forked from mengning/nezha
/
configdb.c
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/
configdb.c
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/********************************************************************/
/* Copyright (C) MC2Lab-USTC, 2012-2013 */
/* */
/* FILE NAME : configdb.c */
/* PRINCIPAL AUTHOR : Mengning */
/* SUBSYSTEM NAME : DB */
/* MODULE NAME : dbapi */
/* LANGUAGE : C */
/* TARGET ENVIRONMENT : linux */
/* DATE OF FIRST RELEASE : 2012/1/14 */
/* DESCRIPTION : Abstract Interface of ConfigDB API */
/********************************************************************/
/*
* Revision log:
*
* Created by Mengning,2012/1/14
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <pthread.h>
#include "configdb.h"
#include "nodes.h"
#include "engine.h"
#include "dbapi.h"
#include "common.h"
int gethash(const char *kbuf, int ksiz);
/**********************************************/
/* Database Operations
/**********************************************/
/*
* Initialize ConfigDB
*/
tConfigDB* ConfigInitialize(int mode,char * addr,int port,char * filename)
{
debug("start ConfigInitialize...\n");
if(strlen(addr)>NAME_STR_LEN || strlen(filename)>NAME_STR_LEN)
{
fprintf(stderr,"Args Error,%s:%d\n",__FILE__,__LINE__);
return NULL;
}
tConfigDB* db = (tConfigDB*)malloc(sizeof(tConfigDB));
strncpy(db->filename,filename,NAME_STR_LEN);
strncpy(db->addr,addr,NAME_STR_LEN);
db->port = port;
if(mode & LOCAL_MODE)
{
/* open config database file */
}
else if(mode & GRID_MODE)
{
/* start as Master */
if(strcmp(addr,IP_ADDR) == 0 && PORT == port)
{
debug("GRID_MODE:Master.\n");
mode |= MASTER_MODE;
db->cluster = (void*)InitCluster();
AddNode((tCluster*)db->cluster,addr,port);
}
else /* start as Data Node */
{
debug("GRID_MODE:Data Node.\n");
db->cluster = (void*)RegisterAndLoadClusterNodes(addr,port);
}
}
else
{
goto ERROR;
}
/* create local database */
db->db = DBCreate(filename);
/* start Service Engine */
debug("start Service Engine.\n");
if(pthread_create(&(db->engine),NULL,(void*)ServiceEngine,(void*)db) != 0)
{
fprintf(stderr,"Service Engine pthread_create Error,%s:%d\n",__FILE__,__LINE__);
goto ERROR;
}
if(ConnectDataNode((tCluster*)db->cluster,addr,port,filename) != 0)
{
goto ERROR;
}
return db;
ERROR:
ConfigDestroy(db);
return NULL;
}
/*
* Destroy the ConfigDB
*/
int ConfigDestroy(tConfigDB* db)
{
DisconnectDataNode((tCluster*)db->cluster);
pthread_join(db->engine,NULL);
DBDelete(db->db);
free(db);
return SUCCESS;
}
/*
* Put key/value
*/
int ConfigPut(tConfigDB* db,const void* pKey,int KeySize,const void* pValue,int ValueSize)
{
tCluster * cluster = (tCluster*)db->cluster;
int ret = -1;
tKey key;
key.str = (char*)pKey;
key.len = KeySize;
tValue value;
value.str = (char*)pValue;
value.len = ValueSize;
unsigned int hash = gethash(key.str,key.len);
hash = hash%MAX_NODE_NUM;/* distribute strategy */
tNode* pNode = (tNode*)GetNode(cluster,hash);
/* Put Data */
if(pNode->fd == 0)
{
ret = DBSetKeyValue(db->db,key,value);
}
else if(pNode->fd == -1)
