9 files changed, 158 insertions, 156 deletions

diff --git a/u/fn/either.ts b/u/fn/either.ts
index 124557c..bf90f16 100644
--- a/u/fn/either.ts
+++ b/u/fn/either.ts
@@ -4,115 +4,111 @@ type IEitherTag = "IEither";
 const iEitherTag: IEitherTag = "IEither";
 
 export interface _Either<LeftT, RightT, T> {
-    readonly isLeft: LeftT;
-    readonly isRight: RightT;
-    readonly value: T;
+  readonly isLeft: LeftT;
+  readonly isRight: RightT;
+  readonly value: T;
 }
 export type Left<E> = _Either<true, false, E>;
 export type Right<T> = _Either<false, true, T>;
 
 export interface IEither<E, T> {
-    readonly _tag: IEitherTag;
-
-    mapBoth: <_E, _T>(
-        errBranch: Mapper<E, _E>,
-        okBranch: Mapper<T, _T>,
-    ) => IEither<_E, _T>;
-    fold: <_T>(folder: Mapper<Left<E> | Right<T>, _T>) => _T;
-    moveRight: <_T>(t: _T) => IEither<E, _T>;
-    mapRight: <_T>(mapper: Mapper<T, _T>) => IEither<E, _T>;
-    mapLeft: <_E>(mapper: Mapper<E, _E>) => IEither<_E, T>;
-    flatMap: <_T>(mapper: Mapper<T, IEither<E, _T>>) => IEither<E, _T>;
-    flatMapAsync: <_T>(
-        mapper: Mapper<T, Promise<IEither<E, _T>>>,
-    ) => Promise<IEither<E, _T>>;
+  readonly _tag: IEitherTag;
+
+  mapBoth: <_E, _T>(
+    errBranch: Mapper<E, _E>,
+    okBranch: Mapper<T, _T>,
+  ) => IEither<_E, _T>;
+  fold: <_T>(folder: Mapper<Left<E> | Right<T>, _T>) => _T;
+  moveRight: <_T>(t: _T) => IEither<E, _T>;
+  mapRight: <_T>(mapper: Mapper<T, _T>) => IEither<E, _T>;
+  mapLeft: <_E>(mapper: Mapper<E, _E>) => IEither<_E, T>;
+  flatMap: <_T>(mapper: Mapper<T, IEither<E, _T>>) => IEither<E, _T>;
+  flatMapAsync: <_T>(
+    mapper: Mapper<T, Promise<IEither<E, _T>>>,
+  ) => Promise<IEither<E, _T>>;
 }
 
