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testagent.go
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testagent.go
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package agent
import (
"fmt"
"io"
"io/ioutil"
"log"
"math/rand"
"net/http"
"net/http/httptest"
"os"
"path/filepath"
"runtime"
"strconv"
"strings"
"time"
metrics "github.com/armon/go-metrics"
"github.com/hashicorp/consul/agent/config"
"github.com/hashicorp/consul/agent/consul"
"github.com/hashicorp/consul/agent/structs"
"github.com/hashicorp/consul/api"
"github.com/hashicorp/consul/lib/freeport"
"github.com/hashicorp/consul/logger"
"github.com/hashicorp/consul/testutil/retry"
uuid "github.com/hashicorp/go-uuid"
)
func init() {
rand.Seed(time.Now().UnixNano()) // seed random number generator
}
// TempDir defines the base dir for temporary directories.
var TempDir = os.TempDir()
// TestAgent encapsulates an Agent with a default configuration and
// startup procedure suitable for testing. It panics if there are errors
// during creation or startup instead of returning errors. It manages a
// temporary data directory which is removed after shutdown.
type TestAgent struct {
// Name is an optional name of the agent.
Name string
HCL string
// Config is the agent configuration. If Config is nil then
// TestConfig() is used. If Config.DataDir is set then it is
// the callers responsibility to clean up the data directory.
// Otherwise, a temporary data directory is created and removed
// when Shutdown() is called.
Config *config.RuntimeConfig
// LogOutput is the sink for the logs. If nil, logs are written
// to os.Stderr.
LogOutput io.Writer
// LogWriter is used for streaming logs.
LogWriter *logger.LogWriter
// DataDir is the data directory which is used when Config.DataDir
// is not set. It is created automatically and removed when
// Shutdown() is called.
DataDir string
// Key is the optional encryption key for the LAN and WAN keyring.
Key string
// UseTLS, if true, will disable the HTTP port and enable the HTTPS
// one.
UseTLS bool
// dns is a reference to the first started DNS endpoint.
// It is valid after Start().
dns *DNSServer
// srv is a reference to the first started HTTP endpoint.
// It is valid after Start().
srv *HTTPServer
// Agent is the embedded consul agent.
// It is valid after Start().
*Agent
}
// NewTestAgent returns a started agent with the given name and
// configuration. It panics if the agent could not be started. The
// caller should call Shutdown() to stop the agent and remove temporary
// directories.
func NewTestAgent(name string, hcl string) *TestAgent {
a := &TestAgent{Name: name, HCL: hcl}
a.Start()
return a
}
type panicFailer struct{}
func (f *panicFailer) Log(args ...interface{}) { fmt.Println(args...) }
func (f *panicFailer) FailNow() { panic("failed") }
// Start starts a test agent. It panics if the agent could not be started.
func (a *TestAgent) Start() *TestAgent {
if a.Agent != nil {
panic("TestAgent already started")
}
var hclDataDir string
if a.DataDir == "" {
name := "agent"
if a.Name != "" {
name = a.Name + "-agent"
}
name = strings.Replace(name, "/", "_", -1)
d, err := ioutil.TempDir(TempDir, name)
if err != nil {
panic(fmt.Sprintf("Error creating data dir %s: %s", filepath.Join(TempDir, name), err))
}
hclDataDir = `data_dir = "` + d + `"`
}
id := NodeID()
for i := 10; i >= 0; i-- {
a.Config = TestConfig(
config.Source{Name: a.Name, Format: "hcl", Data: a.HCL},
config.Source{Name: a.Name + ".data_dir", Format: "hcl", Data: hclDataDir},
randomPortsSource(a.UseTLS),
)
// write the keyring
if a.Key != "" {
writeKey := func(key, filename string) {
path := filepath.Join(a.Config.DataDir, filename)
if err := initKeyring(path, key); err != nil {
panic(fmt.Sprintf("Error creating keyring %s: %s", path, err))
}
}
writeKey(a.Key, SerfLANKeyring)
writeKey(a.Key, SerfWANKeyring)
}
agent, err := New(a.Config)
if err != nil {
panic(fmt.Sprintf("Error creating agent: %s", err))
}
logOutput := a.LogOutput
if logOutput == nil {
logOutput = os.Stderr
}
agent.LogOutput = logOutput
agent.LogWriter = a.LogWriter
agent.logger = log.New(logOutput, a.Name+" - ", log.LstdFlags|log.Lmicroseconds)
agent.MemSink = metrics.NewInmemSink(1*time.Second, time.Minute)
// we need the err var in the next exit condition
if err := agent.Start(); err == nil {
a.Agent = agent
break
} else if i == 0 {
fmt.Println(id, a.Name, "Error starting agent:", err)
runtime.Goexit()
} else {
agent.ShutdownAgent()
agent.ShutdownEndpoints()
wait := time.Duration(rand.Int31n(2000)) * time.Millisecond
fmt.Println(id, a.Name, "retrying in", wait)
time.Sleep(wait)
}
// Clean out the data dir if we are responsible for it before we
// try again, since the old ports may have gotten written to
// the data dir, such as in the Raft configuration.
if a.DataDir != "" {
if err := os.RemoveAll(a.DataDir); err != nil {
fmt.Println(id, a.Name, "Error resetting data dir:", err)
runtime.Goexit()
}
}
}
// Start the anti-entropy syncer
a.Agent.StartSync()
var out structs.IndexedNodes
retry.Run(&panicFailer{}, func(r *retry.R) {
if len(a.httpServers) == 0 {
r.Fatal(a.Name, "waiting for server")
}
if a.Config.Bootstrap && a.Config.ServerMode {
// Ensure we have a leader and a node registration.
