package testutil // TestServer is a test helper. It uses a fork/exec model to create // a test Consul server instance in the background and initialize it // with some data and/or services. The test server can then be used // to run a unit test, and offers an easy API to tear itself down // when the test has completed. The only prerequisite is to have a consul // binary available on the $PATH. // // This package does not use Consul's official API client. This is // because we use TestServer to test the API client, which would // otherwise cause an import cycle. import ( "context" "encoding/json" "fmt" "io" "io/ioutil" "net" "net/http" "os" "os/exec" "path/filepath" "strconv" "strings" "testing" "time" "github.com/hashicorp/consul/testutil/retry" "github.com/hashicorp/go-cleanhttp" "github.com/hashicorp/go-uuid" "github.com/pkg/errors" ) // TestPerformanceConfig configures the performance parameters. type TestPerformanceConfig struct { RaftMultiplier uint `json:"raft_multiplier,omitempty"` } // TestPortConfig configures the various ports used for services // provided by the Consul server. type TestPortConfig struct { DNS int `json:"dns,omitempty"` HTTP int `json:"http,omitempty"` HTTPS int `json:"https,omitempty"` SerfLan int `json:"serf_lan,omitempty"` SerfWan int `json:"serf_wan,omitempty"` Server int `json:"server,omitempty"` // Deprecated RPC int `json:"rpc,omitempty"` } // TestAddressConfig contains the bind addresses for various // components of the Consul server. type TestAddressConfig struct { HTTP string `json:"http,omitempty"` } // TestServerConfig is the main server configuration struct. type TestServerConfig struct { NodeName string `json:"node_name"` NodeID string `json:"node_id"` NodeMeta map[string]string `json:"node_meta,omitempty"` Performance *TestPerformanceConfig `json:"performance,omitempty"` Bootstrap bool `json:"bootstrap,omitempty"` Server bool `json:"server,omitempty"` DataDir string `json:"data_dir,omitempty"` Datacenter string `json:"datacenter,omitempty"` DisableCheckpoint bool `json:"disable_update_check"` LogLevel string `json:"log_level,omitempty"` Bind string `json:"bind_addr,omitempty"` Addresses *TestAddressConfig `json:"addresses,omitempty"` Ports *TestPortConfig `json:"ports,omitempty"` RaftProtocol int `json:"raft_protocol,omitempty"` ACLMasterToken string `json:"acl_master_token,omitempty"` ACLDatacenter string `json:"acl_datacenter,omitempty"` ACLDefaultPolicy string `json:"acl_default_policy,omitempty"` ACLEnforceVersion8 bool `json:"acl_enforce_version_8"` Encrypt string `json:"encrypt,omitempty"` CAFile string `json:"ca_file,omitempty"` CertFile string `json:"cert_file,omitempty"` KeyFile string `json:"key_file,omitempty"` VerifyIncoming bool `json:"verify_incoming,omitempty"` VerifyIncomingRPC bool `json:"verify_incoming_rpc,omitempty"` VerifyIncomingHTTPS bool `json:"verify_incoming_https,omitempty"` VerifyOutgoing bool `json:"verify_outgoing,omitempty"` EnableScriptChecks bool `json:"enable_script_checks,omitempty"` ReadyTimeout time.Duration `json:"-"` Stdout, Stderr io.Writer `json:"-"` Args []string `json:"-"` } // ServerConfigCallback is a function interface which can be // passed to NewTestServerConfig to modify the server config. type ServerConfigCallback func(c *TestServerConfig) // defaultServerConfig returns a new TestServerConfig struct // with all of the listen ports incremented by one. func defaultServerConfig() *TestServerConfig { nodeID, err := uuid.GenerateUUID() if err != nil { panic(err) } return &TestServerConfig{ NodeName: