Logger Plugin

[dinwwwh]

Describe the feature

A plugin that logging info about:

• request/response status, general infos, timing, ...
• Error happened (support event iterator: https://github.com/unnoq/orpc/issues/604)
• ...

Additional information

• Would you be willing to help implement this feature?

[maelp]

I did it that way (with special Zod validation handling, since for now it's BAD_REQUEST but I prefer UNPROCESSABLE_CONTENT)

  clientInterceptors: [
    onError((error) => {
      logger.error(error, "Unhandled error");
      recordException(error as Error); // for otel

      // Map oRPC BAD_REQUEST validation errors to 422 UNPROCESSABLE_CONTENT with Zod flattened data
      if (
        error instanceof ORPCError &&
        error.code === "BAD_REQUEST" &&
        error.cause instanceof ValidationError
      ) {
        const zodError = new z.ZodError(
          error.cause.issues as z.core.$ZodIssue[],
        );
        const message = z.prettifyError(zodError);
        const data = z.flattenError(zodError);
        throw new ORPCError("UNPROCESSABLE_CONTENT", {
          status: 422,
          message,
          data,
          cause: error.cause,
        });
      }

      // Surface output validation failures distinctly
      if (
        error instanceof ORPCError &&
        error.code === "INTERNAL_SERVER_ERROR" &&
        error.cause instanceof ValidationError
      ) {
        throw new ORPCError("OUTPUT_VALIDATION_FAILED", { cause: error.cause });
      }
    }),
  ],