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[Flight] Split Streaming from Relay Implemenation (#18260)
* Add ReactFlightServerConfig intermediate This just forwards to the stream version of Flight which is itself forked between Node and W3C streams. The dom-relay goes directly to the Relay config though which allows it to avoid the stream part of Flight. * Separate streaming protocol into the Stream config * Split streaming parts into the ReactFlightServerConfigStream This decouples it so that the Relay implementation doesn't have to encode the JSON to strings. Instead it can be fed the values as JSON objects and do its own encoding. * Split FlightClient into a basic part and a stream part Same split as the server. * Expose lower level async hooks to Relay This requires an external helper file that we'll wire up internally.
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| * @flow | ||
| */ | ||
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| export * from './src/ReactFlightClient'; | ||
| export * from './src/ReactFlightClientStream'; | ||
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| @@ -0,0 +1,116 @@ | ||
| /** | ||
| * Copyright (c) Facebook, Inc. and its affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| * | ||
| * @flow | ||
| */ | ||
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| import type {Response as ResponseBase, JSONValue} from './ReactFlightClient'; | ||
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| import type {StringDecoder} from './ReactFlightClientHostConfig'; | ||
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| import { | ||
| createResponse as createResponseImpl, | ||
| resolveModelChunk, | ||
| resolveErrorChunk, | ||
| parseModelFromJSON, | ||
| } from './ReactFlightClient'; | ||
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| import { | ||
| supportsBinaryStreams, | ||
| createStringDecoder, | ||
| readPartialStringChunk, | ||
| readFinalStringChunk, | ||
| } from './ReactFlightClientHostConfig'; | ||
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| export type ReactModelRoot<T> = {| | ||
| model: T, | ||
| |}; | ||
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| type Response = ResponseBase & { | ||
| fromJSON: (key: string, value: JSONValue) => any, | ||
| stringDecoder: StringDecoder, | ||
| }; | ||
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| export function createResponse(): Response { | ||
| let response: Response = (createResponseImpl(): any); | ||
| response.fromJSON = function(key: string, value: JSONValue) { | ||
| return parseModelFromJSON(response, this, key, value); | ||
| }; | ||
| if (supportsBinaryStreams) { | ||
| response.stringDecoder = createStringDecoder(); | ||
| } | ||
| return response; | ||
| } | ||
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| function processFullRow(response: Response, row: string): void { | ||
| if (row === '') { | ||
| return; | ||
| } | ||
| let tag = row[0]; | ||
| switch (tag) { | ||
| case 'J': { | ||
| let colon = row.indexOf(':', 1); | ||
| let id = parseInt(row.substring(1, colon), 16); | ||
| let json = row.substring(colon + 1); | ||
| let model = JSON.parse(json, response.fromJSON); | ||
| resolveModelChunk(response, id, model); | ||
| return; | ||
| } | ||
| case 'E': { | ||
| let colon = row.indexOf(':', 1); | ||
| let id = parseInt(row.substring(1, colon), 16); | ||
| let json = row.substring(colon + 1); | ||
| let errorInfo = JSON.parse(json); | ||
| resolveErrorChunk(response, id, errorInfo.message, errorInfo.stack); | ||
| return; | ||
| } | ||
| default: { | ||
| // Assume this is the root model. | ||
| let model = JSON.parse(row, response.fromJSON); | ||
| resolveModelChunk(response, 0, model); | ||
| return; | ||
| } | ||
| } | ||
| } | ||
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| export function processStringChunk( | ||
| response: Response, | ||
| chunk: string, | ||
| offset: number, | ||
| ): void { | ||
| let linebreak = chunk.indexOf('\n', offset); | ||
| while (linebreak > -1) { | ||
| let fullrow = response.partialRow + chunk.substring(offset, linebreak); | ||
| processFullRow(response, fullrow); | ||
| response.partialRow = ''; | ||
| offset = linebreak + 1; | ||
| linebreak = chunk.indexOf('\n', offset); | ||
| } | ||
| response.partialRow += chunk.substring(offset); | ||
| } | ||
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| export function processBinaryChunk( | ||
| response: Response, | ||
| chunk: Uint8Array, | ||
| ): void { | ||
| if (!supportsBinaryStreams) { | ||
| throw new Error("This environment don't support binary chunks."); | ||
| } | ||
| let stringDecoder = response.stringDecoder; | ||
| let linebreak = chunk.indexOf(10); // newline | ||
| while (linebreak > -1) { | ||
| let fullrow = | ||
| response.partialRow + | ||
| readFinalStringChunk(stringDecoder, chunk.subarray(0, linebreak)); | ||
| processFullRow(response, fullrow); | ||
| response.partialRow = ''; | ||
| chunk = chunk.subarray(linebreak + 1); | ||
| linebreak = chunk.indexOf(10); // newline | ||
| } | ||
| response.partialRow += readPartialStringChunk(stringDecoder, chunk); | ||
| } | ||
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| export {reportGlobalError, close, getModelRoot} from './ReactFlightClient'; |
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