go-database-server

main.go

package main

import (
	"fmt"
	"strings"

	"net/http"
)

func sayHello(w http.ResponseWriter, req *http.Request) {
	fmt.Fprintf(w, "Hello!\n This webserver lets you store and retrieve data through query parameters at the end of the URL.\n To save data, use the set path, a question mark and then your key value pair separated by an equals sign. For example, http://localhost:4000/set?somekey=somevalue.\n To retrieve data, use the get path, a question mark, the word key, an equals sign and the name of the key. For example, http://localhost:4000/get?key=somekey.")
}

type query struct {
	key   string
	value string
}

var dataStore []query

func setValues(w http.ResponseWriter, r *http.Request) {
	var sessionStore query
	queryString := r.URL.RawQuery
	sessionStore.key = strings.Split(queryString, "=")[0]
	sessionStore.value = strings.Split(queryString, "=")[1]

	dataStore = append(dataStore, sessionStore)
	fmt.Fprintf(w, "key value pair saved!")
}

func getValues(w http.ResponseWriter, r *http.Request) {
	queryString := r.URL.RawQuery
	searchTerm := strings.Split(queryString, "=")[1]
	success := false

	for _, query := range dataStore {
		if searchTerm == query.key {
			success = true
			fmt.Fprintf(w, query.value)
		}
	}

	if !success {
		fmt.Fprintf(w, "No key value pair found.")
	}
}

func main() {

	helloHandler := http.HandlerFunc(sayHello)
	http.Handle("/", helloHandler)

	setValuesHandler := http.HandlerFunc(setValues)
	http.Handle("/set", setValuesHandler)

	getValuesHandler := http.HandlerFunc(getValues)
	http.Handle("/get", getValuesHandler)

	http.ListenAndServe(":4000", nil)
}

To run the webserver on your machine, download the file and run go run main.go