连接已经可以，等待实现同步数据

src/async.c

@@ -209,13 +209,6 @@ redisAsyncContext *redisAsyncConnectBind(const char *ip, int port,
     return redisAsyncConnectWithOptions(&options);
 }
 
-redisAsyncContext *redisAsyncConnectBindWithTimeout(const char *ip, int port, const char *source_addr) {
-    redisOptions options = {0};
-    REDIS_OPTIONS_SET_TCP(&options, ip, port);
-    options.endpoint.tcp.source_addr = source_addr;
-    return redisAsyncConnectWithOptions(&options);
-}
-
 redisAsyncContext *redisAsyncConnectBindWithReuse(const char *ip, int port,
                                                   const char *source_addr) {
     redisOptions options = {0};

src/async.h

@@ -115,7 +115,6 @@ typedef struct redisAsyncContext {
 redisAsyncContext *redisAsyncConnectWithOptions(const redisOptions *options);
 redisAsyncContext *redisAsyncConnect(const char *ip, int port);
 redisAsyncContext *redisAsyncConnectBind(const char *ip, int port, const char *source_addr);
-redisAsyncContext *redisAsyncConnectBindWithTimeout(const char *ip, int port, const char *source_addr);
 redisAsyncContext *redisAsyncConnectBindWithReuse(const char *ip, int port,
                                                   const char *source_addr);
 redisAsyncContext *redisAsyncConnectUnix(const char *path);

src/redis-migrate.c

@@ -2,19 +2,83 @@
 #include <sys/time.h>
 #include <unistd.h>
 #include <string.h>
-#include <signal.h>
 #include <pthread.h>
 #include "redis-migrate.h"
 #include "hiredis.h"
-#include "async.h"
 
-static redisContext *context;
+static migrateObj *mobj;
+
+migrateObj *createMigrateObject(robj *host, int port, int begin_slot, int end_slot) {
+    migrateObj *m;
+    m = hi_malloc(sizeof(*m));
+    m->host = host->ptr;
+    m->port = port;
+    m->begin_slot = begin_slot;
+    m->end_slot = end_slot;
+    m->repl_stat = REPL_STATE_NONE;
+    return m;
+}
+
+void freeMigrateObj(migrateObj *m) {
+    redisFree(m->source_cc);
+    hi_free(m);
+    mobj = NULL;
+}
+
+int sendReplCommand(RedisModuleCtx *ctx, char *format, ...) {
+    va_list ap;
+    va_start(ap, format);
+    redisReply *reply = redisvCommand(mobj->source_cc, format, ap);
+    va_end(ap);
+    if (reply == NULL || reply->type == REDIS_REPLY_ERROR) {
+        RedisModule_Log(ctx, REDISMODULE_LOGLEVEL_WARNING, "send %s failed ip:%s,port:%d, error:%s",
+                        format, mobj->host, mobj->port, reply->str);
+        freeReplyObject(reply);
+        return 0;
+    }
+    RedisModule_Log(ctx, REDISMODULE_LOGLEVEL_NOTICE, "%s %s", format, reply->str);
+    freeReplyObject(reply);
+    return 1;
+}
 
 void *syncWithRedis(void *arg) {
     RedisModuleCtx *ctx = arg;
     RedisModule_Log(ctx, REDISMODULE_LOGLEVEL_NOTICE, "begin sync data");
+    if (!sendReplCommand(ctx, "PING")) {
+        goto error;
+    }
+    //todo auth with master
+    sds portstr = sdsfromlonglong(mobj->port);
+    if (!sendReplCommand(ctx, "REPLCONF listening-port %s", portstr)) {
+        sdsfree(portstr);
+        goto error;
+    }
+    sdsfree(portstr);
+    if (!sendReplCommand(ctx, "REPLCONF ip-address %s", mobj->host)) {
+        goto error;
+    }
+    if (!sendReplCommand(ctx, "REPLCONF %s %s %s %s", "capa", "eof", "capa", "psync2")) {
+        goto error;
+    }
+
+    return NULL;
+    error:
+    freeMigrateObj(mobj);
     return NULL;
 }
+
+int connectRedis(RedisModuleCtx *ctx) {
+    pthread_t pthread;
+    int flag = pthread_create(&pthread, NULL, syncWithRedis, ctx);
+    if (flag != 0) {
+        RedisModule_Log(ctx, REDISMODULE_LOGLEVEL_WARNING, "Can't start thread");
+        freeMigrateObj(mobj);
+        return RedisModule_ReplyWithError(ctx, "Can't start thread");
+    }
+    pthread_join(pthread, NULL);
+    return RedisModule_ReplyWithSimpleString(ctx, "OK");
+}
+
 /**
  * migrate data to current instance.
  * migrate host port begin-slot end-slot
@@ -28,36 +92,28 @@ int rm_migrateCommand(RedisModuleCtx *ctx, RedisModuleString **argv, int argc) {
         return RedisModule_WrongArity(ctx);
     }
     robj *host = (robj *) argv[1];
-    robj *p = (robj *) argv[2];
+    robj *port = (robj *) argv[2];
     robj *begin_slot = (robj *) argv[3];
     robj *end_slot = (robj *) argv[4];
     RedisModule_Log(ctx, REDISMODULE_LOGLEVEL_NOTICE, "host:%s, port:%s, begin:%s, end:%s", (char *) host->ptr,
-                    (char *) p->ptr, (char *) begin_slot->ptr, (char *) end_slot->ptr);
-    if (context != NULL) {
+                    (char *) port->ptr, (char *) begin_slot->ptr, (char *) end_slot->ptr);
+    if (mobj != NULL) {
         return RedisModule_ReplyWithError(ctx, "-ERR is migrating, please waiting");
     }
-    int port = atoi(p->ptr);
-    struct timeval timeout = {0, 500000}; // 0.5s
-    context = redisConnectWithTimeout(host->ptr, port, timeout);
-    if (context == NULL || context->err) {
-        RedisModule_Log(ctx, REDISMODULE_LOGLEVEL_WARNING, "Could not connect to Redis at ip:%s,port:%s",
-                        (char *) host->ptr,
-                        (char *) p->ptr);
-        redisFree((redisContext *) context);
-        context = NULL;
+    mobj = createMigrateObject(host, atoi(port->ptr), atoi(begin_slot->ptr), atoi(end_slot->ptr));
+    struct timeval timeout = {1, 500000}; // 1.5s
+    redisOptions options = {0};
+    REDIS_OPTIONS_SET_TCP(&options, (const char *) mobj->host, mobj->port);
+    options.connect_timeout = &timeout;
+    mobj->source_cc = redisConnectWithOptions(&options);
+    if (mobj->source_cc == NULL || mobj->source_cc->err) {
+        RedisModule_Log(ctx, REDISMODULE_LOGLEVEL_WARNING, "Could not connect to Redis at ip:%s,port:%d, error:%s",
+                        mobj->host, mobj->port, mobj->source_cc->errstr);
+        freeMigrateObj(mobj);
         return RedisModule_ReplyWithError(ctx, "Can't connect source redis");
     }
+    return connectRedis(ctx);
 
