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Copy pathslave.cpp
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executable file
·249 lines (225 loc) · 5.65 KB
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#include <pthread.h>
#include <vector>
#include "slave.h"
Slave::Slave(const SSDB *ssdb, leveldb::DB* meta_db, const char *ip, int port){
this->ssdb = ssdb;
this->meta_db = meta_db;
this->master_ip = std::string(ip);
this->master_port = port;
this->last_seq = 0;
this->last_key = "";
load_status();
log_debug("last_seq: %llu, last_key: %s",
last_seq, hexmem(last_key.data(), last_key.size()).c_str());
}
Slave::~Slave(){
log_debug("stopping slave thread...");
stop();
log_debug("Slave finalized");
}
void Slave::stop(){
thread_quit = true;
void *tret;
int err = pthread_join(run_thread_tid, &tret);
if(err != 0){
log_error("can't join thread: %s", strerror(err));
}
}
std::string Slave::status_key(){
std::string key = "slave.status|";
key.append(master_ip);
key.append("|");
char buf[10];
sprintf(buf, "%d", master_port);
key.append(buf);
return key;
}
void Slave::load_status(){
std::string key = status_key();
std::string status;
leveldb::Status s;
s = meta_db->Get(leveldb::ReadOptions(), key, &status);
if(s.IsNotFound()){
return;
}
if(s.ok()){
if(status.size() < sizeof(uint64_t)){
log_error("invlid format of status");
}else{
last_seq = *((uint64_t *)(status.data()));
last_key = std::string(status.data() + sizeof(uint64_t), status.size() - sizeof(uint64_t));
log_debug("load_status seq: %llu, key: %s",
last_seq,
hexmem(last_key.data(), last_key.size()).c_str());
}
}
}
void Slave::save_status(){
std::string key = status_key();
std::string status;
status.append((char *)&this->last_seq, sizeof(uint64_t));
status.append(this->last_key);
meta_db->Put(leveldb::WriteOptions(), key, status);
}
void Slave::start(){
thread_quit = false;
int err = pthread_create(&run_thread_tid, NULL, &Slave::_run_thread, this);
if(err != 0){
log_error("can't create thread: %s", strerror(err));
}
}
template<class T>
static std::string serialize_req(T &req){
std::string ret;
char buf[50];
for(int i=0; i<req.size(); i++){
if(i >= 5 && i < req.size() - 1){
sprintf(buf, "[%d more...]", (int)req.size() - i - 1);
ret.append(buf);
break;
}
if(((req[0] == "get" || req[0] == "set") && i == 1) || req[i].size() < 30){
std::string h = hexmem(req[i].data(), req[i].size());
ret.append(h);
}else{
sprintf(buf, "[%d bytes]", (int)req[i].size());
ret.append(buf);
}
if(i < req.size() - 1){
ret.append(" ");
}
}
return ret;
}
static Link* connect(const char *ip, int port, uint64_t last_seq, std::string &last_key){
Link *link = Link::connect(ip, port);
if(link == NULL){
log_error("failed to connect to master: %s:%d!", ip, port);
goto err;
}
// TODO: set link.recv_timeout
char seq_buf[20];
sprintf(seq_buf, "%llu", last_seq);
link->output->append_record("sync");
link->output->append_record(seq_buf);
link->output->append_record(last_key);
link->output->append('\n');
if(link->flush() == -1){
log_error("network error");
goto err;
}
log_info("ready to receive sync commands...");
return link;
err:
return NULL;
}
void* Slave::_run_thread(void *arg){
Slave *slave = (Slave *)arg;
const SSDB *ssdb = slave->ssdb;
const char *ip = slave->master_ip.c_str();
int port = slave->master_port;
Link *link = NULL;
int retry = 0;
const std::vector<Bytes> *req;
while(!slave->thread_quit){
if(link == NULL){
usleep(100 * 1000);
if(retry > 100){
retry = 61;
}
// TODO: 找一个公式
if(retry == 0 || retry == 10 || retry == 30 || retry == 60 || retry == 100){
log_info("[%d] connecting to master at %s:%d...", retry, ip, port);
link = connect(ip, port, slave->last_seq, slave->last_key);
}
if(link == NULL){
retry ++;
continue;
}else{
retry = 0;
}
}
req = link->recv();
if(req == NULL){
retry = 1;
delete link;
link = NULL;
log_info("recv error, reconnecting to master...");
continue;
}else if(req->empty()){
if(link->read() <= 0){
retry = 1;
delete link;
link = NULL;
log_info("network error, reconnecting to master...");
}
continue;
}
Bytes cmd = req->at(0);
if(cmd == "dump_begin"){
log_info("dump begin");
// TODO: patch-diff old data
}else if(cmd == "dump_end"){
log_info("dump end, step in sync");
slave->last_key = "";
slave->save_status();
}else if(cmd == "dump_set"){
log_debug("%s", serialize_req(*req).c_str());
if(req->size() != 4){
log_warn("invalid dump_set params!");
break;
}
uint64_t seq = req->at(1).Uint64();
Bytes key = req->at(2);
Bytes val = req->at(3);
slave->last_key = key.String();
if(seq > 0){
slave->last_seq = seq;
}
int ret = ssdb->raw_set(key, val);
if(ret == -1){
log_error("ssdb.raw_set error!");
}
slave->save_status();
}else if(cmd == "sync_set"){
log_debug("%s", serialize_req(*req).c_str());
if(req->size() != 4){
log_warn("invalid sync_set params!");
break;
}
uint64_t seq = req->at(1).Uint64();
Bytes key = req->at(2);
Bytes val = req->at(3);
// sync
slave->last_seq = seq;
int ret = ssdb->raw_set(key, val);
if(ret == -1){
log_error("ssdb.raw_set error!");
}
slave->save_status();
}else if(cmd == "sync_del"){
log_debug("%s", serialize_req(*req).c_str());
if(req->size() != 3){
log_warn("invalid del params!");
break;
}
uint64_t seq = req->at(1).Uint64();
Bytes key = req->at(2);
slave->last_seq = seq;
int ret = ssdb->raw_del(key);
if(ret == -1){
log_error("ssdb.raw_del error!");
}
slave->save_status();
}else if(cmd == "noop"){
//
}else{
log_warn("unknow sync command: %s", serialize_req(*req).c_str());
}
} // end while
if(link){
delete link;
}
log_info("Slave thread quit");
return (void *)NULL;
}