postgraphile
Version:
A GraphQL schema created by reflection over a PostgreSQL schema 🐘 (previously known as PostGraphQL)
337 lines • 27.6 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.getPostgraphileSchemaBuilder = void 0;
const pg_1 = require("pg");
const graphql_1 = require("graphql");
const events_1 = require("events");
const postgraphile_core_1 = require("postgraphile-core");
const createPostGraphileHttpRequestHandler_1 = require("./http/createPostGraphileHttpRequestHandler");
const exportPostGraphileSchema_1 = require("./schema/exportPostGraphileSchema");
const pluginHook_1 = require("./pluginHook");
const chalk_1 = require("chalk");
const withPostGraphileContext_1 = require("./withPostGraphileContext");
const shutdownActions_1 = require("./shutdownActions");
const sleep = (ms) => new Promise(resolve => setTimeout(resolve, ms));
// tslint:disable-next-line no-any
function isPlainObject(obj) {
if (!obj || typeof obj !== 'object' || String(obj) !== '[object Object]')
return false;
const proto = Object.getPrototypeOf(obj);
if (proto === null || proto === Object.prototype) {
return true;
}
return false;
}
/**
* Creates a PostGraphile Http request handler by first introspecting the
* database to get a GraphQL schema, and then using that to create the Http
* request handler.
*/
function getPostgraphileSchemaBuilder(pgPool, schema, incomingOptions, shutdownActions = new shutdownActions_1.ShutdownActions()) {
if (incomingOptions.live && incomingOptions.subscriptions == null) {
// live implies subscriptions
incomingOptions.subscriptions = true;
}
const pluginHook = pluginHook_1.pluginHookFromOptions(incomingOptions);
const options = pluginHook('postgraphile:options', incomingOptions, {
pgPool,
schema,
});
// Check for a jwtSecret without a jwtPgTypeIdentifier
// a secret without a token identifier prevents JWT creation
if (options.jwtSecret && !options.jwtPgTypeIdentifier) {
// tslint:disable-next-line no-console
console.warn('WARNING: jwtSecret provided, however jwtPgTypeIdentifier (token identifier) not provided.');
}
if (options.handleErrors && (options.extendedErrors || options.showErrorStack)) {
throw new Error(`You cannot combine 'handleErrors' with the other error options`);
}
// Creates the Postgres schemas array.
const pgSchemas = Array.isArray(schema) ? schema : [schema];
const _emitter = options['_emitter'] || new events_1.EventEmitter();
// Creates a promise which will resolve to a GraphQL schema. Connects a
// client from our pool to introspect the database.
//
// This is not a constant because when we are in watch mode, we want to swap
// out the `gqlSchema`.
let gqlSchema;
const gqlSchemaPromise = createGqlSchema();
return {
_emitter,
getGraphQLSchema: () => (gqlSchema ? Promise.resolve(gqlSchema) : gqlSchemaPromise),
options,
};
async function createGqlSchema() {
let attempts = 0;
let isShuttingDown = false;
shutdownActions.add(async () => {
isShuttingDown = true;
});
/*
* This function should be called after every `await` in the try{} block
* below so that if a shutdown occurs whilst we're awaiting something else
* we immediately clean up.
*/
const assertAlive = () => {
if (isShuttingDown) {
throw Object.assign(new Error('PostGraphile is shutting down'), { isShutdownAction: true });
}
};
// If we're in watch mode, cancel watch mode on shutdown
let releaseWatchFnPromise = null;
shutdownActions.add(async () => {
if (releaseWatchFnPromise) {
try {
const releaseWatchFn = await releaseWatchFnPromise;
await releaseWatchFn();
}
catch (e) {
// Ignore errors during shutdown.
