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726 lines
18 KiB
726 lines
18 KiB
// Go MySQL Driver - A MySQL-Driver for Go's database/sql package |
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// |
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// Copyright 2012 The Go-MySQL-Driver Authors. All rights reserved. |
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// |
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// This Source Code Form is subject to the terms of the Mozilla Public |
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// License, v. 2.0. If a copy of the MPL was not distributed with this file, |
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// You can obtain one at http://mozilla.org/MPL/2.0/. |
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package mysql |
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import ( |
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"crypto/tls" |
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"database/sql/driver" |
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"encoding/binary" |
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"fmt" |
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"io" |
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"strconv" |
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"strings" |
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"sync" |
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"sync/atomic" |
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"time" |
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) |
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// Registry for custom tls.Configs |
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var ( |
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tlsConfigLock sync.RWMutex |
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tlsConfigRegistry map[string]*tls.Config |
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) |
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// RegisterTLSConfig registers a custom tls.Config to be used with sql.Open. |
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// Use the key as a value in the DSN where tls=value. |
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// |
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// Note: The provided tls.Config is exclusively owned by the driver after |
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// registering it. |
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// |
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// rootCertPool := x509.NewCertPool() |
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// pem, err := ioutil.ReadFile("/path/ca-cert.pem") |
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// if err != nil { |
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// log.Fatal(err) |
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// } |
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// if ok := rootCertPool.AppendCertsFromPEM(pem); !ok { |
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// log.Fatal("Failed to append PEM.") |
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// } |
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// clientCert := make([]tls.Certificate, 0, 1) |
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// certs, err := tls.LoadX509KeyPair("/path/client-cert.pem", "/path/client-key.pem") |
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// if err != nil { |
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// log.Fatal(err) |
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// } |
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// clientCert = append(clientCert, certs) |
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// mysql.RegisterTLSConfig("custom", &tls.Config{ |
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// RootCAs: rootCertPool, |
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// Certificates: clientCert, |
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// }) |
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// db, err := sql.Open("mysql", "user@tcp(localhost:3306)/test?tls=custom") |
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// |
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func RegisterTLSConfig(key string, config *tls.Config) error { |
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if _, isBool := readBool(key); isBool || strings.ToLower(key) == "skip-verify" { |
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return fmt.Errorf("key '%s' is reserved", key) |
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} |
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tlsConfigLock.Lock() |
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if tlsConfigRegistry == nil { |
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tlsConfigRegistry = make(map[string]*tls.Config) |
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} |
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tlsConfigRegistry[key] = config |
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tlsConfigLock.Unlock() |
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return nil |
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} |
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// DeregisterTLSConfig removes the tls.Config associated with key. |
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func DeregisterTLSConfig(key string) { |
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tlsConfigLock.Lock() |
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if tlsConfigRegistry != nil { |
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delete(tlsConfigRegistry, key) |
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} |
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tlsConfigLock.Unlock() |
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} |
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func getTLSConfigClone(key string) (config *tls.Config) { |
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tlsConfigLock.RLock() |
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if v, ok := tlsConfigRegistry[key]; ok { |
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config = cloneTLSConfig(v) |
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} |
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tlsConfigLock.RUnlock() |
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return |
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} |
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// Returns the bool value of the input. |
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// The 2nd return value indicates if the input was a valid bool value |
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func readBool(input string) (value bool, valid bool) { |
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switch input { |
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case "1", "true", "TRUE", "True": |
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return true, true |
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case "0", "false", "FALSE", "False": |
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return false, true |
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} |
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// Not a valid bool value |
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return |
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} |
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/****************************************************************************** |
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* Time related utils * |
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******************************************************************************/ |
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// NullTime represents a time.Time that may be NULL. |
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// NullTime implements the Scanner interface so |
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// it can be used as a scan destination: |
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// |
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// var nt NullTime |
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// err := db.QueryRow("SELECT time FROM foo WHERE id=?", id).Scan(&nt) |
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// ... |
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// if nt.Valid { |
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// // use nt.Time |
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// } else { |
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// // NULL value |
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// } |
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// |
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// This NullTime implementation is not driver-specific |
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type NullTime struct { |
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Time time.Time |
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Valid bool // Valid is true if Time is not NULL |
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} |
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// Scan implements the Scanner interface. |
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// The value type must be time.Time or string / []byte (formatted time-string), |
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// otherwise Scan fails. |
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func (nt *NullTime) Scan(value interface{}) (err error) { |
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if value == nil { |
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nt.Time, nt.Valid = time.Time{}, false |
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return |
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} |
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switch v := value.(type) { |
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case time.Time: |
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nt.Time, nt.Valid = v, true |
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return |
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case []byte: |
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nt.Time, err = parseDateTime(string(v), time.UTC) |
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nt.Valid = (err == nil) |
