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feat: prom stream scrape and stream process (#1925)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| #include "prometheus/component/StreamScraper.h" | ||
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| #include <cstddef> | ||
| #include <memory> | ||
| #include <string> | ||
| #include <utility> | ||
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| #include "Flags.h" | ||
| #include "Labels.h" | ||
| #include "common/StringTools.h" | ||
| #include "models/PipelineEventGroup.h" | ||
| #include "pipeline/queue/ProcessQueueItem.h" | ||
| #include "pipeline/queue/ProcessQueueManager.h" | ||
| #include "prometheus/Utils.h" | ||
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| DEFINE_FLAG_INT64(prom_stream_bytes_size, "stream bytes size", 1024 * 1024); | ||
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| DEFINE_FLAG_BOOL(enable_prom_stream_scrape, "enable prom stream scrape", true); | ||
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| using namespace std; | ||
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| namespace logtail::prom { | ||
| size_t StreamScraper::MetricWriteCallback(char* buffer, size_t size, size_t nmemb, void* data) { | ||
| uint64_t sizes = size * nmemb; | ||
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| if (buffer == nullptr || data == nullptr) { | ||
| return 0; | ||
| } | ||
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| auto* body = static_cast<StreamScraper*>(data); | ||
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| size_t begin = 0; | ||
| for (size_t end = begin; end < sizes; ++end) { | ||
| if (buffer[end] == '\n') { | ||
| if (begin == 0 && !body->mCache.empty()) { | ||
| body->mCache.append(buffer, end); | ||
| body->AddEvent(body->mCache.data(), body->mCache.size()); | ||
| body->mCache.clear(); | ||
| } else if (begin != end) { | ||
| body->AddEvent(buffer + begin, end - begin); | ||
| } | ||
| begin = end + 1; | ||
| } | ||
| } | ||
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| if (begin < sizes) { | ||
| body->mCache.append(buffer + begin, sizes - begin); | ||
| } | ||
| body->mRawSize += sizes; | ||
| body->mCurrStreamSize += sizes; | ||
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| if (BOOL_FLAG(enable_prom_stream_scrape) && body->mCurrStreamSize >= (size_t)INT64_FLAG(prom_stream_bytes_size)) { | ||
| body->mStreamIndex++; | ||
| body->SendMetrics(); | ||
| } | ||
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| return sizes; | ||
| } | ||
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| void StreamScraper::AddEvent(const char* line, size_t len) { | ||
| if (IsValidMetric(StringView(line, len))) { | ||
| auto* e = mEventGroup.AddRawEvent(true, mEventPool); | ||
| auto sb = mEventGroup.GetSourceBuffer()->CopyString(line, len); | ||
| e->SetContentNoCopy(sb); | ||
| mScrapeSamplesScraped++; | ||
| } | ||
| } | ||
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| void StreamScraper::FlushCache() { | ||
| if (!mCache.empty()) { | ||
| AddEvent(mCache.data(), mCache.size()); | ||
| mCache.clear(); | ||
| } | ||
| } | ||
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| void StreamScraper::SetTargetLabels(PipelineEventGroup& eGroup) const { | ||
| mTargetLabels.Range([&eGroup](const std::string& key, const std::string& value) { eGroup.SetTag(key, value); }); | ||
| } | ||
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| void StreamScraper::PushEventGroup(PipelineEventGroup&& eGroup) const { | ||
| auto item = make_unique<ProcessQueueItem>(std::move(eGroup), mInputIndex); | ||
| #ifdef APSARA_UNIT_TEST_MAIN | ||
| mItem.emplace_back(std::move(item)); | ||
| return; | ||
| #endif | ||
| while (true) { | ||
| if (ProcessQueueManager::GetInstance()->PushQueue(mQueueKey, std::move(item)) == 0) { | ||
| break; | ||
| } | ||
| usleep(10 * 1000); | ||
| } | ||
| } | ||
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| void StreamScraper::SendMetrics() { | ||
| mEventGroup.SetMetadata(EventGroupMetaKey::PROMETHEUS_SCRAPE_TIMESTAMP_MILLISEC, | ||
| ToString(mScrapeTimestampMilliSec)); | ||
| mEventGroup.SetMetadata(EventGroupMetaKey::PROMETHEUS_STREAM_ID, GetId() + ToString(mScrapeTimestampMilliSec)); | ||
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| SetTargetLabels(mEventGroup); | ||
| PushEventGroup(std::move(mEventGroup)); | ||
| mEventGroup = PipelineEventGroup(std::make_shared<SourceBuffer>()); | ||
| mCurrStreamSize = 0; | ||
| } | ||
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| void StreamScraper::Reset() { | ||
| mEventGroup = PipelineEventGroup(std::make_shared<SourceBuffer>()); | ||
| mRawSize = 0; | ||
| mCurrStreamSize = 0; | ||
| mCache.clear(); | ||
| mStreamIndex = 0; | ||
| mScrapeSamplesScraped = 0; | ||
| } | ||
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| void StreamScraper::SetAutoMetricMeta(double scrapeDurationSeconds, bool upState, const string& scrapeState) { | ||
| mEventGroup.SetMetadata(EventGroupMetaKey::PROMETHEUS_SCRAPE_STATE, scrapeState); | ||
| mEventGroup.SetMetadata(EventGroupMetaKey::PROMETHEUS_SCRAPE_TIMESTAMP_MILLISEC, | ||
| ToString(mScrapeTimestampMilliSec)); | ||
| mEventGroup.SetMetadata(EventGroupMetaKey::PROMETHEUS_SAMPLES_SCRAPED, ToString(mScrapeSamplesScraped)); | ||
| mEventGroup.SetMetadata(EventGroupMetaKey::PROMETHEUS_SCRAPE_DURATION, ToString(scrapeDurationSeconds)); | ||
| mEventGroup.SetMetadata(EventGroupMetaKey::PROMETHEUS_SCRAPE_RESPONSE_SIZE, ToString(mRawSize)); | ||
| mEventGroup.SetMetadata(EventGroupMetaKey::PROMETHEUS_UP_STATE, ToString(upState)); | ||
| mEventGroup.SetMetadata(EventGroupMetaKey::PROMETHEUS_STREAM_ID, GetId() + ToString(mScrapeTimestampMilliSec)); | ||
| mEventGroup.SetMetadata(EventGroupMetaKey::PROMETHEUS_STREAM_TOTAL, ToString(mStreamIndex)); | ||
| } | ||
| std::string StreamScraper::GetId() { | ||
| return mHash; | ||
| } | ||
| void StreamScraper::SetScrapeTime(std::chrono::system_clock::time_point scrapeTime) { | ||
| mScrapeTimestampMilliSec | ||
| = std::chrono::duration_cast<std::chrono::milliseconds>(scrapeTime.time_since_epoch()).count(); | ||
| } | ||
| } // namespace logtail::prom |
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