pgx/conn_test.go

package pgx_test

import (
	"crypto/tls"
	"fmt"
	"golang.org/x/net/context"
	"net"
	"os"
	"reflect"
	"strconv"
	"strings"
	"sync"
	"testing"
	"time"

	"github.com/jackc/pgx"
)

func TestConnect(t *testing.T) {
	t.Parallel()

	conn, err := pgx.Connect(*defaultConnConfig)
	if err != nil {
		t.Fatalf("Unable to establish connection: %v", err)
	}

	if _, present := conn.RuntimeParams["server_version"]; !present {
		t.Error("Runtime parameters not stored")
	}

	if conn.PID() == 0 {
		t.Error("Backend PID not stored")
	}

	if conn.SecretKey == 0 {
		t.Error("Backend secret key not stored")
	}

	var currentDB string
	err = conn.QueryRow("select current_database()").Scan(&currentDB)
	if err != nil {
		t.Fatalf("QueryRow Scan unexpectedly failed: %v", err)
	}
	if currentDB != defaultConnConfig.Database {
		t.Errorf("Did not connect to specified database (%v)", defaultConnConfig.Database)
	}

	var user string
	err = conn.QueryRow("select current_user").Scan(&user)
	if err != nil {
		t.Fatalf("QueryRow Scan unexpectedly failed: %v", err)
	}
	if user != defaultConnConfig.User {
		t.Errorf("Did not connect as specified user (%v)", defaultConnConfig.User)
	}

	err = conn.Close()
	if err != nil {
		t.Fatal("Unable to close connection")
	}
}

func TestConnectWithUnixSocketDirectory(t *testing.T) {
	t.Parallel()

	// /.s.PGSQL.5432
	if unixSocketConnConfig == nil {
		t.Skip("Skipping due to undefined unixSocketConnConfig")
	}

	conn, err := pgx.Connect(*unixSocketConnConfig)
	if err != nil {
		t.Fatalf("Unable to establish connection: %v", err)
	}

	err = conn.Close()
	if err != nil {
		t.Fatal("Unable to close connection")
	}
}

func TestConnectWithUnixSocketFile(t *testing.T) {
	t.Parallel()

	if unixSocketConnConfig == nil {
		t.Skip("Skipping due to undefined unixSocketConnConfig")
	}

	connParams := *unixSocketConnConfig
	connParams.Host = connParams.Host + "/.s.PGSQL.5432"
	conn, err := pgx.Connect(connParams)
	if err != nil {
		t.Fatalf("Unable to establish connection: %v", err)
	}

	err = conn.Close()
	if err != nil {
		t.Fatal("Unable to close connection")
	}
}

func TestConnectWithTcp(t *testing.T) {
	t.Parallel()

	if tcpConnConfig == nil {
		t.Skip("Skipping due to undefined tcpConnConfig")
	}

	conn, err := pgx.Connect(*tcpConnConfig)
	if err != nil {
		t.Fatal("Unable to establish connection: " + err.Error())
	}

	err = conn.Close()
	if err != nil {
		t.Fatal("Unable to close connection")
	}
}

func TestConnectWithTLS(t *testing.T) {
	t.Parallel()

	if tlsConnConfig == nil {
		t.Skip("Skipping due to undefined tlsConnConfig")
	}

	conn, err := pgx.Connect(*tlsConnConfig)
	if err != nil {
		t.Fatal("Unable to establish connection: " + err.Error())
	}

	err = conn.Close()
	if err != nil {
		t.Fatal("Unable to close connection")
	}
}

func TestConnectWithInvalidUser(t *testing.T) {
	t.Parallel()

	if invalidUserConnConfig == nil {
		t.Skip("Skipping due to undefined invalidUserConnConfig")
	}

	_, err := pgx.Connect(*invalidUserConnConfig)
	pgErr, ok := err.(pgx.PgError)
	if !ok {
		t.Fatalf("Expected to receive a PgError with code 28000, instead received: %v", err)
	}
	if pgErr.Code != "28000" && pgErr.Code != "28P01" {
		t.Fatalf("Expected to receive a PgError with code 28000 or 28P01, instead received: %v", pgErr)
	}
}

func TestConnectWithPlainTextPassword(t *testing.T) {
	t.Parallel()

	if plainPasswordConnConfig == nil {
		t.Skip("Skipping due to undefined plainPasswordConnConfig")
	}

	conn, err := pgx.Connect(*plainPasswordConnConfig)
	if err != nil {
		t.Fatal("Unable to establish connection: " + err.Error())
	}

	err = conn.Close()
	if err != nil {
		t.Fatal("Unable to close connection")
	}
}

func TestConnectWithMD5Password(t *testing.T) {
	t.Parallel()

	if md5ConnConfig == nil {
		t.Skip("Skipping due to undefined md5ConnConfig")
	}

	conn, err := pgx.Connect(*md5ConnConfig)
	if err != nil {
		t.Fatal("Unable to establish connection: " + err.Error())
	}

	err = conn.Close()
	if err != nil {
		t.Fatal("Unable to close connection")
	}
}

func TestConnectWithTLSFallback(t *testing.T) {
	t.Parallel()

	if tlsConnConfig == nil {
		t.Skip("Skipping due to undefined tlsConnConfig")
	}

	connConfig := *tlsConnConfig
	connConfig.TLSConfig = &tls.Config{ServerName: "bogus.local"} // bogus ServerName should ensure certificate validation failure

	conn, err := pgx.Connect(connConfig)
	if err == nil {
		t.Fatal("Expected failed connection, but succeeded")
	}

	connConfig.UseFallbackTLS = true
	connConfig.FallbackTLSConfig = &tls.Config{InsecureSkipVerify: true}

	conn, err = pgx.Connect(connConfig)
	if err != nil {
		t.Fatal("Unable to establish connection: " + err.Error())
	}

	err = conn.Close()
	if err != nil {
		t.Fatal("Unable to close connection")
	}
}

func TestConnectWithConnectionRefused(t *testing.T) {
	t.Parallel()

