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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| /* eslint-disable no-restricted-syntax,semi,comma-dangle,class-methods-use-this */ | ||
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|
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| const { AttachmentProcessor } = require('@elastic.io/component-commons-library') | ||
| const { Writable } = require('stream'); | ||
| const { messages } = require('elasticio-node') | ||
| const stream = require('stream') | ||
| const util = require('util') | ||
| const papa = require('papaparse') | ||
| const { getUserAgent } = require('../util'); | ||
|
|
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| const pipeline = util.promisify(stream.pipeline); | ||
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| // transform array to obj, for example: | ||
| // ['aa', 'bb', 'cc'] => {column0: 'aa', column1: 'bb', column2: 'cc'} | ||
| function arrayToObj(arr) { | ||
| let columns = {} | ||
| arr.forEach((value, index) => { | ||
| columns = { ...columns, ...{ [`column${index}`]: value } } | ||
| }) | ||
| return columns | ||
| } | ||
|
|
||
| async function readCSV(msg, cfg) { | ||
| const that = this; | ||
| const { | ||
| url, | ||
| header, | ||
| delimiter, | ||
| dynamicTyping, | ||
| emitBehavior, | ||
| batchSize, | ||
| skipEmptyLines, | ||
| comments | ||
| } = cfg; | ||
|
|
||
| if (emitBehavior === 'emitBatch') { | ||
| if (!isPositiveInteger(parseInt(batchSize, 10))) { | ||
| throw new Error("'batchSize' must be a positive integer!"); | ||
| } | ||
| } | ||
| if (!url) throw new Error('URL of the CSV is missing'); | ||
|
|
||
| const parseOptions = { | ||
| header, | ||
| dynamicTyping, | ||
| delimiter, | ||
| skipEmptyLines, | ||
| comments, | ||
| } | ||
|
|
||
| // if set "Fetch All" create object with results | ||
| const result = []; | ||
|
|
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| let dataStream; | ||
| const parseStream = papa.parse(papa.NODE_STREAM_INPUT, parseOptions); | ||
|
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| const attachmentProcessor = new AttachmentProcessor(getUserAgent(), msg.id); | ||
| try { | ||
| dataStream = await attachmentProcessor.getAttachment(url, 'stream') | ||
| this.logger.info('File received, trying to parse CSV') | ||
| } catch (err) { | ||
| this.logger.error(`URL - "${url}" unreachable: ${err}`); | ||
| await this.emit('error', `URL - "${url}" unreachable: ${err}`); | ||
| return; | ||
| } | ||
|
|
||
| const buf = []; | ||
| class CsvWriter extends Writable { | ||
| async write(chunk) { | ||
| let data = {} | ||
| if (parseOptions.header) { | ||
| data = chunk | ||
| } else { | ||
| data = arrayToObj(chunk) | ||
| } | ||
| if (emitBehavior === 'emitIndividually' || emitBehavior === false || emitBehavior === 'false' || emitBehavior === 'emitBatch') { | ||
| parseStream.pause() | ||
| if (emitBehavior === 'emitBatch') { | ||
| buf.push(data); | ||
| if (buf.length >= batchSize) await that.emit('data', messages.newMessageWithBody({ result: buf.splice(0, batchSize) })) | ||
| } else { | ||
| await that.emit('data', messages.newMessageWithBody(data)) | ||
| } | ||
| parseStream.resume() | ||
| } else { | ||
| result.push(data) | ||
| } | ||
| } | ||
| } | ||
| const writerStream = new CsvWriter(); | ||
| writerStream.logger = this.logger; | ||
|
|
||
| try { | ||
| await pipeline( | ||
| dataStream.data, | ||
| parseStream, | ||
| writerStream | ||
| ) | ||
| this.logger.info('File parsed successfully') | ||
| } catch (err) { | ||
| this.logger.error(`error during file parse: ${err}`); | ||
| await this.emit('error', `error during file parse: ${err}`) | ||
| return; | ||
| } | ||
|
|
||
| if (emitBehavior === 'fetchAll') { | ||
| await this.emit('data', messages.newMessageWithBody({ result })) | ||
| } else if (emitBehavior === 'emitBatch' && buf.length > 0) { | ||
| await that.emit('data', messages.newMessageWithBody({ result: buf })) | ||
| } | ||
| this.logger.info(`Complete, memory used: ${process.memoryUsage().heapUsed / 1024 / 1024} Mb`) | ||
| } | ||
|
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| module.exports.process = readCSV; | ||
|
|
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| function isPositiveInteger(input) { | ||
| return Number.isSafeInteger(input) && input > 0; | ||
| } |
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