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cluster.go
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cluster.go
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// Copyright 2016 The Cockroach Authors.
//
// Use of this software is governed by the Business Source License
// included in the file licenses/BSL.txt.
//
// As of the Change Date specified in that file, in accordance with
// the Business Source License, use of this software will be governed
// by the Apache License, Version 2.0, included in the file
// licenses/APL.txt.
package localcluster
import (
"bytes"
"context"
gosql "database/sql"
"fmt"
"go/build"
"io"
"io/ioutil"
"math/rand"
"net"
"net/url"
"os"
"os/exec"
"path/filepath"
"sort"
"strings"
"sync/atomic"
"text/tabwriter"
"time"
"github.com/cockroachdb/cockroach/pkg/base"
"github.com/cockroachdb/cockroach/pkg/config/zonepb"
"github.com/cockroachdb/cockroach/pkg/roachpb"
"github.com/cockroachdb/cockroach/pkg/rpc"
"github.com/cockroachdb/cockroach/pkg/security"
"github.com/cockroachdb/cockroach/pkg/server/serverpb"
"github.com/cockroachdb/cockroach/pkg/settings/cluster"
"github.com/cockroachdb/cockroach/pkg/testutils"
"github.com/cockroachdb/cockroach/pkg/util/hlc"
"github.com/cockroachdb/cockroach/pkg/util/log"
"github.com/cockroachdb/cockroach/pkg/util/protoutil"
"github.com/cockroachdb/cockroach/pkg/util/retry"
"github.com/cockroachdb/cockroach/pkg/util/stop"
"github.com/cockroachdb/cockroach/pkg/util/syncutil"
"github.com/cockroachdb/cockroach/pkg/util/timeutil"
"github.com/cockroachdb/cockroach/pkg/util/tracing"
"github.com/gogo/protobuf/proto"
// Import postgres driver.
_ "github.com/lib/pq"
"github.com/pkg/errors"
)
func repoRoot() string {
root, err := build.Import("github.com/cockroachdb/cockroach", "", build.FindOnly)
if err != nil {
panic(fmt.Sprintf("must run from within the cockroach repository: %s", err))
}
return root.Dir
}
// SourceBinary returns the path of the cockroach binary that was built with the
// local source.
func SourceBinary() string {
return filepath.Join(repoRoot(), "cockroach")
}
const listeningURLFile = "cockroachdb-url"
// IsUnavailableError returns true iff the error corresponds to a GRPC
// connection unavailable error.
func IsUnavailableError(err error) bool {
return strings.Contains(err.Error(), "grpc: the connection is unavailable")
}
// A ClusterConfig holds the configuration for a Cluster.
type ClusterConfig struct {
Ephemeral bool // when true, wipe DataDir on Close()
Binary string // path to cockroach, defaults go <cockroach_repo>/cockroach
AllNodeArgs []string // args to pass to ./cockroach on all nodes
NumNodes int // number of nodes in the cluster
DataDir string // node i will use storage DataDir/<i>
LogDir string // when empty, node i defaults to DataDir/<i>/logs
PerNodeCfg map[int]NodeConfig // optional map of nodeIndex -> configuration
DB string // database to configure DB connection for
NumWorkers int // SetMaxOpenConns to use for DB connection
NoWait bool // if set, return from Start before cluster ready
}
// NodeConfig is a configuration for a node in a Cluster. Options with the zero
// value are typically populated from the corresponding Cluster's ClusterConfig.
type NodeConfig struct {
Binary string // when specified, overrides the node's binary
DataDir string // when specified, overrides the node's data dir
LogDir string // when specified, overrides the node's log dir
Addr string // listening host, defaults to 127.0.0.1
ExtraArgs []string // extra arguments for ./cockroach start
ExtraEnv []string // environment variables in format key=value
RPCPort, HTTPPort int // zero for auto-assign
DB string // see ClusterConfig
NumWorkers int // see ClusterConfig
}
// MakePerNodeFixedPortsCfg makes a PerNodeCfg map of the given number of nodes
// with odd ports starting at 26257 for the RPC endpoint, and even points for
// the ui.
func MakePerNodeFixedPortsCfg(numNodes int) map[int]NodeConfig {
perNodeCfg := make(map[int]NodeConfig)
for i := 0; i < numNodes; i++ {
perNodeCfg[i] = NodeConfig{
RPCPort: 26257 + 2*i,
HTTPPort: 26258 + 2*i,
}
}
return perNodeCfg
}
// Cluster holds the state for a local cluster, providing methods for common
// operations, access to the underlying nodes and per-node KV and SQL clients.
