| 1 | const got = require('got')
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| 2 | const url = require('url')
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| 3 | const { logproto } = require('./proto')
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| 4 | const snappy = require('snappy')
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| 5 | const protoHelpers = require('./proto/helpers')
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| 6 |
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| 7 | module.exports = class Batcher {
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| 8 | constructor (options) {
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| 9 | this.options = options
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| 10 | this.url = new url.URL(this.options.host + '/api/prom/push').toString()
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| 11 | this.interval = this.options.interval
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| 12 | ? Number(this.options.interval) * 1000
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| 13 | : 5000
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| 14 | this.circuitBreakerInterval = 60000
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| 15 | this.batch = {
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| 16 | streams: []
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| 17 | }
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| 18 | this.contentType = 'application/x-protobuf'
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| 19 | if (this.options.json) {
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| 20 | this.contentType = 'application/json'
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| 21 | }
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| 22 | this.options.batching && this.run()
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| 23 | }
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| 24 |
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| 25 | wait (duration) {
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| 26 | return new Promise(resolve => {
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| 27 | setTimeout(resolve, duration)
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| 28 | })
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| 29 | }
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| 30 |
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| 31 | pushLogEntry (logEntry) {
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| 32 | if (this.options.replaceTimestamp) {
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| 33 | logEntry.entries[0].ts = Date.now()
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| 34 | }
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| 35 |
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| 36 | if (
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| 37 | this.options.batching !== undefined &&
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| 38 | this.options.batching === false
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| 39 | ) {
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| 40 | if (!this.options.json) {
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| 41 | logEntry = protoHelpers.createProtoTimestamps(logEntry)
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| 42 | }
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| 43 | this.sendBatchToLoki(logEntry)
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| 44 | } else {
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| 45 | if (this.options.json) {
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| 46 | this.batch.streams.push(logEntry)
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| 47 | } else {
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| 48 | const { streams } = this.batch
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| 49 |
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| 50 | logEntry = protoHelpers.createProtoTimestamps(logEntry)
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| 51 |
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| 52 | const match = streams.findIndex(
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| 53 | stream => stream.labels === logEntry.labels
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| 54 | )
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| 55 |
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| 56 | if (match > -1) {
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| 57 | logEntry.entries.forEach(entry => {
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| 58 | streams[match].entries.push(entry)
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| 59 | })
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| 60 | } else {
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| 61 | streams.push(logEntry)
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| 62 | }
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| 63 | }
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| 64 | }
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| 65 | }
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| 66 |
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| 67 | clearBatch () {
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| 68 | this.batch.streams = []
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| 69 | }
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| 70 |
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| 71 | sendBatchToLoki (logEntry) {
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| 72 | return new Promise((resolve, reject) => {
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| 73 | if (this.batch.streams.length === 0 && !logEntry) {
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| 74 | resolve()
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| 75 | } else {
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| 76 | let reqBody
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| 77 | if (this.options.json) {
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| 78 | if (logEntry) {
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| 79 | reqBody = JSON.stringify({ streams: [logEntry] })
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| 80 | } else {
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| 81 | reqBody = JSON.stringify(this.batch)
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| 82 | }
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| 83 | } else {
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| 84 | try {
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| 85 | let batch
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| 86 | if (logEntry) {
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| 87 | batch = { streams: [logEntry] }
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| 88 | } else {
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| 89 | batch = protoHelpers.sortBatch(this.batch)
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| 90 | }
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| 91 | const err = logproto.PushRequest.verify(batch)
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| 92 | if (err) reject(err)
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| 93 | const message = logproto.PushRequest.create(batch)
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| 94 | const buffer = logproto.PushRequest.encode(message).finish()
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| 95 | reqBody = snappy.compressSync(buffer)
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| 96 | } catch (err) {
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| 97 | reject(err)
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| 98 | }
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| 99 | }
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| 100 | got
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| 101 | .post(this.url, {
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| 102 | body: reqBody,
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| 103 | headers: {
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| 104 | 'content-type': this.contentType
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| 105 | }
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| 106 | })
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| 107 | .then(res => {
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| 108 | !logEntry && this.clearBatch()
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| 109 | resolve()
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| 110 | })
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| 111 | .catch(err => {
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| 112 | this.options.clearOnError && this.clearBatch()
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| 113 | reject(err)
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| 114 | })
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| 115 | }
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| 116 | })
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| 117 | }
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| 118 |
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| 119 | async run () {
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| 120 | while (true) {
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| 121 | try {
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| 122 | await this.sendBatchToLoki()
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| 123 | if (this.interval === this.circuitBreakerInterval) {
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| 124 | this.interval = Number(this.options.interval) * 1000
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| 125 | }
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| 126 | } catch (e) {
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| 127 | this.interval = this.circuitBreakerInterval
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| 128 | }
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| 129 | await this.wait(this.interval)
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| 130 | }
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| 131 | }
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| 132 | }
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