	// Presumably nothing is listening on 127.0.0.1:1
	bad := *defaultConnConfig
	bad.Host = "127.0.0.1"
	bad.Port = 1

	_, err := pgx.Connect(bad)
	if err == nil {
		t.Fatal("Expected error establishing connection to bad port")
	}
}

func TestConnectCustomDialer(t *testing.T) {
	t.Parallel()

	if customDialerConnConfig == nil {
		t.Skip("Skipping due to undefined customDialerConnConfig")
	}

	dialled := false
	conf := *customDialerConnConfig
	conf.Dial = func(network, address string) (net.Conn, error) {
		dialled = true
		return net.Dial(network, address)
	}

	conn, err := pgx.Connect(conf)
	if err != nil {
		t.Fatalf("Unable to establish connection: %s", err)
	}
	if !dialled {
		t.Fatal("Connect did not use custom dialer")
	}

	err = conn.Close()
	if err != nil {
		t.Fatal("Unable to close connection")
	}
}

func TestConnectWithRuntimeParams(t *testing.T) {
	t.Parallel()

	connConfig := *defaultConnConfig
	connConfig.RuntimeParams = map[string]string{
		"application_name": "pgxtest",
		"search_path":      "myschema",
	}

	conn, err := pgx.Connect(connConfig)
	if err != nil {
		t.Fatalf("Unable to establish connection: %v", err)
	}
	defer conn.Close()

	var s string
	err = conn.QueryRow("show application_name").Scan(&s)
	if err != nil {
		t.Fatalf("QueryRow Scan unexpectedly failed: %v", err)
	}
	if s != "pgxtest" {
		t.Errorf("Expected application_name to be %s, but it was %s", "pgxtest", s)
	}

	err = conn.QueryRow("show search_path").Scan(&s)
	if err != nil {
		t.Fatalf("QueryRow Scan unexpectedly failed: %v", err)
	}
	if s != "myschema" {
		t.Errorf("Expected search_path to be %s, but it was %s", "myschema", s)
	}
}

func TestParseURI(t *testing.T) {
	t.Parallel()

	tests := []struct {
		url        string
		connParams pgx.ConnConfig
	}{
		{
			url: "postgres://jack:secret@localhost:5432/mydb?sslmode=prefer",
			connParams: pgx.ConnConfig{
				User:     "jack",
				Password: "secret",
				Host:     "localhost",
				Port:     5432,
				Database: "mydb",
				TLSConfig: &tls.Config{
					InsecureSkipVerify: true,
				},
				UseFallbackTLS:    true,
				FallbackTLSConfig: nil,
				RuntimeParams:     map[string]string{},
			},
		},
		{
			url: "postgres://jack:secret@localhost:5432/mydb?sslmode=disable",
			connParams: pgx.ConnConfig{
				User:              "jack",
				Password:          "secret",
				Host:              "localhost",
				Port:              5432,
				Database:          "mydb",
				TLSConfig:         nil,
				UseFallbackTLS:    false,
				FallbackTLSConfig: nil,
				RuntimeParams:     map[string]string{},
			},
		},
		{
			url: "postgres://jack:secret@localhost:5432/mydb",
			connParams: pgx.ConnConfig{
				User:     "jack",
				Password: "secret",
				Host:     "localhost",
				Port:     5432,
				Database: "mydb",
				TLSConfig: &tls.Config{
					InsecureSkipVerify: true,
				},
				UseFallbackTLS:    true,
				FallbackTLSConfig: nil,
				RuntimeParams:     map[string]string{},
			},
		},
		{
			url: "postgresql://jack:secret@localhost:5432/mydb",
			connParams: pgx.ConnConfig{
				User:     "jack",
				Password: "secret",
				Host:     "localhost",
				Port:     5432,
				Database: "mydb",
				TLSConfig: &tls.Config{
					InsecureSkipVerify: true,
				},
				UseFallbackTLS:    true,
				FallbackTLSConfig: nil,
				RuntimeParams:     map[string]string{},
			},
		},
		{
			url: "postgres://jack@localhost:5432/mydb",
			connParams: pgx.ConnConfig{
				User:     "jack",
				Host:     "localhost",
				Port:     5432,
				Database: "mydb",
				TLSConfig: &tls.Config{
					InsecureSkipVerify: true,
				},
				UseFallbackTLS:    true,
				FallbackTLSConfig: nil,
				RuntimeParams:     map[string]string{},
			},
		},
		{
			url: "postgres://jack@localhost/mydb",
			connParams: pgx.ConnConfig{
				User:     "jack",
				Host:     "localhost",
				Database: "mydb",
				TLSConfig: &tls.Config{
					InsecureSkipVerify: true,
				},
				UseFallbackTLS:    true,
				FallbackTLSConfig: nil,
				RuntimeParams:     map[string]string{},
			},
		},
		{
			url: "postgres://jack@localhost/mydb?application_name=pgxtest&search_path=myschema",
			connParams: pgx.ConnConfig{
				User:     "jack",
				Host:     "localhost",
				Database: "mydb",
				TLSConfig: &tls.Config{
					InsecureSkipVerify: true,
				},
				UseFallbackTLS:    true,
				FallbackTLSConfig: nil,
				RuntimeParams: map[string]string{
					"application_name": "pgxtest",
					"search_path":      "myschema",
				},
			},
		},
	}