type Cluster struct {
Cfg ClusterConfig
seq *seqGen
Nodes []*Node
stopper *stop.Stopper
started time.Time
}
type seqGen int32
func (s *seqGen) Next() int32 {
return atomic.AddInt32((*int32)(s), 1)
}
// New creates a Cluster with the given configuration.
func New(cfg ClusterConfig) *Cluster {
if cfg.Binary == "" {
cfg.Binary = SourceBinary()
}
return &Cluster{
Cfg: cfg,
seq: new(seqGen),
stopper: stop.NewStopper(),
}
}
// Start starts a cluster. The numWorkers parameter controls the SQL connection
// settings to avoid unnecessary connection creation. The allNodeArgs parameter
// can be used to pass extra arguments to every node. The perNodeArgs parameter
// can be used to pass extra arguments to an individual node. If not nil, its
// size must equal the number of nodes.
func (c *Cluster) Start(ctx context.Context) {
c.started = timeutil.Now()
chs := make([]<-chan error, c.Cfg.NumNodes)
for i := 0; i < c.Cfg.NumNodes; i++ {
cfg := c.Cfg.PerNodeCfg[i] // zero value is ok
if cfg.Binary == "" {
cfg.Binary = c.Cfg.Binary
}
if cfg.DataDir == "" {
cfg.DataDir = filepath.Join(c.Cfg.DataDir, fmt.Sprintf("%d", i+1))
}
if cfg.LogDir == "" && c.Cfg.LogDir != "" {
cfg.LogDir = filepath.Join(c.Cfg.LogDir, fmt.Sprintf("%d", i+1))
}
if cfg.Addr == "" {
cfg.Addr = "127.0.0.1"
}
if cfg.DB == "" {
cfg.DB = c.Cfg.DB
}
if cfg.NumWorkers == 0 {
cfg.NumWorkers = c.Cfg.NumWorkers
}
cfg.ExtraArgs = append(append([]string(nil), c.Cfg.AllNodeArgs...), cfg.ExtraArgs...)
var node *Node
node, chs[i] = c.makeNode(ctx, i, cfg)
c.Nodes = append(c.Nodes, node)
if i == 0 && cfg.RPCPort == 0 && c.Cfg.NumNodes > 1 {
// The first node must know its RPCPort or we can't possibly tell
// the other nodes the correct one to go to.
//
// Note: we can't set up a cluster first and clone it for each test,
// because all ports change so the cluster won't come together.
// Luckily, it takes only ~2 seconds from zero to a replicated 4
// node cluster.
if err := <-chs[0]; err != nil {
log.Fatalf(ctx, "while starting first node: %s", err)
}
ch := make(chan error)
close(ch)
chs[0] = ch
}
}
if !c.Cfg.NoWait {
for i := range chs {
if err := <-chs[i]; err != nil {
log.Fatalf(ctx, "node %d: %s", i+1, err)
}
}
}
log.Infof(context.Background(), "started %.3fs", timeutil.Since(c.started).Seconds())
if c.Cfg.NumNodes > 1 || !c.Cfg.NoWait {
c.waitForFullReplication()
} else {
// NB: This is useful for TestRapidRestarts.
log.Infof(ctx, "not waiting for initial replication")
}
}
// Close stops the cluster, killing all of the nodes.
func (c *Cluster) Close() {
for _, n := range c.Nodes {
n.Kill()
}
c.stopper.Stop(context.Background())
if c.Cfg.Ephemeral {
_ = os.RemoveAll(c.Cfg.DataDir)
}
}
func (c *Cluster) joins() []string {
type addrAndSeq struct {
addr string
seq int32
}
var joins []addrAndSeq
for _, node := range c.Nodes {
advertAddr := node.AdvertiseAddr()
if advertAddr != "" {
joins = append(joins, addrAndSeq{
addr: advertAddr,
seq: atomic.LoadInt32(&node.startSeq),
})
}
}
sort.Slice(joins, func(i, j int) bool {
return joins[i].seq < joins[j].seq
})
if len(joins) == 0 {
return nil
}
// Return the node with the smallest startSeq, i.e. the node that was
// started first. This is the node that might have no --join flag set, and
// we must point the other nodes at it, and *only* at it (or the other nodes
// may connect sufficiently and never bother to talk to this node).
