void AgencyCallback::refetchAndUpdate(bool needToAcquireMutex) {
if (!_needsValue) {
// no need to pass any value to the callback
if (needToAcquireMutex) {
CONDITION_LOCKER(locker, _cv);
executeEmpty();
} else {
executeEmpty();
}
return;
}
AgencyCommResult result = _agency.getValues(key);
if (!result.successful()) {
LOG(ERR) << "Callback getValues to agency was not successful: "
<< result.errorCode() << " " << result.errorMessage();
return;
}
std::vector<std::string> kv =
basics::StringUtils::split(AgencyComm::prefixPath() + key,'/');
kv.erase(std::remove(kv.begin(), kv.end(), ""), kv.end());
std::shared_ptr<VPackBuilder> newData = std::make_shared<VPackBuilder>();
newData->add(result.slice()[0].get(kv));
if (needToAcquireMutex) {
CONDITION_LOCKER(locker, _cv);
checkValue(newData);
} else {
checkValue(newData);
}
}
ServerState::RoleEnum ServerState::checkServersList (std::string const& id) {
// fetch value at Plan/DBServers
// we need to do this to determine the server's role
const std::string key = "Plan/DBServers";
AgencyComm comm;
AgencyCommResult result;
{
AgencyCommLocker locker("Plan", "READ");
if (locker.successful()) {
result = comm.getValues(key, true);
}
}
if (! result.successful()) {
const std::string endpoints = AgencyComm::getEndpointsString();
LOG_TRACE("Could not fetch configuration from agency endpoints (%s): "
"got status code %d, message: %s, key: %s",
endpoints.c_str(),
result._statusCode,
result.errorMessage().c_str(),
key.c_str());
return ServerState::ROLE_UNDEFINED;
}
ServerState::RoleEnum role = ServerState::ROLE_UNDEFINED;
// check if we can find ourselves in the list returned by the agency
result.parse("Plan/DBServers/", false);
std::map<std::string, AgencyCommResultEntry>::const_iterator it = result._values.find(id);
if (it != result._values.end()) {
// we are in the list. this means we are a primary server
role = ServerState::ROLE_PRIMARY;
}
else {
// check if we are a secondary...
it = result._values.begin();
while (it != result._values.end()) {
const std::string name = triagens::basics::JsonHelper::getStringValue((*it).second._json, "");
if (name == id) {
role = ServerState::ROLE_SECONDARY;
_idOfPrimary = it->first;
break;
}
++it;
}
}
return role;
}
int ServerState::lookupLocalInfoToId (std::string const& localInfo,
std::string& id) {
// fetch value at Plan/DBServers
// we need to do this to determine the server's role
const std::string key = "Target/MapLocalToID";
int count = 0;
while (++count <= 600) {
AgencyComm comm;
AgencyCommResult result;
{
AgencyCommLocker locker("Target", "READ");
if (locker.successful()) {
result = comm.getValues(key, true);
}
}
if (! result.successful()) {
const std::string endpoints = AgencyComm::getEndpointsString();
LOG_DEBUG("Could not fetch configuration from agency endpoints (%s): "
"got status code %d, message: %s, key: %s",
endpoints.c_str(),
result._statusCode,
result.errorMessage().c_str(),
key.c_str());
}
else {
result.parse("Target/MapLocalToID/", false);
std::map<std::string, AgencyCommResultEntry>::const_iterator it = result._values.find(localInfo);
if (it != result._values.end()) {
TRI_json_t const* json = it->second._json;
Json j(TRI_UNKNOWN_MEM_ZONE, json, Json::NOFREE);
id = triagens::basics::JsonHelper::getStringValue(json, "ID", "");
if (id.empty()) {
LOG_ERROR("ID not set!");
return TRI_ERROR_CLUSTER_COULD_NOT_DETERMINE_ID;
}
std::string description
= triagens::basics::JsonHelper::getStringValue(json, "Description", "");
if (! description.empty()) {
setDescription(description);
}
return TRI_ERROR_NO_ERROR;
}
}
sleep(1);
};
return TRI_ERROR_CLUSTER_COULD_NOT_DETERMINE_ID;
}
ServerState::RoleEnum ServerState::checkCoordinatorsList (std::string const& id) {
// fetch value at Plan/Coordinators
// we need to do this to determine the server's role
const std::string key = "Plan/Coordinators";
AgencyComm comm;
AgencyCommResult result;
{
AgencyCommLocker locker("Plan", "READ");
if (locker.successful()) {
result = comm.getValues(key, true);
}
}
if (! result.successful()) {
const std::string endpoints = AgencyComm::getEndpointsString();
LOG_TRACE("Could not fetch configuration from agency endpoints (%s): "
"got status code %d, message: %s, key: %s",
endpoints.c_str(),
result._statusCode,
result.errorMessage().c_str(),
key.c_str());
return ServerState::ROLE_UNDEFINED;
}
if (! result.parse("Plan/Coordinators/", false)) {
LOG_TRACE("Got an invalid JSON response for Plan/Coordinators");
return ServerState::ROLE_UNDEFINED;
}
// check if we can find ourselves in the list returned by the agency
std::map<std::string, AgencyCommResultEntry>::const_iterator it = result._values.find(id);
if (it != result._values.end()) {
// we are in the list. this means we are a primary server
return ServerState::ROLE_COORDINATOR;
}
return ServerState::ROLE_UNDEFINED;
}