basic structure of REST app implemented

api_exchange.go

+package exchangeserve
+
+import (
+	"net/http"
+)
+
+// HandlerHistory main handler for route related to `/student` requests
+func HandlerHistory() func (http.ResponseWriter, *http.Request) {
+
+	return func(w http.ResponseWriter, r *http.Request) {
+		switch r.Method {
+		case http.MethodGet:
+			handleHistoryGet(w, r)
+		case http.MethodPost:
+			http.Error(w, "Not implemented", http.StatusNotImplemented)
+		case http.MethodPut:
+			http.Error(w, "Not implemented", http.StatusNotImplemented)
+		case http.MethodDelete:
+			http.Error(w, "Not implemented", http.StatusNotImplemented)
+		}
+
+	}
+}
+
+// handleHistoryGet utility function, package level, to handle GET request to history route
+func handleHistoryGet(w http.ResponseWriter, r *http.Request) {
+	http.Header.Add(w.Header(), "content-type", "application/json")
+	/*
+	parts := strings.Split(r.URL.Path, "/")
+	// error handling
+	if len(parts) != 3 || parts[1] != "student" {
+		http.Error(w, "Malformed URL", http.StatusBadRequest)
+		return
+	}
+
+	// handle the request /student/  which will return ALL students as array of JSON objects
+	if parts[2] == "" {
+		replyWithAllStudents(w, db)
+	} else {
+		replyWithStudent(w, db, parts[2])
+	}
+	*/
+}
\ No newline at end of file

cmd/exchange_server.go

+package main
+
+import (
+	"fmt"
+	"html"
+	"log"
+	"net/http"
+	"os"
+
+	"github.com/go-chi/chi"
+	"github.com/go-chi/chi/middleware"
+)
+
+
+func main() {
+	port := os.Getenv("PORT")
+
+	if port == "" {
+		log.Fatal("$PORT must be set")
+	}
+
+	// Define new router
+	r := chi.NewRouter()
+	// Logs the start and end of each request with the elapsed processing time
+	r.Use(middleware.Logger)
+
+	r.Get("/exchange/v1/exchangehistory/")
+	r.Get("/exchange/v1/exchangeborder/")
+	r.Get("/exchange/v1/diag/")
+
+	log.Fatal(http.ListenAndServe(":"+port, r))
+}
\ No newline at end of file

country.go

+package exchangeserve
+
+import (
+	"github.com/alediaferia/gocountries"
+)
+
+/*
+GetCurrency returns a string of specified Country's currency code e.g.(NOK, USD, EUR...)
+*/
+func GetCurrency(countryName string) (string, error) {
+	// Query for structs of possible countries
+	countries, err := gocountries.CountriesByName(countryName)
+	// Extract first country
+	country := (countries)[0]
+	// Extract currency code
+	currencyCode := country.Currencies[0]
+	return currencyCode, err
+}

currency.go

+package exchangeserve
+
+
+
+/*
+GetHistory returns a map of a decoded json object with
+specified country's history of exchange rates based on date specified.
+*/
+func GetCurrenc(countryName, datePeriod string) ()
+resp, err := http.Get("http://example.com/")
\ No newline at end of file

go.mod

+module exchangeserve
+
+// +heroku goVersion go1.13
+
+go 1.13
+
+require (
+	github.com/alediaferia/gocountries v0.0.0-20150710192521-aaf4e81715ec
+	github.com/go-chi/chi v1.5.3
+)

go.sum

+github.com/alediaferia/gocountries v0.0.0-20150710192521-aaf4e81715ec h1:MpKw0dVqG6j9+V3dnmjIOzzL1dI4BFcE8x1IxcIblVQ=
+github.com/alediaferia/gocountries v0.0.0-20150710192521-aaf4e81715ec/go.mod h1:09hXhYnr/5zMJyMd5xTdVc/FIbC04dOLHnDshIwW2Cs=
+github.com/go-chi/chi v1.5.3 h1:+DVDS9/D3MTbEu3WrrH3oz9oP6PlSPSNj8LLw3X17yU=
+github.com/go-chi/chi v1.5.3/go.mod h1:Q8xfe6s3fjZyMr8ZTv5jL+vxhVaFyCq2s+RvSfzTD0E=

procfile

+web: exchangeserve
\ No newline at end of file