// GET /
bool ApiRequest::index()
{
// FIXME: thread safety.
// In order to make this method thread-safe, we must ensure that each director's
// json-write is done from within the director's worker thread and finally
// the reply be sent to the client from within the request's worker thread.
Buffer result;
JsonWriter json(result);
json.beginObject();
for (auto di: *directors_) {
Director* director = di.second;
json.name(director->name()).value(*director);
}
json.endObject();
result << "\n";
char slen[32];
snprintf(slen, sizeof(slen), "%zu", result.size());
request_->responseHeaders.push_back("Cache-Control", "no-cache");
request_->responseHeaders.push_back("Content-Type", "application/json");
request_->responseHeaders.push_back("Access-Control-Allow-Origin", "*");
request_->responseHeaders.push_back("Content-Length", slen);
request_->write<BufferSource>(result);
request_->finish();
return true;
}
void HealthMonitor::update() {
Director* director = static_cast<Director*>(backend_->manager());
setRequest(
"GET %s HTTP/1.1\r\n"
"Host: %s\r\n"
"x0-Health-Check: yes\r\n"
"x0-Director: %s\r\n"
"x0-Backend: %s\r\n"
"\r\n",
director->healthCheckRequestPath().c_str(),
director->healthCheckHostHeader().c_str(), director->name().c_str(),
backend_->name().c_str());
}
void DirectorPlugin::pass(HttpRequest* r, const std::string& directorName,
const std::string& backendName) {
auto i = directors_.find(directorName);
if (i == directors_.end()) {
r->log(Severity::error,
"director.pass(): No director with name '%s' configured.",
directorName.c_str());
internalServerError(r);
return;
}
Director* director = i->second.get();
// custom backend route
Backend* backend = nullptr;
if (!backendName.empty()) {
backend = director->findBackend(backendName);
if (!backend) {
// explicit backend specified, but not found -> do not serve.
r->log(Severity::error, "director: Requested backend '%s' not found.",
backendName.c_str());
internalServerError(r);
return;
}
}
#if !defined(NDEBUG)
server().log(Severity::trace, "director: passing request to %s [backend %s].",
director->name().c_str(), backend->name().c_str());
#endif
auto rn = requestNotes(r);
rn->manager = director;
r->onPostProcess.connect(std::bind(&DirectorPlugin::addVia, this, r));
director->schedule(rn, backend);
return;
}
void DirectorPlugin::balance(HttpRequest* r, const std::string& directorName,
const std::string& bucketName) {
auto i = directors_.find(directorName);
if (i == directors_.end()) {
r->log(Severity::error,
"director.balance(): No director with name '%s' configured.",
directorName.c_str());
internalServerError(r);
return;
}
Director* director = i->second.get();
RequestShaper::Node* bucket = nullptr;
if (!bucketName.empty()) {
bucket = director->findBucket(bucketName);
if (!bucket) {
// explicit bucket specified, but not found -> ignore.
bucket = director->rootBucket();
r->log(Severity::error,
"director: Requested bucket '%s' not found in director '%s'. "
"Assigning root bucket.",
bucketName.c_str(), directorName.c_str());
}
} else {
bucket = director->rootBucket();
}
auto rn = requestNotes(r);
rn->manager = director;
r->onPostProcess.connect(std::bind(&DirectorPlugin::addVia, this, r));
#if !defined(NDEBUG)
server().log(Severity::trace, "director: passing request to %s [%s].",
director->name().c_str(), bucket->name().c_str());
#endif
director->schedule(rn, bucket);
} // }}}
void HaproxyApi::csv(HttpRequest* r)
{
Buffer buf;
buf.push_back("# pxname,svname,qcur,qmax,scur,smax,slim,stot,bin,bout,dreq,dresp,ereq,econ,eresp,wretr,wredis,status,weight,act,bck,chkfail,chkdown,lastchg,downtime,qlimit,pid,iid,sid,throttle,lbtot,tracked,type,rate,rate_lim,rate_max,check_status,check_code,check_duration,hrsp_1xx,hrsp_2xx,hrsp_3xx,hrsp_4xx,hrsp_5xx,hrsp_other,hanafail,req_rate,req_rate_max,req_tot,cli_abrt,srv_abrt,\n");
for (auto di: *directors_) {
Director* director = di.second;
buildFrontendCSV(buf, director);
director->eachBackend([&](Backend* backend) {
// 01 pxname: proxy name
buf.push_back(director->name());
buf.push_back(',');
// 02 svname: service name (FRONTEND for frontend, BACKEND for backend, any name for server)
buf.push_back(backend->name()); // svname
// 03 qcur: current queued requests
// 04 qmax: max queued requests
buf.push_back(",0,0,"); // qcur, qmax
// 05 scur: current sessions
buf.push_back(backend->load().current());
buf.push_back(',');
// 06 smax: max sessions
buf.push_back(backend->load().max());
buf.push_back(",");
// 07 slim: sessions limit
buf.push_back(",");
// 08 stot: total sessions
buf.push_back(backend->load().total());
// 09 bin: bytes in
// 10 bout: bytes out
