1 | import { inferSchema, makeAugmentedSchema } from 'neo4j-graphql-js';
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2 | import neo4j from 'neo4j-driver';
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3 | import { loadTypedefs } from '@graphql-tools/load';
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4 | import { GraphQLFileLoader } from '@graphql-tools/graphql-file-loader';
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5 | import { CodeFileLoader } from '@graphql-tools/code-file-loader';
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6 | import { mergeTypeDefs } from '@graphql-tools/merge';
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7 |
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8 | class Neo4JHandler {
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9 | constructor({ name, cache, config, pubsub }) {
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10 | this.name = name;
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11 | this.cache = cache;
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12 | this.config = config;
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13 | this.pubsub = pubsub;
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14 | }
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15 | getDriver() {
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16 | if (!this.driver) {
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17 | this.driver = neo4j.driver(this.config.url, neo4j.auth.basic(this.config.username, this.config.password));
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18 | this.pubsub.subscribe('destroy', () => this.driver.close());
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19 | }
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20 | return this.driver;
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21 | }
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22 | async getMeshSource() {
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23 | let typeDefs;
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24 | const cacheKey = this.name + '_introspection';
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25 | if (this.config.typeDefs) {
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26 | const typeDefsArr = await loadTypedefs(this.config.typeDefs, {
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27 | loaders: [new CodeFileLoader(), new GraphQLFileLoader()],
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28 | assumeValid: true,
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29 | assumeValidSDL: true,
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30 | });
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31 | typeDefs = mergeTypeDefs(typeDefsArr.map(source => source.document));
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32 | }
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33 | else {
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34 | if (this.config.cacheIntrospection) {
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35 | typeDefs = await this.cache.get(cacheKey);
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36 | }
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37 | if (!typeDefs) {
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38 | const inferredSchema = await inferSchema(this.getDriver(), {
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39 | alwaysIncludeRelationships: this.config.alwaysIncludeRelationships,
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40 | });
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41 | typeDefs = inferredSchema.typeDefs;
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42 | if (this.config.cacheIntrospection) {
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43 | await this.cache.set(cacheKey, typeDefs, {
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44 | ttl: typeof this.config.cacheIntrospection === 'object' && this.config.cacheIntrospection.ttl,
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45 | });
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46 | }
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47 | }
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48 | }
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49 | const schema = makeAugmentedSchema({ typeDefs, config: { experimental: true } });
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50 | return {
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51 | schema,
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52 | contextBuilder: async () => ({ driver: this.getDriver(), neo4jDatabase: this.config.database }),
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53 | };
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54 | }
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55 | }
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56 |
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57 | export default Neo4JHandler;
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58 |
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