@graphql-mesh/graphql/index.esm.js

import { fetchache, Request } from 'fetchache';
import { UrlLoader } from '@graphql-tools/url-loader';
import { buildClientSchema, introspectionFromSchema } from 'graphql';
import { introspectSchema } from '@graphql-tools/wrap';
import { getInterpolatedHeadersFactory, getHeadersObject } from '@graphql-mesh/utils';

class GraphQLHandler {
    constructor({ name, config, cache }) {
        this.name = name;
        this.config = config;
        this.cache = cache;
    }
    async getMeshSource() {
        const urlLoader = new UrlLoader();
        const customFetch = (...args) => fetchache(args[0] instanceof Request ? args[0] : new Request(...args), this.cache);
        const getExecutorAndSubscriberForParams = (params, headersFactory) => {
            const resolverData = {
                root: {},
                args: params.variables,
                context: params.context,
            };
            const headers = getHeadersObject(headersFactory(resolverData));
            return urlLoader.getExecutorAndSubscriber(this.config.endpoint, {
                customFetch: customFetch,
                ...this.config,
                headers,
            });
        };
        let schema;
        const schemaHeadersFactory = getInterpolatedHeadersFactory(this.config.schemaHeaders);
        if (this.config.cacheIntrospection) {
            const cacheKey = this.name + '_introspection';
            const introspectionData = await this.cache.get(cacheKey);
            if (introspectionData) {
                schema = buildClientSchema(introspectionData);
            }
            else {
                schema = await introspectSchema(async (params) => {
                    const { executor } = await getExecutorAndSubscriberForParams(params, schemaHeadersFactory);
                    return executor(params);
                });
                await this.cache.set(cacheKey, introspectionFromSchema(schema));
            }
        }
        else {
            schema = await introspectSchema(async (params) => {
                const { executor } = await getExecutorAndSubscriberForParams(params, schemaHeadersFactory);
                return executor(params);
            });
        }
        const operationHeadersFactory = getInterpolatedHeadersFactory(this.config.operationHeaders);
        return {
            schema,
            executor: async (params) => {
                const { executor } = await getExecutorAndSubscriberForParams(params, operationHeadersFactory);
                return executor(params);
            },
            subscriber: async (params) => {
                const { subscriber } = await getExecutorAndSubscriberForParams(params, operationHeadersFactory);
                return subscriber(params);
            },
        };
    }
}

export default GraphQLHandler;
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