanity_check(obj); + goto retry; + } + ast_log(LOG_ERROR, "Unable to query database columns on connection '%s'.\n", database); + break; + } + + if (!(tableptr = ast_calloc(sizeof(char), sizeof(*tableptr) + strlen(database) + 1 + strlen(tablename) + 1))) { + ast_log(LOG_ERROR, "Out of memory creating entry for table '%s' on connection '%s'\n", tablename, database); + break; + } + + tableptr->connection = (char *)tableptr + sizeof(*tableptr); + tableptr->table = (char *)tableptr + sizeof(*tableptr) + strlen(database) + 1; + strcpy(tableptr->connection, database); /* SAFE */ + strcpy(tableptr->table, tablename); /* SAFE */ + AST_RWLIST_HEAD_INIT(&(tableptr->columns)); + + while ((res = SQLFetch(stmt)) != SQL_NO_DATA && res != SQL_ERROR) { + SQLGetData(stmt, 4, SQL_C_CHAR, columnname, sizeof(columnname), &sqlptr); + + if (!(entry = ast_calloc(sizeof(char), sizeof(*entry) + strlen(columnname) + 1))) { + ast_log(LOG_ERROR, "Out of memory creating entry for column '%s' in table '%s' on connection '%s'\n", columnname, tablename, database); + error = 1; + break; + } + entry->name = (char *)entry + sizeof(*entry); + strcpy(entry->name, columnname); + + SQLGetData(stmt, 5, SQL_C_SHORT, &entry->type, sizeof(entry->type), NULL); + SQLGetData(stmt, 7, SQL_C_LONG, &entry->size, sizeof(entry->size), NULL); + SQLGetData(stmt, 9, SQL_C_SHORT, &entry->decimals, sizeof(entry->decimals), NULL); + SQLGetData(stmt, 10, SQL_C_SHORT, &entry->radix, sizeof(entry->radix), NULL); + SQLGetData(stmt, 11, SQL_C_SHORT, &entry->nullable, sizeof(entry->nullable), NULL); + SQLGetData(stmt, 16, SQL_C_LONG, &entry->octetlen, sizeof(entry->octetlen), NULL); + + /* Specification states that the octenlen should be the maximum number of bytes + * returned in a char or binary column, but it seems that some drivers just set + * it to NULL. (Bad Postgres! No biscuit!) */ + if (entry->octetlen == 0) { + entry->octetlen = entry->size; + } + + ast_verb(10, "Found %s column with type %hd with len %ld, octetlen %ld, and numlen (%hd,%hd)\n", entry->name, entry->type, (long) entry->size, (long) entry->octetlen, entry->decimals, entry->radix); + /* Insert column info into column list */ + AST_LIST_INSERT_TAIL(&(tableptr->columns), entry, list); + } + SQLFreeHandle(SQL_HANDLE_STMT, stmt); + + AST_RWLIST_INSERT_TAIL(&odbc_tables, tableptr, list); + AST_RWLIST_RDLOCK(&(tableptr->columns)); + } while (0); + + AST_RWLIST_UNLOCK(&odbc_tables); + + if (error) { + destroy_table_cache(tableptr); + tableptr = NULL; + } + if (obj) { + ast_odbc_release_obj(obj); + } + return tableptr; +} + +struct odbc_cache_columns *ast_odbc_find_column(struct odbc_cache_tables *table, const char *colname) +{ + struct odbc_cache_columns *col; + AST_RWLIST_TRAVERSE(&table->columns, col, list) { + if (strcasecmp(col->name, colname) == 0) { + return col; + } + } + return NULL; +} + +int ast_odbc_clear_cache(const char *database, const char *tablename) +{ + struct odbc_cache_tables *tableptr; + + AST_RWLIST_WRLOCK(&odbc_tables); + AST_RWLIST_TRAVERSE_SAFE_BEGIN(&odbc_tables, tableptr, list) { + if (strcmp(tableptr->connection, database) == 0 && strcmp(tableptr->table, tablename) == 0) { + AST_LIST_REMOVE_CURRENT(list); + destroy_table_cache(tableptr); + break; + } + } + AST_RWLIST_TRAVERSE_SAFE_END + AST_RWLIST_UNLOCK(&odbc_tables); + return tableptr ? 0 : -1; +} + SQLHSTMT ast_odbc_direct_execute(struct odbc_obj *obj, SQLHSTMT (*exec_cb)(struct odbc_obj *obj, void *data), void *data) { int attempt; @@ -636,6 +797,7 @@ static odbc_status odbc_obj_connect(struct odbc_obj *obj) static int reload(void) { + struct odbc_cache_tables *table; struct odbc_class *class; struct odbc_obj *current; struct ao2_iterator aoi = ao2_iterator_init(class_container, 0); @@ -694,6 +856,13 @@ static int reload(void) ao2_ref(class, -1); /* C-ref-- (by iterator) */ } + /* Empty the cache; it will get rebuilt the next time the tables are needed. */ + AST_RWLIST_WRLOCK(&odbc_tables); + while ((table = AST_RWLIST_REMOVE_HEAD(&odbc_tables, list))) { + destroy_table_cache(table); + } + AST_RWLIST_UNLOCK(&odbc_tables); + return 0; } |