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Small non-breaking refactors #918

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merged 3 commits into from Aug 2, 2018
Merged

Small non-breaking refactors #918

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76279d4
Move createNamedStub utility function out
Aug 2, 2018
cc05cde
Un-abstract typeFromAST
Aug 2, 2018
8df0cd0
Turns out, you could never configure visitType
Aug 2, 2018
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78 changes: 7 additions & 71 deletions src/stitching/mergeSchemas.ts
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@@ -1,14 +1,11 @@
import {
DocumentNode,
GraphQLField,
GraphQLInputObjectType,
GraphQLInterfaceType,
GraphQLNamedType,
GraphQLObjectType,
GraphQLResolveInfo,
GraphQLScalarType,
GraphQLSchema,
GraphQLString,
extendSchema,
getNamedType,
isNamedType,
Expand All @@ -21,7 +18,6 @@ import {
MergeInfo,
MergeTypeCandidate,
TypeWithResolvers,
VisitType,
VisitTypeResult,
IResolversParameter,
} from '../Interfaces';
Expand All @@ -35,7 +31,7 @@ import {
createResolveType,
} from './schemaRecreation';
import delegateToSchema from './delegateToSchema';
import typeFromAST, { GetType } from './typeFromAST';
import typeFromAST from './typeFromAST';
import {
Transform,
ExpandAbstractTypes,
Expand Down Expand Up @@ -70,25 +66,16 @@ export default function mergeSchemas({
schemaDirectives?: { [name: string]: typeof SchemaDirectiveVisitor };
inheritResolversFromInterfaces?: boolean;
}): GraphQLSchema {
let visitType: VisitType = defaultVisitType;
if (onTypeConflict) {
console.warn(
'`onTypeConflict` is deprecated. Use schema transforms to customize merging logic.',
);
visitType = createVisitTypeFromOnTypeConflict(onTypeConflict);
}
return mergeSchemasImplementation({ schemas, visitType, resolvers, schemaDirectives, inheritResolversFromInterfaces });
return mergeSchemasImplementation({ schemas, resolvers, schemaDirectives, inheritResolversFromInterfaces });
}

function mergeSchemasImplementation({
schemas,
visitType,
resolvers,
schemaDirectives,
inheritResolversFromInterfaces
}: {
schemas: Array<string | GraphQLSchema | Array<GraphQLNamedType>>;
visitType?: VisitType;
resolvers?: IResolversParameter;
schemaDirectives?: { [name: string]: typeof SchemaDirectiveVisitor };
inheritResolversFromInterfaces?: boolean;
Expand All @@ -102,36 +89,13 @@ function mergeSchemasImplementation({
fragment: string;
}> = [];

if (!visitType) {
visitType = defaultVisitType;
}

const resolveType = createResolveType(name => {
if (types[name] === undefined) {
throw new Error(`Can't find type ${name}.`);
}
return types[name];
});

const createNamedStub: GetType = (name, type) => {
let constructor: any;
if (type === 'object') {
constructor = GraphQLObjectType;
} else if (type === 'interface') {
constructor = GraphQLInterfaceType;
} else {
constructor = GraphQLInputObjectType;
}
return new constructor({
name,
fields: {
__fake: {
type: GraphQLString,
},
},
});
};

schemas.forEach(schema => {
if (schema instanceof GraphQLSchema) {
allSchemas.push(schema);
Expand Down Expand Up @@ -176,7 +140,7 @@ function mergeSchemasImplementation({
} else if (typeof schema === 'string') {
let parsedSchemaDocument = parse(schema);
parsedSchemaDocument.definitions.forEach(def => {
const type = typeFromAST(def, createNamedStub);
const type = typeFromAST(def);
if (type) {
addTypeCandidate(typeCandidates, type.name, {
type: type,
Expand Down Expand Up @@ -225,7 +189,7 @@ function mergeSchemasImplementation({
let generatedResolvers = {};

Object.keys(typeCandidates).forEach(typeName => {
const resultType: VisitTypeResult = visitType(
const resultType: VisitTypeResult = defaultVisitType(
typeName,
typeCandidates[typeName],
);
Expand Down Expand Up @@ -443,41 +407,13 @@ function addTypeCandidate(
typeCandidates[name].push(typeCandidate);
}

function createVisitTypeFromOnTypeConflict(
onTypeConflict: OnTypeConflict,
): VisitType {
return (name, candidates) =>
defaultVisitType(name, candidates, cands =>
cands.reduce((prev, next) => {
const type = onTypeConflict(prev.type, next.type, {
left: {
schema: prev.schema,
},
right: {
schema: next.schema,
},
});
if (prev.type === type) {
return prev;
} else if (next.type === type) {
return next;
} else {
return {
schemaName: 'unknown',
type,
};
}
}),
);
}

const defaultVisitType = (
function defaultVisitType(
name: string,
candidates: Array<MergeTypeCandidate>,
candidateSelector?: (
candidates: Array<MergeTypeCandidate>,
) => MergeTypeCandidate,
) => {
) {
if (!candidateSelector) {
candidateSelector = cands => cands[cands.length - 1];
}
Expand Down Expand Up @@ -526,4 +462,4 @@ const defaultVisitType = (
const candidate = candidateSelector(candidates);
return candidate.type;
}
};
}
72 changes: 44 additions & 28 deletions src/stitching/typeFromAST.ts
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Expand Up @@ -22,7 +22,8 @@ import {
TypeNode,
UnionTypeDefinitionNode,
valueFromAST,
getDescription
getDescription,
GraphQLString
} from 'graphql';
import resolveFromParentType from './resolveFromParentTypename';

