wip: Add in the start of a health check

lib/health/HealthCheck.ts

@@ -0,0 +1,55 @@
+// import { InterfaceReceipt } from "../mainFn/interfaceReceipt";
+// import { Daemon, Effects } from "../types";
+// import { CheckResult } from "./checkFns/CheckResult";
+// import { ReadyReceipt } from "./ReadyProof";
+// import { HealthReceipt } from "./HealthReceipt";
+// import { Trigger } from "./trigger";
+// import { TriggerInput } from "./trigger/TriggerInput";
+// import { defaultTrigger } from "./trigger/defaultTrigger";
+
+// function readReciptOf<A extends { daemon: Daemon }>(a: A) {
+//   return a as A & ReadyReceipt;
+// }
+// export function readyCheck(o: {
+//   effects: Effects;
+//   started(onTerm: () => void): null;
+//   interfaceReceipt: InterfaceReceipt;
+//   healthReceipts: Iterable<HealthReceipt>;
+//   daemonReceipt: Daemon;
+//   name: string;
+//   trigger?: Trigger;
+//   fn(): Promise<CheckResult> | CheckResult;
+//   onFirstSuccess?: () => () => Promise<unknown> | unknown;
+// }) {
+//   new Promise(async () => {
+//     const trigger = (o.trigger ?? defaultTrigger)();
+//     let currentValue: TriggerInput = {
+//       lastResult: null,
+//       hadSuccess: false,
+//     };
+//     for (
+//       let res = await trigger.next(currentValue);
+//       !res.done;
+//       res = await trigger.next(currentValue)
+//     ) {
+//       try {
+//         const { status, message } = await o.fn();
+//         if (!currentValue.hadSuccess) {
+//           await o.started(o?.onFirstSuccess ?? (() => o.daemonReceipt.term()));
+//         }
+//         await o.effects.setHealth({
+//           name: o.name,
+//           status,
+//           message,
+//         });
+//         currentValue.hadSuccess = true;
+//         currentValue.lastResult = "success";
+//       } catch (_) {
+//         currentValue.lastResult = "failure";
+//       }
+//     }
+//   });
+//   return readReciptOf({
+//     daemon: o.daemonReceipt,
+//   });
+// }