1 files changed, 67 insertions, 0 deletions
diff --git a/u/server/activity/health.ts b/u/server/activity/health.ts
new file mode 100644
index 0000000..0f54a99
--- /dev/null
+++ b/u/server/activity/health.ts
@@ -0,0 +1,67 @@
+import {
+  type IActivity,
+  type IEither,
+  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");
+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
+      .bimap(TraceUtil.withFunctionTrace(this.checkHealth))
+      .bimap(TraceUtil.withMetricTrace(healthCheckMetric))
+      .flatMap((r) => r.move(HealthCheckInput.CHECK).map(this.check))
+      .peek(TraceUtil.promiseify((h) =>
+        h.get().fold((err) => {
+          if (err) {
+            h.trace.trace(healthCheckMetric.failure);
+            h.trace.addTrace(LogLevel.ERROR).trace(`${err}`);
+            return;
+          }
+          h.trace.trace(healthCheckMetric.success);
+        })
+      ))
+      .map(TraceUtil.promiseify((h) =>
+        h.get()
+          .mapBoth(
+            () => "oh no, i need to eat more vegetables (｡•́︿•̀｡)...",
+            () => "think im healthy!! (✿˘◡˘) ready to do work~",
+          )
+          .fold((errMsg, okMsg) =>
+            new JsonResponse(
+              req,
+              errMsg ?? okMsg,
+              { status: errMsg ? 500 : 200 },
+            )
+          )
+      ))
+      .get();
+  }
+}