 export class Either<E, T> implements IEither<E, T> {
-    private readonly self: Left<E> | Right<T>;
-
-    private constructor(
-        err?: E,
-        ok?: T,
-        public readonly _tag: IEitherTag = iEitherTag,
-    ) {
-        this.self = <Left<E> | Right<T>>{
-            isLeft: typeof err !== "undefined",
-            isRight: typeof ok !== "undefined",
-            value: typeof err !== "undefined" ? err : ok!,
-        };
+  private readonly self: Left<E> | Right<T>;
+
+  private constructor(
+    err?: E,
+    ok?: T,
+    public readonly _tag: IEitherTag = iEitherTag,
+  ) {
+    this.self = <Left<E> | Right<T>>{
+      isLeft: typeof err !== "undefined",
+      isRight: typeof ok !== "undefined",
+      value: typeof err !== "undefined" ? err : ok!,
+    };
+  }
+
+  public moveRight<_T>(t: _T) {
+    return this.mapRight(() => t);
+  }
+
+  public fold<_T>(folder: Mapper<Left<E> | Right<T>, _T>): _T {
+    return folder(this.self);
+  }
+
+  public mapBoth<_E, _T>(
+    errBranch: Mapper<E, _E>,
+    okBranch: Mapper<T, _T>,
+  ): IEither<_E, _T> {
+    if (this.self.isLeft) return Either.left(errBranch(this.self.value));
+    return Either.right(okBranch(this.self.value));
+  }
+
+  public flatMap<_T>(mapper: Mapper<T, IEither<E, _T>>): IEither<E, _T> {
+    if (this.self.isRight) return mapper(this.self.value);
+    return Either.left<E, _T>(this.self.value);
+  }
+
+  public mapRight<_T>(mapper: Mapper<T, _T>): IEither<E, _T> {
+    if (this.self.isRight) return Either.right<E, _T>(mapper(this.self.value));
+    return Either.left<E, _T>(this.self.value);
+  }
+
+  public mapLeft<_E>(mapper: Mapper<E, _E>): IEither<_E, T> {
+    if (this.self.isLeft) return Either.left<_E, T>(mapper(this.self.value));
+    return Either.right<_E, T>(this.self.value);
+  }
+
+  public async flatMapAsync<_T>(
+    mapper: Mapper<T, Promise<IEither<E, _T>>>,
+  ): Promise<IEither<E, _T>> {
+    if (this.self.isLeft) {
+      return Promise.resolve(Either.left<E, _T>(this.self.value));
     }
-
-    public moveRight<_T>(t: _T) {
-        return this.mapRight(() => t);
-    }
-
-    public fold<_T>(folder: Mapper<Left<E> | Right<T>, _T>): _T {
-        return folder(this.self);
-    }
-
-    public mapBoth<_E, _T>(
-        errBranch: Mapper<E, _E>,
-        okBranch: Mapper<T, _T>,
-    ): IEither<_E, _T> {
-        if (this.self.isLeft) return Either.left(errBranch(this.self.value));
-        return Either.right(okBranch(this.self.value));
-    }
-
-    public flatMap<_T>(mapper: Mapper<T, IEither<E, _T>>): IEither<E, _T> {
-        if (this.self.isRight) return mapper(this.self.value);
-        return Either.left<E, _T>(this.self.value);
-    }
-
-    public mapRight<_T>(mapper: Mapper<T, _T>): IEither<E, _T> {
-        if (this.self.isRight)
-            return Either.right<E, _T>(mapper(this.self.value));
-        return Either.left<E, _T>(this.self.value);
-    }
-
-    public mapLeft<_E>(mapper: Mapper<E, _E>): IEither<_E, T> {
-        if (this.self.isLeft)
-            return Either.left<_E, T>(mapper(this.self.value));
-        return Either.right<_E, T>(this.self.value);
-    }
-
-    public async flatMapAsync<_T>(
-        mapper: Mapper<T, Promise<IEither<E, _T>>>,
-    ): Promise<IEither<E, _T>> {
-        if (this.self.isLeft) {
-            return Promise.resolve(Either.left<E, _T>(this.self.value));
-        }
-        return await mapper(this.self.value).catch((err) =>
-            Either.left<E, _T>(err),
-        );
-    }
-
-    static left<E, T>(e: E): IEither<E, T> {
-        return new Either<E, T>(e, undefined);
-    }
-    static right<E, T>(t: T): IEither<E, T> {
-        return new Either<E, T>(undefined, t);
-    }
-
-    static fromFailable<E, T>(s: Supplier<T>): IEither<E, T> {
-        try {
-            return Either.right<E, T>(s());
-        } catch (e) {
-            return Either.left<E, T>(e as E);
-        }
+    return await mapper(this.self.value).catch((err) =>
+      Either.left<E, _T>(err),
+    );
+  }
+
+  static left<E, T>(e: E): IEither<E, T> {
+    return new Either<E, T>(e, undefined);
+  }
+  static right<E, T>(t: T): IEither<E, T> {
+    return new Either<E, T>(undefined, t);
+  }
+
+  static fromFailable<E, T>(s: Supplier<T>): IEither<E, T> {
+    try {
+      return Either.right<E, T>(s());
+    } catch (e) {
+      return Either.left<E, T>(e as E);
     }
+  }
 
-    static async fromFailableAsync<E, T>(
-        s: Promise<T>,
-    ): Promise<IEither<E, T>> {
-        try {
-            return Either.right<E, T>(await s);
-        } catch (e) {
-            return Either.left<E, T>(e as E);
-        }
+  static async fromFailableAsync<E, T>(s: Promise<T>): Promise<IEither<E, T>> {
+    try {
+      return Either.right<E, T>(await s);
+    } catch (e) {
+      return Either.left<E, T>(e as E);
     }
+  }
 }
 