}
}
});
// If the server shuts down, make sure the schema has resolved or
// rejected before signaling shutdown is complete. If it rejected,
// don't propagate the error.
let gqlSchemaPromise = null;
shutdownActions.add(async () => {
if (gqlSchemaPromise) {
await gqlSchemaPromise.catch(() => null);
}
});
// eslint-disable-next-line no-constant-condition
while (true) {
assertAlive();
try {
if (options.watchPg) {
// We must register the value used by the shutdown action immediately to avoid a race condition.
releaseWatchFnPromise = postgraphile_core_1.watchPostGraphileSchema(pgPool, pgSchemas, options, newSchema => {
gqlSchema = newSchema;
_emitter.emit('schemas:changed');
exportGqlSchema(gqlSchema);
});
// Wait for the watch to be set up before progressing.
await releaseWatchFnPromise;
assertAlive();
if (!gqlSchema) {
throw new Error("Consistency error: watchPostGraphileSchema promises to call the callback before the promise resolves; but this hasn't happened");
}
}
else {
// We must register the value used by the shutdown action immediately to avoid a race condition.
gqlSchemaPromise = postgraphile_core_1.createPostGraphileSchema(pgPool, pgSchemas, options);
gqlSchema = await gqlSchemaPromise;
assertAlive();
exportGqlSchema(gqlSchema);
}
if (attempts > 0) {
// tslint:disable-next-line no-console
console.error(`Schema ${attempts > 15 ? 'eventually' : attempts > 5 ? 'finally' : 'now'} generated successfully`);
}
return gqlSchema;
}
catch (error) {
releaseWatchFnPromise = null;
gqlSchemaPromise = null;
attempts++;
const delay = Math.min(100 * Math.pow(attempts, 2), 30000);
if (error.isShutdownAction) {
throw error;
}
else if (isShuttingDown) {
console.error('An error occurred whilst building the schema. However, the server was shutting down, which might have caused it.');
console.error(error);
throw error;
}
else if (typeof options.retryOnInitFail === 'function') {
try {
const start = process.hrtime();
const retry = await options.retryOnInitFail(error, attempts);
const diff = process.hrtime(start);
const dur = diff[0] * 1e3 + diff[1] * 1e-6;
if (isShuttingDown) {
throw error;
}
else if (!retry) {
// Trigger a shutdown, and swallow any new errors so old error is still thrown
await shutdownActions.invokeAll().catch(e => {
console.error('An additional error occured whilst calling shutdownActions.invokeAll():');
console.error(e);
});
throw error;
}
else {
if (dur < 50) {
// retryOnInitFail didn't wait long enough; use default wait.
console.error(`Your retryOnInitFail function should include a delay before resolving; falling back to a ${delay}ms wait (attempts = ${attempts}) to avoid overwhelming the database.`);
await sleep(delay);
}
}
}
catch (e) {
throw Object.defineProperties(new graphql_1.GraphQLError('Failed to initialize GraphQL schema.', undefined, undefined, undefined, undefined, e), {
status: {
value: 503,
enumerable: false,
},
});
}
}
else {
const exitOnFail = !options.retryOnInitFail;
// If we fail to build our schema, log the error and either exit or retry shortly
logSeriousError(error, 'building the initial schema' + (attempts > 1 ? ` (attempt ${attempts})` : ''), exitOnFail
? 'Exiting because `retryOnInitFail` is not set.'
: `We'll try again in ${delay}ms.`);
if (exitOnFail) {
process.exit(34);
}
// Retry shortly
await sleep(delay);
}
}
}
}
async function exportGqlSchema(newGqlSchema) {
try {
await exportPostGraphileSchema_1.default(newGqlSchema, options);
}
catch (error) {
// If we exit cleanly; let calling scripts know there was a problem.
process.exitCode = 35;
// If we fail to export our schema, log the error.
logSeriousError(error, 'exporting the schema');
}
}
}
exports.getPostgraphileSchemaBuilder = getPostgraphileSchemaBuilder;
function postgraphile(poolOrConfig, schemaOrOptions, maybeOptions) {
let schema;
// These are the raw options we're passed in; getPostgraphileSchemaBuilder
// must process them with `pluginHook` before we can rely on them.
let incomingOptions;
// If the second argument is a string or array, it is the schemas so set the
// `schema` value and try to use the third argument (or a default) for
// `incomingOptions`.
if (typeof schemaOrOptions === 'string' || Array.isArray(schemaOrOptions)) {
schema = schemaOrOptions;
incomingOptions = maybeOptions || {};
}
// If the second argument is null or an object then use default `schema`
// and set incomingOptions to second or third argument (or default).
else if (typeof schemaOrOptions === 'object') {
schema = 'public';
incomingOptions = schemaOrOptions || maybeOptions || {};
}
// Otherwise if the second argument is present it's invalid: throw an error.
