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import path from 'node:path'
import isError from '../../../lib/is-error'
import { INSTRUMENTATION_HOOK_FILENAME } from '../../../lib/constants'
import type {
InstrumentationModule,
InstrumentationOnRequestError,
} from '../../instrumentation/types'
import { interopDefault } from '../../../lib/interop-default'
let cachedInstrumentationModule: InstrumentationModule
export async function getInstrumentationModule(
projectDir: string,
distDir: string
): Promise<InstrumentationModule | undefined> {
if (cachedInstrumentationModule) {
return cachedInstrumentationModule
}
try {
cachedInstrumentationModule = interopDefault(
await require(
path.join(
projectDir,
distDir,
'server',
`${INSTRUMENTATION_HOOK_FILENAME}.js`
)
)
)
return cachedInstrumentationModule
} catch (err: unknown) {
if (
isError(err) &&
err.code !== 'ENOENT' &&
err.code !== 'MODULE_NOT_FOUND' &&
err.code !== 'ERR_MODULE_NOT_FOUND'
) {
throw err
}
}
}
let instrumentationModulePromise: Promise<any> | null = null
async function registerInstrumentation(projectDir: string, distDir: string) {
// Ensure registerInstrumentation is not called in production build
if (process.env.NEXT_PHASE === 'phase-production-build') {
return
}
if (!instrumentationModulePromise) {
instrumentationModulePromise = getInstrumentationModule(projectDir, distDir)
}
const instrumentation = await instrumentationModulePromise
if (instrumentation?.register) {
try {
await instrumentation.register()
} catch (err: any) {
err.message = `An error occurred while loading instrumentation hook: ${err.message}`
throw err
}
}
}
export async function instrumentationOnRequestError(
projectDir: string,
distDir: string,
...args: Parameters<InstrumentationOnRequestError>
) {
const instrumentation = await getInstrumentationModule(projectDir, distDir)
try {
await instrumentation?.onRequestError?.(...args)
} catch (err) {
// Log the soft error and continue, since the original error has already been thrown
console.error('Error in instrumentation.onRequestError:', err)
}
}
let registerInstrumentationPromise: Promise<void> | null = null
export function ensureInstrumentationRegistered(
projectDir: string,
distDir: string
) {
if (!registerInstrumentationPromise) {
registerInstrumentationPromise = registerInstrumentation(
projectDir,
distDir
)
}
return registerInstrumentationPromise
}
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