buf.push_back(",0,0,"); // bin, bout
// 11 dreq: denied requests
// 12 dresp: denied responses
buf.push_back("0,0,"); // dreq, dresp
// 13 ereq: request errors
// 14 econ: connection errors
// 15 eresp: response errors (among which srv_abrt)
buf.push_back("0,0,0,"); // ereq, econ, resp
// 16 wretr: retries (warning)
// 17 wredis: redispatches (warning)
buf.push_back("0,0,"); // wretr, wredis
// 18 status
if (!backend->isEnabled()) { // status
buf.push_back("MAINT");
} else if (backend->healthMonitor()) {
switch (backend->healthMonitor()->state()) {
case HealthState::Online:
buf.push_back("UP");
break;
case HealthState::Offline:
buf.push_back("DOWN");
break;
case HealthState::Undefined:
buf.push_back("UNKNOWN");
break;
}
} else {
buf.push_back("UP");
}
// weight: server weight (server), total weight (backend)
buf.push_back(",0,"); // weight
// 20 act: server is active (server), number of active servers (backend)
// 21 bck: server is backup (server), number of backup servers (backend)
switch (director->backendRole(backend)) { // act, bck
case BackendRole::Active:
buf.push_back("1,0,");
break;
case BackendRole::Backup:
buf.push_back("0,1,");
break;
case BackendRole::Terminate:
buf.push_back("0,0,");
break;
}
// 22 chkfail: number of failed checks
buf.push_back(','); // TODO
// 23 chkdown: number of UP->DOWN transitions
buf.push_back(','); // TODO
// 24 lastchg: last status change (in seconds)
buf.push_back(','); // TODO
// 25 downtime: total downtime (in seconds)
buf.push_back(','); // TODO
// 26 qlimit: queue limit
buf.push_back(',');
// 27 pid: process id (0 for first instance, 1 for second, ...)
buf.push_back("0,");
// 28 iid: unique proxy id
buf.push_back(',');
// 29 sid: service id (unique inside a proxy)
buf.push_back(',');
// 30 throttle: warm up status
buf.push_back(',');
// 31 lbtot: total number of times a server was selected
buf.push_back(','); // TODO
// 32 tracked: id of proxy/server if tracking is enabled
buf.push_back(',');
// 33 type (0=frontend, 1=backend, 2=server, 3=socket)
buf.push_back("2,");
// 34 rate: number of sessions per second over last elapsed second
buf.push_back(','); // TODO
// 35 rate_lim: limit on new sessions per second
buf.push_back(',');
// 36 rate_max: max number of new sessions per second
buf.push_back(',');
// 37 check_status: status of last health check, one of:
// - UNK -> unknown
// - INI -> initializing
// - SOCKERR -> socket error
// - L4OK -> check passed on layer 4, no upper layers testing enabled
// - L4TMOUT -> layer 1-4 timeout
// - L4CON -> layer 1-4 connection problem, for example "Connection refused" (tcp rst) or "No route to host" (icmp)
// - L6OK -> check passed on layer 6
// - L6TOUT -> layer 6 (SSL) timeout
// - L6RSP -> layer 6 invalid response - protocol error
// - L7OK -> check passed on layer 7
// - L7OKC -> check conditionally passed on layer 7, for example 404 with disable-on-404
// - L7TOUT -> layer 7 (HTTP/SMTP) timeout
// - L7RSP -> layer 7 invalid response - protocol error
// - L7STS -> layer 7 response error, for example HTTP 5xx
buf.push_back("UNK,"); // TODO
// 38 check_code: layer5-7 code, if available
buf.push_back(',');
// 39 check_duration: time in ms took to finish last health check
buf.push_back(','); // TODO
// 40 hrsp_1xx: http responses with 1xx code
buf.push_back(','); // TODO
// 41 hrsp_2xx: http responses with 2xx code
buf.push_back(','); // TODO
// 42 hrsp_3xx: http responses with 3xx code
buf.push_back(','); // TODO
// 43 hrsp_4xx: http responses with 4xx code
buf.push_back(','); // TODO
// 44 hrsp_5xx: http responses with 5xx code
buf.push_back(','); // TODO
// 45 hrsp_other: http responses with other codes (protocol error)
buf.push_back(','); // TODO
// 46 hanafail: failed health checks details
buf.push_back(','); // TODO
// 47 req_rate: HTTP requests per second over last elapsed second
buf.push_back(',');
// 48 req_rate_max: max number of HTTP requests per second observed
buf.push_back(',');
// 49 req_tot: total number of HTTP requests received
buf.push_back(backend->load().total());
buf.push_back(',');
// 50 cli_abrt: number of data transfers aborted by the client
buf.push_back(','); // TODO
// 51 srv_abrt: number of data transfers aborted by the server (inc. in eresp)
buf.push_back(','); // TODO
buf.push_back('\n');
});
}
char slen[32];
snprintf(slen, sizeof(slen), "%zu", buf.size());
r->responseHeaders.push_back("Content-Length", slen);
r->responseHeaders.push_back("Content-Type", "text/plain"); // HAproxy software does sent this one instead of text/csv.
r->responseHeaders.push_back("Cache-Control", "no-cache");
r->write<x0::BufferSource>(buf);
r->finish();
}