	for i, tt := range tests {
		connParams, err := pgx.ParseURI(tt.url)
		if err != nil {
			t.Errorf("%d. Unexpected error from pgx.ParseURL(%q) => %v", i, tt.url, err)
			continue
		}

		if !reflect.DeepEqual(connParams, tt.connParams) {
			t.Errorf("%d. expected %#v got %#v", i, tt.connParams, connParams)
		}
	}
}

func TestParseDSN(t *testing.T) {
	t.Parallel()

	tests := []struct {
		url        string
		connParams pgx.ConnConfig
	}{
		{
			url: "user=jack password=secret host=localhost port=5432 dbname=mydb sslmode=disable",
			connParams: pgx.ConnConfig{
				User:          "jack",
				Password:      "secret",
				Host:          "localhost",
				Port:          5432,
				Database:      "mydb",
				RuntimeParams: map[string]string{},
			},
		},
		{
			url: "user=jack password=secret host=localhost port=5432 dbname=mydb sslmode=prefer",
			connParams: pgx.ConnConfig{
				User:     "jack",
				Password: "secret",
				Host:     "localhost",
				Port:     5432,
				Database: "mydb",
				TLSConfig: &tls.Config{
					InsecureSkipVerify: true,
				},
				UseFallbackTLS:    true,
				FallbackTLSConfig: nil,
				RuntimeParams:     map[string]string{},
			},
		},
		{
			url: "user=jack password=secret host=localhost port=5432 dbname=mydb",
			connParams: pgx.ConnConfig{
				User:     "jack",
				Password: "secret",
				Host:     "localhost",
				Port:     5432,
				Database: "mydb",
				TLSConfig: &tls.Config{
					InsecureSkipVerify: true,
				},
				UseFallbackTLS:    true,
				FallbackTLSConfig: nil,
				RuntimeParams:     map[string]string{},
			},
		},
		{
			url: "user=jack host=localhost port=5432 dbname=mydb",
			connParams: pgx.ConnConfig{
				User:     "jack",
				Host:     "localhost",
				Port:     5432,
				Database: "mydb",
				TLSConfig: &tls.Config{
					InsecureSkipVerify: true,
				},
				UseFallbackTLS:    true,
				FallbackTLSConfig: nil,
				RuntimeParams:     map[string]string{},
			},
		},
		{
			url: "user=jack host=localhost dbname=mydb",
			connParams: pgx.ConnConfig{
				User:     "jack",
				Host:     "localhost",
				Database: "mydb",
				TLSConfig: &tls.Config{
					InsecureSkipVerify: true,
				},
				UseFallbackTLS:    true,
				FallbackTLSConfig: nil,
				RuntimeParams:     map[string]string{},
			},
		},
		{
			url: "user=jack host=localhost dbname=mydb application_name=pgxtest search_path=myschema",
			connParams: pgx.ConnConfig{
				User:     "jack",
				Host:     "localhost",
				Database: "mydb",
				TLSConfig: &tls.Config{
					InsecureSkipVerify: true,
				},
				UseFallbackTLS:    true,
				FallbackTLSConfig: nil,
				RuntimeParams: map[string]string{
					"application_name": "pgxtest",
					"search_path":      "myschema",
				},
			},
		},
	}

	for i, tt := range tests {
		connParams, err := pgx.ParseDSN(tt.url)
		if err != nil {
			t.Errorf("%d. Unexpected error from pgx.ParseDSN(%q) => %v", i, tt.url, err)
			continue
		}

		if !reflect.DeepEqual(connParams, tt.connParams) {
			t.Errorf("%d. expected %#v got %#v", i, tt.connParams, connParams)
		}
	}
}

func TestParseEnvLibpq(t *testing.T) {
	pgEnvvars := []string{"PGHOST", "PGPORT", "PGDATABASE", "PGUSER", "PGPASSWORD", "PGAPPNAME"}

	savedEnv := make(map[string]string)
	for _, n := range pgEnvvars {
		savedEnv[n] = os.Getenv(n)
	}
	defer func() {
		for k, v := range savedEnv {
			err := os.Setenv(k, v)
			if err != nil {
				t.Fatalf("Unable to restore environment: %v", err)
			}
		}
	}()