return []string{joins[0].addr}
}
// IPAddr returns the IP address of the specified node.
func (c *Cluster) IPAddr(nodeIdx int) string {
return c.Nodes[nodeIdx].IPAddr()
}
// RPCPort returns the RPC port of the specified node. Returns zero if unknown.
func (c *Cluster) RPCPort(nodeIdx int) string {
return c.Nodes[nodeIdx].RPCPort()
}
func (c *Cluster) makeNode(ctx context.Context, nodeIdx int, cfg NodeConfig) (*Node, <-chan error) {
baseCtx := &base.Config{
User: security.NodeUser,
Insecure: true,
}
rpcCtx := rpc.NewContext(log.AmbientContext{Tracer: tracing.NewTracer()}, baseCtx,
hlc.NewClock(hlc.UnixNano, 0), c.stopper, cluster.MakeTestingClusterSettings())
n := &Node{
Cfg: cfg,
rpcCtx: rpcCtx,
seq: c.seq,
}
args := []string{
cfg.Binary,
"start",
"--insecure",
// Although --host/--port are deprecated, we cannot yet replace
// this here by --listen-addr/--listen-port, because
// TestVersionUpgrade will also try old binaries.
fmt.Sprintf("--host=%s", n.IPAddr()),
fmt.Sprintf("--port=%d", cfg.RPCPort),
fmt.Sprintf("--http-port=%d", cfg.HTTPPort),
fmt.Sprintf("--store=%s", cfg.DataDir),
fmt.Sprintf("--listening-url-file=%s", n.listeningURLFile()),
fmt.Sprintf("--cache=256MiB"),
}
if n.Cfg.LogDir != "" {
args = append(args, fmt.Sprintf("--log-dir=%s", n.Cfg.LogDir))
}
n.Cfg.ExtraArgs = append(args, cfg.ExtraArgs...)
if err := os.MkdirAll(n.logDir(), 0755); err != nil {
log.Fatalf(context.Background(), "%v", err)
}
joins := c.joins()
if nodeIdx > 0 && len(joins) == 0 {
ch := make(chan error, 1)
ch <- errors.Errorf("node %d started without join flags", nodeIdx+1)
return nil, ch
}
ch := n.StartAsync(ctx, joins...)
return n, ch
}
// waitForFullReplication waits for the cluster to be fully replicated.
func (c *Cluster) waitForFullReplication() {
for i := 1; true; i++ {
done, detail := c.isReplicated()
if (done && i >= 50) || (i%50) == 0 {
fmt.Print(detail)
log.Infof(context.Background(), "waiting for replication")
}
if done {
break
}
time.Sleep(100 * time.Millisecond)
}
log.Infof(context.Background(), "replicated %.3fs", timeutil.Since(c.started).Seconds())
}
func (c *Cluster) isReplicated() (bool, string) {
db := c.Nodes[0].DB()
rows, err := db.Query(`SELECT range_id, start_key, end_key, array_length(replicas, 1) FROM crdb_internal.ranges`)
if err != nil {
// Versions <= 1.1 do not contain the crdb_internal table, which is what's used
// to determine whether a cluster has up-replicated. This is relevant for the
// version upgrade acceptance test. Just skip the replication check for this case.
if testutils.IsError(err, "(table|relation) \"crdb_internal.ranges\" does not exist") {
return true, ""
}
log.Fatalf(context.Background(), "%v", err)
}
defer rows.Close()
var buf bytes.Buffer
tw := tabwriter.NewWriter(&buf, 2, 1, 2, ' ', 0)
done := true
for rows.Next() {
var rangeID int64
var startKey, endKey roachpb.Key
var numReplicas int
if err := rows.Scan(&rangeID, &startKey, &endKey, &numReplicas); err != nil {
log.Fatalf(context.Background(), "unable to scan range replicas: %s", err)
}
fmt.Fprintf(tw, "\t%s\t%s\t[%d]\t%d\n", startKey, endKey, rangeID, numReplicas)
// This check is coarse since it doesn't know the real configuration.
