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dex/vendor/github.com/cockroachdb/cockroach-go/testserver/testserver.go

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2016-09-19 21:17:53 +05:30
// Copyright 2016 The Cockroach Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied. See the License for the specific language governing
// permissions and limitations under the License.
//
// Author: Marc Berhault (marc@cockroachlabs.com)
// Package testserver provides helpers to run a cockroach binary within tests.
// It automatically downloads the latest cockroach binary for your platform
// (Linux-amd64 and Darwin-amd64 only for now), or attempts to run "cockroach"
// from your PATH.
//
// A normal invocation is (check err every time):
// ts, err := testserver.NewTestServer()
// err = ts.Start()
// defer ts.Stop()
// url := ts.PGURL()
//
// To use, run as follows:
// import "github.com/cockroachdb/cockroach-go/testserver"
// import "testing"
// import "time"
//
// func TestRunServer(t *testing.T) {
// ts, err := testserver.NewTestServer()
// if err != nil {
// t.Fatal(err)
// }
// err := ts.Start()
// if err != nil {
// t.Fatal(err)
// }
// defer ts.Stop()
//
// url := ts.PGURL()
// if url != nil {
// t.FatalF("url not found")
// }
// t.Logf("URL: %s", url.String())
//
// db, err := sql.Open("postgres", url.String())
// if err != nil {
// t.Fatal(err)
// }
// }
package testserver
import (
"database/sql"
"errors"
"fmt"
"io/ioutil"
"log"
"net/url"
"os"
"os/exec"
"os/user"
"path/filepath"
"regexp"
"strings"
"sync"
"syscall"
"testing"
"time"
)
var sqlURLRegexp = regexp.MustCompile("sql:\\s+(postgresql:.+)\n")
const (
stateNew = iota
stateRunning = iota
stateStopped = iota
stateFailed = iota
socketPort = 26257
socketFileBase = ".s.PGSQL"
)
// TestServer is a helper to run a real cockroach node.
type TestServer struct {
mu sync.RWMutex
state int
baseDir string
pgURL *url.URL
cmd *exec.Cmd
args []string
stdout string
stderr string
stdoutBuf logWriter
stderrBuf logWriter
}
// NewDBForTest creates a new CockroachDB TestServer instance and
// opens a SQL database connection to it. Returns a sql *DB instance a
// shutdown function. The caller is responsible for executing the
// returned shutdown function on exit.
func NewDBForTest(t *testing.T) (*sql.DB, func()) {
return NewDBForTestWithDatabase(t, "")
}
// NewDBForTestWithDatabase creates a new CockroachDB TestServer
// instance and opens a SQL database connection to it. If database is
// specified, the returned connection will explicitly connect to
// it. Returns a sql *DB instance a shutdown function. The caller is
// responsible for executing the returned shutdown function on exit.
func NewDBForTestWithDatabase(t *testing.T, database string) (*sql.DB, func()) {
ts, err := NewTestServer()
if err != nil {
t.Fatal(err)
}
err = ts.Start()
if err != nil {
t.Fatal(err)
}
url := ts.PGURL()
if url == nil {
t.Fatalf("url not found")
}
if len(database) > 0 {
url.Path = database
}
db, err := sql.Open("postgres", url.String())
if err != nil {
t.Fatal(err)
}
ts.WaitForInit(db)
return db, func() {
_ = db.Close()
ts.Stop()
}
}
// NewTestServer creates a new TestServer, but does not start it.
// The cockroach binary for your OS and ARCH is downloaded automatically.
// If the download fails, we attempt just call "cockroach", hoping it is
// found in your path.
func NewTestServer() (*TestServer, error) {
cockroachBinary, err := downloadLatestBinary()
if err == nil {
log.Printf("Using automatically-downloaded binary: %s", cockroachBinary)
} else {
log.Printf("Attempting to use cockroach binary from your PATH")
cockroachBinary = "cockroach"
}
// Force "/tmp/" so avoid OSX's really long temp directory names
// which get us over the socket filename length limit.
baseDir, err := ioutil.TempDir("/tmp", "cockroach-testserver")
if err != nil {
return nil, fmt.Errorf("could not create temp directory: %s", err)
}
logDir := filepath.Join(baseDir, "logs")
if err := os.MkdirAll(logDir, 0755); err != nil {
return nil, fmt.Errorf("could not create logs directory: %s: %s", logDir, err)
}
options := url.Values{
"host": []string{baseDir},
}
pgurl := &url.URL{
Scheme: "postgres",
User: url.User("root"),
Host: fmt.Sprintf(":%d", socketPort),
RawQuery: options.Encode(),
}
socketPath := filepath.Join(baseDir, fmt.Sprintf("%s.%d", socketFileBase, socketPort))
args := []string{
cockroachBinary,
"start",
"--logtostderr",
"--insecure",
"--port=0",
"--http-port=0",
"--socket=" + socketPath,
"--store=" + baseDir,
}
ts := &TestServer{
baseDir: baseDir,
pgURL: pgurl,
args: args,
stdout: filepath.Join(logDir, "cockroach.stdout"),
stderr: filepath.Join(logDir, "cockroach.stderr"),
}
return ts, nil
}
// Stdout returns the entire contents of the process' stdout.
func (ts *TestServer) Stdout() string {
return ts.stdoutBuf.String()
}
// Stderr returns the entire contents of the process' stderr.
func (ts *TestServer) Stderr() string {
return ts.stderrBuf.String()
}
// PGURL returns the postgres connection URL to reach the started
// cockroach node.
