383 lines
12 KiB
Go
383 lines
12 KiB
Go
package testutil
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// TestServer is a test helper. It uses a fork/exec model to create
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// a test Consul server instance in the background and initialize it
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// with some data and/or services. The test server can then be used
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// to run a unit test, and offers an easy API to tear itself down
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// when the test has completed. The only prerequisite is to have a consul
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// binary available on the $PATH.
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//
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// This package does not use Consul's official API client. This is
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// because we use TestServer to test the API client, which would
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// otherwise cause an import cycle.
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import (
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"context"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"net"
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"net/http"
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"os"
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"os/exec"
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"path/filepath"
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"strconv"
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"strings"
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"testing"
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"time"
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"github.com/hashicorp/consul/lib/freeport"
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"github.com/hashicorp/consul/testutil/retry"
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"github.com/hashicorp/go-cleanhttp"
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"github.com/hashicorp/go-uuid"
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"github.com/pkg/errors"
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)
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// TestPerformanceConfig configures the performance parameters.
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type TestPerformanceConfig struct {
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RaftMultiplier uint `json:"raft_multiplier,omitempty"`
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}
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// TestPortConfig configures the various ports used for services
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// provided by the Consul server.
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type TestPortConfig struct {
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DNS int `json:"dns,omitempty"`
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HTTP int `json:"http,omitempty"`
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HTTPS int `json:"https,omitempty"`
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SerfLan int `json:"serf_lan,omitempty"`
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SerfWan int `json:"serf_wan,omitempty"`
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Server int `json:"server,omitempty"`
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}
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// TestAddressConfig contains the bind addresses for various
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// components of the Consul server.
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type TestAddressConfig struct {
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HTTP string `json:"http,omitempty"`
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}
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// TestNetworkSegment contains the configuration for a network segment.
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type TestNetworkSegment struct {
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Name string `json:"name"`
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Bind string `json:"bind"`
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Port int `json:"port"`
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Advertise string `json:"advertise"`
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}
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// TestServerConfig is the main server configuration struct.
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type TestServerConfig struct {
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NodeName string `json:"node_name"`
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NodeID string `json:"node_id"`
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NodeMeta map[string]string `json:"node_meta,omitempty"`
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Performance *TestPerformanceConfig `json:"performance,omitempty"`
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Bootstrap bool `json:"bootstrap,omitempty"`
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Server bool `json:"server,omitempty"`
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DataDir string `json:"data_dir,omitempty"`
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Datacenter string `json:"datacenter,omitempty"`
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Segments []TestNetworkSegment `json:"segments"`
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DisableCheckpoint bool `json:"disable_update_check"`
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LogLevel string `json:"log_level,omitempty"`
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Bind string `json:"bind_addr,omitempty"`
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Addresses *TestAddressConfig `json:"addresses,omitempty"`
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Ports *TestPortConfig `json:"ports,omitempty"`
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RaftProtocol int `json:"raft_protocol,omitempty"`
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ACLMasterToken string `json:"acl_master_token,omitempty"`
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ACLDatacenter string `json:"acl_datacenter,omitempty"`
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ACLDefaultPolicy string `json:"acl_default_policy,omitempty"`
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ACLEnforceVersion8 bool `json:"acl_enforce_version_8"`
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Encrypt string `json:"encrypt,omitempty"`
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CAFile string `json:"ca_file,omitempty"`
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CertFile string `json:"cert_file,omitempty"`
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KeyFile string `json:"key_file,omitempty"`
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VerifyIncoming bool `json:"verify_incoming,omitempty"`
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VerifyIncomingRPC bool `json:"verify_incoming_rpc,omitempty"`
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VerifyIncomingHTTPS bool `json:"verify_incoming_https,omitempty"`
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VerifyOutgoing bool `json:"verify_outgoing,omitempty"`
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EnableScriptChecks bool `json:"enable_script_checks,omitempty"`
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ReadyTimeout time.Duration `json:"-"`
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Stdout, Stderr io.Writer `json:"-"`
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Args []string `json:"-"`
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}
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// ServerConfigCallback is a function interface which can be
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// passed to NewTestServerConfig to modify the server config.
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type ServerConfigCallback func(c *TestServerConfig)
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// defaultServerConfig returns a new TestServerConfig struct
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// with all of the listen ports incremented by one.
