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fix(@opentelemetry/instrumentation-dataloader): fix instrumentation of ESM-imported dataloader #2813

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fix(@opentelemetry/instrumentation-dataloader): fix instrumentation of ESM-imported dataloader #2813

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22 changes: 15 additions & 7 deletions plugins/node/instrumentation-dataloader/src/instrumentation.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,12 @@
type LoadFn = (typeof Dataloader.prototype)['load'];
type LoadManyFn = (typeof Dataloader.prototype)['loadMany'];

function extractModuleExports(module: any) {
return module[Symbol.toStringTag] === 'Module'
? module.default // ESM

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plugins/node/instrumentation-dataloader/src/instrumentation.ts#L49 

Added line #L49 was not covered by tests
: module; // CommonJS
}

export class DataloaderInstrumentation extends InstrumentationBase<DataloaderInstrumentationConfig> {
constructor(config: DataloaderInstrumentationConfig = {}) {
super(PACKAGE_NAME, PACKAGE_VERSION, config);
Expand All @@ -55,18 +61,20 @@
MODULE_NAME,
['>=2.0.0 <3'],
dataloader => {
this._patchLoad(dataloader.prototype);
this._patchLoadMany(dataloader.prototype);
const dataloaderExports = extractModuleExports(dataloader);
this._patchLoad(dataloaderExports.prototype);
this._patchLoadMany(dataloaderExports.prototype);

return this._getPatchedConstructor(dataloader);
return this._getPatchedConstructor(dataloaderExports);
},
dataloader => {
if (isWrapped(dataloader.prototype.load)) {
this._unwrap(dataloader.prototype, 'load');
const dataloaderExports = extractModuleExports(dataloader);
if (isWrapped(dataloaderExports.prototype.load)) {
this._unwrap(dataloaderExports.prototype, 'load');
}

if (isWrapped(dataloader.prototype.loadMany)) {
this._unwrap(dataloader.prototype, 'loadMany');
if (isWrapped(dataloaderExports.prototype.loadMany)) {
this._unwrap(dataloaderExports.prototype, 'loadMany');
}
}
) as InstrumentationNodeModuleDefinition,
Expand Down