Distributor: append several tests for http parser. (#3416)

pkg/distributor/http_test.go

@@ -0,0 +1,87 @@
+package distributor
+
+import (
+	"bytes"
+	"compress/gzip"
+	"log"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// GZip source string and return compressed string
+func gzipString(source string) string {
+	var buf bytes.Buffer
+	zw := gzip.NewWriter(&buf)
+	if _, err := zw.Write([]byte(source)); err != nil {
+		log.Fatal(err)
+	}
+	if err := zw.Close(); err != nil {
+		log.Fatal(err)
+	}
+	return buf.String()
+}
+
+func TestParseRequest(t *testing.T) {
+	var tests = []struct {
+		path            string
+		body            string
+		contentType     string
+		contentEncoding string
+		valid           bool
+	}{
+		{
+			path:        `/loki/api/v1/push`,
+			body:        ``,
+			contentType: `application/json`,
+			valid:       false},
+		{
+			path:        `/loki/api/v1/push`,
+			body:        `{"streams": [{ "stream": { "foo": "bar2" }, "values": [ [ "1570818238000000000", "fizzbuzz" ] ] }]}`,
+			contentType: ``,
+			valid:       false},
+		{
+			path:        `/loki/api/v1/push`,
+			body:        `{"streams": [{ "stream": { "foo": "bar2" }, "values": [ [ "1570818238000000000", "fizzbuzz" ] ] }]}`,
+			contentType: `application/json`,
+			valid:       true},
+		{
+			path:            `/loki/api/v1/push`,
+			body:            `{"streams": [{ "stream": { "foo": "bar2" }, "values": [ [ "1570818238000000000", "fizzbuzz" ] ] }]}`,
+			contentType:     `application/json`,
+			contentEncoding: ``,
+			valid:           true},
+		{
+			path:            `/loki/api/v1/push`,
+			body:            gzipString(`{"streams": [{ "stream": { "foo": "bar2" }, "values": [ [ "1570818238000000000", "fizzbuzz" ] ] }]}`),
+			contentType:     `application/json`,
+			contentEncoding: `gzip`,
+			valid:           true},
+		{
+			path:            `/loki/api/v1/push`,
+			body:            gzipString(`{"streams": [{ "stream": { "foo": "bar2" }, "values": [ [ "1570818238000000000", "fizzbuzz" ] ] }]}`),
+			contentType:     `application/json`,
+			contentEncoding: `snappy`,
+			valid:           false}}
+
+	// Testing input array
+	for index, test := range tests {
+		request := httptest.NewRequest("POST", test.path, strings.NewReader(test.body))
+		if len(test.contentType) > 0 {
+			request.Header.Add("Content-Type", test.contentType)
+		}
+		if len(test.contentEncoding) > 0 {
+			request.Header.Add("Content-Encoding", test.contentEncoding)
+		}
+		data, err := ParseRequest(request)
+		if test.valid {
+			assert.Nil(t, err, "Should not give error for %d", index)
+			assert.NotNil(t, data, "Should give data for %d", index)
+		} else {
+			assert.NotNil(t, err, "Should give error for %d", index)
+			assert.Nil(t, data, "Should not give data for %d", index)
+		}
+	}
+}