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#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <vespa/vespalib/util/signalhandler.h>
#include <vespa/vespalib/util/exception.h>
#include <vespa/fnet/frt/supervisor.h>
#include <vespa/fnet/frt/target.h>
#include <vespa/fnet/frt/rpcrequest.h>
#include <vespa/log/log.h>
LOG_SETUP("vespa-sentinel-cmd");
class Cmd
{
private:
std::unique_ptr<fnet::frt::StandaloneFRT> _server;
FRT_Target *_target;
public:
Cmd() : _server(), _target(nullptr) {}
~Cmd();
int run(const char *cmd, const char *arg);
void initRPC(const char *spec);
void finiRPC();
};
Cmd::~Cmd()
{
LOG_ASSERT(! _server);
LOG_ASSERT(_target == nullptr);
}
void usage()
{
fprintf(stderr, "usage: vespa-sentinel-cmd <cmd> [arg]\n");
fprintf(stderr, "with cmd one of:\n");
fprintf(stderr, " list\n");
fprintf(stderr, " restart {service}\n");
fprintf(stderr, " start {service}\n");
fprintf(stderr, " stop {service}\n");
}
void
Cmd::initRPC(const char *spec)
{
_server = std::make_unique<fnet::frt::StandaloneFRT>();
_target = _server->supervisor().GetTarget(spec);
}
void
Cmd::finiRPC()
{
if (_target != nullptr) {
_target->SubRef();
_target = nullptr;
}
_server.reset();
}
int
Cmd::run(const char *cmd, const char *arg)
{
int retval = 0;
try {
initRPC("tcp/localhost:19097");
} catch (vespalib::Exception &e) {
fprintf(stderr, "vespa-sentinel-cmd: exception in network initialization: %s\n",
e.what());
return 2;
}
FRT_RPCRequest *req = _server->supervisor().AllocRPCRequest();
req->SetMethodName(cmd);
if (arg) {
// one param
req->GetParams()->AddString(arg);
}
_target->InvokeSync(req, 5.0);
if (req->IsError()) {
fprintf(stderr, "vespa-sentinel-cmd '%s' error %d: %s\n",
cmd, req->GetErrorCode(), req->GetErrorMessage());
retval = 1;
} else {
FRT_Values &answer = *(req->GetReturn());
const char *atypes = answer.GetTypeString();
fprintf(stderr, "vespa-sentinel-cmd '%s' OK.\n", cmd);
uint32_t idx = 0;
while (atypes != nullptr && *atypes != '\0') {
switch (*atypes) {
case 's':
printf("%s\n", answer[idx]._string._str);
break;
default:
printf("BAD: unknown type %c\n", *atypes);
}
++atypes;
++idx;
}
}
req->SubRef();
finiRPC();
return retval;
}
const char *
parseCmd(const char *arg)
{
if (strcmp(arg, "list") == 0) {
return "sentinel.ls";
} else if (strcmp(arg, "restart") == 0) {
return "sentinel.service.restart";
} else if (strcmp(arg, "start") == 0) {
return "sentinel.service.start";
} else if (strcmp(arg, "stop") == 0) {
return "sentinel.service.stop";
}
return 0;
}
void hookSignals() {
using SIG = vespalib::SignalHandler;
SIG::PIPE.ignore();
}
int main(int argc, char** argv)
{
int retval = 1;
const char *cmd = 0;
if (argc > 1) {
cmd = parseCmd(argv[1]);
}
if (cmd) {
hookSignals();
Cmd runner;
retval = runner.run(cmd, argc > 2 ? argv[2] : 0);
} else {
usage();
}
return retval;
}
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