 export const isEither = <E, T>(o: unknown): o is IEither<E, T> => {
-    return isObject(o) && "_tag" in o && o._tag === "IEither";
+  return isObject(o) && "_tag" in o && o._tag === "IEither";
 };
diff --git a/u/process/argv.ts b/u/process/argv.ts
index 7190531..8e85477 100644
--- a/u/process/argv.ts
+++ b/u/process/argv.ts
@@ -37,11 +37,11 @@ export const argv = <K extends string, V extends string>(
     .map((arg) => [arg, getArg(arg, argv)] as [K, IEither<Error, V>])
     .map(([arg, specified]): [K, IEither<Error, V>] => [
       arg,
-      specified.fold(({ isLeft, isRight, value}): IEither<Error, V> => {
-          if (isRight) {
-              return Either.right(value);
-          }
-          const hasDefaultVal = isLeft && defaultArgs && arg in defaultArgs;
+      specified.fold(({ isLeft, isRight, value }): IEither<Error, V> => {
+        if (isRight) {
+          return Either.right(value);
+        }
+        const hasDefaultVal = isLeft && defaultArgs && arg in defaultArgs;
         if (hasDefaultVal) {
           return Either.right(defaultArgs[arg]!);
         }
diff --git a/u/server/activity/fourohfour.ts b/u/server/activity/fourohfour.ts
index ed8c7eb..33cfe5f 100644
--- a/u/server/activity/fourohfour.ts
+++ b/u/server/activity/fourohfour.ts
@@ -7,12 +7,13 @@ import {
 } from "@emprespresso/pengueno";
 
 const messages = [
-  "D: Meow-t found! Your API call ran away!",
-  "404-bidden! But like...in a cute way >:3 !",
-  ":o Your data went on a paw-sible vacation!",
+  "D: meow-t found! your api call ran away!",
+  "404-bidden! but like...in a cute way >:3 !",
+  ":< your data went on a paw-sible vacation!",
   "uwu~ not found, but found our hearts instead!",
 ];
-const randomFourOhFour = () => messages[Math.random() * messages.length];
+const randomFourOhFour = () =>
+  messages[Math.floor(Math.random() * messages.length)];
 
 export interface IFourOhFourActivity {
   fourOhFour: IActivity;
diff --git a/u/server/request.ts b/u/server/request.ts
index c857f88..5dd9d7b 100644
--- a/u/server/request.ts
+++ b/u/server/request.ts
@@ -1,4 +1,5 @@
-import { LogMetricTraceable } from "@emprespresso/pengueno";
+import { LogMetricTraceable, LogTraceable } from "@emprespresso/pengueno";
+import { TraceUtil } from "../trace/util.ts";
 
 const greetings = [
   "hewwo :D",
@@ -39,9 +40,11 @@ export class PenguenoRequest extends Request {
     const id = crypto.randomUUID();
     const url = new URL(request.url);
     const { pathname } = url;
-    const traceSupplier = () => `[${id} <- ${request.method}'d @ ${pathname}]`;
-    return LogMetricTraceable.from(
+    const logTraceable = LogTraceable.of(
       new PenguenoRequest(url, { ...request }, id, new Date()),
-    ).bimap((_request) => [_request.get(), traceSupplier]);
+    ).bimap(
+      TraceUtil.withTrace(`Id=${id} Method=${request.method} Path=${pathname}`),
+    );
+    return LogMetricTraceable.ofLogTraceable(logTraceable);
   }
 }
diff --git a/u/server/response.ts b/u/server/response.ts
index 4531157..629dbb5 100644
--- a/u/server/response.ts
+++ b/u/server/response.ts
@@ -28,12 +28,12 @@ const getResponse = (
   };
 };
 
-const ResponseCodeMetrics = [1, 2, 3, 4, 5].map((x) =>
+const ResponseCodeMetrics = [0, 1, 2, 3, 4, 5].map((x) =>
   Metric.fromName(`response.${x}xx`),
 );
 export const getResponseMetric = (status: number) => {
-  const index = Math.floor(status / 100) + 1;
-  return ResponseCodeMetrics[index] ?? ResponseCodeMetrics[5 - 1];
+  const index = Math.floor(status / 100);
+  return ResponseCodeMetrics[index] ?? ResponseCodeMetrics[5];
 };
 
