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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#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");
namespace {
struct Method {
const char * name;
const char * rpcMethod;
bool noArgNeeded;
bool needsTimeoutArg;
};
const Method methods[] = {
{ "list", "sentinel.ls", true, false },
{ "restart", "sentinel.service.restart", false, false },
{ "start", "sentinel.service.start", false, false },
{ "stop", "sentinel.service.stop", false, false },
{ "connectivity", "sentinel.report.connectivity", true, true }
};
}
class Cmd
{
private:
std::unique_ptr<fnet::frt::StandaloneFRT> _server;
FRT_Target *_target;
public:
Cmd() : _server(), _target(nullptr) {}
~Cmd();
int run(const Method &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");
fprintf(stderr, " connectivity [milliseconds]\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->internal_subref();
_target = nullptr;
}
_server.reset();
}
int
Cmd::run(const Method &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.rpcMethod);
int pingTimeoutMs = 5000;
if (cmd.needsTimeoutArg) {
if (arg) {
pingTimeoutMs = atoi(arg);
}
req->GetParams()->AddInt32(pingTimeoutMs);
} else if (arg) {
// one param
req->GetParams()->AddString(arg);
}
_target->InvokeSync(req, 2 * pingTimeoutMs * 0.001);
if (req->IsError()) {
fprintf(stderr, "vespa-sentinel-cmd '%s' error %d: %s\n",
cmd.name, 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.name);
if (atypes && (strcmp(atypes, "SS") == 0)) {
uint32_t numHosts = answer[0]._string_array._len;
uint32_t numStats = answer[1]._string_array._len;
FRT_StringValue *hosts = answer[0]._string_array._pt;
FRT_StringValue *stats = answer[1]._string_array._pt;
uint32_t ml = 0;
uint32_t j;
for (j = 0; j < numHosts; ++j) {
uint32_t hl = strlen(hosts[j]._str);
if (hl > ml) ml = hl;
}
for (j = 0; j < numHosts && j < numStats; ++j) {
printf("%-*s -> %s\n", ml, hosts[j]._str, stats[j]._str);
}
for (; j < numHosts; ++j) {
printf("Extra host: %s\n", hosts[j]._str);
}
for (; j < numStats; ++j) {
printf("Extra stat: %s\n", stats[j]._str);
}
} else {
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->internal_subref();
finiRPC();
return retval;
}
const Method *
parseCmd(const char *arg)
{
for (const auto & method : methods) {
if (strcmp(arg, method.name) == 0) {
return &method;
}
}
return nullptr;
}
void hookSignals() {
using SIG = vespalib::SignalHandler;
SIG::PIPE.ignore();
}
int main(int argc, char** argv)
{
int retval = 1;
const Method *cmd = nullptr;
if (argc > 1) {
cmd = parseCmd(argv[1]);
}
const char *extraArg = (argc > 2 ? argv[2] : nullptr);
if (cmd && (extraArg || cmd->noArgNeeded)) {
hookSignals();
Cmd runner;
retval = runner.run(*cmd, extraArg);
} else {
usage();
}
return retval;
}
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