1 | import { fetchache, Request } from 'fetchache';
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2 | import { UrlLoader } from '@graphql-tools/url-loader';
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3 | import { buildClientSchema, introspectionFromSchema } from 'graphql';
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4 | import { introspectSchema } from '@graphql-tools/wrap';
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5 | import { getInterpolatedHeadersFactory, getHeadersObject } from '@graphql-mesh/utils';
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6 |
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7 | class GraphQLHandler {
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8 | constructor({ name, config, cache }) {
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9 | this.name = name;
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10 | this.config = config;
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11 | this.cache = cache;
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12 | }
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13 | async getMeshSource() {
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14 | const urlLoader = new UrlLoader();
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15 | const customFetch = (...args) => fetchache(args[0] instanceof Request ? args[0] : new Request(...args), this.cache);
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16 | const getExecutorAndSubscriberForParams = (params, headersFactory) => {
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17 | const resolverData = {
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18 | root: {},
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19 | args: params.variables,
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20 | context: params.context,
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21 | };
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22 | const headers = getHeadersObject(headersFactory(resolverData));
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23 | return urlLoader.getExecutorAndSubscriber(this.config.endpoint, {
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24 | customFetch: customFetch,
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25 | ...this.config,
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26 | headers,
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27 | });
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28 | };
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29 | let schema;
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30 | const schemaHeadersFactory = getInterpolatedHeadersFactory(this.config.schemaHeaders);
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31 | if (this.config.introspection) {
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32 | const result = await urlLoader.handleSDL(this.config.introspection, {
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33 | customFetch: customFetch,
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34 | ...this.config,
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35 | headers: this.config.schemaHeaders,
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36 | });
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37 | schema = result.schema;
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38 | }
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39 | else if (this.config.cacheIntrospection) {
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40 | const cacheKey = this.name + '_introspection';
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41 | const introspectionData = await this.cache.get(cacheKey);
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42 | if (introspectionData) {
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43 | schema = buildClientSchema(introspectionData);
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44 | }
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45 | else {
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46 | schema = await introspectSchema(async (params) => {
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47 | const { executor } = await getExecutorAndSubscriberForParams(params, schemaHeadersFactory);
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48 | return executor(params);
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49 | });
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50 | const ttl = typeof this.config.cacheIntrospection === 'object' && this.config.cacheIntrospection.ttl;
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51 | const introspection = introspectionFromSchema(schema);
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52 | this.cache.set(cacheKey, introspection, { ttl });
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53 | }
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54 | }
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55 | else {
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56 | schema = await introspectSchema(async (params) => {
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57 | const { executor } = await getExecutorAndSubscriberForParams(params, schemaHeadersFactory);
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58 | return executor(params);
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59 | });
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60 | }
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61 | const operationHeadersFactory = getInterpolatedHeadersFactory(this.config.operationHeaders);
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62 | return {
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63 | schema,
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64 | executor: async (params) => {
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65 | const { executor } = await getExecutorAndSubscriberForParams(params, operationHeadersFactory);
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66 | return executor(params);
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67 | },
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68 | subscriber: async (params) => {
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69 | const { subscriber } = await getExecutorAndSubscriberForParams(params, operationHeadersFactory);
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70 | return subscriber(params);
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71 | },
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72 | };
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73 | }
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74 | }
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75 |
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76 | export default GraphQLHandler;
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77 |
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