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stream_test.go
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stream_test.go
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package shoutcast
import (
"io"
"math"
"net/http"
"net/http/httptest"
"reflect"
"testing"
)
func assertStrings(t *testing.T, got, want string) {
t.Helper()
if got != want {
t.Errorf("got %q, want %q", got, want)
}
}
func assertEqual(t *testing.T, got, want interface{}) bool {
t.Helper()
if !reflect.DeepEqual(got, want) {
t.Errorf("got %+v, want %+v", got, want)
return false
}
return true
}
func assertNoError(t *testing.T, err error) bool {
t.Helper()
if err != nil {
t.Errorf("Received unexpected error:\n%+v", err)
return false
}
return true
}
func requireNoError(t *testing.T, err error) {
t.Helper()
if !assertNoError(t, err) {
t.FailNow()
}
}
func assertError(t *testing.T, err error) bool {
t.Helper()
if err == nil {
t.Error("An error is expected but got nil.")
return false
}
return true
}
func makeMetadata(s string) []byte {
// needs to be a multiple of 16
msize := byte(math.Ceil(float64(len(s)) / 16.0))
buf := make([]byte, 16*msize+1, 16*msize+1)
buf[0] = msize
copy(buf[1:], s)
return buf
}
// insertMetadata inserts `metadata` into `data` every `n` bytes
func insertMetadata(data []byte, metadata []byte, n int) []byte {
numMetadata := int(math.Ceil(float64(len(data) / n)))
bufSize := len(metadata)*numMetadata + len(data)
buf := make([]byte, bufSize)
for i, j := 0, 0; i < len(data); i = i + n {
dataStart := i
dataEnd := i + n
if dataEnd >= len(data) {
dataEnd = len(data)
}
bufStart := j * (len(metadata) + n)
bufEnd := bufStart + (dataEnd - dataStart)
copy(buf[bufStart:bufEnd], data[dataStart:dataEnd])
copy(buf[bufEnd:], metadata)
j++
}
return buf
}
func TestRequiredHTTPHeadersArePresent(t *testing.T) {
var headers http.Header
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
headers = r.Header
}))
defer ts.Close()
Open(ts.URL)
assertStrings(t, headers.Get("icy-metadata"), "1")
assertStrings(t, headers.Get("user-agent")[:6], "iTunes")
}
func TestMissingBitrate(t *testing.T) {
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header()["icy-metaint"] = []string{"100"}
w.WriteHeader(200)
}))
_, err := Open(ts.URL)
assertNoError(t, err)
}
func TestUnexpectedEOF(t *testing.T) {
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("icy-br", "192")
w.Header().Set("icy-metaint", "1")
metadata := makeMetadata("SongTitle='Prospa Prayer';")
stream := insertMetadata([]byte{1, 1}, metadata, 1)
// unexpected EOF in the middle of a metadata block
w.Write(stream[:len(stream)-10])
}))
defer ts.Close()
s, _ := Open(ts.URL)
b1 := make([]byte, 1)
n, err := s.Read(b1)
if assertNoError(t, err) && assertEqual(t, 1, n) {
assertEqual(t, []byte{1}, b1)
}
// The metadata is read immediately and does not fit into the buffer.
// -> `0, nil` is returned.
// Filling the buffer after the reading of the metadata would be more complexity without advantage.
n, err = s.Read(b1)
assertNoError(t, err)
assertEqual(t, 0, n)
b2 := make([]byte, 1)
n, err = s.Read(b2)
if assertNoError(t, err) && assertEqual(t, 1, n) {
assertEqual(t, []byte{1}, b2)
}
// oops, nothing to read
b3 := make([]byte, 1)
n, err = s.Read(b3)
assertEqual(t, 0, n)
if assertError(t, err) {
assertEqual(t, io.ErrUnexpectedEOF, err)
}
}
func TestMetaintEqualsClientBufferLength(t *testing.T) {
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("icy-br", "192")
w.Header().Set("icy-metaint", "2")
metadata := makeMetadata("SongTitle='Prospa Prayer';")
stream := insertMetadata([]byte{1, 1, 1, 1, 1, 1}, metadata, 2)
w.Write(stream)
}))
defer ts.Close()
s, _ := Open(ts.URL)
b1 := make([]byte, 2)
n, err := s.Read(b1)
if assertNoError(t, err) && assertEqual(t, 2, n) {
assertEqual(t, []byte{1, 1}, b1)
}
// The metadata is read immediately and does not fit into the buffer.