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return |
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case string: |
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nt.Time, err = parseDateTime(v, time.UTC) |
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nt.Valid = (err == nil) |
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return |
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} |
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nt.Valid = false |
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return fmt.Errorf("Can't convert %T to time.Time", value) |
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} |
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// Value implements the driver Valuer interface. |
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func (nt NullTime) Value() (driver.Value, error) { |
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if !nt.Valid { |
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return nil, nil |
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} |
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return nt.Time, nil |
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} |
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func parseDateTime(str string, loc *time.Location) (t time.Time, err error) { |
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base := "0000-00-00 00:00:00.0000000" |
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switch len(str) { |
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case 10, 19, 21, 22, 23, 24, 25, 26: // up to "YYYY-MM-DD HH:MM:SS.MMMMMM" |
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if str == base[:len(str)] { |
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return |
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} |
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t, err = time.Parse(timeFormat[:len(str)], str) |
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default: |
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err = fmt.Errorf("invalid time string: %s", str) |
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return |
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} |
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// Adjust location |
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if err == nil && loc != time.UTC { |
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y, mo, d := t.Date() |
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h, mi, s := t.Clock() |
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t, err = time.Date(y, mo, d, h, mi, s, t.Nanosecond(), loc), nil |
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} |
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return |
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} |
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func parseBinaryDateTime(num uint64, data []byte, loc *time.Location) (driver.Value, error) { |
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switch num { |
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case 0: |
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return time.Time{}, nil |
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case 4: |
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return time.Date( |
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int(binary.LittleEndian.Uint16(data[:2])), // year |
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time.Month(data[2]), // month |
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int(data[3]), // day |
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0, 0, 0, 0, |
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loc, |
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), nil |
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case 7: |
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return time.Date( |
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int(binary.LittleEndian.Uint16(data[:2])), // year |
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time.Month(data[2]), // month |
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int(data[3]), // day |
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int(data[4]), // hour |
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int(data[5]), // minutes |
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int(data[6]), // seconds |
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0, |
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loc, |
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), nil |
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case 11: |
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return time.Date( |
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int(binary.LittleEndian.Uint16(data[:2])), // year |
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time.Month(data[2]), // month |
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int(data[3]), // day |
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int(data[4]), // hour |
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int(data[5]), // minutes |
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int(data[6]), // seconds |
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int(binary.LittleEndian.Uint32(data[7:11]))*1000, // nanoseconds |
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loc, |
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), nil |
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} |
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return nil, fmt.Errorf("invalid DATETIME packet length %d", num) |
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} |
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// zeroDateTime is used in formatBinaryDateTime to avoid an allocation |
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// if the DATE or DATETIME has the zero value. |
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// It must never be changed. |
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// The current behavior depends on database/sql copying the result. |
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var zeroDateTime = []byte("0000-00-00 00:00:00.000000") |
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const digits01 = "0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789" |
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const digits10 = "0000000000111111111122222222223333333333444444444455555555556666666666777777777788888888889999999999" |
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func appendMicrosecs(dst, src []byte, decimals int) []byte { |
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if decimals <= 0 { |
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return dst |
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} |
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if len(src) == 0 { |
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return append(dst, ".000000"[:decimals+1]...) |
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} |
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microsecs := binary.LittleEndian.Uint32(src[:4]) |
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p1 := byte(microsecs / 10000) |
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microsecs -= 10000 * uint32(p1) |
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p2 := byte(microsecs / 100) |
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microsecs -= 100 * uint32(p2) |
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p3 := byte(microsecs) |
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switch decimals { |
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default: |
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return append(dst, '.', |
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digits10[p1], digits01[p1], |
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digits10[p2], digits01[p2], |
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digits10[p3], digits01[p3], |
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) |
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case 1: |
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return append(dst, '.', |
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digits10[p1], |
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) |
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case 2: |
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return append(dst, '.', |
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digits10[p1], digits01[p1], |
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) |
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case 3: |
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return append(dst, '.', |
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digits10[p1], digits01[p1], |
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digits10[p2], |
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) |
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case 4: |
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return append(dst, '.', |
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digits10[p1], digits01[p1], |
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digits10[p2], digits01[p2], |
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) |
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case 5: |
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return append(dst, '.', |
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digits10[p1], digits01[p1], |
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digits10[p2], digits01[p2], |
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digits10[p3], |
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) |
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} |
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} |
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func formatBinaryDateTime(src []byte, length uint8) (driver.Value, error) { |
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// length expects the deterministic length of the zero value, |
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// negative time and 100+ hours are automatically added if needed |
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if len(src) == 0 { |
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return zeroDateTime[:length], nil |
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} |
