@graphql-mesh/runtime
Version:
174 lines (173 loc) • 8.22 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.useSubschema = void 0;
const graphql_1 = require("graphql");
const graphql_jit_1 = require("graphql-jit");
const core_1 = require("@envelop/core");
const utils_1 = require("@graphql-mesh/utils");
const delegate_1 = require("@graphql-tools/delegate");
const utils_2 = require("@graphql-tools/utils");
var IntrospectionQueryType;
(function (IntrospectionQueryType) {
IntrospectionQueryType["FEDERATION"] = "FEDERATION";
IntrospectionQueryType["REGULAR"] = "REGULAR";
IntrospectionQueryType["STREAM"] = "STREAM";
})(IntrospectionQueryType || (IntrospectionQueryType = {}));
const getIntrospectionOperationType = (0, utils_2.memoize1)(function getIntrospectionOperationType(operationAST) {
let introspectionQueryType = null;
if (operationAST.operation === 'query' && operationAST.selectionSet.selections.length === 1) {
(0, graphql_1.visit)(operationAST, {
Field: (node) => {
if (node.name.value === '__schema' || node.name.value === '__type') {
introspectionQueryType = IntrospectionQueryType.REGULAR;
return graphql_1.BREAK;
}
if (node.name.value === '_service') {
introspectionQueryType = IntrospectionQueryType.FEDERATION;
return graphql_1.BREAK;
}
if (node.directives?.some(d => d.name.value === 'stream')) {
introspectionQueryType = IntrospectionQueryType.STREAM;
return graphql_1.BREAK;
}
},
});
}
return introspectionQueryType;
});
function getExecuteFn(subschema) {
const compiledQueryCache = new WeakMap();
const transformedDocumentNodeCache = new WeakMap();
return function subschemaExecute(args) {
const originalRequest = {
document: args.document,
variables: args.variableValues,
operationName: args.operationName ?? undefined,
rootValue: args.rootValue,
context: args.contextValue,
};
const operationAST = (0, utils_2.getOperationASTFromRequest)(originalRequest);
// TODO: We need more elegant solution
const introspectionQueryType = getIntrospectionOperationType(operationAST);
if (introspectionQueryType === IntrospectionQueryType.FEDERATION) {
const executionResult = {
data: {
_service: {
sdl: (0, utils_2.printSchemaWithDirectives)(args.schema),
},
},
};
return executionResult;
}
else if (introspectionQueryType === IntrospectionQueryType.REGULAR) {
return (0, graphql_1.execute)(args);
}
const isStream = introspectionQueryType === IntrospectionQueryType.STREAM;
const delegationContext = {
subschema,
subschemaConfig: subschema,
targetSchema: args.schema,
operation: operationAST.operation,
fieldName: '', // Might not work
context: args.contextValue,
rootValue: args.rootValue,
transforms: subschema.transforms,
transformedSchema: subschema.transformedSchema,
skipTypeMerging: true,
returnType: (0, utils_2.getDefinedRootType)(args.schema, operationAST.operation),
};
let executor = subschema.executor;
if (executor == null) {
if (isStream || operationAST.operation === 'subscription') {
executor = (0, delegate_1.createDefaultExecutor)(subschema.schema);
}
else {
executor = function subschemaExecutor(request) {
let compiledQuery = compiledQueryCache.get(request.document);
if (!compiledQuery) {
const compilationResult = (0, graphql_jit_1.compileQuery)(subschema.schema, request.document, request.operationName, {
// TODO: Disable for now
customJSONSerializer: false,
disableLeafSerialization: true,
});
if (!(0, graphql_jit_1.isCompiledQuery)(compilationResult)) {
return compilationResult;
}
compiledQuery = compilationResult;
compiledQueryCache.set(request.document, compiledQuery);
}
if (operationAST.operation === 'subscription') {
const result$ = compiledQuery.subscribe(request.rootValue, request.context, request.variables);
if ((0, utils_2.isPromise)(result$)) {
return result$.then(result => {
result.stringify = compiledQuery.stringify;
return result;
});
}
result$.stringify = compiledQuery.stringify;
return result$;
}
const result$ = compiledQuery.query(request.rootValue, request.context, request.variables);
if ((0, utils_2.isPromise)(result$)) {
return result$.then(result => {
result.stringify = compiledQuery.stringify;
return result;
});
}
result$.stringify = compiledQuery.stringify;
return result$;
};
}
}
/*
if (subschema.batch) {
executor = createBatchingExecutor(executor);
}
*/
const transformationContext = {};
const transformedRequest = (0, utils_1.applyRequestTransforms)(originalRequest, delegationContext, transformationContext, subschema.transforms);
const cachedTransfomedDocumentNode = transformedDocumentNodeCache.get(originalRequest.document);
if (cachedTransfomedDocumentNode) {
transformedRequest.document = cachedTransfomedDocumentNode;
}
else {
transformedDocumentNodeCache.set(originalRequest.document, transformedRequest.document);
}
function handleResult(originalResult) {
if ((0, utils_2.isAsyncIterable)(originalResult)) {
return (0, core_1.mapAsyncIterator)(originalResult, singleResult => (0, utils_1.applyResultTransforms)(singleResult, delegationContext, transformationContext, subschema.transforms));
}
const transformedResult = (0, utils_1.applyResultTransforms)(originalResult, delegationContext, transformationContext, subschema.transforms);
return transformedResult;
}
const originalResult$ = executor(transformedRequest);
if ((0, utils_2.isPromise)(originalResult$)) {
return originalResult$.then(handleResult);
}
return handleResult(originalResult$);
};
}
// Creates an envelop plugin to execute a subschema inside Envelop
function useSubschema(subschema) {
const executeFn = getExecuteFn(subschema);
const plugin = {
onPluginInit({ setSchema }) {
// To prevent unwanted warnings from stitching
if (!('_transformedSchema' in subschema)) {
subschema.transformedSchema = (0, delegate_1.applySchemaTransforms)(subschema.schema, subschema);
}
subschema.transformedSchema.extensions =
subschema.transformedSchema.extensions || subschema.schema.extensions || {};
Object.assign(subschema.transformedSchema.extensions, subschema.schema.extensions);
setSchema(subschema.transformedSchema);
},
onExecute({ setExecuteFn }) {
setExecuteFn(executeFn);
},
onSubscribe({ setSubscribeFn }) {
setSubscribeFn(executeFn);
},
};
return plugin;
}
exports.useSubschema = useSubschema;