1 files changed, 49 insertions, 0 deletions
diff --git a/lib/server/activity/health.ts b/lib/server/activity/health.ts
new file mode 100644
index 0000000..9396490
--- /dev/null
+++ b/lib/server/activity/health.ts
@@ -0,0 +1,49 @@
+import {
+    type IActivity,
+    type IEither,
+    IMetric,
+    type ITraceable,
+    JsonResponse,
+    LogLevel,
+    type Mapper,
+    Metric,
+    type PenguenoRequest,
+    type ServerTrace,
+    TraceUtil,
+} from '@emprespresso/pengueno';
+
+export enum HealthCheckInput {
+    CHECK,
+}
+export enum HealthCheckOutput {
+    YAASSSLAYQUEEN,
+}
+
+export interface IHealthCheckActivity {
+    checkHealth: IActivity;
+}
+
+const healthCheckMetric = Metric.fromName('Health').asResult();
+export interface HealthChecker
+    extends Mapper<ITraceable<HealthCheckInput, ServerTrace>, Promise<IEither<Error, HealthCheckOutput>>> {}
+export class HealthCheckActivityImpl implements IHealthCheckActivity {
+    constructor(private readonly check: HealthChecker) {}
+
+    public checkHealth(req: ITraceable<PenguenoRequest, ServerTrace>) {
+        return req
+            .flatMap(TraceUtil.withFunctionTrace(this.checkHealth))
+            .flatMap(TraceUtil.withMetricTrace(healthCheckMetric))
+            .flatMap((r) => r.move(HealthCheckInput.CHECK).map((input) => this.check(input)))
+            .peek(TraceUtil.promiseify(TraceUtil.traceResultingEither(healthCheckMetric)))
+            .map(
+                TraceUtil.promiseify((h) => {
+                    const { status, message } = h.get().fold(
+                        () => ({ status: 500, message: 'err' }),
+                        () => ({ status: 200, message: 'ok' }),
+                    );
+                    return new JsonResponse(req, message, { status });
+                }),
+            )
+            .get();
+    }
+}