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|
package streamrpc
import (
"io"
"io/ioutil"
"net"
"os"
"strings"
"syscall"
"testing"
"time"
"github.com/stretchr/testify/require"
)
func TestSendFrame(t *testing.T) {
largeString := strings.Repeat("x", 0xfffff)
testCases := []struct {
desc string
in string
out string
err error
}{
{desc: "empty", out: "\x00\x00\x00\x00"},
{desc: "not empty", in: "hello", out: "\x00\x00\x00\x05hello"},
{desc: "very large", in: largeString, out: "\x00\x0f\xff\xff" + largeString},
{desc: "too large", in: "z" + largeString, err: errFrameTooLarge},
}
type result struct {
data string
err error
}
for _, tc := range testCases {
t.Run(tc.desc, func(t *testing.T) {
client, server := socketPair(t)
ch := make(chan result, 1)
go func() {
out, err := ioutil.ReadAll(server)
ch <- result{data: string(out), err: err}
}()
err := sendFrame(client, []byte(tc.in), time.Now().Add(10*time.Second))
if tc.err != nil {
require.Equal(t, tc.err, err)
return
}
require.NoError(t, err)
require.NoError(t, client.Close())
res := <-ch
require.NoError(t, res.err)
require.Equal(t, tc.out, res.data)
})
}
}
func TestSendFrame_timeout(t *testing.T) {
client, _ := socketPair(t)
// Ensure frame is bigger than write buffer, so that sendFrame will
// block. Otherwise we cannot observe the timeout behavior.
frame := make([]byte, 10*1024)
require.NoError(t, client.(*net.UnixConn).SetWriteBuffer(1024))
err := sendFrame(client, frame, time.Now())
require.ErrorIs(t, err, os.ErrDeadlineExceeded)
}
func TestRecvFrame(t *testing.T) {
largeString := strings.Repeat("x", 0xfffff)
testCases := []struct {
desc string
out string
in string
err error
}{
{desc: "empty", in: "\x00\x00\x00\x00", out: ""},
{desc: "not empty", in: "\x00\x00\x00\x05hello", out: "hello"},
{desc: "very large", in: "\x00\x0f\xff\xff" + largeString, out: largeString},
{desc: "too large", in: "\x00\x10\x00\x00" + "z" + largeString, err: errFrameTooLarge},
}
for _, tc := range testCases {
t.Run(tc.desc, func(t *testing.T) {
client, server := socketPair(t)
ch := make(chan error, 1)
go func() {
ch <- func() error {
n, err := server.Write([]byte(tc.in))
if n != len(tc.in) {
return io.ErrShortWrite
}
return err
}()
}()
out, err := recvFrame(client, time.Now().Add(10*time.Second))
if tc.err != nil {
require.Equal(t, tc.err, err)
return
}
require.NoError(t, err)
require.Equal(t, tc.out, string(out))
require.NoError(t, <-ch)
})
}
}
func TestRecvFrame_timeout(t *testing.T) {
client, _ := socketPair(t)
_, err := recvFrame(client, time.Now())
require.ErrorIs(t, err, os.ErrDeadlineExceeded)
}
func socketPair(t *testing.T) (net.Conn, net.Conn) {
t.Helper()
fds, err := syscall.Socketpair(syscall.AF_UNIX, syscall.SOCK_STREAM, 0)
require.NoError(t, err)
conns := make([]net.Conn, 2)
for i, fd := range fds[:] {
f := os.NewFile(uintptr(fd), "socket pair")
c, err := net.FileConn(f)
require.NoError(t, err)
require.NoError(t, f.Close())
t.Cleanup(func() { c.Close() })
conns[i] = c
}
return conns[0], conns[1]
}
|
