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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "state_api.h"
#include <vespa/vespalib/util/jsonwriter.h>
namespace vespalib {
namespace {
struct ConfigRenderer : ComponentConfigProducer::Consumer {
JSONStringer &json;
ConfigRenderer(JSONStringer &j) : json(j) {}
void add(const ComponentConfigProducer::Config &config) override {
json.appendKey(config.name);
json.beginObject();
json.appendKey("generation");
json.appendInt64(config.gen);
if (!config.msg.empty()) {
json.appendKey("message");
json.appendString(config.msg);
}
json.endObject();
}
};
struct ConfigGenerationObserver : ComponentConfigProducer::Consumer {
size_t maxGen;
bool seenSome;
ConfigGenerationObserver() : maxGen(0), seenSome(false) {}
void add(const ComponentConfigProducer::Config &config) override {
if (seenSome) {
maxGen = std::max(maxGen, config.gen);
} else {
maxGen = config.gen;
seenSome = true;
}
}
};
void build_health_status(JSONStringer &json, const HealthProducer &healthProducer) {
HealthProducer::Health health = healthProducer.getHealth();
json.appendKey("status");
json.beginObject();
json.appendKey("code");
if (health.ok) {
json.appendString("up");
} else {
json.appendString("down");
json.appendKey("message");
json.appendString(health.msg);
}
json.endObject();
}
vespalib::string get_consumer(const std::map<vespalib::string,vespalib::string> ¶ms,
vespalib::stringref default_consumer)
{
auto consumer_lookup = params.find("consumer");
if (consumer_lookup == params.end()) {
return default_consumer;
}
return consumer_lookup->second;
}
void render_link(JSONStringer &json, const vespalib::string &host, const vespalib::string &path) {
json.beginObject();
json.appendKey("url");
json.appendString("http://" + host + path);
json.endObject();
}
vespalib::string respond_root(const JsonHandlerRepo &repo, const vespalib::string &host) {
JSONStringer json;
json.beginObject();
json.appendKey("resources");
json.beginArray();
for (auto path: {"/state/v1/health", "/state/v1/metrics", "/state/v1/config"}) {
render_link(json, host, path);
}
for (const vespalib::string &path: repo.get_root_resources()) {
render_link(json, host, path);
}
json.endArray();
json.endObject();
return json.toString();
}
vespalib::string respond_health(const HealthProducer &healthProducer) {
JSONStringer json;
json.beginObject();
build_health_status(json, healthProducer);
json.endObject();
return json.toString();
}
vespalib::string respond_metrics(const vespalib::string &consumer,
const HealthProducer &healthProducer,
MetricsProducer &metricsProducer)
{
JSONStringer json;
json.beginObject();
build_health_status(json, healthProducer);
{ // metrics
vespalib::string metrics = metricsProducer.getMetrics(consumer);
if (!metrics.empty()) {
json.appendKey("metrics");
json.appendJSON(metrics);
}
}
json.endObject();
return json.toString();
}
vespalib::string respond_config(ComponentConfigProducer &componentConfigProducer) {
JSONStringer json;
json.beginObject();
{ // config
ConfigRenderer renderer(json);
json.appendKey("config");
json.beginObject();
ConfigGenerationObserver observer;
componentConfigProducer.getComponentConfig(observer);
if (observer.seenSome) {
json.appendKey("generation");
json.appendInt64(observer.maxGen);
}
componentConfigProducer.getComponentConfig(renderer);
json.endObject();
}
json.endObject();
return json.toString();
}
} // namespace vespalib::<unnamed>
vespalib::string
StateApi::get(const vespalib::string &host,
const vespalib::string &path,
const std::map<vespalib::string,vespalib::string> ¶ms) const
{
if (path == "/state/v1/" || path == "/state/v1") {
return respond_root(_handler_repo, host);
} else if (path == "/state/v1/health") {
return respond_health(_healthProducer);
} else if (path == "/state/v1/metrics") {
// Using a 'statereporter' consumer by default removes many uninteresting per-thread
// metrics but retains their aggregates.
return respond_metrics(get_consumer(params, "statereporter"), _healthProducer, _metricsProducer);
} else if (path == "/state/v1/config") {
return respond_config(_componentConfigProducer);
} else if (path == "/metrics/total") {
return _metricsProducer.getTotalMetrics(get_consumer(params, ""));
} else {
return _handler_repo.get(host, path, params);
}
}
//-----------------------------------------------------------------------------
StateApi::StateApi(const HealthProducer &hp,
MetricsProducer &mp,
ComponentConfigProducer &ccp)
: _healthProducer(hp),
_metricsProducer(mp),
_componentConfigProducer(ccp)
{
}
} // namespace vespalib
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