// Assume all is well when there are 3+ replicas, or if there are as
// many replicas as there are nodes.
if numReplicas < 3 && numReplicas != len(c.Nodes) {
done = false
}
}
_ = tw.Flush()
return done, buf.String()
}
// UpdateZoneConfig updates the default zone config for the cluster.
func (c *Cluster) UpdateZoneConfig(rangeMinBytes, rangeMaxBytes int64) {
zone := zonepb.DefaultZoneConfig()
zone.RangeMinBytes = proto.Int64(rangeMinBytes)
zone.RangeMaxBytes = proto.Int64(rangeMaxBytes)
buf, err := protoutil.Marshal(&zone)
if err != nil {
log.Fatalf(context.Background(), "%v", err)
}
_, err = c.Nodes[0].DB().Exec(`UPSERT INTO system.zones (id, config) VALUES (0, $1)`, buf)
if err != nil {
log.Fatalf(context.Background(), "%v", err)
}
}
// Split splits the range containing the split key at the specified split key.
func (c *Cluster) Split(nodeIdx int, splitKey roachpb.Key) error {
return errors.Errorf("Split is unimplemented and should be re-implemented using SQL")
}
// TransferLease transfers the lease for the range containing key to a random
// alive node in the range.
func (c *Cluster) TransferLease(nodeIdx int, r *rand.Rand, key roachpb.Key) (bool, error) {
return false, errors.Errorf("TransferLease is unimplemented and should be re-implemented using SQL")
}
// RandNode returns the index of a random alive node.
func (c *Cluster) RandNode(f func(int) int) int {
for {
i := f(len(c.Nodes))
if c.Nodes[i].Alive() {
return i
}
}
}
// Node holds the state for a single node in a local cluster and provides
// methods for starting, pausing, resuming and stopping the node.
type Node struct {
Cfg NodeConfig
rpcCtx *rpc.Context
seq *seqGen
startSeq int32 // updated atomically on start, nonzero while running
waitErr atomic.Value // last `error`` returned from cmd.Wait()
syncutil.Mutex
notRunning chan struct{}
cmd *exec.Cmd
rpcPort, pgURL string // legacy: remove once 1.0.x is no longer tested
db *gosql.DB
statusClient serverpb.StatusClient
}
// RPCPort returns the RPC + Postgres port.
func (n *Node) RPCPort() string {
if s := func() string {
// Legacy case. To be removed.
n.Lock()
defer n.Unlock()
if n.rpcPort != "" && n.rpcPort != "0" {
return n.rpcPort
}
return ""
}(); s != "" {
return s
}
advAddr := readFileOrEmpty(n.advertiseAddrFile())
if advAddr == "" {
return ""
}
_, p, _ := net.SplitHostPort(advAddr)
return p
}
// RPCAddr returns the RPC + Postgres address, or an empty string if it is not known
// (for instance since the node is down).
func (n *Node) RPCAddr() string {
port := n.RPCPort()
if port == "" || port == "0" {
return ""
}
return net.JoinHostPort(n.IPAddr(), port)
}
// HTTPAddr returns the HTTP address (once known).
func (n *Node) HTTPAddr() string {
return readFileOrEmpty(n.httpAddrFile())
}
// PGUrl returns the postgres connection string (may be empty until known).
func (n *Node) PGUrl() string {
n.Lock()
defer n.Unlock()
return n.pgURL
}
// Alive returns true if the node is alive (i.e. not stopped). Note that a
// paused node is considered alive.
func (n *Node) Alive() bool {
n.Lock()
defer n.Unlock()
return n.cmd != nil
}
// StatusClient returns a StatusClient set up to talk to this node.
func (n *Node) StatusClient() serverpb.StatusClient {
n.Lock()
existingClient := n.statusClient
n.Unlock()
if existingClient != nil {
return existingClient
}
conn, _, err := n.rpcCtx.GRPCDialRaw(n.RPCAddr())
if err != nil {
log.Fatalf(context.Background(), "failed to initialize status client: %s", err)
}
return serverpb.NewStatusClient(conn)
}
func (n *Node) logDir() string {
if n.Cfg.LogDir == "" {
return filepath.Join(n.Cfg.DataDir, "logs")
}
return n.Cfg.LogDir
}
func (n *Node) listeningURLFile() string {
return filepath.Join(n.Cfg.DataDir, listeningURLFile)
}
// Start starts a node.
func (n *Node) Start(ctx context.Context, joins ...string) {
if err := <-n.StartAsync(ctx, joins...); err != nil {
log.Fatalf(ctx, "%v", err)
}
}
func (n *Node) setNotRunningLocked(waitErr *exec.ExitError) {
_ = os.Remove(n.listeningURLFile())
_ = os.Remove(n.advertiseAddrFile())
_ = os.Remove(n.httpAddrFile())
if n.notRunning != nil {
close(n.notRunning)
}
n.notRunning = make(chan struct{})
n.db = nil
n.statusClient = nil
n.cmd = nil
n.rpcPort = ""
n.waitErr.Store(waitErr)
atomic.StoreInt32(&n.startSeq, 0)
}
func (n *Node) startAsyncInnerLocked(ctx context.Context, joins ...string) error {
n.setNotRunningLocked(nil)
args := append([]string(nil), n.Cfg.ExtraArgs[1:]...)
