func TestNewConnPool(t *testing.T) {
t.Parallel()
var numCallbacks int
afterConnect := func(c *pgx.Conn) error {
numCallbacks++
return nil
}
config := pgx.ConnPoolConfig{ConnConfig: *defaultConnConfig, MaxConnections: 2, AfterConnect: afterConnect}
pool, err := pgx.NewConnPool(config)
if err != nil {
t.Fatal("Unable to establish connection pool")
}
defer pool.Close()
// It initially connects once
stat := pool.Stat()
if stat.CurrentConnections != 1 {
t.Errorf("Expected 1 connection to be established immediately, but %v were", numCallbacks)
}
// Pool creation returns an error if any AfterConnect callback does
errAfterConnect := errors.New("Some error")
afterConnect = func(c *pgx.Conn) error {
return errAfterConnect
}
config = pgx.ConnPoolConfig{ConnConfig: *defaultConnConfig, MaxConnections: 2, AfterConnect: afterConnect}
pool, err = pgx.NewConnPool(config)
if err != errAfterConnect {
t.Errorf("Expected errAfterConnect but received unexpected: %v", err)
}
}
func main() {
var err error
connPoolConfig := pgx.ConnPoolConfig{
ConnConfig: pgx.ConnConfig{
Host: "127.0.0.1",
User: "******",
Password: "******",
Database: "url_shortener",
Logger: log.New("module", "pgx"),
},
MaxConnections: 5,
AfterConnect: afterConnect,
}
pool, err = pgx.NewConnPool(connPoolConfig)
if err != nil {
log.Crit("Unable to create connection pool", "error", err)
os.Exit(1)
}
http.HandleFunc("/", urlHandler)
log.Info("Starting URL shortener on localhost:8080")
err = http.ListenAndServe("localhost:8080", nil)
if err != nil {
log.Crit("Unable to start web server", "error", err)
os.Exit(1)
}
}
func createConnPool(t *testing.T, maxConnections int) *pgx.ConnPool {
config := pgx.ConnPoolConfig{ConnConfig: *defaultConnConfig, MaxConnections: maxConnections}
pool, err := pgx.NewConnPool(config)
if err != nil {
t.Fatalf("Unable to create connection pool: %v", err)
}
return pool
}
func TestNewConnPoolMaxConnectionsCannotBeLessThan2(t *testing.T) {
t.Parallel()
config := pgx.ConnPoolConfig{ConnConfig: *defaultConnConfig, MaxConnections: 1}
pool, err := pgx.NewConnPool(config)
if err == nil {
pool.Close()
t.Fatal(`Expected NewConnPool to fail with "MaxConnections must be at least 2" error, but it succeeded`)
}
if err.Error() != "MaxConnections must be at least 2" {
t.Fatalf(`Expected NewConnPool to fail with "MaxConnections must be at least 2" error, but it failed with %v`, err)
}
}
func TestNewConnPoolDefaultsTo5MaxConnections(t *testing.T) {
t.Parallel()
config := pgx.ConnPoolConfig{ConnConfig: *defaultConnConfig}
pool, err := pgx.NewConnPool(config)
if err != nil {
t.Fatal("Unable to establish connection pool")
}
defer pool.Close()
if n := pool.Stat().MaxConnections; n != 5 {
t.Fatalf("Expected pool to default to 5 max connections, but it was %d", n)
}
}
func BenchmarkConnPool(b *testing.B) {
config := pgx.ConnPoolConfig{ConnConfig: *defaultConnConfig, MaxConnections: 5}
pool, err := pgx.NewConnPool(config)
if err != nil {
b.Fatalf("Unable to create connection pool: %v", err)
}
defer pool.Close()
b.ResetTimer()
for i := 0; i < b.N; i++ {
var conn *pgx.Conn
if conn, err = pool.Acquire(); err != nil {
b.Fatalf("Unable to acquire connection: %v", err)
}
pool.Release(conn)
}
}
func main() {
var keys []*tufdata.Key
if err := json.Unmarshal([]byte(os.Getenv("ROOT_KEYS")), &keys); err != nil {
log.Fatal("missing or invalid ROOT_KEYS:", err)
}
opts := &tuf.HTTPRemoteOptions{
UserAgent: "cli-redirect/v1",
}
remote, err := tuf.HTTPRemoteStore(os.Getenv("REPO_URL"), opts)
if err != nil {
log.Fatal("error initializing remote store:", err)
}
r := &redirector{
RepoURL: os.Getenv("REPO_URL"),
Client: tuf.NewClient(tuf.MemoryLocalStore(), remote),
refresh: make(chan struct{}, 1),
notify: make(chan struct{}, 1),
}
if err := r.Client.Init(keys, len(keys)); err != nil {
log.Fatal("error initializing client:", err)
}
if _, err := r.Client.Update(); err != nil {
log.Fatal("error running first update:", err)
}
targets, err := r.Client.Targets()
if err != nil {
log.Fatal("error getting targets:", err)
}
r.Targets.Store(targets)
pgConf, err := pgx.ParseURI(os.Getenv("DATABASE_URL"))
if err != nil {
log.Fatal("error parsing DATABASE_URL:", err)
}
r.DB, err = pgx.NewConnPool(pgx.ConnPoolConfig{ConnConfig: pgConf})
if err != nil {
log.Fatal("error creating pgx pool:", err)
}
go r.pgListener()
go r.pgNotifier()
go r.tufLoader()
log.Fatal(http.ListenAndServe(":"+os.Getenv("PORT"), r))
}
func main() {
var err error
pool, err = pgx.NewConnPool(extractConfig())
if err != nil {
fmt.Fprintln(os.Stderr, "Unable to connect to database:", err)
os.Exit(1)
}
go listen()
fmt.Println(`Type a message and press enter.
This message should appear in any other chat instances connected to the same
database.
Type "exit" to quit.
`)
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
msg := scanner.Text()
if msg == "exit" {
os.Exit(0)
}
_, err = pool.Exec("select pg_notify('chat', $1)", msg)
if err != nil {
fmt.Fprintln(os.Stderr, "Error sending notification:", err)
os.Exit(1)
}
}
if err := scanner.Err(); err != nil {
fmt.Fprintln(os.Stderr, "Error scanning from stdin:", err)
os.Exit(1)
}
}