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watchutil_test.go
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watchutil_test.go
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// Copyright Envoy Gateway Authors
// SPDX-License-Identifier: Apache-2.0
// The full text of the Apache license is available in the LICENSE file at
// the root of the repo.
package message_test
import (
"context"
"testing"
"time"
"github.com/stretchr/testify/assert"
"github.com/telepresenceio/watchable"
"github.com/envoyproxy/gateway/internal/ir"
"github.com/envoyproxy/gateway/internal/message"
)
func TestHandleSubscriptionAlreadyClosed(t *testing.T) {
ch := make(chan watchable.Snapshot[string, any])
close(ch)
var calls int
message.HandleSubscription[string, any](
message.Metadata{Runner: "demo", Message: "demo"},
ch,
func(update message.Update[string, any], errChans chan error) { calls++ },
)
assert.Equal(t, 0, calls)
}
func TestHandleSubscriptionAlreadyInitialized(t *testing.T) {
var m watchable.Map[string, any]
m.Store("foo", "bar")
endCtx, end := context.WithCancel(context.Background())
go func() {
<-endCtx.Done()
m.Store("baz", "qux")
m.Delete("qux") // no-op
m.Store("foo", "bar") // no-op
m.Delete("baz")
time.Sleep(100 * time.Millisecond)
m.Close()
}()
var storeCalls int
var deleteCalls int
message.HandleSubscription[string, any](
message.Metadata{Runner: "demo", Message: "demo"},
m.Subscribe(context.Background()),
func(update message.Update[string, any], errChans chan error) {
end()
if update.Delete {
deleteCalls++
} else {
storeCalls++
}
},
)
assert.Equal(t, 2, storeCalls)
assert.Equal(t, 1, deleteCalls)
}
func TestXdsIRUpdates(t *testing.T) {
tests := []struct {
desc string
xx []*ir.Xds
updates int
}{
{
desc: "HTTP listener order change skips update",
xx: []*ir.Xds{
{
HTTP: []*ir.HTTPListener{
{CoreListenerDetails: ir.CoreListenerDetails{Name: "listener-1"}},
{CoreListenerDetails: ir.CoreListenerDetails{Name: "listener-2"}},
},
},
{
HTTP: []*ir.HTTPListener{
{CoreListenerDetails: ir.CoreListenerDetails{Name: "listener-2"}},
{CoreListenerDetails: ir.CoreListenerDetails{Name: "listener-1"}},
},
},
},
updates: 1,
},
{
desc: "Additional HTTP listener triggers update",
xx: []*ir.Xds{
{
HTTP: []*ir.HTTPListener{
{CoreListenerDetails: ir.CoreListenerDetails{Name: "listener-1"}},
},
},
{
HTTP: []*ir.HTTPListener{
{CoreListenerDetails: ir.CoreListenerDetails{Name: "listener-1"}},
{CoreListenerDetails: ir.CoreListenerDetails{Name: "listener-2"}},
},
},
},
updates: 2,
},
}
for _, tc := range tests {
t.Run(tc.desc, func(t *testing.T) {
ctx := context.Background()
m := new(message.XdsIR)
snapshotC := m.Subscribe(ctx)
endCtx, end := context.WithCancel(ctx)
m.Store("start", &ir.Xds{})
go func() {
<-endCtx.Done()
for _, x := range tc.xx {
m.Store("test", x)
}
m.Store("end", &ir.Xds{})
}()
updates := 0
message.HandleSubscription(message.Metadata{Runner: "demo", Message: "demo"}, snapshotC, func(u message.Update[string, *ir.Xds], errChans chan error) {
end()
if u.Key == "test" {
updates += 1
}
if u.Key == "end" {
m.Close()
}
})
assert.Equal(t, tc.updates, updates)
})
}
}