@graphql-tools/executor-envelop/esm/index.js

A set of utils for faster development of GraphQL tools

import { isPromise } from '@graphql-tools/utils';
import { schemaFromExecutor } from '@graphql-tools/wrap';
export function useExecutor(executor, opts) {
    const EMPTY_ARRAY = Object.freeze([]);
    function executorToExecuteFn(executionArgs) {
        return executor({
            document: executionArgs.document,
            rootValue: executionArgs.rootValue,
            context: executionArgs.contextValue,
            variables: executionArgs.variableValues,
            operationName: executionArgs.operationName,
        });
    }
    const pluginCtx = {
        schema$: undefined,
        schema: undefined,
        schemaSetPromise$: undefined,
        skipIntrospection: false,
    };
    if (opts?.polling) {
        setInterval(() => {
            pluginCtx.schema$ = undefined;
            pluginCtx.schema = undefined;
        }, opts.polling);
    }
    function ensureSchema(ctx) {
        if (pluginCtx.skipIntrospection) {
            return;
        }
        try {
            if (!pluginCtx.schema && !pluginCtx.schemaSetPromise$) {
                pluginCtx.schema$ ||= schemaFromExecutor(executor, ctx, opts);
                if (isPromise(pluginCtx.schema$)) {
                    pluginCtx.schemaSetPromise$ = pluginCtx.schema$.then(newSchema => {
                        pluginCtx.schema = newSchema;
                    }).catch?.(err => {
                        console.warn(`Introspection failed, skipping introspection due to the following errors;\n`, err);
                        pluginCtx.skipIntrospection = true;
                    });
                }
                else {
                    pluginCtx.schema = pluginCtx.schema$;
                }
            }
        }
        catch (err) {
            pluginCtx.skipIntrospection = true;
            console.warn(`Introspection failed, skipping introspection due to the following errors;\n`, err);
        }
    }
    return {
        onEnveloped({ context, setSchema }) {
            ensureSchema(context);
            if (pluginCtx.schema) {
                setSchema(pluginCtx.schema);
            }
        },
        onContextBuilding() {
            ensureSchema();
            if (pluginCtx.schemaSetPromise$) {
                return pluginCtx.schemaSetPromise$;
            }
        },
        onExecute({ args, setExecuteFn }) {
            if (args.schema) {
                pluginCtx.schema = args.schema;
                pluginCtx.schema$ = pluginCtx.schema;
            }
            ensureSchema(args.contextValue);
            if (isPromise(pluginCtx.schemaSetPromise$)) {
                return pluginCtx.schemaSetPromise$.then(() => {
                    setExecuteFn(executorToExecuteFn);
                });
            }
            setExecuteFn(executorToExecuteFn);
        },
        onSubscribe({ args, setSubscribeFn }) {
            if (args.schema) {
                pluginCtx.schema = args.schema;
                pluginCtx.schema$ = pluginCtx.schema;
            }
            ensureSchema(args.contextValue);
            if (isPromise(pluginCtx.schemaSetPromise$)) {
                return pluginCtx.schemaSetPromise$.then(() => {
                    setSubscribeFn(executorToExecuteFn);
                });
            }
            setSubscribeFn(executorToExecuteFn);
        },
        onValidate({ params, context, setResult }) {
            if (params.schema) {
                pluginCtx.schema = params.schema;
                pluginCtx.schema$ = pluginCtx.schema;
            }
            ensureSchema(context);
            if (pluginCtx.schema?.[Symbol.toStringTag] !== 'GraphQLSchema') {
                setResult(EMPTY_ARRAY);
            }
        },
        pluginCtx,
        ensureSchema,
        invalidateUnifiedGraph() {
            pluginCtx.schema$ = undefined;
            pluginCtx.schema = undefined;
            pluginCtx.skipIntrospection = false;
        },
    };
}