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Add compat support for old clients (#2)
Signed-off-by: Marcos Candeia <[email protected]>
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| {} |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| import type { Message, MessageSerializer } from "./channel.ts"; | ||
| import { ensureChunked } from "./server.ts"; | ||
|
|
||
| export const jsonSerializer = <TSend, TReceive>(): MessageSerializer< | ||
| TSend, | ||
| TReceive, | ||
| string | ||
| > => { | ||
| return { | ||
| deserialize: (msg) => { | ||
| const parsed = JSON.parse(msg); | ||
| if (!("chunk" in parsed)) { | ||
| return parsed; | ||
| } | ||
| const { chunk, ...rest } = parsed; | ||
| return { | ||
| chunk: ensureChunked(chunk), | ||
| ...rest, | ||
| }; | ||
| }, | ||
| serialize: JSON.stringify, | ||
| }; | ||
| }; | ||
|
|
||
| // Function to combine metadata and binary data | ||
| function createMessage( | ||
| metadata: unknown, | ||
| uint8Array?: Uint8Array, | ||
| ): ArrayBuffer { | ||
| const metadataString = JSON.stringify(metadata); | ||
| const metadataUint8Array = new TextEncoder().encode(metadataString); | ||
|
|
||
| // Create a buffer to hold the metadata length, metadata, and binary data | ||
| const buffer = new ArrayBuffer( | ||
| 4 + metadataUint8Array.length + (uint8Array?.length ?? 0), | ||
| ); | ||
| const view = new DataView(buffer); | ||
|
|
||
| // Write the metadata length (4 bytes) | ||
| view.setUint32(0, metadataUint8Array.length, true); | ||
|
|
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| // Write the metadata | ||
| new Uint8Array(buffer, 4, metadataUint8Array.length).set(metadataUint8Array); | ||
|
|
||
| // Write the binary data | ||
| uint8Array && | ||
| new Uint8Array(buffer, 4 + metadataUint8Array.length).set(uint8Array); | ||
|
|
||
| return buffer; | ||
| } | ||
|
|
||
| function parseMessage( | ||
| buffer: ArrayBuffer, | ||
| // deno-lint-ignore no-explicit-any | ||
| ): { metadata: any; binaryData: Uint8Array } { | ||
| const view = new DataView(buffer); | ||
|
|
||
| // Read the metadata length (4 bytes) | ||
| const metadataLength = view.getUint32(0, true); | ||
|
|
||
| // Read the metadata | ||
| const metadataUint8Array = new Uint8Array(buffer, 4, metadataLength); | ||
| const metadataString = new TextDecoder().decode(metadataUint8Array); | ||
| const metadata = JSON.parse(metadataString); | ||
|
|
||
| // Read the binary data | ||
| const binaryData = new Uint8Array(buffer, 4 + metadataLength); | ||
|
|
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| return { metadata, binaryData }; | ||
| } | ||
|
|
||
| export const arrayBufferSerializer = (): MessageSerializer< | ||
| ArrayBuffer, | ||
| ArrayBuffer, | ||
| ArrayBuffer | ||
| > => { | ||
| return { | ||
| binaryType: "arraybuffer", | ||
| serialize: (msg) => msg, | ||
| deserialize: (msg) => msg, | ||
| }; | ||
| }; | ||
|
|
||
| export const dataViewerSerializer = < | ||
| TSend, | ||
| TReceive, | ||
| >(): MessageSerializer< | ||
| TSend, | ||
| TReceive, | ||
| ArrayBuffer | ||
| > => { | ||
| return { | ||
| binaryType: "arraybuffer", | ||
| serialize: ({ chunk, ...rest }: Message<TSend>) => { | ||
| return createMessage(rest, chunk); | ||
| }, | ||
| deserialize: (buffer: ArrayBuffer) => { | ||
| const parsed = parseMessage(buffer); | ||
| return { | ||
| ...parsed.metadata, | ||
| chunk: parsed.binaryData, | ||
| }; | ||
| }, | ||
| }; | ||
| }; |
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