[TASK] add http io

http/io.go

@@ -0,0 +1,30 @@
+// Package that provides the logic of the webserver
+package http
+
+import (
+	"encoding/json"
+	"errors"
+	"net/http"
+	"strings"
+)
+
+// Function to read data from a http request via json format (input)
+func Read(r *http.Request, to interface{}) (err error) {
+	if !strings.Contains(r.Header.Get("Content-Type"), "application/json") {
+		err = errors.New("no json request recieved")
+		return
+	}
+	err = json.NewDecoder(r.Body).Decode(to)
+	return
+}
+
+// Function to write data as json to a http response (output)
+func Write(w http.ResponseWriter, data interface{}) {
+	js, err := json.Marshal(data)
+	if err != nil {
+		http.Error(w, "failed to encode response: "+err.Error(), http.StatusInternalServerError)
+		return
+	}
+	w.Header().Set("Content-Type", "application/json")
+	w.Write(js)
+}

http/io_test.go

@@ -0,0 +1,53 @@
+// Package that provides the logic of the webserver
+package http
+
+import (
+	"bytes"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// Function to test write()
+func TestWrite(t *testing.T) {
+	assert := assert.New(t)
+
+	w := httptest.NewRecorder()
+	from := map[string]string{"a": "b"}
+	Write(w, from)
+	result := w.Result()
+
+	assert.Equal([]string{"application/json"}, result.Header["Content-Type"], "no header information")
+	buf := new(bytes.Buffer)
+	buf.ReadFrom(result.Body)
+	to := buf.String()
+	assert.Equal("{\"a\":\"b\"}", to, "wrong content")
+
+	w = httptest.NewRecorder()
+	value := make(chan int)
+	Write(w, value)
+	result = w.Result()
+
+	assert.Equal(http.StatusInternalServerError, result.StatusCode, "wrong statuscode")
+
+}
+
+// Function to test read()
+func TestRead(t *testing.T) {
+	assert := assert.New(t)
+
+	to := make(map[string]string)
+	r, _ := http.NewRequest("GET", "/a", strings.NewReader("{\"a\":\"b\"}"))
+
+	r.Header["Content-Type"] = []string{"application/json"}
+	err := Read(r, &to)
+	assert.NoError(err, "no error")
+	assert.Equal(map[string]string{"a": "b"}, to, "wrong content")
+
+	r.Header["Content-Type"] = []string{""}
+	err = Read(r, &to)
+	assert.Error(err, "no error")
+}