postgraphile
Version:
A GraphQL schema created by reflection over a PostgreSQL schema 🐘 (previously known as PostGraphQL)
258 lines • 18 kB
JavaScript
"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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