@graphql-mesh/utils
Version:
345 lines (344 loc) • 18.5 kB
JavaScript
import { parseSelectionSet } from '@graphql-tools/utils';
import { Kind, getNamedType, isAbstractType, isInterfaceType, isObjectType, } from 'graphql';
import { withFilter } from './with-filter.js';
import lodashGet from 'lodash.get';
import lodashSet from 'lodash.set';
import toPath from 'lodash.topath';
import { stringInterpolator } from '@graphql-mesh/string-interpolation';
import { loadFromModuleExportExpression } from './load-from-module-export-expression.js';
import { process } from '@graphql-mesh/cross-helpers';
function getTypeByPath(type, path) {
if ('ofType' in type) {
return getTypeByPath(getNamedType(type), path);
}
if (path.length === 0) {
return getNamedType(type);
}
if (!('getFields' in type)) {
throw new Error(`${type} cannot have a path ${path.join('.')}`);
}
const fieldMap = type.getFields();
const currentFieldName = path[0];
// Might be an index of an array
if (!Number.isNaN(parseInt(currentFieldName))) {
return getTypeByPath(type, path.slice(1));
}
const field = fieldMap[currentFieldName];
if (!(field === null || field === void 0 ? void 0 : field.type)) {
throw new Error(`${type}.${currentFieldName} is not a valid field.`);
}
return getTypeByPath(field.type, path.slice(1));
}
function generateSelectionSetFactory(schema, additionalResolver) {
if (additionalResolver.sourceSelectionSet) {
return () => parseSelectionSet(additionalResolver.sourceSelectionSet);
// If result path provided without a selectionSet
}
else if (additionalResolver.result) {
const resultPath = toPath(additionalResolver.result);
let abstractResultTypeName;
const sourceType = schema.getType(additionalResolver.sourceTypeName);
const sourceTypeFields = sourceType.getFields();
const sourceField = sourceTypeFields[additionalResolver.sourceFieldName];
const resultFieldType = getTypeByPath(sourceField.type, resultPath);
if (isAbstractType(resultFieldType)) {
if (additionalResolver.resultType) {
abstractResultTypeName = additionalResolver.resultType;
}
else {
const targetType = schema.getType(additionalResolver.targetTypeName);
const targetTypeFields = targetType.getFields();
const targetField = targetTypeFields[additionalResolver.targetFieldName];
const targetFieldType = getNamedType(targetField.type);
abstractResultTypeName = targetFieldType === null || targetFieldType === void 0 ? void 0 : targetFieldType.name;
}
if (abstractResultTypeName !== resultFieldType.name) {
const abstractResultType = schema.getType(abstractResultTypeName);
if ((isInterfaceType(abstractResultType) || isObjectType(abstractResultType)) &&
!schema.isSubType(resultFieldType, abstractResultType)) {
throw new Error(`${additionalResolver.sourceTypeName}.${additionalResolver.sourceFieldName}.${resultPath.join('.')} doesn't implement ${abstractResultTypeName}.}`);
}
}
}
return (subtree) => {
let finalSelectionSet = subtree;
let isLastResult = true;
const resultPathReversed = [...resultPath].reverse();
for (const pathElem of resultPathReversed) {
// Ensure the path elem is not array index
if (Number.isNaN(parseInt(pathElem))) {
if (isLastResult &&
abstractResultTypeName &&
abstractResultTypeName !== resultFieldType.name) {
finalSelectionSet = {
kind: Kind.SELECTION_SET,
selections: [
{
kind: Kind.INLINE_FRAGMENT,
typeCondition: {
kind: Kind.NAMED_TYPE,
name: {
kind: Kind.NAME,
value: abstractResultTypeName,
},
},
selectionSet: finalSelectionSet,
},
],
};
}
finalSelectionSet = {
kind: Kind.SELECTION_SET,
selections: [
{
// we create a wrapping AST Field
kind: Kind.FIELD,
name: {
kind: Kind.NAME,
value: pathElem,
},
// Inside the field selection
selectionSet: finalSelectionSet,
},
],
};
isLastResult = false;
}
}
return finalSelectionSet;
};
}
return undefined;
}
function generateValuesFromResults(resultExpression) {
return function valuesFromResults(result) {
if (Array.isArray(result)) {
return result.map(valuesFromResults);