	tests := []struct {
		name    string
		envvars map[string]string
		config  pgx.ConnConfig
	}{
		{
			name:    "No environment",
			envvars: map[string]string{},
			config: pgx.ConnConfig{
				TLSConfig:         &tls.Config{InsecureSkipVerify: true},
				UseFallbackTLS:    true,
				FallbackTLSConfig: nil,
				RuntimeParams:     map[string]string{},
			},
		},
		{
			name: "Normal PG vars",
			envvars: map[string]string{
				"PGHOST":     "123.123.123.123",
				"PGPORT":     "7777",
				"PGDATABASE": "foo",
				"PGUSER":     "bar",
				"PGPASSWORD": "baz",
			},
			config: pgx.ConnConfig{
				Host:              "123.123.123.123",
				Port:              7777,
				Database:          "foo",
				User:              "bar",
				Password:          "baz",
				TLSConfig:         &tls.Config{InsecureSkipVerify: true},
				UseFallbackTLS:    true,
				FallbackTLSConfig: nil,
				RuntimeParams:     map[string]string{},
			},
		},
		{
			name: "application_name",
			envvars: map[string]string{
				"PGAPPNAME": "pgxtest",
			},
			config: pgx.ConnConfig{
				TLSConfig:         &tls.Config{InsecureSkipVerify: true},
				UseFallbackTLS:    true,
				FallbackTLSConfig: nil,
				RuntimeParams:     map[string]string{"application_name": "pgxtest"},
			},
		},
		{
			name: "sslmode=disable",
			envvars: map[string]string{
				"PGSSLMODE": "disable",
			},
			config: pgx.ConnConfig{
				TLSConfig:      nil,
				UseFallbackTLS: false,
				RuntimeParams:  map[string]string{},
			},
		},
		{
			name: "sslmode=allow",
			envvars: map[string]string{
				"PGSSLMODE": "allow",
			},
			config: pgx.ConnConfig{
				TLSConfig:         nil,
				UseFallbackTLS:    true,
				FallbackTLSConfig: &tls.Config{InsecureSkipVerify: true},
				RuntimeParams:     map[string]string{},
			},
		},
		{
			name: "sslmode=prefer",
			envvars: map[string]string{
				"PGSSLMODE": "prefer",
			},
			config: pgx.ConnConfig{
				TLSConfig:         &tls.Config{InsecureSkipVerify: true},
				UseFallbackTLS:    true,
				FallbackTLSConfig: nil,
				RuntimeParams:     map[string]string{},
			},
		},
		{
			name: "sslmode=require",
			envvars: map[string]string{
				"PGSSLMODE": "require",
			},
			config: pgx.ConnConfig{
				TLSConfig:      &tls.Config{},
				UseFallbackTLS: false,
				RuntimeParams:  map[string]string{},
			},
		},
		{
			name: "sslmode=verify-ca",
			envvars: map[string]string{
				"PGSSLMODE": "verify-ca",
			},
			config: pgx.ConnConfig{
				TLSConfig:      &tls.Config{},
				UseFallbackTLS: false,
				RuntimeParams:  map[string]string{},
			},
		},
		{
			name: "sslmode=verify-full",
			envvars: map[string]string{
				"PGSSLMODE": "verify-full",
			},
			config: pgx.ConnConfig{
				TLSConfig:      &tls.Config{},
				UseFallbackTLS: false,
				RuntimeParams:  map[string]string{},
			},
		},
		{
			name: "sslmode=verify-full with host",
			envvars: map[string]string{
				"PGHOST":    "pgx.example",
				"PGSSLMODE": "verify-full",
			},
			config: pgx.ConnConfig{
				Host: "pgx.example",
				TLSConfig: &tls.Config{
					ServerName: "pgx.example",
				},
				UseFallbackTLS: false,
				RuntimeParams:  map[string]string{},
			},
		},
	}

	for _, tt := range tests {
		for _, n := range pgEnvvars {
			err := os.Unsetenv(n)
			if err != nil {
				t.Fatalf("%s: Unable to clear environment: %v", tt.name, err)
			}
		}

		for k, v := range tt.envvars {
			err := os.Setenv(k, v)
			if err != nil {
				t.Fatalf("%s: Unable to set environment: %v", tt.name, err)
			}
		}

		config, err := pgx.ParseEnvLibpq()
		if err != nil {
			t.Errorf("%s: Unexpected error from pgx.ParseLibpq() => %v", tt.name, err)
			continue
		}

		if config.Host != tt.config.Host {
			t.Errorf("%s: expected Host to be %v got %v", tt.name, tt.config.Host, config.Host)
		}
		if config.Port != tt.config.Port {
			t.Errorf("%s: expected Port to be %v got %v", tt.name, tt.config.Port, config.Port)
		}
		if config.Port != tt.config.Port {
			t.Errorf("%s: expected Port to be %v got %v", tt.name, tt.config.Port, config.Port)
		}
		if config.User != tt.config.User {
			t.Errorf("%s: expected User to be %v got %v", tt.name, tt.config.User, config.User)
		}
		if config.Password != tt.config.Password {
			t.Errorf("%s: expected Password to be %v got %v", tt.name, tt.config.Password, config.Password)
		}

		if !reflect.DeepEqual(config.RuntimeParams, tt.config.RuntimeParams) {
			t.Errorf("%s: expected RuntimeParams to be %#v got %#v", tt.name, tt.config.RuntimeParams, config.RuntimeParams)
		}

		tlsTests := []struct {
			name     string
			expected *tls.Config
			actual   *tls.Config
		}{
			{
				name:     "TLSConfig",
				expected: tt.config.TLSConfig,
				actual:   config.TLSConfig,
			},
			{
				name:     "FallbackTLSConfig",
				expected: tt.config.FallbackTLSConfig,
				actual:   config.FallbackTLSConfig,
			},
		}
		for _, tlsTest := range tlsTests {
			name := tlsTest.name
			expected := tlsTest.expected
			actual := tlsTest.actual