{
pNode->fd = RemoteDBCreate(db->filename,pNode->addr,pNode->port);
if(pNode->fd == -1)
{
return -1;
}
ret = RemoteDBSetKeyValue(pNode->fd,key,value);
}
else
{
ret = RemoteDBSetKeyValue(pNode->fd,key,value);
}
/* Put Master */
if(pNode != (tNode*)GetNode(cluster,MAX_NODE_NUM))
{
pNode = (tNode*)GetNode(cluster,MAX_NODE_NUM);
if(pNode->fd == 0)
{
ret = DBSetKeyValue(db->db,key,value);
}
else if(pNode->fd == -1)
{
pNode->fd = RemoteDBCreate(db->filename,pNode->addr,pNode->port);
if(pNode->fd == -1)
{
return -1;
}
ret = RemoteDBSetKeyValue(pNode->fd,key,value);
}
else
{
ret = RemoteDBSetKeyValue(pNode->fd,key,value);
}
}
return ret;
}
/*
* Get key/value
*/
int ConfigGet(tConfigDB* db,const void* pKey,int KeySize,void* pValue,int *pValueSize)
{
tCluster * cluster = (tCluster*)db->cluster;
int ret = -1;
tKey key;
key.str = (char*)pKey;
key.len = KeySize;
tValue value;
value.str = (char*)pValue;
value.len = *pValueSize;
unsigned int hash = gethash(key.str,key.len);
hash = hash%MAX_NODE_NUM;/* distribute strategy */
tNode* pNode = (tNode*)GetNode(cluster,hash);
/* hit local */
if(pNode->fd == 0)
{
ret = DBGetKeyValue(db->db,key,&value);
}
else if(pNode->fd > 0)
{
ret = RemoteDBGetKeyValue(pNode->fd,key,&value);
}
else
{
pNode->fd = RemoteDBCreate(db->filename,pNode->addr,pNode->port);
if(pNode->fd == -1)
{
return -1;
}
ret = RemoteDBGetKeyValue(pNode->fd,key,&value);
}
/* fail to get,get from master */
if(ret == -1)
{
if(pNode == (tNode*)GetNode(cluster,MAX_NODE_NUM))
{
return -1;
}
tNode* pNode = (tNode*)GetNode(cluster,MAX_NODE_NUM);
if(pNode->fd == 0)
{
ret = DBGetKeyValue(db->db,key,&value);
}
else if(pNode->fd > 0)
{
ret = RemoteDBGetKeyValue(pNode->fd,key,&value);
}
else
{
pNode->fd = RemoteDBCreate(db->filename,pNode->addr,pNode->port);
if(pNode->fd == -1)
{
return -1;
}
ret = RemoteDBGetKeyValue(pNode->fd,key,&value);
}
}
*pValueSize = value.len;
return SUCCESS;
}
/*
* delete key/value
*/
int ConfigDel(tConfigDB* db,const void* pKey,int KeySize)
{
tCluster * cluster = (tCluster*)db->cluster;
tKey key;
key.str = (char*)pKey;
key.len = KeySize;
unsigned int hash = gethash(key.str,key.len);
hash = hash%MAX_NODE_NUM;/* distribute strategy */
tNode* pNode = (tNode*)GetNode(cluster,hash);
if(pNode->fd == 0)
{
return DBDelKeyValue(db->db,key);
}
else if(pNode->fd == -1)
{
pNode->fd = RemoteDBCreate(db->filename,pNode->addr,pNode->port);
if(pNode->fd == -1)
{
return -1;
}
return RemoteDBDelKeyValue(pNode->fd,key);
}
else
{
return RemoteDBDelKeyValue(pNode->fd,key);
}
}
/**********************************************/
/* Internal Operations
/**********************************************/
/*
* hash
* copy from tokyocabinet,I don't know why so.
*/
int gethash(const char *kbuf, int ksiz)
{
#if HUAWEI_TEST
unsigned short hash = *(unsigned short*)kbuf;
#else
unsigned int idx = 19780211;
unsigned int hash = 751;
const char *rp = kbuf + ksiz;
while(ksiz--)
{
idx = idx * 37 + *(unsigned char *)kbuf++;
hash = (hash * 31) ^ *(unsigned char *)--rp;
}
#endif
return hash;
}