chore(server): added functional flavour to error helpers

server/package.json

@@ -31,6 +31,7 @@
     "@types/jest": "26.0.22",
     "@types/morgan": "1.9.2",
     "@types/node": "14.14.37",
+    "@types/ramda": "0.27.40",
     "@types/supertest": "2.0.11",
     "@types/ws": "7.4.1",
     "@typescript-eslint/eslint-plugin": "4.21.0",

server/src/functors/IO.ts

@@ -0,0 +1,37 @@
+import { compose } from 'ramda'
+
+export class IO {
+	public unsafePerformIO: any
+
+	constructor(fn: any) {
+		this.unsafePerformIO = fn
+	}
+
+	// [util.inspect.custom]() {
+	// 	return 'IO(?)';
+	// }
+
+	// ----- Pointed IO
+	static of(x: any) {
+		return new IO(() => x)
+	}
+
+	// ----- Functor IO
+	map(fn: any) {
+		return new IO(compose(fn, this.unsafePerformIO))
+	}
+
+	// ----- Applicative IO
+	ap(f: any) {
+		return this.chain((fn: any) => f.map(fn))
+	}
+
+	// ----- Monad IO
+	chain(fn: any) {
+		return this.map(fn).join()
+	}
+
+	join() {
+		return new IO(() => this.unsafePerformIO().unsafePerformIO())
+	}
+}

server/src/helpers/errors.ts

@@ -1,5 +1,12 @@
-export const logError = (console: any) => (errorText: string) => console.error(`[deemix-server]: ${errorText}`)
+import { compose, concat, map } from 'ramda'
-export const consoleError = logError(console)
+import { IO } from '../functors/IO'
+
+export const consoleErrorIo = IO.of(console.error)
+
+const prependDeemix = concat('[deemix-server]: ')
+
+export const consoleError = (errorText: string) =>
+	map((fn: any) => compose(fn, prependDeemix)(errorText), consoleErrorIo)
 
 export class BadRequestError extends Error {
 	constructor() {

server/src/routes/api/get/getChartTracks.ts

@@ -2,7 +2,7 @@ import { RequestHandler } from 'express'
 import { ApiHandler } from '../../../types'
 import { dz } from '../../../main'
 import { isObjectEmpy } from '../../../helpers/primitive-checks'
-import { BadRequestError, consoleError, isBadRequestError } from '../../../helpers/errors'
+import { BadRequestError, isBadRequestError, consoleError } from '../../../helpers/errors'
 
 export interface RawChartTracksQuery {
 	id: string
@@ -27,7 +27,7 @@ const handler: RequestHandler<{}, {}, {}, RawChartTracksQuery> = async (req, res
 		next()
 	} catch (error) {
 		if (isBadRequestError(error)) {
-			consoleError(error.message)
+			consoleError(error.message).unsafePerformIO()
 			res.status(400).send()
 			return next()
 		}

server/yarn.lock

@@ -773,6 +773,13 @@
   resolved "https://registry.yarnpkg.com/@types/qs/-/qs-6.9.6.tgz#df9c3c8b31a247ec315e6996566be3171df4b3b1"
   integrity sha512-0/HnwIfW4ki2D8L8c9GVcG5I72s9jP5GSLVF0VIXDW00kmIpA6O33G7a8n59Tmh7Nz0WUC3rSb7PTY/sdW2JzA==
 
+"@types/ramda@0.27.40":
+  version "0.27.40"
+  resolved "https://registry.yarnpkg.com/@types/ramda/-/ramda-0.27.40.tgz#99f307356fe553095ee4d3c2af2b0eb3af7a8413"
+  integrity sha512-V99ZfTH2tqVYdLDAlgh2uT+N074HPgqnAsMjALKSBqogYd0HbuuGMqNukJ6fk9Ml/Htaus76fsc4Yh3p7q1VdQ==
+  dependencies:
+    ts-toolbelt "^6.15.1"
+
 "@types/range-parser@*":
   version "1.2.3"
   resolved "https://registry.yarnpkg.com/@types/range-parser/-/range-parser-1.2.3.tgz#7ee330ba7caafb98090bece86a5ee44115904c2c"
@@ -5921,6 +5928,11 @@ ts-node@9.1.1, ts-node@^9.0.0:
     source-map-support "^0.5.17"
     yn "3.1.1"
 
+ts-toolbelt@^6.15.1:
+  version "6.15.5"
+  resolved "https://registry.yarnpkg.com/ts-toolbelt/-/ts-toolbelt-6.15.5.tgz#cb3b43ed725cb63644782c64fbcad7d8f28c0a83"
+  integrity sha512-FZIXf1ksVyLcfr7M317jbB67XFJhOO1YqdTcuGaq9q5jLUoTikukZ+98TPjKiP2jC5CgmYdWWYs0s2nLSU0/1A==
+
 tsconfig-paths@^3.9.0:
   version "3.9.0"
   resolved "https://registry.yarnpkg.com/tsconfig-paths/-/tsconfig-paths-3.9.0.tgz#098547a6c4448807e8fcb8eae081064ee9a3c90b"