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Merge pull request #6718 from TheThingsNetwork/fix/rollback-http-stream
console: Rollback old http stream
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,145 @@ | ||
| // Copyright © 2019 The Things Network Foundation, The Things Industries B.V. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
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| import ArrayBufferToString from 'arraybuffer-to-string' | ||
|
|
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| import Token from '../../util/token' | ||
|
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| import { notify, EVENTS } from './shared' | ||
| import 'web-streams-polyfill/dist/polyfill' | ||
|
|
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| /** | ||
| * Opens a new stream. | ||
| * | ||
| * @async | ||
| * @param {object} payload - - The body of the initial request. | ||
| * @param {string} url - The stream endpoint. | ||
| * | ||
| * @example | ||
| * (async () => { | ||
| * const stream = await stream( | ||
| * { identifiers: [{ application_ids: { application_id: 'my-app' }}]}, | ||
| * '/api/v3/events', | ||
| * ) | ||
| * | ||
| * // Add listeners to the stream. | ||
| * stream | ||
| * .on('start', () => console.log('conn opened')) | ||
| * .on('message', message => console.log('received message', message)) | ||
| * .on('error', error => console.log(error)) | ||
| * .on('close', wasClientRequest => console.log(wasClientRequest ? 'conn closed by client' : 'conn closed by server')) | ||
| * | ||
| * // Start the stream after attaching listerners. | ||
| * stream.open() | ||
| * | ||
| * // Close the stream after 20 s. | ||
| * setTimeout(() => stream.close(), 20000) | ||
| * })() | ||
| * | ||
| * @returns {object} The stream subscription object with the `on` function for | ||
| * attaching listeners and the `close` function to close the stream. | ||
| */ | ||
| export default async (payload, url) => { | ||
| const initialListeners = Object.values(EVENTS).reduce( | ||
| (acc, curr) => ({ ...acc, [curr]: null }), | ||
| {}, | ||
| ) | ||
| let listeners = initialListeners | ||
| let closeRequested = false | ||
| const token = new Token().get() | ||
|
|
||
| let Authorization = null | ||
| if (typeof token === 'function') { | ||
| Authorization = `Bearer ${(await token()).access_token}` | ||
| } else { | ||
| Authorization = `Bearer ${token}` | ||
| } | ||
|
|
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| const abortController = new AbortController() | ||
| const response = await fetch(url, { | ||
| body: JSON.stringify(payload), | ||
| method: 'POST', | ||
| signal: abortController.signal, | ||
| headers: { | ||
| Authorization, | ||
| Accept: 'text/event-stream', | ||
| }, | ||
| }) | ||
|
|
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| if (response.status !== 200) { | ||
| const err = await response.json() | ||
|
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| throw 'error' in err ? err.error : err | ||
| } | ||
|
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| let buffer = '' | ||
| const reader = response.body.getReader() | ||
| const onMessage = ({ done, value }) => { | ||
| if (done) { | ||
| notify(listeners[EVENTS.CLOSE], closeRequested) | ||
| listeners = initialListeners | ||
| return | ||
| } | ||
|
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| const parsed = ArrayBufferToString(value) | ||
| buffer += parsed | ||
| const lines = buffer.split(/\n\n/) | ||
| buffer = lines.pop() | ||
| for (const line of lines) { | ||
| notify(listeners[EVENTS.MESSAGE], JSON.parse(line).result) | ||
| } | ||
|
|
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| return reader.read().then(onMessage) | ||
| } | ||
|
|
||
| return { | ||
| open: () => { | ||
| reader | ||
| .read() | ||
| .then(data => { | ||
| notify(listeners[EVENTS.START]) | ||
|
|
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| return data | ||
| }) | ||
| .then(onMessage) | ||
| .catch(error => { | ||
| notify(listeners[EVENTS.ERROR], error) | ||
| listeners = initialListeners | ||
| }) | ||
| }, | ||
| on(eventName, callback) { | ||
| if (listeners[eventName] === undefined) { | ||
| throw new Error( | ||
| `${eventName} event is not supported. Should be one of: start, error, message or close`, | ||
| ) | ||
| } | ||
|
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| listeners[eventName] = callback | ||
|
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| return this | ||
| }, | ||
| close: () => { | ||
| closeRequested = true | ||
|
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| reader | ||
| .cancel() | ||
| .then(() => { | ||
| abortController.abort() | ||
| }) | ||
| .catch(error => { | ||
| notify(listeners[EVENTS.ERROR], error) | ||
| }) | ||
| }, | ||
| } | ||
| } |
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