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Use LSP-like protocol for prettier wrapper commands

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This commit is contained in:
Kirill Bulatov 2023-09-15 23:10:42 +03:00
parent bb2cc2d157
commit 010bb73ac2
1 changed files with 46 additions and 25 deletions
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71
crates/prettier/prettier_server/src/index.js
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@ -44,7 +44,6 @@ async function handleBuffer(prettier) {
}
async function* readStdin() {
const bufferLengthOffset = 4;
let buffer = Buffer.alloc(0);
let streamEnded = false;
process.stdin.on('end', () => {
@ -54,41 +53,63 @@ async function* readStdin() {
buffer = Buffer.concat([buffer, data]);
});
async function handleStreamEnded(errorMessage) {
sendResponse(makeError(errorMessage));
buffer = Buffer.alloc(0);
messageLength = null;
await once(process.stdin, 'readable');
streamEnded = false;
}
try {
const headersSeparator = "\r\n\r\n";
let contentLengthHeaderName = 'Content-Length';
let headersLength = null;
let messageLength = null;
main_loop: while (true) {
while (buffer.length < bufferLengthOffset) {
if (streamEnded) {
sendResponse(makeError(`Unexpected end of stream: less than ${bufferLengthOffset} characters passed`));
buffer = Buffer.alloc(0);
streamEnded = false;
if (messageLength === null) {
while (buffer.indexOf(headersSeparator) === -1) {
if (streamEnded) {
await handleStreamEnded('Unexpected end of stream: headers not found');
continue main_loop;
} else if (buffer.length > contentLengthHeaderName.length * 10) {
await handleStreamEnded(`Unexpected stream of bytes: no headers end found after ${buffer.length} bytes of input`);
continue main_loop;
}
await once(process.stdin, 'readable');
}
const headers = buffer.subarray(0, buffer.indexOf(headersSeparator)).toString('ascii');
const contentLengthHeader = headers.split('\r\n').map(header => header.split(': '))
.filter(header => header[2] === undefined)
.filter(header => (header[1] || '').length > 0)
.find(header => header[0].trim() === contentLengthHeaderName);
if (contentLengthHeader === undefined) {
await handleStreamEnded(`Missing or incorrect Content-Length header: ${headers}`);
continue main_loop;
}
headersLength = headers.length + headersSeparator.length;
messageLength = parseInt(contentLengthHeader[1], 10);
}
while (buffer.length < (headersLength + messageLength)) {
if (streamEnded) {
await handleStreamEnded(
`Unexpected end of stream: buffer length ${buffer.length} does not match expected header length ${headersLength} + body length ${messageLength}`);
continue main_loop;
}
await once(process.stdin, 'readable');
}
const length = buffer.readUInt32LE(0);
while (buffer.length < (bufferLengthOffset + length)) {
if (streamEnded) {
sendResponse(makeError(
`Unexpected end of stream: buffer length ${buffer.length} does not match expected length ${bufferLengthOffset} + ${length}`));
buffer = Buffer.alloc(0);
streamEnded = false;
await once(process.stdin, 'readable');
continue main_loop;
}
await once(process.stdin, 'readable');
}
const message = buffer.subarray(4, 4 + length);
buffer = buffer.subarray(4 + length);
const messageEnd = headersLength + messageLength;
const message = buffer.subarray(headersLength, messageEnd);
buffer = buffer.subarray(messageEnd);
messageLength = null;
yield message.toString('utf8');
}
} catch (e) {
console.error(`Error reading stdin: ${e}`);
} finally {
process.stdin.off('data');
process.stdin.off('data', () => { });
}
}
@ -98,7 +119,6 @@ async function handleData(messageText, prettier) {
await handleMessage(prettier, message);
} catch (e) {
sendResponse(makeError(`Request JSON parse error: ${e}`));
return;
}
}
@ -109,7 +129,8 @@ async function handleData(messageText, prettier) {
// error
async function handleMessage(prettier, message) {
console.log(`message: ${message}`);
// TODO kb handle message.method, message.params and message.id
console.log(`message: ${JSON.stringify(message)}`);
sendResponse({ method: "hi", result: null });
}