@kamilkisiela/graphql-tools/dist/stitching/makeRemoteExecutableSchema.js

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Object.defineProperty(exports, "__esModule", { value: true });
var graphql_1 = require("graphql");
var linkToFetcher_1 = require("./linkToFetcher");
var isEmptyObject_1 = require("../isEmptyObject");
var makeExecutableSchema_1 = require("../makeExecutableSchema");
var schemaRecreation_1 = require("./schemaRecreation");
var resolveFromParentTypename_1 = require("./resolveFromParentTypename");
var defaultMergedResolver_1 = require("./defaultMergedResolver");
var errors_1 = require("./errors");
var observableToAsyncIterable_1 = require("./observableToAsyncIterable");
function makeRemoteExecutableSchema(_a) {
    var schema = _a.schema, link = _a.link, fetcher = _a.fetcher, _b = _a.createResolver, customCreateResolver = _b === void 0 ? createResolver : _b, buildSchemaOptions = _a.buildSchemaOptions, _c = _a.printSchemaOptions, printSchemaOptions = _c === void 0 ? { commentDescriptions: true } : _c;
    var _d;
    if (!fetcher && link) {
        fetcher = linkToFetcher_1.default(link);
    }
    var typeDefs;
    if (typeof schema === 'string') {
        typeDefs = schema;
        schema = graphql_1.buildSchema(typeDefs, buildSchemaOptions);
    }
    else {
        typeDefs = graphql_1.printSchema(schema, printSchemaOptions);
    }
    // prepare query resolvers
    var queryResolvers = {};
    var queryType = schema.getQueryType();
    var queries = queryType.getFields();
    Object.keys(queries).forEach(function (key) {
        queryResolvers[key] = customCreateResolver(fetcher);
    });
    // prepare mutation resolvers
    var mutationResolvers = {};
    var mutationType = schema.getMutationType();
    if (mutationType) {
        var mutations = mutationType.getFields();
        Object.keys(mutations).forEach(function (key) {
            mutationResolvers[key] = customCreateResolver(fetcher);
        });
    }
    // prepare subscription resolvers
    var subscriptionResolvers = {};
    var subscriptionType = schema.getSubscriptionType();
    if (subscriptionType) {
        var subscriptions = subscriptionType.getFields();
        Object.keys(subscriptions).forEach(function (key) {
            subscriptionResolvers[key] = {
                subscribe: createSubscriptionResolver(key, link)
            };
        });
    }
    // merge resolvers into resolver map
    var resolvers = (_d = {}, _d[queryType.name] = queryResolvers, _d);
    if (!isEmptyObject_1.default(mutationResolvers)) {
        resolvers[mutationType.name] = mutationResolvers;
    }
    if (!isEmptyObject_1.default(subscriptionResolvers)) {
        resolvers[subscriptionType.name] = subscriptionResolvers;
    }
    // add missing abstract resolvers (scalar, unions, interfaces)
    var typeMap = schema.getTypeMap();
    var types = Object.keys(typeMap).map(function (name) { return typeMap[name]; });
    var _loop_1 = function (type) {
        if (type instanceof graphql_1.GraphQLInterfaceType || type instanceof graphql_1.GraphQLUnionType) {
            resolvers[type.name] = {
                __resolveType: function (parent, context, info) {
                    return resolveFromParentTypename_1.default(parent, info.schema);
                }
            };
        }
        else if (type instanceof graphql_1.GraphQLScalarType) {
            if (!(type === graphql_1.GraphQLID ||
                type === graphql_1.GraphQLString ||
                type === graphql_1.GraphQLFloat ||
                type === graphql_1.GraphQLBoolean ||
                type === graphql_1.GraphQLInt)) {
                resolvers[type.name] = schemaRecreation_1.recreateType(type, function (name) { return null; }, false);
            }
        }
        else if (type instanceof graphql_1.GraphQLObjectType &&
            type.name.slice(0, 2) !== '__' &&
            type !== queryType &&
            type !== mutationType &&
            type !== subscriptionType) {
            var resolver_1 = {};
            Object.keys(type.getFields()).forEach(function (field) {
                resolver_1[field] = defaultMergedResolver_1.default;
            });
            resolvers[type.name] = resolver_1;
        }
    };
    for (var _i = 0, types_1 = types; _i < types_1.length; _i++) {
        var type = types_1[_i];
        _loop_1(type);
    }
    return makeExecutableSchema_1.makeExecutableSchema({
        typeDefs: typeDefs,
        resolvers: resolvers
    });
}
exports.default = makeRemoteExecutableSchema;
function createResolver(fetcher) {
    var _this = this;
    return function (root, args, context, info) { return __awaiter(_this, void 0, void 0, function () {
        var fragments, document, result;
        return __generator(this, function (_a) {
            switch (_a.label) {
                case 0:
                    fragments = Object.keys(info.fragments).map(function (fragment) { return info.fragments[fragment]; });
                    document = {
                        kind: graphql_1.Kind.DOCUMENT,
                        definitions: [info.operation].concat(fragments)
                    };
                    return [4 /*yield*/, fetcher({
                            query: document,
                            variables: info.variableValues,
                            context: { graphqlContext: context }
                        })];
                case 1:
                    result = _a.sent();
                    return [2 /*return*/, errors_1.checkResultAndHandleErrors(result, info)];
            }
        });
    }); };
}
exports.createResolver = createResolver;
function createSubscriptionResolver(name, link) {
    return function (root, args, context, info) {
        var fragments = Object.keys(info.fragments).map(function (fragment) { return info.fragments[fragment]; });
        var document = {
            kind: graphql_1.Kind.DOCUMENT,
            definitions: [info.operation].concat(fragments)
        };
        var operation = {
            query: document,
            variables: info.variableValues,
            context: { graphqlContext: context }
        };
        var observable = linkToFetcher_1.execute(link, operation);
        return observableToAsyncIterable_1.observableToAsyncIterable(observable);
    };
}
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