110 lines
2.3 KiB
Plaintext
110 lines
2.3 KiB
Plaintext
[[as_stream_examples]]
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=== asStream
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Instead of getting the parsed body back, you will get the raw Node.js stream of
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data.
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[source,js]
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----
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'use strict'
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const { Client } = require('@elastic/elasticsearch')
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const client = new Client({
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cloud: { id: '<cloud-id>' },
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auth: { apiKey: 'base64EncodedKey' }
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})
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async function run () {
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const bulkResponse = await client.bulk({
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refresh: true,
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operations: [
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// operation to perform
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{ index: { _index: 'game-of-thrones' } },
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// the document to index
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{
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character: 'Ned Stark',
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quote: 'Winter is coming.'
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},
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{ index: { _index: 'game-of-thrones' } },
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{
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character: 'Daenerys Targaryen',
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quote: 'I am the blood of the dragon.'
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},
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{ index: { _index: 'game-of-thrones' } },
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{
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character: 'Tyrion Lannister',
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quote: 'A mind needs books like a sword needs a whetstone.'
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}
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]
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})
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if (bulkResponse.errors) {
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console.log(bulkResponse)
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process.exit(1)
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}
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// Let's search!
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const result = await client.search({
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index: 'game-of-thrones',
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query: {
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match: {
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quote: 'winter'
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}
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}
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}, {
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asStream: true
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})
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// stream async iteration, available in Node.js ≥ 10
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let payload = ''
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body.setEncoding('utf8')
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for await (const chunk of result) {
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payload += chunk
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}
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console.log(JSON.parse(payload))
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// classic stream callback style
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let payload = ''
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result.setEncoding('utf8')
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result.on('data', chunk => { payload += chunk })
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result.on('error', console.log)
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result.on('end', () => {
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console.log(JSON.parse(payload))
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})
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}
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run().catch(console.log)
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----
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TIP: This can be useful if you need to pipe the {es}'s response to a proxy, or
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send it directly to another source.
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[source,js]
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----
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'use strict'
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const { Client } = require('@elastic/elasticsearch')
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const client = new Client({
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cloud: { id: '<cloud-id>' },
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auth: { apiKey: 'base64EncodedKey' }
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})
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const fastify = require('fastify')()
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fastify.post('/search/:index', async (req, reply) => {
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const { body, statusCode, headers } = await client.search({
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index: req.params.index,
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...req.body
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}, {
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asStream: true,
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meta: true
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})
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reply.code(statusCode).headers(headers)
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return body
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})
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fastify.listen(3000)
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----
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