else if (arguments.length > 1) {
throw new Error('The second argument to postgraphile was invalid... did you mean to set a schema?');
}
// No schema or options specified, use defaults.
else {
schema = 'public';
incomingOptions = {};
}
if (typeof poolOrConfig === 'undefined' && arguments.length >= 1) {
throw new Error('The first argument to postgraphile was `undefined`... did you mean to set pool options?');
}
const shutdownActions = new shutdownActions_1.ShutdownActions();
// Do some things with `poolOrConfig` so that in the end, we actually get a
// Postgres pool.
const { pgPool, releasePgPool } = toPgPool(poolOrConfig);
if (releasePgPool) {
shutdownActions.add(releasePgPool);
}
pgPool.on('error', err => {
/*
* This handler is required so that client connection errors don't bring
* the server down (via `unhandledError`).
*
* `pg` will automatically terminate the client and remove it from the
* pool, so we don't actually need to take any action here, just ensure
* that the event listener is registered.
*/
// tslint:disable-next-line no-console
console.error('PostgreSQL client generated error: ', err.message);
});
pgPool.on('connect', pgClient => {
// Enhance our Postgres client with debugging stuffs.
withPostGraphileContext_1.debugPgClient(pgClient, !!options.allowExplain);
});
const { getGraphQLSchema, options, _emitter } = getPostgraphileSchemaBuilder(pgPool, schema, incomingOptions, shutdownActions);
return createPostGraphileHttpRequestHandler_1.default({
...(typeof poolOrConfig === 'string' ? { ownerConnectionString: poolOrConfig } : {}),
...options,
getGqlSchema: getGraphQLSchema,
pgPool,
_emitter,
shutdownActions,
});
}
exports.default = postgraphile;
function logSeriousError(error, when, nextSteps) {
// tslint:disable-next-line no-console
console.error(`A ${chalk_1.default.bold('serious error')} occurred when ${chalk_1.default.bold(when)}. ${nextSteps ? nextSteps + ' ' : ''}Error details:\n\n${error.stack}\n`);
}
function hasPoolConstructor(obj) {
return (
// tslint:disable-next-line no-any
(obj && typeof obj.constructor === 'function' && obj.constructor === pg_1.Pool.super_) ||
false);
}
function constructorName(obj) {
return ((obj &&
typeof obj.constructor === 'function' &&
obj.constructor.name &&
String(obj.constructor.name)) ||
null);
}
// tslint:disable-next-line no-any
function toPgPool(poolOrConfig) {
if (quacksLikePgPool(poolOrConfig)) {
// If it is already a `Pool`, just use it.
return { pgPool: poolOrConfig, releasePgPool: null };
}
if (typeof poolOrConfig === 'string') {
// If it is a string, let us parse it to get a config to create a `Pool`.
const pgPool = new pg_1.Pool({ connectionString: poolOrConfig });
return { pgPool, releasePgPool: () => pgPool.end() };
}
else if (!poolOrConfig) {
// Use an empty config and let the defaults take over.
const pgPool = new pg_1.Pool({});
return { pgPool, releasePgPool: () => pgPool.end() };
}
else if (isPlainObject(poolOrConfig)) {
// The user handed over a configuration object, pass it through
const pgPool = new pg_1.Pool(poolOrConfig);
return { pgPool, releasePgPool: () => pgPool.end() };
}
else {
throw new Error('Invalid connection string / Pool ');
}
}
// tslint:disable-next-line no-any
function quacksLikePgPool(pgConfig) {
if (pgConfig instanceof pg_1.Pool)
return true;
if (hasPoolConstructor(pgConfig))
return true;
// A diagnosis of exclusion
if (!pgConfig || typeof pgConfig !== 'object')
return false;
if (constructorName(pgConfig) !== 'Pool' && constructorName(pgConfig) !== 'BoundPool')
return false;
if (!pgConfig['Client'])
return false;
if (!pgConfig['options'])
return false;
if (typeof pgConfig['connect'] !== 'function')
return false;
if (typeof pgConfig['end'] !== 'function')
return false;
if (typeof pgConfig['query'] !== 'function')
return false;
return true;
}
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