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// -*- mode: c++; c-file-style: "k&r"; c-basic-offset: 4 -*-
/***********************************************************************
*
* lockserver/server.cc:
* A lockserver replica.
*
* Copyright 2015 Naveen Kr. Sharma <naveenks@cs.washington.edu>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
**********************************************************************/
#include "lockserver/server.h"
int
main(int argc, char **argv)
{
int index = -1;
const char *configPath = NULL;
// Parse arguments
int opt;
char *strtolPtr;
while ((opt = getopt(argc, argv, "c:i:")) != -1) {
switch (opt) {
case 'c':
configPath = optarg;
break;
case 'i':
index = strtol(optarg, &strtolPtr, 10);
if ((*optarg == '\0') || (*strtolPtr != '\0') || (index < 0)) {
fprintf(stderr, "option -i requires a numeric arg\n");
}
break;
default:
fprintf(stderr, "Unknown argument %s\n", argv[optind]);
}
}
if (!configPath) {
fprintf(stderr, "option -c is required\n");
return EXIT_FAILURE;
}
if (index == -1) {
fprintf(stderr, "option -i is required\n");
return EXIT_FAILURE;
}
// Load configuration
std::ifstream configStream(configPath);
if (configStream.fail()) {
fprintf(stderr, "unable to read configuration file: %s\n", configPath);
return EXIT_FAILURE;
}
transport::Configuration config(configStream);
if (index >= config.n) {
fprintf(stderr, "replica index %d is out of bounds; "
"only %d replicas defined\n", index, config.n);
return EXIT_FAILURE;
}
UDPTransport transport(0.0, 0.0, 0);
lockserver::LockServer server;
replication::ir::IRReplica replica(config, index, &transport, &server);
transport.Run();
return EXIT_SUCCESS;
}
namespace lockserver {
using namespace proto;
LockServer::LockServer() { }
LockServer::~LockServer() { }
void
LockServer::ExecInconsistentUpcall(const string &str1)
{
Debug("ExecInconsistent: %s\n", str1.c_str());
Request request;
request.ParseFromString(str1);
string key = request.key();
uint64_t client_id = request.clientid();
if (request.type()) { // Lock operation.
Warning("Lock operation being sent as Inconsistent. Ignored.");
} else {
if (locks.find(key) != locks.end()) {
if (client_id == locks[key]) {
Debug("Releasing lock %lu: %s", client_id, key.c_str());
locks.erase(key);
} else {
Debug("Lock held by someone else %lu: %s, %lu",
client_id, key.c_str(), locks[key]);
}
} else {
Debug("Lock held by no one.");
}
}
}
void
LockServer::ExecConsensusUpcall(const string &str1, string &str2)
{
Debug("ExecConsensus: %s\n", str1.c_str());
Request request;
Reply reply;
request.ParseFromString(str1);
string key = request.key();
uint64_t client_id = request.clientid();
reply.set_key(key);
int status = 0;
if (request.type()) { // Lock operation.
if (locks.find(key) == locks.end()) {
Debug("Assigning lock %lu: %s", client_id, key.c_str());
locks[key] = client_id;
} else if (locks[key] != client_id) {
Debug("Lock already held %lu: %s", client_id, key.c_str());
status = -1;
}
} else {
Warning("Unlock operation being sent as Consensus");
if (locks.find(key) == locks.end()) {
Debug("Lock held by no-one %lu: %s", client_id, key.c_str());
status = -2;
} else if (locks[key] != client_id) {
Debug("Lock held by someone else %lu: %s, %lu",
client_id, key.c_str(), locks[key]);
status = -2;
} else {
Debug("Releasing lock %lu: %s", client_id, key.c_str());
locks.erase(key);
}
}
reply.set_status(status);
reply.SerializeToString(&str2);
}
void
LockServer::UnloggedUpcall(const string &str1, string &str2)
{
Debug("Unlogged: %s\n", str1.c_str());
}
} // namespace lockserver