 export class PenguenoResponse extends Response {
@@ -67,7 +67,9 @@ export class JsonResponse extends PenguenoResponse {
       super(
         req,
         JSON.stringify(
-          e.fold(({ isLeft, value }) => (isLeft ? { error: value } : { ok: value })),
+          e.fold(({ isLeft, value }) =>
+            isLeft ? { error: value } : { ok: value },
+          ),
         ),
         optsWithJsonContentType,
       );
diff --git a/u/trace/itrace.ts b/u/trace/itrace.ts
index ed707c5..35164b5 100644
--- a/u/trace/itrace.ts
+++ b/u/trace/itrace.ts
@@ -9,29 +9,29 @@ export interface ITrace<TraceWith> {
 }
 
 export type ITraceableTuple<T, TraceWith> = [T, BaseTraceWith | TraceWith];
-export type ITraceableMapper<T, U, TraceWith, W = ITraceable<T, TraceWith>> = (
+export type ITraceableMapper<T, _T, TraceWith, W = ITraceable<T, TraceWith>> = (
   w: W,
-) => U;
+) => _T;
 
 export interface ITraceable<T, Trace = BaseTraceWith> {
   readonly trace: ITrace<Trace>;
   get: Supplier<T>;
-  move: <U>(u: U) => ITraceable<U, Trace>;
-  map: <U>(mapper: ITraceableMapper<T, U, Trace>) => ITraceable<U, Trace>;
-  bimap: <U>(
+  move: <_T>(u: _T) => ITraceable<_T, Trace>;
+  map: <_T>(mapper: ITraceableMapper<T, _T, Trace>) => ITraceable<_T, Trace>;
+  bimap: <_T>(
     mapper: ITraceableMapper<
       T,
-      ITraceableTuple<U, Array<Trace> | Trace>,
+      ITraceableTuple<_T, Array<Trace> | Trace>,
       Trace
     >,
-  ) => ITraceable<U, Trace>;
+  ) => ITraceable<_T, Trace>;
   peek: (peek: ITraceableMapper<T, void, Trace>) => ITraceable<T, Trace>;
-  flatMap: <U>(
-    mapper: ITraceableMapper<T, ITraceable<U, Trace>, Trace>,
-  ) => ITraceable<U, Trace>;
-  flatMapAsync<U>(
-    mapper: ITraceableMapper<T, Promise<ITraceable<U, Trace>>, Trace>,
-  ): ITraceable<Promise<U>, Trace>;
+  flatMap: <_T>(
+    mapper: ITraceableMapper<T, ITraceable<_T, Trace>, Trace>,
+  ) => ITraceable<_T, Trace>;
+  flatMapAsync<_T>(
+    mapper: ITraceableMapper<T, Promise<ITraceable<_T, Trace>>, Trace>,
+  ): ITraceable<Promise<_T>, Trace>;
 }
 
 export class TraceableImpl<T, TraceWith> implements ITraceable<T, TraceWith> {
@@ -40,20 +40,20 @@ export class TraceableImpl<T, TraceWith> implements ITraceable<T, TraceWith> {
     public readonly trace: ITrace<TraceWith>,
   ) {}
 
-  public map<U>(mapper: ITraceableMapper<T, U, TraceWith>) {
+  public map<_T>(mapper: ITraceableMapper<T, _T, TraceWith>) {
     const result = mapper(this);
     return new TraceableImpl(result, this.trace);
   }
 
-  public flatMap<U>(
-    mapper: ITraceableMapper<T, ITraceable<U, TraceWith>, TraceWith>,
-  ): ITraceable<U, TraceWith> {
+  public flatMap<_T>(
+    mapper: ITraceableMapper<T, ITraceable<_T, TraceWith>, TraceWith>,
+  ): ITraceable<_T, TraceWith> {
     return mapper(this);
   }
 
-  public flatMapAsync<U>(
-    mapper: ITraceableMapper<T, Promise<ITraceable<U, TraceWith>>, TraceWith>,
-  ): ITraceable<Promise<U>, TraceWith> {
+  public flatMapAsync<_T>(
+    mapper: ITraceableMapper<T, Promise<ITraceable<_T, TraceWith>>, TraceWith>,
+  ): ITraceable<Promise<_T>, TraceWith> {
     return new TraceableImpl(
       mapper(this).then((t) => t.get()),
       this.trace,
@@ -65,14 +65,14 @@ export class TraceableImpl<T, TraceWith> implements ITraceable<T, TraceWith> {
     return this;
   }
 
-  public move<Tt>(t: Tt): ITraceable<Tt, TraceWith> {
+  public move<_T>(t: _T): ITraceable<_T, TraceWith> {
     return this.map(() => t);
   }
 