for _, join := range joins {
args = append(args, "--join", join)
}
n.cmd = exec.Command(n.Cfg.ExtraArgs[0], args...)
n.cmd.Env = os.Environ()
n.cmd.Env = append(n.cmd.Env, "COCKROACH_SCAN_MAX_IDLE_TIME=5ms") // speed up rebalancing
n.cmd.Env = append(n.cmd.Env, n.Cfg.ExtraEnv...)
atomic.StoreInt32(&n.startSeq, n.seq.Next())
_ = os.MkdirAll(n.logDir(), 0755)
stdoutPath := filepath.Join(n.logDir(), "stdout")
stdout, err := os.OpenFile(stdoutPath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
return errors.Wrapf(err, "unable to open file %s", stdoutPath)
}
// This causes the "node startup header" to be printed to stdout, which is
// helpful and not too noisy.
n.cmd.Stdout = io.MultiWriter(stdout, os.Stdout)
stderrPath := filepath.Join(n.logDir(), "stderr")
stderr, err := os.OpenFile(stderrPath, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
if err != nil {
return errors.Wrapf(err, "unable to open file %s", stderrPath)
}
n.cmd.Stderr = stderr
if n.Cfg.RPCPort > 0 {
n.rpcPort = fmt.Sprintf("%d", n.Cfg.RPCPort)
}
if err := n.cmd.Start(); err != nil {
if err := stdout.Close(); err != nil {
log.Warningf(ctx, "%v", err)
}
if err := stderr.Close(); err != nil {
log.Warningf(ctx, "%v", err)
}
return errors.Wrapf(err, "running %s %v", n.cmd.Path, n.cmd.Args)
}
log.Infof(ctx, "process %d starting: %s", n.cmd.Process.Pid, n.cmd.Args)
go func(cmd *exec.Cmd) {
waitErr := cmd.Wait()
if waitErr != nil {
log.Warningf(ctx, "%v", waitErr)
}
if err := stdout.Close(); err != nil {
log.Warningf(ctx, "%v", err)
}
if err := stderr.Close(); err != nil {
log.Warningf(ctx, "%v", err)
}
log.Infof(ctx, "process %d: %s", cmd.Process.Pid, cmd.ProcessState)
execErr, _ := waitErr.(*exec.ExitError)
n.Lock()
n.setNotRunningLocked(execErr)
n.Unlock()
}(n.cmd)
return nil
}
// StartAsync starts a node asynchronously. It returns a buffered channel that
// receives either an error, or, once the node has started up and is fully
// functional, `nil`.
//
// StartAsync is a no-op if the node is already running.
func (n *Node) StartAsync(ctx context.Context, joins ...string) <-chan error {
ch := make(chan error, 1)
if err := func() error {
n.Lock()
defer n.Unlock()
if n.cmd != nil {
return errors.New("server is already running")
}
return n.startAsyncInnerLocked(ctx, joins...)
}(); err != nil {
ch <- err
return ch
}
go func() {
// If the node does not become live within a minute, something is wrong and
// it's better not to hang indefinitely.
ch <- n.waitUntilLive(time.Minute)
}()
return ch
}
func portFromURL(rawURL string) (string, *url.URL, error) {
u, err := url.Parse(rawURL)
if err != nil {
return "", nil, err
}
_, port, err := net.SplitHostPort(u.Host)
return port, u, err
}
func makeDB(url string, numWorkers int, dbName string) *gosql.DB {
conn, err := gosql.Open("postgres", url)
if err != nil {
log.Fatalf(context.Background(), "%v", err)
}
if numWorkers == 0 {
numWorkers = 1
}
conn.SetMaxOpenConns(numWorkers)
conn.SetMaxIdleConns(numWorkers)
return conn
}
func (n *Node) advertiseAddrFile() string {
return filepath.Join(n.Cfg.DataDir, "cockroach.advertise-addr")
}
func (n *Node) httpAddrFile() string {
return filepath.Join(n.Cfg.DataDir, "cockroach.http-addr")
}
func readFileOrEmpty(f string) string {
c, err := ioutil.ReadFile(f)
if err != nil {
if !os.IsNotExist(err) {
panic(err)
}
return ""
}
return string(c)
}
// AdvertiseAddr returns the Node's AdvertiseAddr or empty if none is available.