			if expected == nil && actual != nil {
				t.Errorf("%s / %s: expected nil, but it was set", tt.name, name)
			} else if expected != nil && actual == nil {
				t.Errorf("%s / %s: expected to be set, but got nil", tt.name, name)
			} else if expected != nil && actual != nil {
				if actual.InsecureSkipVerify != expected.InsecureSkipVerify {
					t.Errorf("%s / %s: expected InsecureSkipVerify to be %v got %v", tt.name, name, expected.InsecureSkipVerify, actual.InsecureSkipVerify)
				}

				if actual.ServerName != expected.ServerName {
					t.Errorf("%s / %s: expected ServerName to be %v got %v", tt.name, name, expected.ServerName, actual.ServerName)
				}
			}
		}

		if config.UseFallbackTLS != tt.config.UseFallbackTLS {
			t.Errorf("%s: expected UseFallbackTLS to be %v got %v", tt.name, tt.config.UseFallbackTLS, config.UseFallbackTLS)
		}
	}
}

func TestExec(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	if results := mustExec(t, conn, "create temporary table foo(id integer primary key);"); results != "CREATE TABLE" {
		t.Error("Unexpected results from Exec")
	}

	// Accept parameters
	if results := mustExec(t, conn, "insert into foo(id) values($1)", 1); results != "INSERT 0 1" {
		t.Errorf("Unexpected results from Exec: %v", results)
	}

	if results := mustExec(t, conn, "drop table foo;"); results != "DROP TABLE" {
		t.Error("Unexpected results from Exec")
	}

	// Multiple statements can be executed -- last command tag is returned
	if results := mustExec(t, conn, "create temporary table foo(id serial primary key); drop table foo;"); results != "DROP TABLE" {
		t.Error("Unexpected results from Exec")
	}

	// Can execute longer SQL strings than sharedBufferSize
	if results := mustExec(t, conn, strings.Repeat("select 42; ", 1000)); results != "SELECT 1" {
		t.Errorf("Unexpected results from Exec: %v", results)
	}

	// Exec no-op which does not return a command tag
	if results := mustExec(t, conn, "--;"); results != "" {
		t.Errorf("Unexpected results from Exec: %v", results)
	}
}

func TestExecFailure(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	if _, err := conn.Exec("selct;"); err == nil {
		t.Fatal("Expected SQL syntax error")
	}

	rows, _ := conn.Query("select 1")
	rows.Close()
	if rows.Err() != nil {
		t.Fatalf("Exec failure appears to have broken connection: %v", rows.Err())
	}
}

func TestExecContextWithoutCancelation(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	ctx, cancelFunc := context.WithCancel(context.Background())
	defer cancelFunc()

	commandTag, err := conn.ExecContext(ctx, "create temporary table foo(id integer primary key);")
	if err != nil {
		t.Fatal(err)
	}
	if commandTag != "CREATE TABLE" {
		t.Fatalf("Unexpected results from ExecContext: %v", commandTag)
	}
}

func TestExecContextFailureWithoutCancelation(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	ctx, cancelFunc := context.WithCancel(context.Background())
	defer cancelFunc()

	if _, err := conn.ExecContext(ctx, "selct;"); err == nil {
		t.Fatal("Expected SQL syntax error")
	}

	rows, _ := conn.Query("select 1")
	rows.Close()
	if rows.Err() != nil {
		t.Fatalf("ExecContext failure appears to have broken connection: %v", rows.Err())
	}
}

func TestExecContextCancelationCancelsQuery(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	ctx, cancelFunc := context.WithCancel(context.Background())
	go func() {
		time.Sleep(500 * time.Millisecond)
		cancelFunc()
	}()

	_, err := conn.ExecContext(ctx, "select pg_sleep(60)")
	if err != context.Canceled {
		t.Fatal("Expected context.Canceled err, got %v", err)
	}

	ensureConnValid(t, conn)
}

func TestPrepare(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	_, err := conn.Prepare("test", "select $1::varchar")
	if err != nil {
		t.Errorf("Unable to prepare statement: %v", err)
		return
	}

	var s string
	err = conn.QueryRow("test", "hello").Scan(&s)
	if err != nil {
		t.Errorf("Executing prepared statement failed: %v", err)
	}

	if s != "hello" {
		t.Errorf("Prepared statement did not return expected value: %v", s)
	}

	err = conn.Deallocate("test")
	if err != nil {
		t.Errorf("conn.Deallocate failed: %v", err)
	}

	// Create another prepared statement to ensure Deallocate left the connection
	// in a working state and that we can reuse the prepared statement name.

	_, err = conn.Prepare("test", "select $1::integer")
	if err != nil {
		t.Errorf("Unable to prepare statement: %v", err)
		return
	}

	var n int32
	err = conn.QueryRow("test", int32(1)).Scan(&n)
	if err != nil {
		t.Errorf("Executing prepared statement failed: %v", err)
	}

	if n != 1 {
		t.Errorf("Prepared statement did not return expected value: %v", s)
	}

	err = conn.Deallocate("test")
	if err != nil {
		t.Errorf("conn.Deallocate failed: %v", err)
	}
}

func TestPrepareBadSQLFailure(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	if _, err := conn.Prepare("badSQL", "select foo"); err == nil {
		t.Fatal("Prepare should have failed with syntax error")
	}

	ensureConnValid(t, conn)
}

func TestPrepareQueryManyParameters(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	tests := []struct {
		count   int
		succeed bool
	}{
		{
			count:   65534,
			succeed: true,
		},
		{
			count:   65535,
			succeed: true,
		},
		{
			count:   65536,
			succeed: false,
		},
		{
			count:   65537,
			succeed: false,
		},
	}