-  public bimap<U>(
+  public bimap<_T>(
     mapper: ITraceableMapper<
       T,
-      ITraceableTuple<U, Array<TraceWith> | TraceWith>,
+      ITraceableTuple<_T, Array<TraceWith> | TraceWith>,
       TraceWith
     >,
   ) {
diff --git a/u/trace/logger.ts b/u/trace/logger.ts
index 5890545..4f29839 100644
--- a/u/trace/logger.ts
+++ b/u/trace/logger.ts
@@ -95,8 +95,8 @@ export class LogTrace implements ITrace<LogTraceSupplier> {
             level: Math.max(logLevelOrder.indexOf(val), acc.level),
           };
         }
-        const prefix = [acc.line, val].join(" ");
-        return { ...acc, prefix };
+        const line = [acc.line, val].join(" ");
+        return { ...acc, line };
       },
       { line: "", level: -1 },
     );
diff --git a/u/trace/metrics.ts b/u/trace/metrics.ts
index 69322b9..822fc38 100644
--- a/u/trace/metrics.ts
+++ b/u/trace/metrics.ts
@@ -8,8 +8,8 @@ import {
 } from "@emprespresso/pengueno";
 
 export enum Unit {
-  COUNT,
-  MILLISECONDS,
+  COUNT = "COUNT",
+  MILLISECONDS = "MILLISECONDS",
 }
 
 export interface IMetric {
diff --git a/u/trace/trace.ts b/u/trace/trace.ts
index 03605c2..6cad5b0 100644
--- a/u/trace/trace.ts
+++ b/u/trace/trace.ts
@@ -1,6 +1,7 @@
 import {
   isMetricsTraceSupplier,
   type ITrace,
+  type ITraceable,
   type ITraceWith,
   LogTrace,
   type LogTraceSupplier,
@@ -12,16 +13,14 @@ import {
 
 export class LogTraceable<T> extends TraceableImpl<T, LogTraceSupplier> {
   public static LogTrace = new LogTrace();
-  static from<T>(t: T) {
+  static of<T>(t: T) {
     return new LogTraceable(t, LogTraceable.LogTrace);
   }
 }
 
 const getEmbeddedMetricConsumer =
-  (logTrace: LogTrace) => (metrics: Array<MetricValue>) =>
-    logTrace
-      .addTrace("<metrics>")
-      .trace(JSON.stringify(metrics, null, 2) + "</metrics>");
+  (logTrace: ITrace<LogTraceSupplier>) => (metrics: Array<MetricValue>) =>
+    logTrace.trace(`<metrics>${JSON.stringify(metrics, null)}</metrics>`);
 export class EmbeddedMetricsTraceable<T> extends TraceableImpl<
   T,
   MetricsTraceSupplier
@@ -30,11 +29,8 @@ export class EmbeddedMetricsTraceable<T> extends TraceableImpl<
     getEmbeddedMetricConsumer(LogTraceable.LogTrace),
   );
 
-  static from<T>(t: T) {
-    return new EmbeddedMetricsTraceable(
-      t,
-      EmbeddedMetricsTraceable.MetricsTrace,
-    );
+  static of<T>(t: T, metricsTrace = EmbeddedMetricsTraceable.MetricsTrace) {
+    return new EmbeddedMetricsTraceable(t, metricsTrace);
   }
 }
 
@@ -72,12 +68,16 @@ export class LogMetricTraceable<T> extends TraceableImpl<
   T,
   MetricsTraceSupplier | LogTraceSupplier
 > {
-  public static LogMetricTrace = new LogMetricTrace(
-    LogTraceable.LogTrace,
-    EmbeddedMetricsTraceable.MetricsTrace,
-  );
+  static ofLogTraceable<T>(t: ITraceable<T, LogTraceSupplier>) {
+    const metricsTrace = new MetricsTrace(getEmbeddedMetricConsumer(t.trace));
+    return new LogMetricTraceable(
+      t.get(),
+      new LogMetricTrace(t.trace, metricsTrace),
+    );
+  }
 
-  static from<T>(t: T) {
-    return new LogMetricTraceable(t, LogMetricTraceable.LogMetricTrace);
+  static of<T>(t: T) {
+    const logTrace = LogTraceable.of(t);
+    return LogMetricTraceable.ofLogTraceable(logTrace);
   }
 }