func (n *Node) AdvertiseAddr() (s string) {
addr := readFileOrEmpty(n.advertiseAddrFile())
if addr != "" {
return addr
}
// The below is part of the workaround for nodes at v1.0 which don't
// write the file above, explained in more detail in StartAsync().
if port := n.RPCPort(); port != "" {
return net.JoinHostPort(n.IPAddr(), n.RPCPort())
}
return addr
}
func (n *Node) waitUntilLive(dur time.Duration) error {
ctx := context.Background()
closer := make(chan struct{})
defer time.AfterFunc(dur, func() { close(closer) }).Stop()
opts := retry.Options{
InitialBackoff: time.Millisecond,
MaxBackoff: 500 * time.Millisecond,
Multiplier: 2,
Closer: closer,
}
for r := retry.Start(opts); r.Next(); {
var pid int
n.Lock()
if n.cmd != nil {
pid = n.cmd.Process.Pid
}
n.Unlock()
if pid == 0 {
log.Info(ctx, "process already quit")
return nil
}
urlBytes, err := ioutil.ReadFile(n.listeningURLFile())
if err != nil {
log.Infof(ctx, "%v", err)
continue
}
var pgURL *url.URL
_, pgURL, err = portFromURL(string(urlBytes))
if err != nil {
log.Infof(ctx, "%v", err)
continue
}
if n.Cfg.RPCPort == 0 {
n.Lock()
n.rpcPort = pgURL.Port()
n.Unlock()
}
pgURL.Path = n.Cfg.DB
n.Lock()
n.pgURL = pgURL.String()
n.Unlock()
var uiURL *url.URL
defer func() {
log.Infof(ctx, "process %d started (db: %s ui: %s)", pid, pgURL, uiURL)
}()
// We're basically running, but (at least) the decommissioning test sometimes starts
// up servers that can already be draining when they get here. For that reason, leave
// the admin port undefined if we don't manage to get it.
//
// This can be improved by making the below code run opportunistically whenever the
// http port is required but isn't initialized yet.
n.Lock()
n.db = makeDB(n.pgURL, n.Cfg.NumWorkers, n.Cfg.DB)
n.Unlock()
{
var uiStr string
if err := n.db.QueryRow(
`SELECT value FROM crdb_internal.node_runtime_info WHERE component='UI' AND field = 'URL'`,
).Scan(&uiStr); err != nil {
log.Infof(ctx, "%v", err)
return nil
}
_, uiURL, err = portFromURL(uiStr)
if err != nil {
log.Infof(ctx, "%v", err)
// TODO(tschottdorf): see above.
}
}
return nil
}
return errors.Errorf("node %+v was unable to join cluster within %s", n.Cfg, dur)
}
// Kill stops a node abruptly by sending it SIGKILL.
func (n *Node) Kill() {
n.Signal(os.Kill)
// Wait for the process to have been cleaned up (or a call to Start() could
// turn into an unintended no-op).
for ok := false; !ok; {
n.Lock()
ok = n.cmd == nil
n.Unlock()
}
}
// IPAddr returns the node's listening address (for ui, inter-node, cli, and
// Postgres alike).
func (n *Node) IPAddr() string {
return n.Cfg.Addr
}
// DB returns a Postgres connection set up to talk to the node.
func (n *Node) DB() *gosql.DB {
n.Lock()
defer n.Unlock()
return n.db
}
// Signal sends the given signal to the process. It is a no-op if the process is
// not running.
func (n *Node) Signal(s os.Signal) {
n.Lock()
defer n.Unlock()
if n.cmd == nil || n.cmd.Process == nil {
return
}
if err := n.cmd.Process.Signal(s); err != nil {
log.Warningf(context.Background(), "%v", err)
}
}
// Wait waits for the process to terminate and returns its process' Wait(). This
// is nil if the process terminated with a zero exit code.
func (n *Node) Wait() *exec.ExitError {
n.Lock()
ch := n.notRunning
n.Unlock()
if ch == nil {
log.Warning(context.Background(), "(*Node).Wait called when node was not running")
return nil
}
<-ch
ee, _ := n.waitErr.Load().(*exec.ExitError)
return ee
}
// Silence unused warning.
var _ = (*Node)(nil).Wait