	for i, tt := range tests {
		params := make([]string, 0, tt.count)
		args := make([]interface{}, 0, tt.count)
		for j := 0; j < tt.count; j++ {
			params = append(params, fmt.Sprintf("($%d::text)", j+1))
			args = append(args, strconv.Itoa(j))
		}

		sql := "values" + strings.Join(params, ", ")

		psName := fmt.Sprintf("manyParams%d", i)
		_, err := conn.Prepare(psName, sql)
		if err != nil {
			if tt.succeed {
				t.Errorf("%d. %v", i, err)
			}
			continue
		}
		if !tt.succeed {
			t.Errorf("%d. Expected error but succeeded", i)
			continue
		}

		rows, err := conn.Query(psName, args...)
		if err != nil {
			t.Errorf("conn.Query failed: %v", err)
			continue
		}

		for rows.Next() {
			var s string
			rows.Scan(&s)
		}

		if rows.Err() != nil {
			t.Errorf("Reading query result failed: %v", err)
		}
	}

	ensureConnValid(t, conn)
}

func TestPrepareIdempotency(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	for i := 0; i < 2; i++ {
		_, err := conn.Prepare("test", "select 42::integer")
		if err != nil {
			t.Fatalf("%d. Unable to prepare statement: %v", i, err)
		}

		var n int32
		err = conn.QueryRow("test").Scan(&n)
		if err != nil {
			t.Errorf("%d. Executing prepared statement failed: %v", i, err)
		}

		if n != int32(42) {
			t.Errorf("%d. Prepared statement did not return expected value: %v", i, n)
		}
	}

	_, err := conn.Prepare("test", "select 'fail'::varchar")
	if err == nil {
		t.Fatalf("Prepare statement with same name but different SQL should have failed but it didn't")
		return
	}
}

func TestPrepareEx(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	_, err := conn.PrepareEx("test", "select $1", &pgx.PrepareExOptions{ParameterOIDs: []pgx.OID{pgx.TextOID}})
	if err != nil {
		t.Errorf("Unable to prepare statement: %v", err)
		return
	}

	var s string
	err = conn.QueryRow("test", "hello").Scan(&s)
	if err != nil {
		t.Errorf("Executing prepared statement failed: %v", err)
	}

	if s != "hello" {
		t.Errorf("Prepared statement did not return expected value: %v", s)
	}

	err = conn.Deallocate("test")
	if err != nil {
		t.Errorf("conn.Deallocate failed: %v", err)
	}
}

func TestListenNotify(t *testing.T) {
	t.Parallel()

	listener := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, listener)

	if err := listener.Listen("chat"); err != nil {
		t.Fatalf("Unable to start listening: %v", err)
	}

	notifier := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, notifier)

	mustExec(t, notifier, "notify chat")

	// when notification is waiting on the socket to be read
	notification, err := listener.WaitForNotification(context.Background())
	if err != nil {
		t.Fatalf("Unexpected error on WaitForNotification: %v", err)
	}
	if notification.Channel != "chat" {
		t.Errorf("Did not receive notification on expected channel: %v", notification.Channel)
	}

	// when notification has already been read during previous query
	mustExec(t, notifier, "notify chat")
	rows, _ := listener.Query("select 1")
	rows.Close()
	if rows.Err() != nil {
		t.Fatalf("Unexpected error on Query: %v", rows.Err())
	}

	ctx, cancelFn := context.WithCancel(context.Background())
	cancelFn()
	notification, err = listener.WaitForNotification(ctx)
	if err != nil {
		t.Fatalf("Unexpected error on WaitForNotification: %v", err)
	}
	if notification.Channel != "chat" {
		t.Errorf("Did not receive notification on expected channel: %v", notification.Channel)
	}

	// when timeout occurs
	ctx, _ = context.WithTimeout(context.Background(), time.Millisecond)
	notification, err = listener.WaitForNotification(ctx)
	if err != context.DeadlineExceeded {
		t.Errorf("WaitForNotification returned the wrong kind of error: %v", err)
	}
	if notification != nil {
		t.Errorf("WaitForNotification returned an unexpected notification: %v", notification)
	}

	// listener can listen again after a timeout
	mustExec(t, notifier, "notify chat")
	notification, err = listener.WaitForNotification(context.Background())
	if err != nil {
		t.Fatalf("Unexpected error on WaitForNotification: %v", err)
	}
	if notification.Channel != "chat" {
		t.Errorf("Did not receive notification on expected channel: %v", notification.Channel)
	}
}

func TestUnlistenSpecificChannel(t *testing.T) {
	t.Parallel()

	listener := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, listener)

	if err := listener.Listen("unlisten_test"); err != nil {
		t.Fatalf("Unable to start listening: %v", err)
	}

	notifier := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, notifier)

	mustExec(t, notifier, "notify unlisten_test")

	// when notification is waiting on the socket to be read
	notification, err := listener.WaitForNotification(context.Background())
	if err != nil {
		t.Fatalf("Unexpected error on WaitForNotification: %v", err)
	}
	if notification.Channel != "unlisten_test" {
		t.Errorf("Did not receive notification on expected channel: %v", notification.Channel)
	}

	err = listener.Unlisten("unlisten_test")
	if err != nil {
		t.Fatalf("Unexpected error on Unlisten: %v", err)
	}

