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package pgconn
import (
"context"
"errors"
"fmt"
"net"
"net/url"
"regexp"
"strings"
)
// SafeToRetry checks if the err is guaranteed to have occurred before sending any data to the server.
func SafeToRetry(err error) bool {
var retryableErr interface{ SafeToRetry() bool }
if errors.As(err, &retryableErr) {
return retryableErr.SafeToRetry()
}
return false
}
// Timeout checks if err was caused by a timeout. To be specific, it is true if err was caused within pgconn by a
// context.DeadlineExceeded or an implementer of net.Error where Timeout() is true.
func Timeout(err error) bool {
var timeoutErr *errTimeout
return errors.As(err, &timeoutErr)
}
// PgError represents an error reported by the PostgreSQL server. See
// http://www.postgresql.org/docs/11/static/protocol-error-fields.html for
// detailed field description.
type PgError struct {
Severity string
SeverityUnlocalized string
Code string
Message string
Detail string
Hint string
Position int32
InternalPosition int32
InternalQuery string
Where string
SchemaName string
TableName string
ColumnName string
DataTypeName string
ConstraintName string
File string
Line int32
Routine string
}
func (pe *PgError) Error() string {
return pe.Severity + ": " + pe.Message + " (SQLSTATE " + pe.Code + ")"
}
// SQLState returns the SQLState of the error.
func (pe *PgError) SQLState() string {
return pe.Code
}
// ConnectError is the error returned when a connection attempt fails.
type ConnectError struct {
Config *Config // The configuration that was used in the connection attempt.
err error
}
func (e *ConnectError) Error() string {
prefix := fmt.Sprintf("failed to connect to `user=%s database=%s`:", e.Config.User, e.Config.Database)
details := e.err.Error()
if strings.Contains(details, "\n") {
return prefix + "\n\t" + strings.ReplaceAll(details, "\n", "\n\t")
} else {
return prefix + " " + details
}
}
func (e *ConnectError) Unwrap() error {
return e.err
}
type perDialConnectError struct {
address string
originalHostname string
err error
}
func (e *perDialConnectError) Error() string {
return fmt.Sprintf("%s (%s): %s", e.address, e.originalHostname, e.err.Error())
}
func (e *perDialConnectError) Unwrap() error {
return e.err
}
type connLockError struct {
status string
}
func (e *connLockError) SafeToRetry() bool {
return true // a lock failure by definition happens before the connection is used.
}
func (e *connLockError) Error() string {
return e.status
}
// ParseConfigError is the error returned when a connection string cannot be parsed.
type ParseConfigError struct {
ConnString string // The connection string that could not be parsed.
msg string
err error
}
func (e *ParseConfigError) Error() string {
// Now that ParseConfigError is public and ConnString is available to the developer, perhaps it would be better only
// return a static string. That would ensure that the error message cannot leak a password. The ConnString field would
// allow access to the original string if desired and Unwrap would allow access to the underlying error.
connString := redactPW(e.ConnString)
if e.err == nil {
return fmt.Sprintf("cannot parse `%s`: %s", connString, e.msg)
}
return fmt.Sprintf("cannot parse `%s`: %s (%s)", connString, e.msg, e.err.Error())
}
func (e *ParseConfigError) Unwrap() error {
return e.err
}
func normalizeTimeoutError(ctx context.Context, err error) error {
var netErr net.Error
if errors.As(err, &netErr) && netErr.Timeout() {
if ctx.Err() == context.Canceled {
// Since the timeout was caused by a context cancellation, the actual error is context.Canceled not the timeout error.
return context.Canceled
} else if ctx.Err() == context.DeadlineExceeded {
return &errTimeout{err: ctx.Err()}
} else {
return &errTimeout{err: netErr}
}
}
return err
}
type pgconnError struct {
msg string
err error
safeToRetry bool
}
func (e *pgconnError) Error() string {
if e.msg == "" {
return e.err.Error()
}
if e.err == nil {
return e.msg
}
return fmt.Sprintf("%s: %s", e.msg, e.err.Error())
}
func (e *pgconnError) SafeToRetry() bool {
return e.safeToRetry
}
func (e *pgconnError) Unwrap() error {
return e.err
}
// errTimeout occurs when an error was caused by a timeout. Specifically, it wraps an error which is
// context.Canceled, context.DeadlineExceeded, or an implementer of net.Error where Timeout() is true.
type errTimeout struct {
err error
}
func (e *errTimeout) Error() string {
return fmt.Sprintf("timeout: %s", e.err.Error())
}
func (e *errTimeout) SafeToRetry() bool {
return SafeToRetry(e.err)
}
func (e *errTimeout) Unwrap() error {
return e.err
}
type contextAlreadyDoneError struct {
err error
}
func (e *contextAlreadyDoneError) Error() string {
return fmt.Sprintf("context already done: %s", e.err.Error())
}
func (e *contextAlreadyDoneError) SafeToRetry() bool {
return true
}
func (e *contextAlreadyDoneError) Unwrap() error {
return e.err
}
// newContextAlreadyDoneError double-wraps a context error in `contextAlreadyDoneError` and `errTimeout`.
func newContextAlreadyDoneError(ctx context.Context) (err error) {
return &errTimeout{&contextAlreadyDoneError{err: ctx.Err()}}
}
func redactPW(connString string) string {
if strings.HasPrefix(connString, "postgres://") || strings.HasPrefix(connString, "postgresql://") {
if u, err := url.Parse(connString); err == nil {
return redactURL(u)
}
}
quotedKV := regexp.MustCompile(`password='[^']*'`)
connString = quotedKV.ReplaceAllLiteralString(connString, "password=xxxxx")
plainKV := regexp.MustCompile(`password=[^ ]*`)
connString = plainKV.ReplaceAllLiteralString(connString, "password=xxxxx")
brokenURL := regexp.MustCompile(`:[^:@]+?@`)
connString = brokenURL.ReplaceAllLiteralString(connString, ":xxxxxx@")
return connString
}
func redactURL(u *url.URL) string {
if u == nil {
return ""
}
if _, pwSet := u.User.Password(); pwSet {
u.User = url.UserPassword(u.User.Username(), "xxxxx")
}
return u.String()
}
type NotPreferredError struct {
err error
safeToRetry bool
}
func (e *NotPreferredError) Error() string {
return fmt.Sprintf("standby server not found: %s", e.err.Error())
}
func (e *NotPreferredError) SafeToRetry() bool {
return e.safeToRetry
}
func (e *NotPreferredError) Unwrap() error {
return e.err
}
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