// It loops until the expected unix socket file exists.
// This does not timeout, relying instead on test timeouts.
func (ts *TestServer) PGURL() *url.URL {
socketPath := filepath.Join(ts.baseDir, fmt.Sprintf("%s.%d", socketFileBase, socketPort))
for {
if _, err := os.Stat(socketPath); err == nil {
return ts.pgURL
}
time.Sleep(time.Millisecond * 10)
}
return nil
}
// WaitForInit repeatedly looks up the list of databases until
// the "system" database exists. It ignores all errors as we are
// waiting for the process to start and complete initialization.
// This does not timeout, relying instead on test timeouts.
func (ts *TestServer) WaitForInit(db *sql.DB) {
for {
// We issue a query that fails both on connection errors and on the
// system database not existing.
if _, err := db.Query("SHOW DATABASES"); err == nil {
return
}
time.Sleep(time.Millisecond * 10)
}
}
// Start runs the process, returning an error on any problems,
// including being unable to start, but not unexpected failure.
// It should only be called once in the lifetime of a TestServer object.
func (ts *TestServer) Start() error {
ts.mu.Lock()
if ts.state != stateNew {
ts.mu.Unlock()
return errors.New("Start() can only be called once")
}
ts.state = stateRunning
ts.mu.Unlock()
ts.cmd = exec.Command(ts.args[0], ts.args[1:]...)
ts.cmd.Env = []string{"COCKROACH_MAX_OFFSET=1ns"}
if len(ts.stdout) > 0 {
wr, err := newFileLogWriter(ts.stdout)
if err != nil {
return fmt.Errorf("unable to open file %s: %s", ts.stdout, err)
}
ts.stdoutBuf = wr
}
ts.cmd.Stdout = ts.stdoutBuf
if len(ts.stderr) > 0 {
wr, err := newFileLogWriter(ts.stderr)
if err != nil {
return fmt.Errorf("unable to open file %s: %s", ts.stderr, err)
}
ts.stderrBuf = wr
}
ts.cmd.Stderr = ts.stderrBuf
for k, v := range defaultEnv() {
ts.cmd.Env = append(ts.cmd.Env, k+"="+v)
}
err := ts.cmd.Start()
if ts.cmd.Process != nil {
log.Printf("process %d started: %s", ts.cmd.Process.Pid, strings.Join(ts.args, " "))
}
if err != nil {
log.Printf(err.Error())
ts.stdoutBuf.Close()
ts.stderrBuf.Close()
ts.mu.Lock()
ts.state = stateFailed
ts.mu.Unlock()
return fmt.Errorf("failure starting process: %s", err)
}
go func() {
ts.cmd.Wait()
ts.stdoutBuf.Close()
ts.stderrBuf.Close()
ps := ts.cmd.ProcessState
sy := ps.Sys().(syscall.WaitStatus)
log.Printf("Process %d exited with status %d", ps.Pid(), sy.ExitStatus())
log.Printf(ps.String())
ts.mu.Lock()
if sy.ExitStatus() == 0 {
ts.state = stateStopped
} else {
ts.state = stateFailed
}
ts.mu.Unlock()
}()
return nil
}
// Stop kills the process if it is still running and cleans its directory.
// It should only be called once in the lifetime of a TestServer object.
// Logs fatal if the process has already failed.
func (ts *TestServer) Stop() {
ts.mu.RLock()
defer ts.mu.RUnlock()
if ts.state == stateNew {
log.Fatal("Stop() called, but Start() was never called")
}
if ts.state == stateFailed {
log.Fatalf("Stop() called, but process exited unexpectedly. Stdout:\n%s\nStderr:\n%s\n",
ts.Stdout(), ts.Stderr())
return
}
if ts.state != stateStopped {
// Only call kill if not running. It could have exited properly.
ts.cmd.Process.Kill()
}
// Only cleanup on intentional stops.
_ = os.RemoveAll(ts.baseDir)
}
type logWriter interface {
Write(p []byte) (n int, err error)
String() string
Len() int64
Close()
}
type fileLogWriter struct {
filename string
file *os.File
}
func newFileLogWriter(file string) (*fileLogWriter, error) {
f, err := os.Create(file)
if err != nil {
return nil, err
}
return &fileLogWriter{
filename: file,
file: f,
}, nil
}
func (w fileLogWriter) Close() {
w.file.Close()
}
func (w fileLogWriter) Write(p []byte) (n int, err error) {
return w.file.Write(p)
}
func (w fileLogWriter) String() string {
b, err := ioutil.ReadFile(w.filename)
if err == nil {
return string(b)
}
return ""
}
func (w fileLogWriter) Len() int64 {
s, err := os.Stat(w.filename)
if err == nil {
return s.Size()
}
return 0
}
func defaultEnv() map[string]string {
vars := map[string]string{}
u, err := user.Current()
if err == nil {
if _, ok := vars["USER"]; !ok {
vars["USER"] = u.Username
}
if _, ok := vars["UID"]; !ok {
vars["UID"] = u.Uid
}
if _, ok := vars["GID"]; !ok {
vars["GID"] = u.Gid
}
if _, ok := vars["HOME"]; !ok {
vars["HOME"] = u.HomeDir
}
}
if _, ok := vars["PATH"]; !ok {
vars["PATH"] = os.Getenv("PATH")
}
return vars
}