	// when notification has already been read during previous query
	mustExec(t, notifier, "notify unlisten_test")
	rows, _ := listener.Query("select 1")
	rows.Close()
	if rows.Err() != nil {
		t.Fatalf("Unexpected error on Query: %v", rows.Err())
	}

	ctx, _ := context.WithTimeout(context.Background(), 100*time.Millisecond)
	notification, err = listener.WaitForNotification(ctx)
	if err != context.DeadlineExceeded {
		t.Errorf("WaitForNotification returned the wrong kind of error: %v", err)
	}
}

func TestListenNotifyWhileBusyIsSafe(t *testing.T) {
	t.Parallel()

	listenerDone := make(chan bool)
	go func() {
		conn := mustConnect(t, *defaultConnConfig)
		defer closeConn(t, conn)
		defer func() {
			listenerDone <- true
		}()

		if err := conn.Listen("busysafe"); err != nil {
			t.Fatalf("Unable to start listening: %v", err)
		}

		for i := 0; i < 5000; i++ {
			var sum int32
			var rowCount int32

			rows, err := conn.Query("select generate_series(1,$1)", 100)
			if err != nil {
				t.Fatalf("conn.Query failed: %v", err)
			}

			for rows.Next() {
				var n int32
				rows.Scan(&n)
				sum += n
				rowCount++
			}

			if rows.Err() != nil {
				t.Fatalf("conn.Query failed: %v", err)
			}

			if sum != 5050 {
				t.Fatalf("Wrong rows sum: %v", sum)
			}

			if rowCount != 100 {
				t.Fatalf("Wrong number of rows: %v", rowCount)
			}

			time.Sleep(1 * time.Microsecond)
		}
	}()

	notifierDone := make(chan bool)
	go func() {
		conn := mustConnect(t, *defaultConnConfig)
		defer closeConn(t, conn)
		defer func() {
			notifierDone <- true
		}()

		for i := 0; i < 100000; i++ {
			mustExec(t, conn, "notify busysafe, 'hello'")
			time.Sleep(1 * time.Microsecond)
		}
	}()

	<-listenerDone
}

func TestListenNotifySelfNotification(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	if err := conn.Listen("self"); err != nil {
		t.Fatalf("Unable to start listening: %v", err)
	}

	// Notify self and WaitForNotification immediately
	mustExec(t, conn, "notify self")

	ctx, _ := context.WithTimeout(context.Background(), time.Second)
	notification, err := conn.WaitForNotification(ctx)
	if err != nil {
		t.Fatalf("Unexpected error on WaitForNotification: %v", err)
	}
	if notification.Channel != "self" {
		t.Errorf("Did not receive notification on expected channel: %v", notification.Channel)
	}

	// Notify self and do something else before WaitForNotification
	mustExec(t, conn, "notify self")

	rows, _ := conn.Query("select 1")
	rows.Close()
	if rows.Err() != nil {
		t.Fatalf("Unexpected error on Query: %v", rows.Err())
	}

	ctx, _ = context.WithTimeout(context.Background(), time.Second)
	notification, err = conn.WaitForNotification(ctx)
	if err != nil {
		t.Fatalf("Unexpected error on WaitForNotification: %v", err)
	}
	if notification.Channel != "self" {
		t.Errorf("Did not receive notification on expected channel: %v", notification.Channel)
	}
}

func TestListenUnlistenSpecialCharacters(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	chanName := "special characters !@#{$%^&*()}"
	if err := conn.Listen(chanName); err != nil {
		t.Fatalf("Unable to start listening: %v", err)
	}

	if err := conn.Unlisten(chanName); err != nil {
		t.Fatalf("Unable to stop listening: %v", err)
	}
}

func TestFatalRxError(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	var wg sync.WaitGroup
	wg.Add(1)
	go func() {
		defer wg.Done()
		var n int32
		var s string
		err := conn.QueryRow("select 1::int4, pg_sleep(10)::varchar").Scan(&n, &s)
		if err == pgx.ErrDeadConn {
		} else if pgErr, ok := err.(pgx.PgError); ok && pgErr.Severity == "FATAL" {
		} else {
			t.Fatalf("Expected QueryRow Scan to return fatal PgError or ErrDeadConn, but instead received %v", err)
		}
	}()

	otherConn, err := pgx.Connect(*defaultConnConfig)
	if err != nil {
		t.Fatalf("Unable to establish connection: %v", err)
	}
	defer otherConn.Close()

	if _, err := otherConn.Exec("select pg_terminate_backend($1)", conn.PID()); err != nil {
		t.Fatalf("Unable to kill backend PostgreSQL process: %v", err)
	}

	wg.Wait()

	if conn.IsAlive() {
		t.Fatal("Connection should not be live but was")
	}
}

func TestFatalTxError(t *testing.T) {
	t.Parallel()

	// Run timing sensitive test many times
	for i := 0; i < 50; i++ {
		func() {
			conn := mustConnect(t, *defaultConnConfig)
			defer closeConn(t, conn)

			otherConn, err := pgx.Connect(*defaultConnConfig)
			if err != nil {
				t.Fatalf("Unable to establish connection: %v", err)
			}
			defer otherConn.Close()

			_, err = otherConn.Exec("select pg_terminate_backend($1)", conn.PID())
			if err != nil {
				t.Fatalf("Unable to kill backend PostgreSQL process: %v", err)
			}