args := &structs.DCSpecificRequest{
Datacenter: a.Config.Datacenter,
QueryOptions: structs.QueryOptions{
MinQueryIndex: out.Index,
MaxQueryTime: 25 * time.Millisecond,
},
}
if err := a.RPC("Catalog.ListNodes", args, &out); err != nil {
r.Fatal(a.Name, "Catalog.ListNodes failed:", err)
}
if !out.QueryMeta.KnownLeader {
r.Fatal(a.Name, "No leader")
}
if out.Index == 0 {
r.Fatal(a.Name, ": Consul index is 0")
}
} else {
req, _ := http.NewRequest("GET", "/v1/agent/self", nil)
resp := httptest.NewRecorder()
_, err := a.httpServers[0].AgentSelf(resp, req)
if err != nil || resp.Code != 200 {
r.Fatal(a.Name, "failed OK response", err)
}
}
})
a.dns = a.dnsServers[0]
a.srv = a.httpServers[0]
return a
}
// Shutdown stops the agent and removes the data directory if it is
// managed by the test agent.
func (a *TestAgent) Shutdown() error {
/* Removed this because it was breaking persistence tests where we would
persist a service and load it through a new agent with the same data-dir.
Not sure if we still need this for other things, everywhere we manually make
a data dir we already do 'defer os.RemoveAll()'
defer func() {
if a.DataDir != "" {
os.RemoveAll(a.DataDir)
}
}()*/
// shutdown agent before endpoints
defer a.Agent.ShutdownEndpoints()
return a.Agent.ShutdownAgent()
}
func (a *TestAgent) DNSAddr() string {
if a.dns == nil {
return ""
}
return a.dns.Addr
}
func (a *TestAgent) HTTPAddr() string {
if a.srv == nil {
return ""
}
return a.srv.Addr
}
func (a *TestAgent) SegmentAddr(name string) string {
if server, ok := a.Agent.delegate.(*consul.Server); ok {
return server.LANSegmentAddr(name)
}
return ""
}
func (a *TestAgent) Client() *api.Client {
conf := api.DefaultConfig()
conf.Address = a.HTTPAddr()
c, err := api.NewClient(conf)
if err != nil {
panic(fmt.Sprintf("Error creating consul API client: %s", err))
}
return c
}
// DNSDisableCompression disables compression for all started DNS servers.
func (a *TestAgent) DNSDisableCompression(b bool) {
for _, srv := range a.dnsServers {
srv.disableCompression.Store(b)
}
}
func (a *TestAgent) consulConfig() *consul.Config {
c, err := a.Agent.consulConfig()
if err != nil {
panic(err)
}
return c
}
// pickRandomPorts selects random ports from fixed size random blocks of
// ports. This does not eliminate the chance for port conflict but
// reduces it significantly with little overhead. Furthermore, asking
// the kernel for a random port by binding to port 0 prolongs the test
// execution (in our case +20sec) while also not fully eliminating the
// chance of port conflicts for concurrently executed test binaries.
// Instead of relying on one set of ports to be sufficient we retry
// starting the agent with different ports on port conflict.
func randomPortsSource(tls bool) config.Source {
ports := freeport.Get(6)
if tls {
ports[1] = -1
} else {
ports[2] = -1
}
return config.Source{
Name: "ports",
Format: "hcl",
Data: `
ports = {
dns = ` + strconv.Itoa(ports[0]) + `
http = ` + strconv.Itoa(ports[1]) + `
https = ` + strconv.Itoa(ports[2]) + `
serf_lan = ` + strconv.Itoa(ports[3]) + `
serf_wan = ` + strconv.Itoa(ports[4]) + `
server = ` + strconv.Itoa(ports[5]) + `
}
`,
}
}
func NodeID() string {
id, err := uuid.GenerateUUID()
if err != nil {
panic(err)
}
return id
}
// TestConfig returns a unique default configuration for testing an
// agent.
func TestConfig(sources ...config.Source) *config.RuntimeConfig {
nodeID := NodeID()
testsrc := config.Source{
Name: "test",
Format: "hcl",
Data: `
bind_addr = "127.0.0.1"
advertise_addr = "127.0.0.1"
datacenter = "dc1"
bootstrap = true
server = true
node_id = "` + nodeID + `"
node_name = "Node ` + nodeID + `"
performance {
raft_multiplier = 1
}
`,
}
b, err := config.NewBuilder(config.Flags{})
if err != nil {
panic("NewBuilder failed: " + err.Error())
}
b.Head = append(b.Head, testsrc)
b.Tail = append(b.Tail, config.DefaultConsulSource(), config.DevConsulSource())
b.Tail = append(b.Tail, sources...)
cfg, err := b.BuildAndValidate()
if err != nil {
panic("Error building config: " + err.Error())
}
for _, w := range b.Warnings {
fmt.Println("WARNING:", w)
}
return &cfg
}
// TestACLConfig returns a default configuration for testing an agent
// with ACLs.
func TestACLConfig() string {
return `
acl_datacenter = "dc1"
acl_default_policy = "deny"
acl_master_token = "root"
acl_agent_token = "root"
acl_agent_master_token = "towel"
acl_enforce_version_8 = true
`
}