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func defaultServerConfig() *TestServerConfig {
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nodeID, err := uuid.GenerateUUID()
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if err != nil {
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panic(err)
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}
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ports := freeport.Get(6)
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return &TestServerConfig{
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NodeName: "node-" + nodeID,
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NodeID: nodeID,
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DisableCheckpoint: true,
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Performance: &TestPerformanceConfig{
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RaftMultiplier: 1,
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},
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Bootstrap: true,
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Server: true,
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LogLevel: "debug",
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Bind: "127.0.0.1",
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Addresses: &TestAddressConfig{},
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Ports: &TestPortConfig{
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DNS: ports[0],
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HTTP: ports[1],
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HTTPS: ports[2],
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SerfLan: ports[3],
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SerfWan: ports[4],
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Server: ports[5],
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},
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ReadyTimeout: 10 * time.Second,
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}
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}
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// TestService is used to serialize a service definition.
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type TestService struct {
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ID string `json:",omitempty"`
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Name string `json:",omitempty"`
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Tags []string `json:",omitempty"`
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Address string `json:",omitempty"`
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Port int `json:",omitempty"`
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}
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// TestCheck is used to serialize a check definition.
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type TestCheck struct {
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ID string `json:",omitempty"`
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Name string `json:",omitempty"`
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ServiceID string `json:",omitempty"`
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TTL string `json:",omitempty"`
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}
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// TestKVResponse is what we use to decode KV data.
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type TestKVResponse struct {
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Value string
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}
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// TestServer is the main server wrapper struct.
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type TestServer struct {
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cmd *exec.Cmd
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Config *TestServerConfig
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HTTPAddr string
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HTTPSAddr string
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LANAddr string
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WANAddr string
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HTTPClient *http.Client
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tmpdir string
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}
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// NewTestServer is an easy helper method to create a new Consul
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// test server with the most basic configuration.
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func NewTestServer() (*TestServer, error) {
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return NewTestServerConfigT(nil, nil)
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}
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func NewTestServerConfig(cb ServerConfigCallback) (*TestServer, error) {
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return NewTestServerConfigT(nil, cb)
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}
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// NewTestServerConfig creates a new TestServer, and makes a call to an optional
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// callback function to modify the configuration. If there is an error
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// configuring or starting the server, the server will NOT be running when the
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// function returns (thus you do not need to stop it).
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func NewTestServerConfigT(t *testing.T, cb ServerConfigCallback) (*TestServer, error) {
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return newTestServerConfigT(t, cb)
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}
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// newTestServerConfigT is the internal helper for NewTestServerConfigT.
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func newTestServerConfigT(t *testing.T, cb ServerConfigCallback) (*TestServer, error) {
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path, err := exec.LookPath("consul")
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if err != nil || path == "" {
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return nil, fmt.Errorf("consul not found on $PATH - download and install " +
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"consul or skip this test")
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}
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tmpdir := TempDir(t, "consul")
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cfg := defaultServerConfig()
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cfg.DataDir = filepath.Join(tmpdir, "data")
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if cb != nil {
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cb(cfg)
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}
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b, err := json.Marshal(cfg)
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if err != nil {
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return nil, errors.Wrap(err, "failed marshaling json")
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}
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configFile := filepath.Join(tmpdir, "config.json")
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if err := ioutil.WriteFile(configFile, b, 0644); err != nil {
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defer os.RemoveAll(tmpdir)
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return nil, errors.Wrap(err, "failed writing config content")
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}
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stdout := io.Writer(os.Stdout)
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if cfg.Stdout != nil {
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stdout = cfg.Stdout
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}
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stderr := io.Writer(os.Stderr)
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if cfg.Stderr != nil {
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stderr = cfg.Stderr
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}
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// Start the server
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args := []string{"agent", "-config-file", configFile}
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args = append(args, cfg.Args...)
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cmd := exec.Command("consul", args...)
