@graphql-mesh/neo4j/index.esm.js

import { inferSchema, makeAugmentedSchema } from 'neo4j-graphql-js';
import neo4j from 'neo4j-driver';
import { loadTypedefs } from '@graphql-tools/load';
import { GraphQLFileLoader } from '@graphql-tools/graphql-file-loader';
import { CodeFileLoader } from '@graphql-tools/code-file-loader';
import { mergeTypeDefs } from '@graphql-tools/merge';

class Neo4JHandler {
    constructor({ name, cache, config, pubsub }) {
        this.name = name;
        this.cache = cache;
        this.config = config;
        this.pubsub = pubsub;
    }
    getDriver() {
        if (!this.driver) {
            this.driver = neo4j.driver(this.config.url, neo4j.auth.basic(this.config.username, this.config.password));
            this.pubsub.subscribe('destroy', () => this.driver.close());
        }
        return this.driver;
    }
    async getMeshSource() {
        let typeDefs;
        const cacheKey = this.name + '_introspection';
        if (this.config.typeDefs) {
            const typeDefsArr = await loadTypedefs(this.config.typeDefs, {
                loaders: [new CodeFileLoader(), new GraphQLFileLoader()],
                assumeValid: true,
                assumeValidSDL: true,
            });
            typeDefs = mergeTypeDefs(typeDefsArr.map(source => source.document));
        }
        else {
            if (this.config.cacheIntrospection) {
                typeDefs = await this.cache.get(cacheKey);
            }
            if (!typeDefs) {
                const inferredSchema = await inferSchema(this.getDriver(), {
                    alwaysIncludeRelationships: this.config.alwaysIncludeRelationships,
                });
                typeDefs = inferredSchema.typeDefs;
                if (this.config.cacheIntrospection) {
                    await this.cache.set(cacheKey, typeDefs, {
                        ttl: typeof this.config.cacheIntrospection === 'object' && this.config.cacheIntrospection.ttl,
                    });
                }
            }
        }
        const schema = makeAugmentedSchema({ typeDefs, config: { experimental: true } });
        return {
            schema,
            contextBuilder: async () => ({ driver: this.getDriver(), neo4jDatabase: this.config.database }),
        };
    }
}

export default Neo4JHandler;
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