			_, err = conn.Query("select 1")
			if err == nil {
				t.Fatal("Expected error but none occurred")
			}

			if conn.IsAlive() {
				t.Fatalf("Connection should not be live but was. Previous Query err: %v", err)
			}
		}()
	}
}

func TestCommandTag(t *testing.T) {
	t.Parallel()

	var tests = []struct {
		commandTag   pgx.CommandTag
		rowsAffected int64
	}{
		{commandTag: "INSERT 0 5", rowsAffected: 5},
		{commandTag: "UPDATE 0", rowsAffected: 0},
		{commandTag: "UPDATE 1", rowsAffected: 1},
		{commandTag: "DELETE 0", rowsAffected: 0},
		{commandTag: "DELETE 1", rowsAffected: 1},
		{commandTag: "CREATE TABLE", rowsAffected: 0},
		{commandTag: "ALTER TABLE", rowsAffected: 0},
		{commandTag: "DROP TABLE", rowsAffected: 0},
	}

	for i, tt := range tests {
		actual := tt.commandTag.RowsAffected()
		if tt.rowsAffected != actual {
			t.Errorf(`%d. "%s" should have affected %d rows but it was %d`, i, tt.commandTag, tt.rowsAffected, actual)
		}
	}
}

func TestInsertBoolArray(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	if results := mustExec(t, conn, "create temporary table foo(spice bool[]);"); results != "CREATE TABLE" {
		t.Error("Unexpected results from Exec")
	}

	// Accept parameters
	if results := mustExec(t, conn, "insert into foo(spice) values($1)", []bool{true, false, true}); results != "INSERT 0 1" {
		t.Errorf("Unexpected results from Exec: %v", results)
	}
}

func TestInsertTimestampArray(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	if results := mustExec(t, conn, "create temporary table foo(spice timestamp[]);"); results != "CREATE TABLE" {
		t.Error("Unexpected results from Exec")
	}

	// Accept parameters
	if results := mustExec(t, conn, "insert into foo(spice) values($1)", []time.Time{time.Unix(1419143667, 0), time.Unix(1419143672, 0)}); results != "INSERT 0 1" {
		t.Errorf("Unexpected results from Exec: %v", results)
	}
}

func TestCatchSimultaneousConnectionQueries(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	rows1, err := conn.Query("select generate_series(1,$1)", 10)
	if err != nil {
		t.Fatalf("conn.Query failed: %v", err)
	}
	defer rows1.Close()

	_, err = conn.Query("select generate_series(1,$1)", 10)
	if err != pgx.ErrConnBusy {
		t.Fatalf("conn.Query should have failed with pgx.ErrConnBusy, but it was %v", err)
	}
}

func TestCatchSimultaneousConnectionQueryAndExec(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	rows, err := conn.Query("select generate_series(1,$1)", 10)
	if err != nil {
		t.Fatalf("conn.Query failed: %v", err)
	}
	defer rows.Close()

	_, err = conn.Exec("create temporary table foo(spice timestamp[])")
	if err != pgx.ErrConnBusy {
		t.Fatalf("conn.Exec should have failed with pgx.ErrConnBusy, but it was %v", err)
	}
}

type testLog struct {
	lvl int
	msg string
	ctx []interface{}
}

type testLogger struct {
	logs []testLog
}

func (l *testLogger) Log(level int, msg string, ctx ...interface{}) {
	l.logs = append(l.logs, testLog{lvl: level, msg: msg, ctx: ctx})
}

func TestSetLogger(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	l1 := &testLogger{}
	oldLogger := conn.SetLogger(l1)
	if oldLogger != nil {
		t.Fatalf("Expected conn.SetLogger to return %v, but it was %v", nil, oldLogger)
	}

	if err := conn.Listen("foo"); err != nil {
		t.Fatal(err)
	}

	if len(l1.logs) == 0 {
		t.Fatal("Expected new logger l1 to be called, but it wasn't")
	}

	l2 := &testLogger{}
	oldLogger = conn.SetLogger(l2)
	if oldLogger != l1 {
		t.Fatalf("Expected conn.SetLogger to return %v, but it was %v", l1, oldLogger)
	}

	if err := conn.Listen("bar"); err != nil {
		t.Fatal(err)
	}

	if len(l2.logs) == 0 {
		t.Fatal("Expected new logger l2 to be called, but it wasn't")
	}
}

func TestSetLogLevel(t *testing.T) {
	t.Parallel()

	conn := mustConnect(t, *defaultConnConfig)
	defer closeConn(t, conn)

	logger := &testLogger{}
	conn.SetLogger(logger)

	if _, err := conn.SetLogLevel(0); err != pgx.ErrInvalidLogLevel {
		t.Fatal("SetLogLevel with invalid level did not return error")
	}

	if _, err := conn.SetLogLevel(pgx.LogLevelNone); err != nil {
		t.Fatal(err)
	}

	if err := conn.Listen("foo"); err != nil {
		t.Fatal(err)
	}

	if len(logger.logs) != 0 {
		t.Fatalf("Expected logger not to be called, but it was: %v", logger.logs)
	}

	if _, err := conn.SetLogLevel(pgx.LogLevelTrace); err != nil {
		t.Fatal(err)
	}

	if err := conn.Listen("bar"); err != nil {
		t.Fatal(err)
	}

	if len(logger.logs) == 0 {
		t.Fatal("Expected logger to be called, but it wasn't")
	}
}