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watch_test.go
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watch_test.go
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package main
import (
"testing"
"time"
"github.com/hashicorp/consul/api"
"github.com/hashicorp/consul/consul/structs"
"github.com/hashicorp/consul/testutil"
)
const testServiceName = "redis"
const testNodeCheckName = "memory usage"
// A special test handler that does nothing but send the alert to a channel
type testHandler struct {
alerts chan *AlertState
}
func (t testHandler) Alert(datacenter string, alert *AlertState) {
t.alerts <- alert
}
// Create a test Consul server and a client for making calls to it
func testConsul(t *testing.T) (*api.Client, *testutil.TestServer) {
server := testutil.NewTestServer(t)
config := api.DefaultConfig()
config.Address = server.HTTPAddr
client, err := api.NewClient(config)
if err != nil {
t.Fatal(err)
}
return client, server
}
// The basic flow of a service becoming unhealthy and then recovering
func TestWatch_alertService(t *testing.T) {
client, server := testConsul(t)
defer server.Stop()
// Add a service with passing health
server.AddService(testServiceName, structs.HealthPassing, nil)
config, alertCh := testAlertConfig()
go watch(&WatchOptions{
service: testServiceName,
client: client,
config: config,
})
<-time.After(1 * time.Second)
// Change service health to critical
server.AddService(testServiceName, structs.HealthCritical, nil)
select {
case alert := <-alertCh:
if alert.Status != structs.HealthCritical {
t.Fatalf("expected alert on status %s, got %s", structs.HealthCritical, alert.Status)
}
case <-time.After(5 * time.Second):
t.Fatal("didn't get alert within the timeout")
}
// Set service back to passing health
server.AddService(testServiceName, structs.HealthPassing, nil)
select {
case alert := <-alertCh:
if alert.Status != structs.HealthPassing {
t.Fatalf("expected alert on status %s, got %s", structs.HealthPassing, alert.Status)
}
case <-time.After(5 * time.Second):
t.Fatal("didn't get alert within the timeout")
}
}
// The basic flow of a node becoming unhealthy and then recovering
func TestWatch_alertNode(t *testing.T) {
client, server := testConsul(t)
defer server.Stop()
// Create a node check
server.AddCheck(testNodeCheckName, "", structs.HealthPassing)
config, alertCh := testAlertConfig()
go watch(&WatchOptions{
node: server.Config.NodeName,
client: client,
config: config,
})
<-time.After(1 * time.Second)
// Change check health to critical
server.AddCheck(testNodeCheckName, "", structs.HealthCritical)
select {
case alert := <-alertCh:
if alert.Status != structs.HealthCritical {
t.Fatalf("expected alert on status %s, got %s", structs.HealthCritical, alert.Status)
}
case <-time.After(5 * time.Second):
t.Fatal("didn't get alert within the timeout")
}
// Set check back to passing
server.AddCheck(testNodeCheckName, "", structs.HealthPassing)
select {
case alert := <-alertCh:
if alert.Status != structs.HealthPassing {
t.Fatalf("expected alert on status %s, got %s", structs.HealthPassing, alert.Status)
}
case <-time.After(5 * time.Second):
t.Fatal("didn't get alert within the timeout")
}
}
// Test that we don't alert if the status isn't stable throughout the changeThreshold
func TestWatch_changeThreshold(t *testing.T) {
client, server := testConsul(t)
defer server.Stop()
// Add a service with passing health
server.AddService(testServiceName, structs.HealthPassing, nil)
alertCh := make(chan *AlertState)
config, alertCh := testAlertConfig()
config.ChangeThreshold = 5
go watch(&WatchOptions{
service: testServiceName,
client: client,
config: config,
})
<-time.After(1 * time.Second)
// Change service health to critical
server.AddService(testServiceName, structs.HealthCritical, nil)
<-time.After(1 * time.Second)
// Change service health back to passing so we never get an alert
server.AddService(testServiceName, structs.HealthPassing, nil)
<-time.After(1 * time.Second)
select {
case alert := <-alertCh:
t.Fatalf("received an alert when we should have received nothing: %v", alert)
// If we got nothing after changeThreshold seconds, success
case <-time.After(time.Duration(config.ChangeThreshold) * time.Second):
}
}
// Test that we only get one alert even with multiple watches going
func TestWatch_multipleWatch(t *testing.T) {
client, server := testConsul(t)
defer server.Stop()
// Add a service with passing health
server.AddService(testServiceName, structs.HealthPassing, nil)
config, alertCh := testAlertConfig()
opts := &WatchOptions{
service: testServiceName,
client: client,
config: config,
}
go watch(opts)
go watch(opts)
<-time.After(1 * time.Second)
// Change service health to critical
server.AddService(testServiceName, structs.HealthCritical, nil)
select {
case alert := <-alertCh:
if alert.Status != structs.HealthCritical {
t.Fatalf("expected alert on status %s, got %s", structs.HealthCritical, alert.Status)
}
case <-time.After(5 * time.Second):
t.Fatal("didn't get alert within the timeout")
}
// Set service back to passing health
server.AddService(testServiceName, structs.HealthPassing, nil)
// Make sure the next alert we get is for passing health on the service
select {
case alert := <-alertCh:
if alert.Status != structs.HealthPassing {
t.Fatalf("expected alert on status %s, got %s", structs.HealthPassing, alert.Status)
}
case <-time.After(5 * time.Second):
t.Fatal("didn't get alert within the timeout")
}
// Make sure we don't have any more alerts
select {
case alert := <-alertCh:
t.Fatalf("got unexpected extra alert: %v", alert)
case <-time.After(1 * time.Second):
}
}