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refactor: DRY with context building and *Impl functions #3656

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refactor: DRY with context building and *Impl functions #3656

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45 changes: 18 additions & 27 deletions src/execution/execute.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -165,6 +165,13 @@ export interface ExecutionArgs {
* a GraphQLError will be thrown immediately explaining the invalid input.
*/
export function execute(args: ExecutionArgs): PromiseOrValue<ExecutionResult> {
return prepareContextAndRunFn(args, executeImpl);
}

function prepareContextAndRunFn<T>(
args: ExecutionArgs,
fn: (exeContext: ExecutionContext) => T,
): ExecutionResult | T {
// If a valid execution context cannot be created due to incorrect arguments,
// a "Response" with only errors is returned.
const exeContext = buildExecutionContext(args);
Expand All @@ -174,7 +181,7 @@ export function execute(args: ExecutionArgs): PromiseOrValue<ExecutionResult> {
return { errors: exeContext };
}

return executeImpl(exeContext);
return fn(exeContext);
}

function executeImpl(
Expand Down Expand Up @@ -1034,24 +1041,17 @@ export function subscribe(
): PromiseOrValue<
AsyncGenerator<ExecutionResult, void, void> | ExecutionResult
> {
// If a valid execution context cannot be created due to incorrect arguments,
// a "Response" with only errors is returned.
const exeContext = buildExecutionContext(args);
return prepareContextAndRunFn(args, (exeContext: ExecutionContext) => {
const resultOrStream = createSourceEventStreamImpl(exeContext);

// Return early errors if execution context failed.
if (!('schema' in exeContext)) {
return { errors: exeContext };
}

const resultOrStream = createSourceEventStreamImpl(exeContext);

if (isPromise(resultOrStream)) {
return resultOrStream.then((resolvedResultOrStream) =>
mapSourceToResponse(exeContext, resolvedResultOrStream),
);
}
if (isPromise(resultOrStream)) {
return resultOrStream.then((resolvedResultOrStream) =>
mapSourceToResponse(exeContext, resolvedResultOrStream),
);
}

return mapSourceToResponse(exeContext, resultOrStream);
return mapSourceToResponse(exeContext, resultOrStream);
});
}

function mapSourceToResponse(
Expand Down Expand Up @@ -1106,16 +1106,7 @@ function mapSourceToResponse(
export function createSourceEventStream(
args: ExecutionArgs,
): PromiseOrValue<AsyncIterable<unknown> | ExecutionResult> {
// If a valid execution context cannot be created due to incorrect arguments,
// a "Response" with only errors is returned.
const exeContext = buildExecutionContext(args);

// Return early errors if execution context failed.
if (!('schema' in exeContext)) {
return { errors: exeContext };
}

return createSourceEventStreamImpl(exeContext);
return prepareContextAndRunFn(args, createSourceEventStreamImpl);
}

function createSourceEventStreamImpl(
Expand Down