// -> `0, nil` is returned.
// Filling the buffer after the reading of the metadata would be more complexity without advantage.
n, err = s.Read(b1)
assertNoError(t, err)
assertEqual(t, 0, n)
b2 := make([]byte, 2)
n, err = s.Read(b2)
if assertNoError(t, err) && assertEqual(t, 2, n) {
assertEqual(t, []byte{1, 1}, b2)
}
// no data except metadata read, again
n, err = s.Read(b2)
assertNoError(t, err)
assertEqual(t, 0, n)
b3 := make([]byte, 2)
n, err = s.Read(b3)
if assertNoError(t, err) && assertEqual(t, 2, n) {
assertEqual(t, []byte{1, 1}, b3)
}
// check for EOF
n, err = s.Read(b1)
assertEqual(t, 0, n)
if assertError(t, err) {
assertEqual(t, io.EOF, err)
}
}
func TestMetaintGreaterThanClientBufferLength(t *testing.T) {
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("icy-br", "192")
w.Header().Set("icy-metaint", "3")
metadata := makeMetadata("SongTitle='Prospa Prayer';")
stream := insertMetadata([]byte{1, 1, 1, 1, 1, 1}, metadata, 3)
w.Write(stream)
}))
defer ts.Close()
s, _ := Open(ts.URL)
b1 := make([]byte, 2)
n, err := s.Read(b1)
if assertNoError(t, err) && assertEqual(t, 2, n) {
assertEqual(t, []byte{1, 1}, b1)
}
// only one byte read then follows metadata
b2 := make([]byte, 2)
n, err = s.Read(b2)
if assertNoError(t, err) && assertEqual(t, 1, n) {
// don't assert the second byte, only one read
assertEqual(t, []byte{1}, b2[:1])
}
b3 := make([]byte, 2)
n, err = s.Read(b3)
if assertNoError(t, err) && assertEqual(t, 2, n) {
assertEqual(t, []byte{1, 1}, b3)
}
// only one byte read then follows metadata and then EOF
b4 := make([]byte, 2)
n, err = s.Read(b4)
if assertEqual(t, 1, n) {
// don't assert the second byte, only one read
assertEqual(t, []byte{1}, b4[:1])
}
if assertError(t, err) {
assertEqual(t, io.EOF, err)
}
}
func TestClientBufferLargeEnoughForMetadata(t *testing.T) {
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("icy-br", "192")
w.Header().Set("icy-metaint", "3")
metadata := makeMetadata("SongTitle='Prospa Prayer';")
stream := insertMetadata([]byte{3, 4, 5, 6, 7, 8, 9}, metadata, 3)
w.Write(stream)
}))
defer ts.Close()
s, err := Open(ts.URL)
requireNoError(t, err)
// metadata length is 33 (2*16+1) -> 38 - 33 = 5 bytes stream data to be read
b1 := make([]byte, 38)
n, err := s.Read(b1)
if assertNoError(t, err) && assertEqual(t, 5, n) {
assertEqual(t, []byte{3, 4, 5, 6, 7}, b1[:5])
}
b2 := make([]byte, 38)
n, err = s.Read(b2)
if assertEqual(t, 2, n) {
assertEqual(t, []byte{8, 9}, b2[:2])
}
if assertError(t, err) {
assertEqual(t, io.EOF, err)
}
}
func TestClientBufferLargeEnoughForTwoTimesMetadata(t *testing.T) {
ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("icy-br", "192")
w.Header().Set("icy-metaint", "3")
metadata := makeMetadata("SongTitle='Prospa Prayer';")
stream := insertMetadata([]byte{3, 4, 5, 6, 7, 8, 9, 10}, metadata, 3)
w.Write(stream)
}))
defer ts.Close()
s, err := Open(ts.URL)
requireNoError(t, err)
// metadata length is 33 (2*16+1) -> 73 - 2 * 33 = 7
b1 := make([]byte, 73)
n, err := s.Read(b1)
if assertNoError(t, err) && assertEqual(t, 7, n) {
assertEqual(t, []byte{3, 4, 5, 6, 7, 8, 9}, b1[:7])
}
b2 := make([]byte, 38)
n, err = s.Read(b2)
if assertEqual(t, 1, n) {
assertEqual(t, []byte{10}, b2[:1])
}
if assertError(t, err) {
assertEqual(t, io.EOF, err)
}
}
// test for EOF
// test for read on closed socket