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Keeper.cpp
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164 lines (135 loc) · 3.87 KB
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#include "Keeper.h"
#include <fstream>
#include <string>
#include <iostream>
#include <random>
char *getIP();
std::string trim(const std::string &s) {
std::string res = s;
if (!res.empty()) {
res.erase(0, res.find_first_not_of(" "));
res.erase(res.find_last_not_of(" ") + 1);
}
return res;
}
const char *Keeper::SERVER_NUM_KEY = "serverNum";
Keeper::Keeper(uint32_t maxServer)
: maxServer(maxServer), curServer(0), memc(NULL) {}
Keeper::~Keeper() {
// listener.detach();
disconnectMemcached();
}
bool Keeper::connectMemcached() {
memcached_server_st *servers = NULL;
memcached_return rc;
std::ifstream conf("../memcached.conf");
if (!conf) {
fprintf(stderr, "can't open memcached.conf\n");
return false;
}
std::string addr, port;
std::getline(conf, addr);
std::getline(conf, port);
memc = memcached_create(NULL);
servers = memcached_server_list_append(servers, trim(addr).c_str(),
std::stoi(trim(port)), &rc);
rc = memcached_server_push(memc, servers);
if (rc != MEMCACHED_SUCCESS) {
fprintf(stderr, "Counld't add server:%s\n", memcached_strerror(memc, rc));
sleep(1);
return false;
}
memcached_behavior_set(memc, MEMCACHED_BEHAVIOR_BINARY_PROTOCOL, 1);
return true;
}
bool Keeper::disconnectMemcached() {
if (memc) {
memcached_quit(memc);
memcached_free(memc);
memc = NULL;
}
return true;
}
void Keeper::serverEnter() {
memcached_return rc;
uint64_t serverNum;
while (true) {
rc = memcached_increment(memc, SERVER_NUM_KEY, strlen(SERVER_NUM_KEY), 1,
&serverNum);
if (rc == MEMCACHED_SUCCESS) {
std::string ip(getIP());
#ifdef STATIC_ID_FROM_IP
myNodeID = std::atoi(ip.substr(ip.find_last_of('.') + 1).c_str()) - 1;
#else
myNodeID = serverNum - 1;
#endif
Debug::notifyInfo("Compute server %d start up [%s]\n", myNodeID, ip.c_str());
return;
}
fprintf(stderr, "Server %d Counld't incr value and get ID: %s, retry...\n",
myNodeID, memcached_strerror(memc, rc));
usleep(10000);
}
}
void Keeper::serverConnect() {
size_t l;
uint32_t flags;
memcached_return rc;
while (curServer < maxServer) {
char *serverNumStr = memcached_get(memc, SERVER_NUM_KEY,
strlen(SERVER_NUM_KEY), &l, &flags, &rc);
if (rc != MEMCACHED_SUCCESS) {
fprintf(stderr, "Server %d Counld't get serverNum: %s, retry\n", myNodeID,
memcached_strerror(memc, rc));
continue;
}
uint32_t serverNum = atoi(serverNumStr);
free(serverNumStr);
// /connect server K
for (size_t k = curServer; k < serverNum; ++k) {
if (k != myNodeID) {
connectNode(k);
printf("I connect server %zu\n", k);
}
}
curServer = serverNum;
}
}
void Keeper::memSet(const char *key, uint32_t klen, const char *val,
uint32_t vlen) {
memcached_return rc;
while (true) {
rc = memcached_set(memc, key, klen, val, vlen, (time_t)0, (uint32_t)0);
if (rc == MEMCACHED_SUCCESS) {
break;
}
usleep(400);
}
}
char *Keeper::memGet(const char *key, uint32_t klen, size_t *v_size) {
size_t l;
char *res;
uint32_t flags;
memcached_return rc;
while (true) {
res = memcached_get(memc, key, klen, &l, &flags, &rc);
if (rc == MEMCACHED_SUCCESS) {
break;
}
usleep(40 * myNodeID);
}
if (v_size != nullptr) {
*v_size = l;
}
return res;
}
uint64_t Keeper::memFetchAndAdd(const char *key, uint32_t klen) {
uint64_t res;
while (true) {
memcached_return rc = memcached_increment(memc, key, klen, 1, &res);
if (rc == MEMCACHED_SUCCESS) {
return res;
}
usleep(400 * myNodeID);
}
}