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cmd.Stdout = stdout
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cmd.Stderr = stderr
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if err := cmd.Start(); err != nil {
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return nil, errors.Wrap(err, "failed starting command")
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}
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httpAddr := fmt.Sprintf("127.0.0.1:%d", cfg.Ports.HTTP)
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client := cleanhttp.DefaultClient()
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if strings.HasPrefix(cfg.Addresses.HTTP, "unix://") {
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httpAddr = cfg.Addresses.HTTP
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tr := cleanhttp.DefaultTransport()
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tr.DialContext = func(_ context.Context, _, _ string) (net.Conn, error) {
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return net.Dial("unix", httpAddr[len("unix://"):])
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}
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client = &http.Client{Transport: tr}
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}
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server := &TestServer{
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Config: cfg,
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cmd: cmd,
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HTTPAddr: httpAddr,
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HTTPSAddr: fmt.Sprintf("127.0.0.1:%d", cfg.Ports.HTTPS),
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LANAddr: fmt.Sprintf("127.0.0.1:%d", cfg.Ports.SerfLan),
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WANAddr: fmt.Sprintf("127.0.0.1:%d", cfg.Ports.SerfWan),
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HTTPClient: client,
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tmpdir: tmpdir,
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}
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// Wait for the server to be ready
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if cfg.Bootstrap {
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err = server.waitForLeader()
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} else {
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err = server.waitForAPI()
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}
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if err != nil {
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defer server.Stop()
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return nil, errors.Wrap(err, "failed waiting for server to start")
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}
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return server, nil
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}
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// Stop stops the test Consul server, and removes the Consul data
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// directory once we are done.
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func (s *TestServer) Stop() error {
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defer os.RemoveAll(s.tmpdir)
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// There was no process
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if s.cmd == nil {
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return nil
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}
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if s.cmd.Process != nil {
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if err := s.cmd.Process.Signal(os.Interrupt); err != nil {
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return errors.Wrap(err, "failed to kill consul server")
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}
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}
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// wait for the process to exit to be sure that the data dir can be
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// deleted on all platforms.
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return s.cmd.Wait()
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}
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type failer struct {
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failed bool
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}
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func (f *failer) Log(args ...interface{}) { fmt.Println(args) }
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func (f *failer) FailNow() { f.failed = true }
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// waitForAPI waits for only the agent HTTP endpoint to start
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// responding. This is an indication that the agent has started,
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// but will likely return before a leader is elected.
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func (s *TestServer) waitForAPI() error {
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f := &failer{}
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retry.Run(f, func(r *retry.R) {
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resp, err := s.HTTPClient.Get(s.url("/v1/agent/self"))
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if err != nil {
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r.Fatal(err)
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}
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defer resp.Body.Close()
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if err := s.requireOK(resp); err != nil {
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r.Fatal("failed OK respose", err)
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}
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})
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if f.failed {
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return errors.New("failed waiting for API")
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}
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return nil
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}
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// waitForLeader waits for the Consul server's HTTP API to become
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// available, and then waits for a known leader and an index of
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// 1 or more to be observed to confirm leader election is done.
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// It then waits to ensure the anti-entropy sync has completed.
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func (s *TestServer) waitForLeader() error {
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f := &failer{}
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timer := &retry.Timer{
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Timeout: s.Config.ReadyTimeout,
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Wait: 250 * time.Millisecond,
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}
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var index int64
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retry.RunWith(timer, f, func(r *retry.R) {
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// Query the API and check the status code.
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url := s.url(fmt.Sprintf("/v1/catalog/nodes?index=%d", index))
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resp, err := s.HTTPClient.Get(url)
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if err != nil {
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r.Fatal("failed http get", err)
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}
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defer resp.Body.Close()
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if err := s.requireOK(resp); err != nil {
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r.Fatal("failed OK response", err)
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}
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// Ensure we have a leader and a node registration.
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if leader := resp.Header.Get("X-Consul-KnownLeader"); leader != "true" {
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r.Fatalf("Consul leader status: %#v", leader)
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}
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index, err = strconv.ParseInt(resp.Header.Get("X-Consul-Index"), 10, 64)
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if err != nil {
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r.Fatal("bad consul index", err)
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}
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if index == 0 {
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r.Fatal("consul index is 0")
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}
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// Watch for the anti-entropy sync to finish.
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var v []map[string]interface{}
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dec := json.NewDecoder(resp.Body)
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if err := dec.Decode(&v); err != nil {
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r.Fatal(err)
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}
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if len(v) < 1 {
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r.Fatal("No nodes")
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}
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taggedAddresses, ok := v[0]["TaggedAddresses"].(map[string]interface{})
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if !ok {
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r.Fatal("Missing tagged addresses")
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}
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if _, ok := taggedAddresses["lan"]; !ok {
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r.Fatal("No lan tagged addresses")
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}
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})
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if f.failed {
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return errors.New("failed waiting for leader")
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}
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return nil
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}
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