int Recovery::recover(StoreServer &server) {
std::vector<std::string> cmds;
std::string filename = CMD_SAVE_PATH_FOLDER;
int err = 0;
for (std::size_t i = 0; i < server.db().size(); ++i) {
filename = CMD_SAVE_PATH_FOLDER;
filename = filename + "/db" + utils::to_string(i) + ".kvdb";
cmds.clear();
err = read_file(filename, cmds);
if (err < 0) {
LOG_DEBUG<<"read_file error,filename:" << filename;
continue;
}
//执行命令
err = execute_cmds(server, i, cmds);
if (err < 0) {
//命令有一条执行失败，就清空那一整个数据库
LOG_DEBUG<<"cmd syntax error";
server.db().clear(i);
continue;
}
}
return 0;
}
int evaluate(struct SLList *tokens) {
struct SLList cmds;
init_list(&cmds);
IOModifier prev_mod = NO_MODIFIER;
struct ExecutableCmd *exe = (struct ExecutableCmd *)malloc(sizeof(struct ExecutableCmd));
init_executable_cmd(exe);
while (tokens->length != 0) {
struct Token *tok = pop_front(tokens);
// check for output redirection conflicts here.
if ( prev_mod == PIPE ) {
if (exe->output_redir_to) { // conflict
// dump the token and cmd lists.
destroy_token(tok);
while ( (tok = pop_front(tokens)) ) destroy_token(tok);
destroy_exe_cmd(exe);
destroy_cmd_list(&cmds);
fprintf(stderr, "error: syntax error in output redirection.\n");
return -1;
}
add_back(&cmds, exe);
exe = (struct ExecutableCmd *)malloc(sizeof(struct ExecutableCmd));
init_executable_cmd(exe);
prev_mod = NO_MODIFIER;
}
// use previous token's mod, if mod exists,
// and this token's info to populate redirection of exe.
if (prev_mod == INPUT_REDIR) {
exe->input_redir_from = make_file_path(tok->name);
} else if (prev_mod == OUTPUT_REDIR) {
exe->output_redir_to = make_file_path(tok->name);
} else if (prev_mod == ERR_OUTPUT_REDIR) {
exe->err_output_redir_to = make_file_path(tok->name);
}
if ( prev_mod == NO_MODIFIER ) {
if ( (exe->full_path = find_cmd(tok->name)) != NULL ) {
exe->args = populate_args(tok);
if (tok->mod == NO_MODIFIER) {
add_back(&cmds, exe);
}
} else {
fprintf(stderr, "error: not a valid command.\n");
destroy_token(tok);
destroy_exe_cmd(exe);
destroy_cmd_list(&cmds);
return -1;
}
} else if (tok->mod == NO_MODIFIER) {
add_back(&cmds, exe);
}
prev_mod = tok->mod;
destroy_token(tok);
}
// Execute the commands.
int exe_status = execute_cmds(&cmds);
// TODO: destroy the cmds list.
destroy_cmd_list(&cmds);
// return 0 if everything went peachy.
return exe_status;
}