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extent_client.cc
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// RPC stubs for clients to talk to extent_server
#include "extent_client.h"
#include <sstream>
#include <iostream>
#include <stdio.h>
#include <unistd.h>
#include <time.h>
#include "tprintf.h"
// The calls assume that the caller holds a lock on the extent
extent_client::extent_client(std::string dst)
{
sockaddr_in dstsock;
make_sockaddr(dst.c_str(), &dstsock);
cl = new rpcc(dstsock);
if (cl->bind() != 0) {
tprintf("extent_client: bind failed\n");
}
}
extent_protocol::status
extent_client::load(extent_protocol::extentid_t eid) {
extent_protocol::status ret = extent_protocol::OK;
// Get Attributes first
extent_protocol::attr attr;
ret = cl->call(extent_protocol::getattr, eid, attr);
if (ret == extent_protocol::OK) {
extent_value *extent_obj;
extent_obj = new extent_value();
extent_obj->ext_attr.size = attr.size;
extent_obj->ext_attr.atime = attr.atime;
extent_obj->ext_attr.mtime = attr.mtime;
extent_obj->ext_attr.ctime = attr.ctime;
extent_obj->dirty = false;
tprintf("extent cache: load, get from server for %016llx \n", eid);
ret = cl->call(extent_protocol::get, eid, 0, attr.size, extent_obj->data);
if (ret != extent_protocol::OK) {
tprintf("extent cache: load, server returned error for %016llx \n", eid);
delete(extent_obj);
return ret;
}
tprintf("extent cache: load, get from server for %016llx data %s\n", eid,
extent_obj->data.c_str());
extent_cache[eid] = extent_obj;
}
return ret;
}
extent_protocol::status
extent_client::flush(extent_protocol::extentid_t eid)
{
extent_protocol::status ret = extent_protocol::OK;
int r;
ScopedLock ml(&extcache_mutex);
tprintf("extent_client:flush for %016llx \n", eid);
extent_value *extent_obj;
if (extent_cache.count(eid) > 0) {
extent_obj = extent_cache[eid];
if (extent_obj->dirty) {
tprintf("flush:Calling put for %016llx with value %s\n", eid, extent_obj->data.c_str());
ret = cl->call(extent_protocol::put, eid, -1, extent_obj->data, r);
}
tprintf("flush: not dirty, so just deleting in local\n");
delete(extent_cache[eid]);
extent_cache.erase(eid);
} else {
tprintf("flush: not in extent cache, calling remove for %016llx\n", eid);
ret = cl->call(extent_protocol::remove, eid, r);
}
return ret;
}
extent_protocol::status
extent_client::get(extent_protocol::extentid_t eid, int off, unsigned int size, std::string &buf)
{
extent_protocol::status ret = extent_protocol::OK;
ScopedLock ml(&extcache_mutex);
extent_value *extent_obj;
while(true) {
if (extent_cache.count(eid) > 0) {
tprintf("extent_client::get entry present for %016llx returning back! \n", eid);
extent_obj = extent_cache[eid];
if (off < 0)
buf = extent_obj->data;
else if (extent_obj->ext_attr.size < off)
buf = '\0';
else
buf = extent_obj->data.substr(off, size);
extent_obj->ext_attr.atime = time(NULL);
extent_cache[eid] = extent_obj;
tprintf("extent_client:: from cache get buf:%s\n", buf.c_str());
return extent_protocol::OK;
}
else {
tprintf("extent_client::get entry not present for %016llx loading now\n", eid);
ret = load(eid);
if (ret == extent_protocol::OK) continue;
break;
}
}
return ret;
}
extent_protocol::status
extent_client::getattr(extent_protocol::extentid_t eid,
extent_protocol::attr &attr)
{
extent_protocol::status ret = extent_protocol::OK;
ScopedLock ml(&extcache_mutex);
//extent_value *extent_obj;
while(true) {
if (extent_cache.count(eid) > 0) {
//extent_obj = extent_store[eid];
attr = extent_cache[eid]->ext_attr;
return extent_protocol::OK;
}
else {
tprintf("extent_client::getattr entry not present for %016llx loading now\n", eid);
ret = load(eid);
if (ret == extent_protocol::OK) continue;
break;
}
}
return ret;
}
extent_protocol::status
extent_client::put(extent_protocol::extentid_t eid, int off, std::string buf)
{
extent_protocol::status ret = extent_protocol::OK;
ScopedLock ml(&extcache_mutex);
extent_value *extent_obj;
while(true) {
if (extent_cache.count(eid) > 0) {
extent_obj = extent_cache[eid];
if (off < 0)
extent_obj->data = buf;
else {
if (off > extent_obj->ext_attr.size) {
extent_obj->data.resize(off);
extent_obj->data.append(buf);
}
else if (buf != "")
extent_obj->data.replace(off,buf.size(), buf);
else
extent_obj->data.resize(off);
}
extent_obj->ext_attr.mtime = extent_obj->ext_attr.ctime = time(NULL);
extent_obj->ext_attr.size = extent_obj->data.size();
extent_obj->dirty = true;
extent_cache[eid] = extent_obj;
tprintf("extent_client::put, extent_store: eid %016llx, buf %s\n", eid, buf.c_str());
return extent_protocol::OK;
}
else {
tprintf("extent_client::put entry not present for %016llx loading now\n", eid);
ret = load(eid);
if (ret == extent_protocol::OK) continue;
else {
//int r;
//ret = cl->call(extent_protocol::put, eid, off, buf, r);
//ret = load(eid);
extent_obj = new extent_value();
extent_cache[eid] = extent_obj;
tprintf("extent_client::put entry not present for %016llx local put\n", eid);
continue;
}
break;
}
}
return ret;
}
extent_protocol::status
extent_client::remove(extent_protocol::extentid_t eid)
{
extent_protocol::status ret = extent_protocol::OK;
ScopedLock ml(&extcache_mutex);
tprintf("Removing file for %016llx \n", eid);
delete(extent_cache[eid]);
extent_cache.erase(eid);
//int r;
//ret = cl->call(extent_protocol::remove, eid, r);
return ret;
}