-    pthread_t pthread;
-    int flag = pthread_create(&pthread, NULL, syncWithRedis, ctx);
-    if (flag == 0) {
-        RedisModule_Log(ctx, REDISMODULE_LOGLEVEL_WARNING, "Can't start thread");
-        redisFree((redisContext *) context);
-        context = NULL;
-        return RedisModule_ReplyWithError(ctx, "Can't start thread");
-    }
-    pthread_join(pthread, NULL);
-    return RedisModule_ReplyWithSimpleString(ctx, "OK");
 }
 
 /* This function must be present on each Redis module. It is used in order to
@@ -71,11 +127,13 @@ int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc)
     if (flag == REDISMODULE_ERR) {
         return REDISMODULE_ERR;
     }
-    RedisModule_Log(ctx, REDISMODULE_LOGLEVEL_NOTICE, "init %s success", MODULE_NAME);
+    RedisModule_SetClusterFlags(ctx, REDISMODULE_CLUSTER_FLAG_NO_REDIRECTION);
+    RedisModule_Log(ctx, REDISMODULE_LOGLEVEL_NOTICE, "begin init commands of %s", MODULE_NAME);
     flag = RedisModule_CreateCommand(ctx, "rm.migrate", rm_migrateCommand, "write deny-oom admin", 1, 1, 0);
     if (flag == REDISMODULE_ERR) {
         RedisModule_Log(ctx, REDISMODULE_LOGLEVEL_WARNING, "init rm.migrate failed");
         return REDISMODULE_ERR;
     }
+    RedisModule_Log(ctx, REDISMODULE_LOGLEVEL_NOTICE, "init %s success", MODULE_NAME);
     return REDISMODULE_OK;
 }

src/redis-migrate.h

@@ -3,6 +3,9 @@
 #define REDIS_MIGRATE_REDIS_MIGRATE_H
 
 #include "redismodule.h"
+#include "ae.h"
+#include "sds.h"
+#include "sdscompat.h"
 
 #define MODULE_NAME "redis-migrate"
 #define REDIS_MIGRATE_VERSION 1
@@ -10,6 +13,9 @@
 #define C_ERR -1
 #define C_OK 1
 
+/* Anti-warning macro... */
+#define UNUSED(V) ((void) V)
+
 typedef struct redisObject {
     unsigned type: 4;
     unsigned encoding: 4;
@@ -20,6 +26,17 @@ typedef struct redisObject {
     void *ptr;
 } robj;
 
+typedef struct migrateObject {
+    char *address;
+    int repl_stat;
+    redisContext *source_cc;
+    char *host;
+    int port;
+    int begin_slot;
+    int end_slot;
+    char psync_offset[32];
+} migrateObj;
+
 typedef enum {
     REPL_STATE_NONE = 0,            /* No active replication */
     REPL_STATE_CONNECT,             /* Must connect to master */
@@ -36,10 +53,22 @@ typedef enum {
     /* --- End of handshake states --- */
     REPL_STATE_TRANSFER,        /* Receiving .rdb from master */
     REPL_STATE_CONNECTED,       /* Connected to master */
+    STATE_CONNECT_ERROR,
+    STATE_DISCONNECT
 } repl_state;
 
 long long ustime(void);
 
+migrateObj *createMigrateObject(robj *host, int port, int begin_slot, int end_slot);
+
+void freeMigrateObj(migrateObj *m);
+
+int sendReplCommand(RedisModuleCtx *ctx, char *format, ...);
+
+void *syncWithRedis(void *arg);
+
+int connectRedis(RedisModuleCtx *ctx) ;
+
 int rm_migrateCommand(RedisModuleCtx *ctx, RedisModuleString **argv, int argc);
 
 int RedisModule_OnLoad(RedisModuleCtx *ctx, RedisModuleString **argv, int argc);