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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/log/Statement.h"
#include <vector>
#include <limits>
#include <iterator>
namespace qpid {
namespace cluster {
using namespace std;
// Global vector of Cpg pointers by handle.
// TODO aconway 2007-06-12: Replace this with cpg_get/set_context,
// coming in in RHEL 5.1.
class Cpg::Handles
{
public:
void put(cpg_handle_t handle, Cpg::Handler* handler) {
sys::Mutex::ScopedLock l(lock);
uint32_t index=uint32_t(handle); // Lower 32 bits is an array index.
if (index >= handles.size())
handles.resize(index+1, 0);
handles[index] = handler;
}
Cpg::Handler* get(cpg_handle_t handle) {
sys::Mutex::ScopedLock l(lock);
uint32_t index=uint32_t(handle); // Lower 32 bits is an array index.
assert(index < handles.size());
assert(handles[index]);
return handles[index];
}
private:
sys::Mutex lock;
vector<Cpg::Handler*> handles;
};
Cpg::Handles Cpg::handles;
// Global callback functions call per-object callbacks via handles vector.
void Cpg::globalDeliver (
cpg_handle_t handle,
struct cpg_name *group,
uint32_t nodeid,
uint32_t pid,
void* msg,
int msg_len)
{
Cpg::Handler* handler=handles.get(handle);
if (handler)
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
)
{
Cpg::Handler* handler=handles.get(handle);
if (handler)
handler->configChange(handle, group, members, nMembers, left, nLeft, joined, nJoined);
}
Cpg::Cpg(Handler& h) : handler(h) {
cpg_callbacks_t callbacks = { &globalDeliver, &globalConfigChange };
check(cpg_initialize(&handle, &callbacks), "Cannot initialize CPG");
handles.put(handle, &handler);
QPID_LOG(debug, "Initialize CPG handle " << handle);
}
Cpg::~Cpg() {
try {
shutdown();
} catch (const std::exception& e) {
QPID_LOG(error, "Exception in Cpg destructor: " << e.what());
}
}
void Cpg::shutdown() {
QPID_LOG(debug, "Shutdown CPG handle " << handle);
if (handles.get(handle)) {
QPID_LOG(debug, "Finalize CPG handle " << handle);
handles.put(handle, 0);
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();
}
uint32_t Cpg::getLocalNoideId() const {
unsigned int nodeid;
check(cpg_local_get(handle, &nodeid), "Cannot get local node ID");
assert(nodeid <= std::numeric_limits<uint32_t>::max());
return nodeid;
}
ostream& operator<<(ostream& o, std::pair<cpg_address*,int> a) {
ostream_iterator<Cpg::Id> i(o, " ");
std::copy(a.first, a.first+a.second, i);
return o;
}
static int popbyte(uint32_t& n) {
uint8_t b=n&0xff;
n>>=8;
return b;
}
ostream& operator <<(ostream& out, const Cpg::Id& id) {
uint32_t node=id.nodeId();
out << popbyte(node);
for (int i = 0; i < 3; i++)
out << "." << popbyte(node);
return out << ":" << id.pid();
}
ostream& operator <<(ostream& out, const cpg_name& name) {
return out << string(name.value, name.length);
}
}} // namespace qpid::cluster
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