实现全量持久化：save操作落盘，启动时读取到内存

增量持久化：执行修改操作时将cmd追加到log中，启动时逐条取出顺序执行

kvstore.c

@@ -4,6 +4,10 @@
 
 #include "kvstore.h"
 #include "kvs_rw_tools.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
 
 #if ENABLE_ARRAY
 extern kvs_array_t global_array;
@@ -17,6 +21,8 @@ extern kvs_rbtree_t global_rbtree;
 extern kvs_hash_t global_hash;
 #endif
 
+int global_cmd_log_fd = -1;
+
 void *kvs_malloc(size_t size) {
 	return malloc(size);
 }
@@ -60,10 +66,7 @@ int kvs_split_token(char *msg, char *tokens[]) {
 // tokens[1] : Key
 // tokens[2] : Value
 
-#if BIN_SAFE
-
-
-#else 
+#if !BIN_SAFE
 int kvs_filter_protocol(char **tokens, int count, char *response) {
 
 	if (tokens[0] == NULL || count == 0 || response == NULL) return -1;
@@ -282,6 +285,12 @@ int kvs_protocol(char *request, int request_length, int *consumed_out, char *res
 			*consumed_out = consumed;
             *response_length = out_len;
 			return KVS_ERROR;
+		}else{
+// 执行成功，在这里保存到日志中。
+			if(req.op == KVS_CMD_SET || req.op == KVS_CMD_MOD || req.op == KVS_CMD_DEL){
+				printf("%d:%d\n", req.op, req.argc);
+				kvs_save_cmd_to_logfile(p, len, global_cmd_log_fd);
+			}
 		}
 
 		if (out_len >= KVS_MAX_RESPONSE) {
@@ -338,11 +347,28 @@ int kvs_protocol(char *msg, int length, char *response) {  //
 }
 #endif
 
+
+int init_cmd_log(const char *file, int *logfd){
+	if(!file) return -1;
+	int fd = open(file, O_RDWR | O_CREAT | O_APPEND, 0644);
+	if(fd < 0) return -2;
+
+	*logfd = fd;
+	return 0;
+}
+
+int destroy_cmd_log(int logfd){
+	close(logfd);
+	return 0;
+}
+
 int init_kvengine(void) {
 
 #if ENABLE_ARRAY
 	memset(&global_array, 0, sizeof(kvs_array_t));
 	kvs_array_create(&global_array);
+
+	kvs_array_load(&global_array, KVS_ARRAY_FILE);
 #endif
 
 #if ENABLE_RBTREE
@@ -355,6 +381,9 @@ int init_kvengine(void) {
 	kvs_hash_create(&global_hash);
 #endif
 
+	init_cmd_log(KVS_CMD_LOG_FILE, &global_cmd_log_fd);
+	kvs_replay_log(KVS_CMD_LOG_FILE, global_cmd_log_fd);
+
 	return 0;
 }
 
@@ -369,6 +398,7 @@ void dest_kvengine(void) {
 	kvs_hash_destroy(&global_hash);
 #endif
 
+	destroy_cmd_log(global_cmd_log_fd);
 }