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package toxiproxy
import (
"encoding/binary"
"io"
"testing"
"github.com/Shopify/toxiproxy/stream"
"github.com/Shopify/toxiproxy/toxics"
)
func TestToxicsAreLoaded(t *testing.T) {
if toxics.Count() < 1 {
t.Fatal("No toxics loaded!")
}
}
func TestStubInitializaation(t *testing.T) {
collection := NewToxicCollection(nil)
link := NewToxicLink(nil, collection, stream.Downstream)
if len(link.stubs) != 1 {
t.Fatalf("Link created with wrong number of stubs: %d != 1", len(link.stubs))
} else if cap(link.stubs) != toxics.Count()+1 {
t.Fatalf("Link created with wrong capacity: %d != %d", cap(link.stubs), toxics.Count()+1)
} else if cap(link.stubs[0].Input) != 0 {
t.Fatalf("Noop buffer was not initialized as 0: %d", cap(link.stubs[0].Input))
} else if cap(link.stubs[0].Output) != 0 {
t.Fatalf("Link output buffer was not initialized as 0: %d", cap(link.stubs[0].Output))
}
}
func TestStubInitializaationWithToxics(t *testing.T) {
collection := NewToxicCollection(nil)
collection.chainAddToxic(&toxics.ToxicWrapper{
Toxic: new(toxics.LatencyToxic),
Type: "latency",
Direction: stream.Downstream,
BufferSize: 1024,
Toxicity: 1,
})
collection.chainAddToxic(&toxics.ToxicWrapper{
Toxic: new(toxics.BandwidthToxic),
Type: "bandwidth",
Direction: stream.Downstream,
Toxicity: 1,
})
link := NewToxicLink(nil, collection, stream.Downstream)
if len(link.stubs) != 3 {
t.Fatalf("Link created with wrong number of stubs: %d != 3", len(link.stubs))
} else if cap(link.stubs) != toxics.Count()+1 {
t.Fatalf("Link created with wrong capacity: %d != %d", cap(link.stubs), toxics.Count()+1)
} else if cap(link.stubs[len(link.stubs)-1].Output) != 0 {
t.Fatalf("Link output buffer was not initialized as 0: %d", cap(link.stubs[0].Output))
}
for i, toxic := range collection.chain[stream.Downstream] {
if cap(link.stubs[i].Input) != toxic.BufferSize {
t.Fatalf("%s buffer was not initialized as %d: %d", toxic.Type, toxic.BufferSize, cap(link.stubs[i].Input))
}
}
}
func TestAddRemoveStubs(t *testing.T) {
collection := NewToxicCollection(nil)
link := NewToxicLink(nil, collection, stream.Downstream)
go link.stubs[0].Run(collection.chain[stream.Downstream][0])
collection.links["test"] = link
// Add stubs
collection.chainAddToxic(&toxics.ToxicWrapper{
Toxic: new(toxics.LatencyToxic),
Type: "latency",
Direction: stream.Downstream,
BufferSize: 1024,
Toxicity: 1,
})
toxic := &toxics.ToxicWrapper{
Toxic: new(toxics.BandwidthToxic),
Type: "bandwidth",
Direction: stream.Downstream,
BufferSize: 2048,
Toxicity: 1,
}
collection.chainAddToxic(toxic)
if cap(link.stubs[len(link.stubs)-1].Output) != 0 {
t.Fatalf("Link output buffer was not initialized as 0: %d", cap(link.stubs[0].Output))
}
for i, toxic := range collection.chain[stream.Downstream] {
if cap(link.stubs[i].Input) != toxic.BufferSize {
t.Fatalf("%s buffer was not initialized as %d: %d", toxic.Type, toxic.BufferSize, cap(link.stubs[i].Input))
}
}
// Remove stubs
collection.chainRemoveToxic(toxic)
if cap(link.stubs[len(link.stubs)-1].Output) != 0 {
t.Fatalf("Link output buffer was not initialized as 0: %d", cap(link.stubs[0].Output))
}
for i, toxic := range collection.chain[stream.Downstream] {
if cap(link.stubs[i].Input) != toxic.BufferSize {
t.Fatalf("%s buffer was not initialized as %d: %d", toxic.Type, toxic.BufferSize, cap(link.stubs[i].Input))
}
}
}
func TestNoDataDropped(t *testing.T) {
collection := NewToxicCollection(nil)
link := NewToxicLink(nil, collection, stream.Downstream)
go link.stubs[0].Run(collection.chain[stream.Downstream][0])
collection.links["test"] = link
toxic := &toxics.ToxicWrapper{
Toxic: &toxics.LatencyToxic{
Latency: 1000,
},
Type: "latency",
Direction: stream.Downstream,
BufferSize: 1024,
Toxicity: 1,
}
done := make(chan struct{})
defer close(done)
go func() {
for i := 0; i < 64*1024; i++ {
buf := make([]byte, 2)
binary.BigEndian.PutUint16(buf, uint16(i))
link.input.Write(buf)
}
link.input.Close()
}()
go func() {
for {
select {
case <-done:
return
default:
collection.chainAddToxic(toxic)
collection.chainRemoveToxic(toxic)
}
}
}()
buf := make([]byte, 2)
for i := 0; i < 64*1024; i++ {
n, err := link.output.Read(buf)
if n != 2 || err != nil {
t.Fatalf("Read failed: %d %v", n, err)
} else {
val := binary.BigEndian.Uint16(buf)
if val != uint16(i) {
t.Fatalf("Read incorrect bytes: %v != %d", val, i)
}
}
}
n, err := link.output.Read(buf)
if n != 0 || err != io.EOF {
t.Fatalf("Expected EOF: %d %v", n, err)
}
}
func TestToxicity(t *testing.T) {
collection := NewToxicCollection(nil)
link := NewToxicLink(nil, collection, stream.Downstream)
go link.stubs[0].Run(collection.chain[stream.Downstream][0])
collection.links["test"] = link
toxic := &toxics.ToxicWrapper{
Toxic: new(toxics.TimeoutToxic),
Name: "timeout1",
Type: "timeout",
Direction: stream.Downstream,
Toxicity: 0,
}
collection.chainAddToxic(toxic)
// Toxic should be a Noop because of toxicity
n, err := link.input.Write([]byte{42})
if n != 1 || err != nil {
t.Fatalf("Write failed: %d %v", n, err)
}
buf := make([]byte, 2)
n, err = link.output.Read(buf)
if n != 1 || err != nil {
t.Fatalf("Read failed: %d %v", n, err)
} else if buf[0] != 42 {
t.Fatalf("Read wrong byte: %x", buf[0])
}
toxic.Toxicity = 1
toxic.Toxic.(*toxics.TimeoutToxic).Timeout = 100
collection.chainUpdateToxic(toxic)
// Toxic should timeout after 100ms
n, err = link.input.Write([]byte{42})
if n != 1 || err != nil {
t.Fatalf("Write failed: %d %v", n, err)
}
n, err = link.output.Read(buf)
if n != 0 || err != io.EOF {
t.Fatalf("Read did not get EOF: %d %v", n, err)
}
}
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