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/*
*
* Copyright (c) 2006 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "Cpg.h"
#include "qpid/sys/Mutex.h"
#include "qpid/sys/posix/PrivatePosix.h"
#include "qpid/log/Statement.h"
#include <vector>
#include <limits>
#include <iterator>
#include <unistd.h>
namespace qpid {
namespace cluster {
using namespace std;
Cpg* Cpg::cpgFromHandle(cpg_handle_t handle) {
void* cpg=0;
check(cpg_context_get(handle, &cpg), "Cannot get CPG instance.");
if (!cpg) throw Exception("Cannot get CPG instance.");
return reinterpret_cast<Cpg*>(cpg);
}
// Global callback functions.
void Cpg::globalDeliver (
cpg_handle_t handle,
struct cpg_name *group,
uint32_t nodeid,
uint32_t pid,
void* msg,
int msg_len)
{
cpgFromHandle(handle)->handler.deliver(handle, group, nodeid, pid, msg, msg_len);
}
void Cpg::globalConfigChange(
cpg_handle_t handle,
struct cpg_name *group,
struct cpg_address *members, int nMembers,
struct cpg_address *left, int nLeft,
struct cpg_address *joined, int nJoined
)
{
cpgFromHandle(handle)->handler.configChange(handle, group, members, nMembers, left, nLeft, joined, nJoined);
}
int Cpg::getFd() {
int fd;
check(cpg_fd_get(handle, &fd), "Cannot get CPG file descriptor");
return fd;
}
Cpg::Cpg(Handler& h) : IOHandle(new sys::IOHandlePrivate), handler(h), isShutdown(false) {
cpg_callbacks_t callbacks = { &globalDeliver, &globalConfigChange };
check(cpg_initialize(&handle, &callbacks), "Cannot initialize CPG");
check(cpg_context_set(handle, this), "Cannot set CPG context");
// Note: CPG is currently unix-specific. If CPG is ported to
// windows then this needs to be refactored into
// qpid::sys::<platform>
IOHandle::impl->fd = getFd();
QPID_LOG(debug, "Initialized CPG handle 0x" << std::hex << handle);
}
Cpg::~Cpg() {
try {
shutdown();
} catch (const std::exception& e) {
QPID_LOG(error, "Exception in Cpg destructor: " << e.what());
}
}
void Cpg::join(const Name& group) {
check(cpg_join(handle, const_cast<Name*>(&group)),cantJoinMsg(group));
}
void Cpg::leave(const Name& group) {
check(cpg_leave(handle,const_cast<Name*>(&group)),cantLeaveMsg(group));
}
bool Cpg::isFlowControlEnabled() {
cpg_flow_control_state_t flowState;
check(cpg_flow_control_state_get(handle, &flowState), "Cannot get CPG flow control status.");
return flowState == CPG_FLOW_CONTROL_ENABLED;
}
// TODO aconway 2008-08-07: better handling of flow control.
// Wait for flow control to be disabled.
// FIXME aconway 2008-08-08: does flow control check involve a round-trip? If so maybe remove...
void Cpg::waitForFlowControl() {
int delayNs=1000; // one millisecond
int tries=8; // double the delay on each try.
while (isFlowControlEnabled() && tries > 0) {
QPID_LOG(warning, "CPG flow control enabled, retry in " << delayNs << "ns");
::usleep(delayNs);
--tries;
delayNs *= 2;
};
if (tries == 0) {
// FIXME aconway 2008-08-07: this is a fatal leave-the-cluster condition.
throw Cpg::Exception("CPG flow control enabled, failed to send.");
}
}
void Cpg::mcast(const Name& group, const iovec* iov, int iovLen) {
waitForFlowControl();
cpg_error_t result;
do {
result = cpg_mcast_joined(handle, CPG_TYPE_AGREED, const_cast<iovec*>(iov), iovLen);
if (result != CPG_ERR_TRY_AGAIN) check(result, cantMcastMsg(group));
} while(result == CPG_ERR_TRY_AGAIN);
}
void Cpg::shutdown() {
if (!isShutdown) {
QPID_LOG(debug,"Shutting down CPG");
isShutdown=true;
check(cpg_finalize(handle), "Error in shutdown of CPG");
}
}
string Cpg::errorStr(cpg_error_t err, const std::string& msg) {
switch (err) {
case CPG_OK: return msg+": ok";
case CPG_ERR_LIBRARY: return msg+": library";
case CPG_ERR_TIMEOUT: return msg+": timeout";
case CPG_ERR_TRY_AGAIN: return msg+": timeout. The aisexec daemon may not be running";
case CPG_ERR_INVALID_PARAM: return msg+": invalid param";
case CPG_ERR_NO_MEMORY: return msg+": no memory";
case CPG_ERR_BAD_HANDLE: return msg+": bad handle";
case CPG_ERR_ACCESS: return msg+": access denied. You may need to set your group ID to 'ais'";
case CPG_ERR_NOT_EXIST: return msg+": not exist";
case CPG_ERR_EXIST: return msg+": exist";
case CPG_ERR_NOT_SUPPORTED: return msg+": not supported";
case CPG_ERR_SECURITY: return msg+": security";
case CPG_ERR_TOO_MANY_GROUPS: return msg+": too many groups";
default:
assert(0);
return ": unknown";
};
}
std::string Cpg::cantJoinMsg(const Name& group) {
return "Cannot join CPG group "+group.str();
}
std::string Cpg::cantLeaveMsg(const Name& group) {
return "Cannot leave CPG group "+group.str();
}
std::string Cpg::cantMcastMsg(const Name& group) {
return "Cannot mcast to CPG group "+group.str();
}
MemberId Cpg::self() const {
unsigned int nodeid;
check(cpg_local_get(handle, &nodeid), "Cannot get local CPG identity");
return MemberId(nodeid, getpid());
}
ostream& operator <<(ostream& out, const MemberId& id) {
return out << std::hex << id.first << ":" << std::dec << id.second;
}
ostream& operator<<(ostream& o, const ConnectionId& c) {
return o << c.first << "-" << c.second;
}
ostream& operator<<(ostream& o, const cpg_name& name) {
return o << string(name.value, name.length);
}
}} // namespace qpid::cluster
// In proper namespace for ADL.
std::ostream& operator<<(std::ostream& o, const ::cpg_address& a) {
const char* reasonString;
switch (a.reason) {
case CPG_REASON_JOIN: reasonString = "joined"; break;
case CPG_REASON_LEAVE: reasonString = "left";break;
case CPG_REASON_NODEDOWN: reasonString = "node-down";break;
case CPG_REASON_NODEUP: reasonString = "node-up";break;
case CPG_REASON_PROCDOWN: reasonString = "process-down";break;
default:
assert(0);
reasonString = "";
}
return o << qpid::cluster::MemberId(a.nodeid, a.pid) << " " << reasonString;
}
namespace std {
ostream& operator<<(ostream& o, std::pair<cpg_address*,int> a) {
for (cpg_address* p = a.first; p < a.first+a.second; ++p)
o << *p << " ";
return o;
}
}
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