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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package memnet
import (
"errors"
"fmt"
"os"
"testing"
"time"
)
func TestPipeHello(t *testing.T) {
p := NewPipe("p1", 1<<16)
msg := "Hello, World!"
if n, err := p.Write([]byte(msg)); err != nil {
t.Fatal(err)
} else if n != len(msg) {
t.Errorf("p.Write(%q) n=%d, want %d", msg, n, len(msg))
}
b := make([]byte, len(msg))
if n, err := p.Read(b); err != nil {
t.Fatal(err)
} else if n != len(b) {
t.Errorf("p.Read(%q) n=%d, want %d", string(b[:n]), n, len(b))
}
if got := string(b); got != msg {
t.Errorf("p.Read: %q, want %q", got, msg)
}
}
func TestPipeTimeout(t *testing.T) {
t.Run("write", func(t *testing.T) {
p := NewPipe("p1", 1<<16)
p.SetWriteDeadline(time.Now().Add(-1 * time.Second))
n, err := p.Write([]byte{'h'})
if !errors.Is(err, os.ErrDeadlineExceeded) {
t.Errorf("missing write timeout got err: %v", err)
}
if n != 0 {
t.Errorf("n=%d on timeout", n)
}
})
t.Run("read", func(t *testing.T) {
p := NewPipe("p1", 1<<16)
p.Write([]byte{'h'})
p.SetReadDeadline(time.Now().Add(-1 * time.Second))
b := make([]byte, 1)
n, err := p.Read(b)
if !errors.Is(err, os.ErrDeadlineExceeded) {
t.Errorf("missing read timeout got err: %v", err)
}
if n != 0 {
t.Errorf("n=%d on timeout", n)
}
})
t.Run("block-write", func(t *testing.T) {
p := NewPipe("p1", 1<<16)
p.SetWriteDeadline(time.Now().Add(10 * time.Millisecond))
if err := p.Block(); err != nil {
t.Fatal(err)
}
if _, err := p.Write([]byte{'h'}); !errors.Is(err, os.ErrDeadlineExceeded) {
t.Fatalf("want write timeout got: %v", err)
}
})
t.Run("block-read", func(t *testing.T) {
p := NewPipe("p1", 1<<16)
p.Write([]byte{'h', 'i'})
p.SetReadDeadline(time.Now().Add(10 * time.Millisecond))
b := make([]byte, 1)
if err := p.Block(); err != nil {
t.Fatal(err)
}
if _, err := p.Read(b); !errors.Is(err, os.ErrDeadlineExceeded) {
t.Fatalf("want read timeout got: %v", err)
}
})
}
func TestLimit(t *testing.T) {
p := NewPipe("p1", 1)
errCh := make(chan error)
go func() {
n, err := p.Write([]byte{'a', 'b', 'c'})
if err != nil {
errCh <- err
} else if n != 3 {
errCh <- fmt.Errorf("p.Write n=%d, want 3", n)
} else {
errCh <- nil
}
}()
b := make([]byte, 3)
if n, err := p.Read(b); err != nil {
t.Fatal(err)
} else if n != 1 {
t.Errorf("Read(%q): n=%d want 1", string(b), n)
}
if n, err := p.Read(b); err != nil {
t.Fatal(err)
} else if n != 1 {
t.Errorf("Read(%q): n=%d want 1", string(b), n)
}
if n, err := p.Read(b); err != nil {
t.Fatal(err)
} else if n != 1 {
t.Errorf("Read(%q): n=%d want 1", string(b), n)
}
if err := <-errCh; err != nil {
t.Error(err)
}
}
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