}
return lodashGet(result, resultExpression);
};
}
export function resolveAdditionalResolversWithoutImport(additionalResolver, pubsub) {
const baseOptions = {};
if (additionalResolver.result) {
baseOptions.valuesFromResults = generateValuesFromResults(additionalResolver.result);
}
if ('pubsubTopic' in additionalResolver) {
return {
[additionalResolver.targetTypeName]: {
[additionalResolver.targetFieldName]: {
subscribe: withFilter((root, args, context, info) => {
const resolverData = { root, args, context, info, env: process.env };
const topic = stringInterpolator.parse(additionalResolver.pubsubTopic, resolverData);
return pubsub.asyncIterator(topic);
}, (root, args, context, info) => {
return additionalResolver.filterBy
? // eslint-disable-next-line no-new-func
new Function(`return ${additionalResolver.filterBy}`)()
: true;
}),
resolve: (payload) => {
if (baseOptions.valuesFromResults) {
return baseOptions.valuesFromResults(payload);
}
return payload;
},
},
},
};
}
else if ('keysArg' in additionalResolver) {
return {
[additionalResolver.targetTypeName]: {
[additionalResolver.targetFieldName]: {
selectionSet: additionalResolver.requiredSelectionSet || `{ ${additionalResolver.keyField} }`,
resolve: async (root, args, context, info) => {
if (!baseOptions.selectionSet) {
baseOptions.selectionSet = generateSelectionSetFactory(info.schema, additionalResolver);
}
const resolverData = { root, args, context, info, env: process.env };
const targetArgs = {};
for (const argPath in additionalResolver.additionalArgs || {}) {
lodashSet(targetArgs, argPath, stringInterpolator.parse(additionalResolver.additionalArgs[argPath], resolverData));
}
const options = {
...baseOptions,
root,
context,
info,
argsFromKeys: (keys) => {
const args = {};
lodashSet(args, additionalResolver.keysArg, keys);
Object.assign(args, targetArgs);
return args;
},
key: lodashGet(root, additionalResolver.keyField),
};
return context[additionalResolver.sourceName][additionalResolver.sourceTypeName][additionalResolver.sourceFieldName](options);
},
},
},
};
}
else if ('targetTypeName' in additionalResolver) {
return {
[additionalResolver.targetTypeName]: {
[additionalResolver.targetFieldName]: {
selectionSet: additionalResolver.requiredSelectionSet,
resolve: (root, args, context, info) => {
// Assert source exists
if (!context[additionalResolver.sourceName]) {
throw new Error(`No source found named "${additionalResolver.sourceName}"`);
}
if (!context[additionalResolver.sourceName][additionalResolver.sourceTypeName]) {
throw new Error(`No root type found named "${additionalResolver.sourceTypeName}" exists in the source ${additionalResolver.sourceName}\n` +
`It should be one of the following; ${Object.keys(context[additionalResolver.sourceName]).join(',')})}}`);
}
if (!context[additionalResolver.sourceName][additionalResolver.sourceTypeName][additionalResolver.sourceFieldName]) {
throw new Error(`No field named "${additionalResolver.sourceFieldName}" exists in the type ${additionalResolver.sourceTypeName} from the source ${additionalResolver.sourceName}`);
}
if (!baseOptions.selectionSet) {
baseOptions.selectionSet = generateSelectionSetFactory(info.schema, additionalResolver);
}
const resolverData = { root, args, context, info, env: process.env };
const targetArgs = {};
for (const argPath in additionalResolver.sourceArgs) {
lodashSet(targetArgs, argPath, stringInterpolator.parse(additionalResolver.sourceArgs[argPath].toString(), resolverData));
}
const options = {
...baseOptions,
root,
args: targetArgs,
context,
info,
};
return context[additionalResolver.sourceName][additionalResolver.sourceTypeName][additionalResolver.sourceFieldName](options);
},
},
},
};
}
else {
return additionalResolver;
}
}
export function resolveAdditionalResolvers(baseDir, additionalResolvers, importFn, pubsub) {
return Promise.all((additionalResolvers || []).map(async (additionalResolver) => {
