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postgraphile

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A GraphQL schema created by reflection over a PostgreSQL schema 🐘 (previously known as PostGraphQL)

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"use strict"; Object.defineProperty(exports, "__esModule", { value: true }); exports.PostGraphileResponseFastify3 = exports.PostGraphileResponseKoa = exports.PostGraphileResponseNode = exports.PostGraphileResponse = void 0; const stream_1 = require("stream"); /** * The base class for PostGraphile responses; collects headers, status code and * body, and then hands to the relevant adaptor at the correct time. */ class PostGraphileResponse { constructor() { this._headers = {}; this._setHeaders = false; this.statusCode = 200; } _setHeadersOnce() { if (!this._setHeaders) { this._setHeaders = true; this.setHeaders(this.statusCode, this._headers); } } setHeader(header, value) { if (this._setHeaders) { throw new Error(`Cannot set a header '${header}' when headers already sent`); } this._headers[header] = value; } /** * Use `endWithStream` or `end`; not both. */ endWithStream() { if (this._body != null) { throw new Error("Cannot return a stream when there's already a response body"); } this._setHeadersOnce(); this._body = new stream_1.PassThrough(); this.setBody(this._body); return this._body; } /** * Use `endWithStream` or `end`; not both */ end(moreBody) { if (moreBody) { if (this._body != null) { if (typeof this._body === 'string') { if (Buffer.isBuffer(moreBody)) { throw new Error('Cannot mix string and buffer'); } this._body = this._body + moreBody; } else if (Buffer.isBuffer(this._body)) { if (typeof moreBody === 'string') { throw new Error('Cannot mix buffer and string'); } this._body = Buffer.concat([this._body, moreBody]); } else { throw new Error("Can't `.end(string)` when body is a stream"); } } else { this._body = moreBody; } } // If possible, set Content-Length to avoid unnecessary chunked encoding if (typeof this._body === 'string') { // String length is not reliable due to multi-byte characters; calculate via Buffer this.setHeader('Content-Length', String(Buffer.byteLength(this._body, 'utf8'))); } else if (Buffer.isBuffer(this._body)) { this.setHeader('Content-Length', String(this._body.byteLength)); } this._setHeadersOnce(); this.setBody(this._body); } } exports.PostGraphileResponse = PostGraphileResponse; /** * Suitable for Node's HTTP server, but also connect, express, restify and fastify v2. */ class PostGraphileResponseNode extends PostGraphileResponse { constructor(req, res, next) { super(); this._req = req; this._res = res; this._next = next; } getNodeServerRequest() { return this._req; } getNodeServerResponse() { return this._res; } getNextCallback() { return this._next; } setHeaders(statusCode, headers) { for (const key in headers) { if (Object.hasOwnProperty.call(headers, key)) { this._res.setHeader(key, headers[key]); } } this._res.statusCode = statusCode; } setBody(body) { if (typeof body === 'string') { this._res.end(body); } else if (Buffer.isBuffer(body)) { this._res.end(body); } else if (!body) { this._res.end(); } else { // Must be a stream // It'd be really nice if we could just: // // body.pipe(this._res); // // however we need to support running within the compression middleware // which requires special handling for server-sent events: // https://github.com/expressjs/compression#server-sent-events // // Because of this, we must handle the data streaming manually so we can // flush: const writeData = (data) => { this._res.write(data); // Technically we should see if `.write()` returned false, and if so we // should pause the stream. However, since our stream is coming from // watch mode, we find it unlikely that a significant amount of data // will be buffered (and we don't recommend watch mode in production), // so it doesn't feel like we need this currently. If it turns out you // need this, a PR would be welcome. if (typeof this._res.flush === 'function') { // https://github.com/expressjs/compression#server-sent-events this._res.flush(); } else if (typeof this._res.flushHeaders === 'function') { this._res.flushHeaders(); } }; let clean = false; const cleanup = () => { if (clean) return; clean = true; body.removeListener('data', writeData); body.removeListener('end', cleanup); this._req.removeListener('close', cleanup); this._req.removeListener('end', cleanup); this._req.removeListener('error', cleanup); }; body.on('data', writeData); body.on('end', () => { cleanup(); this._res.end(); }); this._req.on('close', cleanup); this._req.on('end', cleanup); this._req.on('error', cleanup); } } } exports.PostGraphileResponseNode = PostGraphileResponseNode; /** * Suitable for Koa. */ class PostGraphileResponseKoa extends PostGraphileResponse { constructor(ctx, next) { super(); this._ctx = ctx; this._next = next; const req = this.getNodeServerRequest(); // For backwards compatibility, and to allow getting "back" to the Koa // context from pgSettings, etc (this is a documented interface) req._koaCtx = ctx; // Make `koa-bodyparser` trigger skipping of our `body-parser` if (ctx.request.body) { req._body = true; req.body = ctx.request.body; } // In case you're using koa-mount or similar req.originalUrl = ctx.request.originalUrl; } getNodeServerRequest() { return this._ctx.req; } getNodeServerResponse() { return this._ctx.res; } getNextCallback() { return this._next; } setHeaders(statusCode, headers) { this._ctx.status = statusCode; this._ctx.set(headers); // DO NOT `this._ctx.flushHeaders()` as it will interfere with the compress // middleware. } endWithStream() { // We're going to assume this is the EventStream which we want to // be realtime for watch mode, and there's no value in compressing it. this._ctx.compress = false; // TODO: find a better way of flushing the event stream on write. return super.endWithStream(); } setBody(body) { this._ctx.body = body || ''; this._next(); } } exports.PostGraphileResponseKoa = PostGraphileResponseKoa; /** * Suitable for Fastify v3 (use PostGraphileResponseNode and middleware * approach for Fastify v2) */ class PostGraphileResponseFastify3 extends PostGraphileResponse { constructor(request, reply) { super(); this._request = request; this._reply = reply; // For backwards compatibility, and to allow getting "back" to the Fastify // request from pgSettings, etc const req = this.getNodeServerRequest(); req._fastifyRequest = this._request; // Make Fastify's body parsing trigger skipping of our `body-parser` if (this._request.body) { req._body = true; req.body = this._request.body; } } getNodeServerRequest() { return this._request.raw; } getNodeServerResponse() { return this._reply.raw; } setHeaders(statusCode, headers) { this._reply.status(statusCode); this._reply.headers(headers); } endWithStream() { // We're going to assume this is the EventStream which we want to // be realtime for watch mode, and there's no value in compressing it. // Fastify will disable compression if we set the relevant request header // (see: // https://github.com/fastify/fastify-compress/blob/068c673fc0bd50da1f4d9f3fd2423b482c364a89/index.js#L217-L218) this._request.headers['x-no-compression'] = '1'; // TODO: find a better way of flushing the event stream on write. return super.endWithStream(); } setBody(body) { this._reply.send(body); } } exports.PostGraphileResponseFastify3 = PostGraphileResponseFastify3; //# 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