Modules hooks: unify structures definitions.

src/module.c

@@ -1534,21 +1534,10 @@ unsigned long long RM_GetClientId(RedisModuleCtx *ctx) {
  * then REDISMODULE_ERR is returned. Otherwise the function returns
  * REDISMODULE_OK and the structure pointed by 'ci' gets populated. */
 
-/* Note that we may have multiple versions of the client info structure,
- * as the API evolves. */
-struct moduleClientInfoV1 {
-    uint64_t version;       /* Version of this structure for ABI compat. */
-    uint64_t flags;         /* REDISMODULE_CLIENTINFO_FLAG_* */
-    uint64_t id;            /* Client ID. */
-    char addr[46];          /* IPv4 or IPv6 address. */
-    uint16_t port;          /* TCP port. */
-    uint16_t db;            /* Selected DB. */
-};
-
 int modulePopulateClientInfoStructure(void *ci, client *client, int structver) {
     if (structver != 1) return REDISMODULE_ERR;
 
-    struct moduleClientInfoV1 *ci1 = ci;
+    RedisModuleClientInfoV1 *ci1 = ci;
     memset(ci1,0,sizeof(*ci1));
     ci1->version = structver;
     if (client->flags & CLIENT_MULTI)
@@ -5738,12 +5727,12 @@ void ModuleForkDoneHandler(int exitcode, int bysignal) {
  *          The data pointer can be casted to a RedisModuleFlushInfo
  *          structure with the following fields:
  *
- *              int async;      // True if the flush is done in a thread.
+ *              int32_t async;  // True if the flush is done in a thread.
  *                                 See for instance FLUSHALL ASYNC.
  *                                 In this case the END callback is invoked
  *                                 immediately after the database is put
  *                                 in the free list of the thread.
- *              int dbnum;      // Flushed database number, -1 for all the DBs
+ *              int32_t dbnum;  // Flushed database number, -1 for all the DBs
  *                                 in the case of the FLUSHALL operation.
  *
  *          The start event is called *before* the operation is initated, thus
@@ -5876,7 +5865,7 @@ void moduleFireServerEvent(uint64_t eid, int subid, void *data) {
             ctx.client = moduleFreeContextReusedClient;
 
             void *moduledata = NULL;
-            struct moduleClientInfoV1 civ1;
+            RedisModuleClientInfoV1 civ1;
             if (eid == REDISMODULE_EVENT_CLIENT_CHANGE) {
                 modulePopulateClientInfoStructure(&civ1,data,
                                                   el->event.dataver);

src/redismodule.h

@@ -247,6 +247,44 @@ static RedisModuleEvent
 #define REDISMODULE_CLIENTINFO_FLAG_UNIXSOCKET (1<<4)
 #define REDISMODULE_CLIENTINFO_FLAG_MULTI (1<<5)
 
+/* Here we take all the structures that the module pass to the core
+ * and the other way around. Notably the list here contains the structures
+ * used by the hooks API RedisModule_RegisterToServerEvent().
+ *
+ * The structures always start with a 'version' field. This is useful
+ * when we want to pass a reference to the structure to the core APIs,
+ * for the APIs to fill the structure. In that case, the structure 'version'
+ * field is initialized before passing it to the core, so that the core is
+ * able to cast the pointer to the appropriate structure version. In this
+ * way we obtain ABI compatibility.
+ *
+ * Here we'll list all the structure versions in case they evolve over time,
+ * however using a define, we'll make sure to use the last version as the
+ * public name for the module to use. */
+
+#define REDISMODULE_CLIENTINFO_VERSION 1
+typedef struct RedisModuleClientInfo {
+    uint64_t version;       /* Version of this structure for ABI compat. */
+    uint64_t flags;         /* REDISMODULE_CLIENTINFO_FLAG_* */
+    uint64_t id;            /* Client ID. */
+    char addr[46];          /* IPv4 or IPv6 address. */
+    uint16_t port;          /* TCP port. */
+    uint16_t db;            /* Selected DB. */
+} RedisModuleClientInfoV1;
+
+#define RedisModuleClientInfo RedisModuleClientInfoV1
+
+#define REDISMODULE_FLUSHINFO_VERSION 1
+typedef struct RedisModuleFlushInfo {
+    uint64_t version;       /* Not used since this structure is never passed
+                               from the module to the core right now. Here
+                               for future compatibility. */
+    int32_t sync;           /* Synchronous or threaded flush?. */
+    int32_t dbnum;          /* Flushed database number, -1 for ALL. */
+} RedisModuleFlushInfoV1;
+
+#define RedisModuleFlushInfo RedisModuleFlushInfoV1
+
 /* ------------------------- End of common defines ------------------------ */
 
 #ifndef REDISMODULE_CORE
@@ -300,16 +338,6 @@ typedef struct RedisModuleTypeMethods {
     int aux_save_triggers;
 } RedisModuleTypeMethods;
 
-#define REDISMODULE_CLIENTINFO_VERSION 1
-typedef struct RedisModuleClientInfo {
-    uint64_t version;       /* Version of this structure for ABI compat. */
-    uint64_t flags;         /* REDISMODULE_CLIENTINFO_FLAG_* */
-    uint64_t id;            /* Client ID. */
-    char addr[46];          /* IPv4 or IPv6 address. */
-    uint16_t port;          /* TCP port. */
-    uint16_t db;            /* Selected DB. */
-} RedisModuleClientInfo;
-
 #define REDISMODULE_GET_API(name) \
     RedisModule_GetApi("RedisModule_" #name, ((void **)&RedisModule_ ## name))