fmt.Sprintf("node%d", randomPort()), NodeID: nodeID, DisableCheckpoint: true, Performance: &TestPerformanceConfig{ RaftMultiplier: 1, }, Bootstrap: true, Server: true, LogLevel: "debug", Bind: "127.0.0.1", Addresses: &TestAddressConfig{}, Ports: &TestPortConfig{ DNS: randomPort(), HTTP: randomPort(), HTTPS: randomPort(), SerfLan: randomPort(), SerfWan: randomPort(), Server: randomPort(), RPC: randomPort(), }, ReadyTimeout: 10 * time.Second, } } // randomPort asks the kernel for a random port to use. func randomPort() int { l, err := net.Listen("tcp", "127.0.0.1:0") if err != nil { panic(err) } defer l.Close() return l.Addr().(*net.TCPAddr).Port } // TestService is used to serialize a service definition. type TestService struct { ID string `json:",omitempty"` Name string `json:",omitempty"` Tags []string `json:",omitempty"` Address string `json:",omitempty"` Port int `json:",omitempty"` } // TestCheck is used to serialize a check definition. type TestCheck struct { ID string `json:",omitempty"` Name string `json:",omitempty"` ServiceID string `json:",omitempty"` TTL string `json:",omitempty"` } // TestKVResponse is what we use to decode KV data. type TestKVResponse struct { Value string } // TestServer is the main server wrapper struct. type TestServer struct { cmd *exec.Cmd Config *TestServerConfig HTTPAddr string HTTPSAddr string LANAddr string WANAddr string HTTPClient *http.Client tmpdir string } // NewTestServer is an easy helper method to create a new Consul // test server with the most basic configuration. func NewTestServer() (*TestServer, error) { return NewTestServerConfigT(nil, nil) } func NewTestServerConfig(cb ServerConfigCallback) (*TestServer, error) { return NewTestServerConfigT(nil, cb) } // NewTestServerConfig creates a new TestServer, and makes a call to an optional // callback function to modify the configuration. If there is an error // configuring or starting the server, the server will NOT be running when the // function returns (thus you do not need to stop it). func NewTestServerConfigT(t *testing.T, cb ServerConfigCallback) (*TestServer, error) { var server *TestServer retry.Run(t, func(r *retry.R) { var err error server, err = newTestServerConfigT(t, cb) if err != nil { r.Fatalf("failed starting test server: %v", err) } }) return server, nil } // newTestServerConfigT is the internal helper for NewTestServerConfigT. func newTestServerConfigT(t *testing.T, cb ServerConfigCallback) (*TestServer, error) { path, err := exec.LookPath("consul") if err != nil || path == "" { return nil, fmt.Errorf("consul not found on $PATH - download and install " + "consul or skip this test") } tmpdir := TempDir(t, "consul") cfg := defaultServerConfig() cfg.DataDir = filepath.Join(tmpdir, "data") if cb != nil { cb(cfg) } b, err := json.Marshal(cfg) if err != nil { return nil, errors.Wrap(err, "failed marshaling json") } configFile := filepath.Join(tmpdir, "config.json") if err := ioutil.WriteFile(configFile, b, 0644); err != nil { defer os.RemoveAll(tmpdir) return nil, errors.Wrap(err, "failed writing config content") } stdout := io.Writer(os.Stdout) if cfg.Stdout != nil { stdout = cfg.Stdout } stderr := io.Writer(os.Stderr) if cfg.Stderr != nil { stderr = cfg.Stderr } // Start the server args := []string{"agent", "-config-file", configFile} args = append(args, cfg.Args...) cmd := exec.Command("consul", args...) cmd.Stdout = stdout cmd.Stderr = stderr if err := cmd.Start(); err != nil { return nil, errors.Wrap(err, "failed starting command") } httpAddr := fmt.Sprintf("127.0.0.1:%d", cfg.Ports.HTTP) client := cleanhttp.DefaultClient() if strings.HasPrefix(cfg.Addresses.HTTP, "unix://") { httpAddr = cfg.Addresses.HTTP tr := cleanhttp.DefaultTransport() tr.DialContext = func(_ context.Context, _, _ string) (net.Conn, error) { return net.Dial("unix", httpAddr[len("unix://"):]) } client = &http.Client{Transport: tr} } server := &TestServer{ Config: cfg, cmd: cmd, HTTPAddr: httpAddr, HTTPSAddr: fmt.Sprintf("127.0.0.1:%d", cfg.Ports.HTTPS), LANAddr: fmt.Sprintf("127.0.0.1:%d", cfg.Ports.SerfLan), WANAddr: fmt.Sprintf("127.0.0.1:%d", cfg.Ports.SerfWan), HTTPClient: client, tmpdir: tmpdir, } // Wait for the server to be ready if cfg.Bootstrap { err = server.waitForLeader() } else { err = server.waitForAPI() } if err != nil { defer server.Stop() return nil, errors.Wrap(err, "failed waiting for server to start") } return server, nil } // Stop stops the test Consul server, and removes the Consul data // directory once we are done. func (s *TestServer) Stop() error { defer os.RemoveAll(s.tmpdir) // There was no process if s.cmd == nil { return nil } if s.cmd.Process != nil { if err := s.cmd.Process.Signal(os.Interrupt); err != nil { return errors.Wrap(err, "failed to kill consul server") } } // wait for the process to exit to be sure that the data dir can be // deleted on all platforms. return s.cmd.Wait() } type failer struct { failed bool } func (f *failer) Log(args ...interface{}) { fmt.Println(args) } func (f *failer) FailNow() { f.failed = true } // waitForAPI waits for only the agent HTTP endpoint to start // responding. This is an indication that the agent has started, // but will likely return before a leader is elected. func (s *TestServer) waitForAPI() error { f := &failer{} retry.Run(f, func(r *retry.R) { resp, err := s.HTTPClient.Get(s.url("/v1/agent/self")) if err != nil { r.Fatal(err) } defer resp.Body.Close() if err := s.requireOK(resp); err != nil { r.Fatal("failed OK respose", err) } }) if f.failed { return errors.New("failed waiting for API") } return nil } // waitForLeader waits for the Consul server's HTTP API to become // available, and then waits for a known leader and an index of // 1 or more to be observed to confirm leader election is done. // It then waits to ensure the anti-entropy sync has completed. func (s *TestServer) waitForLeader() error { f := &failer{} timer := &retry.Timer{ Timeout: s.Config.ReadyTimeout, Wait: 250 * time.Millisecond, } var index int64 retry.RunWith(timer, f, func(r *retry.R) { // Query the API and check the status code. url := s.url(fmt.Sprintf("/v1/catalog/nodes?index=%d", index)) resp, err := s.HTTPClient.Get(url) if err != nil { r.Fatal("failed http get", err) } defer resp.Body.Close() if err := s.requireOK(resp); err != nil { r.Fatal("failed OK response", err) } // Ensure we have a leader and a node registration. if leader := resp.Header.Get("X-Consul-KnownLeader"); leader != "true" { r.Fatalf("Consul leader status: %#v", leader) } index, err = strconv.ParseInt(resp.Header.Get("X-Consul-Index"), 10, 64) if err != nil { r.Fatal("bad consul index", err) } if index == 0 { r.Fatal("consul index is 0") } // Watch for the anti-entropy sync to finish. var v []map[string]interface{} dec := json.NewDecoder(resp.Body) if err := dec.Decode(&v); err != nil { r.Fatal(err) } if len(v) < 1 { r.Fatal("No nodes") } taggedAddresses, ok := v[0]["TaggedAddresses"].(map[string]interface{}) if !ok { r.Fatal("Missing tagged addresses") } if _, ok := taggedAddresses["lan"]; !ok { r.Fatal("No lan tagged addresses") } }) if f.failed { return errors.New("failed waiting for leader") } return nil }