if (typeof additionalResolver === 'string') {
const resolvers = await loadFromModuleExportExpression(additionalResolver, {
cwd: baseDir,
defaultExportName: 'resolvers',
importFn,
});
if (!resolvers) {
console.warn(`Unable to load resolvers from file: ${additionalResolver}`);
return {};
}
return resolvers;
}
else {
const baseOptions = {};
if (additionalResolver.result) {
baseOptions.valuesFromResults = generateValuesFromResults(additionalResolver.result);
}
if ('pubsubTopic' in additionalResolver) {
return {
[additionalResolver.targetTypeName]: {
[additionalResolver.targetFieldName]: {
subscribe: withFilter((root, args, context, info) => {
const resolverData = { root, args, context, info, env: process.env };
const topic = stringInterpolator.parse(additionalResolver.pubsubTopic, resolverData);
return pubsub.asyncIterator(topic);
}, (root, args, context, info) => {
return additionalResolver.filterBy
? // eslint-disable-next-line no-new-func
new Function(`return ${additionalResolver.filterBy}`)()
: true;
}),
resolve: (payload) => {
if (baseOptions.valuesFromResults) {
return baseOptions.valuesFromResults(payload);
}
return payload;
},
},
},
};
}
else if ('keysArg' in additionalResolver) {
return {
[additionalResolver.targetTypeName]: {
[additionalResolver.targetFieldName]: {
selectionSet: additionalResolver.requiredSelectionSet || `{ ${additionalResolver.keyField} }`,
resolve: async (root, args, context, info) => {
if (!baseOptions.selectionSet) {
baseOptions.selectionSet = generateSelectionSetFactory(info.schema, additionalResolver);
}
const resolverData = { root, args, context, info, env: process.env };
const targetArgs = {};
for (const argPath in additionalResolver.additionalArgs || {}) {
lodashSet(targetArgs, argPath, stringInterpolator.parse(additionalResolver.additionalArgs[argPath], resolverData));
}
const options = {
...baseOptions,
root,
context,
info,
argsFromKeys: (keys) => {
const args = {};
lodashSet(args, additionalResolver.keysArg, keys);
Object.assign(args, targetArgs);
return args;
},
key: lodashGet(root, additionalResolver.keyField),
};
return context[additionalResolver.sourceName][additionalResolver.sourceTypeName][additionalResolver.sourceFieldName](options);
},
},
},
};
}
else if ('targetTypeName' in additionalResolver) {
return {
[additionalResolver.targetTypeName]: {
[additionalResolver.targetFieldName]: {
selectionSet: additionalResolver.requiredSelectionSet,
resolve: (root, args, context, info) => {
// Assert source exists
if (!context[additionalResolver.sourceName]) {
throw new Error(`No source found named "${additionalResolver.sourceName}"`);
}
if (!context[additionalResolver.sourceName][additionalResolver.sourceTypeName]) {
throw new Error(`No root type found named "${additionalResolver.sourceTypeName}" exists in the source ${additionalResolver.sourceName}\n` +
`It should be one of the following; ${Object.keys(context[additionalResolver.sourceName]).join(',')})}}`);
}
if (!context[additionalResolver.sourceName][additionalResolver.sourceTypeName][additionalResolver.sourceFieldName]) {
throw new Error(`No field named "${additionalResolver.sourceFieldName}" exists in the type ${additionalResolver.sourceTypeName} from the source ${additionalResolver.sourceName}`);
}
if (!baseOptions.selectionSet) {
baseOptions.selectionSet = generateSelectionSetFactory(info.schema, additionalResolver);
}
const resolverData = { root, args, context, info, env: process.env };
const targetArgs = {};
for (const argPath in additionalResolver.sourceArgs) {
lodashSet(targetArgs, argPath, stringInterpolator.parse(additionalResolver.sourceArgs[argPath].toString(), resolverData));
}
const options = {
...baseOptions,
root,
args: targetArgs,
context,
info,
};
return context[additionalResolver.sourceName][additionalResolver.sourceTypeName][additionalResolver.sourceFieldName](options);
},
},
},
};
}
else {
return additionalResolver;
}
}
}));
}