Expand All @@ -36,48 +37,45 @@ export type GetType = (

export default function typeFromAST(
node: DefinitionNode,
getType: GetType,
): GraphQLNamedType | null {
switch (node.kind) {
case Kind.OBJECT_TYPE_DEFINITION:
return makeObjectType(node, getType);
return makeObjectType(node);
case Kind.INTERFACE_TYPE_DEFINITION:
return makeInterfaceType(node, getType);
return makeInterfaceType(node);
case Kind.ENUM_TYPE_DEFINITION:
return makeEnumType(node, getType);
return makeEnumType(node);
case Kind.UNION_TYPE_DEFINITION:
return makeUnionType(node, getType);
return makeUnionType(node);
case Kind.SCALAR_TYPE_DEFINITION:
return makeScalarType(node, getType);
return makeScalarType(node);
case Kind.INPUT_OBJECT_TYPE_DEFINITION:
return makeInputObjectType(node, getType);
return makeInputObjectType(node);
default:
return null;
}
}

function makeObjectType(
node: ObjectTypeDefinitionNode,
getType: GetType,
): GraphQLObjectType {
return new GraphQLObjectType({
name: node.name.value,
fields: () => makeFields(node.fields, getType),
fields: () => makeFields(node.fields),
interfaces: () =>
node.interfaces.map(
iface => getType(iface.name.value, 'interface') as GraphQLInterfaceType,
iface => createNamedStub(iface.name.value, 'interface') as GraphQLInterfaceType,
),
description: getDescription(node, backcompatOptions),
});
}

function makeInterfaceType(
node: InterfaceTypeDefinitionNode,
getType: GetType,
): GraphQLInterfaceType {
return new GraphQLInterfaceType({
name: node.name.value,
fields: () => makeFields(node.fields, getType),
fields: () => makeFields(node.fields),
description: getDescription(node, backcompatOptions),
resolveType: (parent, context, info) =>
resolveFromParentType(parent, info.schema),
Expand All @@ -86,7 +84,6 @@ function makeInterfaceType(

function makeEnumType(
node: EnumTypeDefinitionNode,
getType: GetType,
): GraphQLEnumType {
const values = {};
node.values.forEach(value => {
Expand All @@ -103,13 +100,12 @@ function makeEnumType(

function makeUnionType(
node: UnionTypeDefinitionNode,
getType: GetType,
): GraphQLUnionType {
return new GraphQLUnionType({
name: node.name.value,
types: () =>
node.types.map(
type => resolveType(type, getType, 'object') as GraphQLObjectType,
type => resolveType(type, 'object') as GraphQLObjectType,
),
description: getDescription(node, backcompatOptions),
resolveType: (parent, context, info) =>
Expand All @@ -119,7 +115,6 @@ function makeUnionType(

function makeScalarType(
node: ScalarTypeDefinitionNode,
getType: GetType,
): GraphQLScalarType {
return new GraphQLScalarType({
name: node.name.value,
Expand All @@ -136,31 +131,30 @@ function makeScalarType(

function makeInputObjectType(
node: InputObjectTypeDefinitionNode,
getType: GetType,
): GraphQLInputObjectType {
return new GraphQLInputObjectType({
name: node.name.value,
fields: () => makeValues(node.fields, getType),
fields: () => makeValues(node.fields),
description: getDescription(node, backcompatOptions),
});
}

function makeFields(nodes: Array<FieldDefinitionNode>, getType: GetType) {
function makeFields(nodes: Array<FieldDefinitionNode>) {
const result = {};
nodes.forEach(node => {
result[node.name.value] = {
type: resolveType(node.type, getType, 'object'),
args: makeValues(node.arguments, getType),
type: resolveType(node.type, 'object'),
args: makeValues(node.arguments),
description: getDescription(node, backcompatOptions),
};
});
return result;
}

function makeValues(nodes: Array<InputValueDefinitionNode>, getType: GetType) {
function makeValues(nodes: Array<InputValueDefinitionNode>) {
const result = {};
nodes.forEach(node => {
const type = resolveType(node.type, getType, 'input') as GraphQLInputType;
const type = resolveType(node.type, 'input') as GraphQLInputType;
result[node.name.value] = {
type,
defaultValue: valueFromAST(node.defaultValue, type),
Expand All @@ -172,15 +166,37 @@ function makeValues(nodes: Array<InputValueDefinitionNode>, getType: GetType) {

function resolveType(
node: TypeNode,
getType: GetType,
type: 'object' | 'interface' | 'input',
): GraphQLType {
switch (node.kind) {
case Kind.LIST_TYPE:
return new GraphQLList(resolveType(node.type, getType, type));
return new GraphQLList(resolveType(node.type, type));
case Kind.NON_NULL_TYPE:
return new GraphQLNonNull(resolveType(node.type, getType, type));
return new GraphQLNonNull(resolveType(node.type, type));
default:
return getType(node.name.value, type);
return createNamedStub(node.name.value, type);
}
}

function createNamedStub(
name: string,
type: 'object' | 'interface' | 'input'
): GraphQLObjectType | GraphQLInputObjectType | GraphQLInterfaceType {
let constructor: any;
if (type === 'object') {
constructor = GraphQLObjectType;
} else if (type === 'interface') {
constructor = GraphQLInterfaceType;
} else {
constructor = GraphQLInputObjectType;
}

return new constructor({
name,
fields: {
__fake: {
type: GraphQLString,
},
},
});
}