/
delegateToSchema.ts
181 lines (160 loc) · 4.18 KB
/
delegateToSchema.ts
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import {
FieldNode,
ArgumentNode,
Kind,
OperationDefinitionNode,
SelectionSetNode,
SelectionNode,
subscribe,
execute,
validate,
GraphQLResolveInfo,
GraphQLSchema,
} from 'graphql';
import {
Request,
IDelegateToSchemaOptions,
Transform,
OperationRootDefinition,
} from '../Interfaces';
import {
applyRequestTransforms,
applyResultTransforms
} from '../transforms/transforms';
import AddArgumentsAsVariables from '../transforms/AddArgumentsAsVariables';
import FilterToSchema from '../transforms/FilterToSchema';
import AddTypenameToAbstract from '../transforms/AddTypenameToAbstract';
import CheckResultAndHandleErrors from '../transforms/CheckResultAndHandleErrors';
export function createRequest(
targetSchema: GraphQLSchema,
targetOperation: 'query' | 'mutation' | 'subscription',
roots: Array<OperationRootDefinition>,
documentInfo: GraphQLResolveInfo,
transforms?: Array<Transform>,
): Request {
const selections: Array<SelectionNode> = roots.map(({ fieldName, info, alias }) => {
const newSelections: Array<SelectionNode> = info
? [].concat(...info.fieldNodes.map((field: FieldNode) => field.selectionSet ? field.selectionSet.selections : []))
: [];
const args: Array<ArgumentNode> = info
? [].concat( ...info.fieldNodes.map((field: FieldNode) => field.arguments || []))
: [];
const rootSelectionSet = newSelections.length > 0
? {
kind: Kind.SELECTION_SET,
selections: newSelections
}
: null;
const rootField: FieldNode = {
kind: Kind.FIELD,
name: {
kind: Kind.NAME,
value: fieldName,
},
alias: alias
? {
kind: Kind.NAME,
value: alias
}
: null,
selectionSet: rootSelectionSet,
arguments: args
};
return rootField;
}, []);
const selectionSet: SelectionSetNode = {
kind: Kind.SELECTION_SET,
selections,
};
const operationDefinition: OperationDefinitionNode = {
kind: Kind.OPERATION_DEFINITION,
operation: targetOperation,
variableDefinitions: documentInfo.operation.variableDefinitions,
selectionSet,
};
const fragments = Object.keys(documentInfo.fragments).map(
fragmentName => documentInfo.fragments[fragmentName],
);
const document = {
kind: Kind.DOCUMENT,
definitions: [operationDefinition, ...fragments],
};
const rawRequest: Request = {
document,
variables: documentInfo.variableValues as Record<string, any>,
};
transforms = [
...(transforms || []),
new AddArgumentsAsVariables(targetSchema, roots),
new FilterToSchema(targetSchema),
new AddTypenameToAbstract(targetSchema),
];
return applyRequestTransforms(rawRequest, transforms);
}
export default function delegateToSchema(
options: IDelegateToSchemaOptions | GraphQLSchema,
...args: any[],
): Promise<any> {
if (options instanceof GraphQLSchema) {
throw new Error(
'Passing positional arguments to delegateToSchema is a deprecated. ' +
'Please pass named parameters instead.'
);
}
return delegateToSchemaImplementation(options);
}
async function delegateToSchemaImplementation(
options: IDelegateToSchemaOptions,
): Promise<any> {
const {
info,
args = {},
fieldName,
schema,
operation,
context
} = options;
const processedRequest = createRequest(
schema,
operation,
[
{
fieldName,
args,
info
}
],
info,
options.transforms
);
const errors = validate(schema, processedRequest.document);
if (errors.length > 0) {
throw errors;
}
const transforms = [
...(options.transforms || []),
new CheckResultAndHandleErrors(info, fieldName),
];
if (operation === 'query' || operation === 'mutation') {
return applyResultTransforms(
await execute(
schema,
processedRequest.document,
info.rootValue,
context,
processedRequest.variables,
),
transforms,
);
}
if (operation === 'subscription') {
// apply result processing ???
return subscribe(
schema,
processedRequest.document,
info.rootValue,
context,
processedRequest.variables,
);
}
}