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var dst []byte // return value |
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var p1, p2, p3 byte // current digit pair |
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switch length { |
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case 10, 19, 21, 22, 23, 24, 25, 26: |
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default: |
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t := "DATE" |
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if length > 10 { |
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t += "TIME" |
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} |
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return nil, fmt.Errorf("illegal %s length %d", t, length) |
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} |
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switch len(src) { |
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case 4, 7, 11: |
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default: |
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t := "DATE" |
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if length > 10 { |
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t += "TIME" |
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} |
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return nil, fmt.Errorf("illegal %s packet length %d", t, len(src)) |
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} |
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dst = make([]byte, 0, length) |
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// start with the date |
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year := binary.LittleEndian.Uint16(src[:2]) |
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pt := year / 100 |
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p1 = byte(year - 100*uint16(pt)) |
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p2, p3 = src[2], src[3] |
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dst = append(dst, |
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digits10[pt], digits01[pt], |
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digits10[p1], digits01[p1], '-', |
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digits10[p2], digits01[p2], '-', |
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digits10[p3], digits01[p3], |
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) |
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if length == 10 { |
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return dst, nil |
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} |
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if len(src) == 4 { |
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return append(dst, zeroDateTime[10:length]...), nil |
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} |
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dst = append(dst, ' ') |
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p1 = src[4] // hour |
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src = src[5:] |
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// p1 is 2-digit hour, src is after hour |
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p2, p3 = src[0], src[1] |
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dst = append(dst, |
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digits10[p1], digits01[p1], ':', |
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digits10[p2], digits01[p2], ':', |
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digits10[p3], digits01[p3], |
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) |
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return appendMicrosecs(dst, src[2:], int(length)-20), nil |
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} |
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func formatBinaryTime(src []byte, length uint8) (driver.Value, error) { |
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// length expects the deterministic length of the zero value, |
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// negative time and 100+ hours are automatically added if needed |
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if len(src) == 0 { |
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return zeroDateTime[11 : 11+length], nil |
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} |
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var dst []byte // return value |
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switch length { |
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case |
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8, // time (can be up to 10 when negative and 100+ hours) |
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10, 11, 12, 13, 14, 15: // time with fractional seconds |
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default: |
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return nil, fmt.Errorf("illegal TIME length %d", length) |
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} |
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switch len(src) { |
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case 8, 12: |
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default: |
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return nil, fmt.Errorf("invalid TIME packet length %d", len(src)) |
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} |
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// +2 to enable negative time and 100+ hours |
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dst = make([]byte, 0, length+2) |
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if src[0] == 1 { |
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dst = append(dst, '-') |
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} |
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days := binary.LittleEndian.Uint32(src[1:5]) |
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hours := int64(days)*24 + int64(src[5]) |
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if hours >= 100 { |
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dst = strconv.AppendInt(dst, hours, 10) |
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} else { |
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dst = append(dst, digits10[hours], digits01[hours]) |
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} |
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min, sec := src[6], src[7] |
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dst = append(dst, ':', |
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digits10[min], digits01[min], ':', |
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digits10[sec], digits01[sec], |
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) |
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return appendMicrosecs(dst, src[8:], int(length)-9), nil |
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} |
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/****************************************************************************** |
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* Convert from and to bytes * |
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******************************************************************************/ |
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func uint64ToBytes(n uint64) []byte { |
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return []byte{ |
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byte(n), |
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byte(n >> 8), |
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byte(n >> 16), |
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byte(n >> 24), |
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byte(n >> 32), |
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byte(n >> 40), |
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byte(n >> 48), |
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byte(n >> 56), |
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} |
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} |
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func uint64ToString(n uint64) []byte { |
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var a [20]byte |
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i := 20 |
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// U+0030 = 0 |
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// ... |
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// U+0039 = 9 |
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var q uint64 |
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for n >= 10 { |
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i-- |
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q = n / 10 |
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a[i] = uint8(n-q*10) + 0x30 |
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n = q |
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} |
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i-- |
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a[i] = uint8(n) + 0x30 |
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return a[i:] |
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} |
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// treats string value as unsigned integer representation |
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func stringToInt(b []byte) int { |
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val := 0 |
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for i := range b { |
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val *= 10 |
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val += int(b[i] - 0x30) |
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} |
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return val |
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} |
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// returns the string read as a bytes slice, wheter the value is NULL, |
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// the number of bytes read and an error, in case the string is longer than |
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// the input slice |
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func readLengthEncodedString(b []byte) ([]byte, bool, int, error) { |
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// Get length |
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num, isNull, n := readLengthEncodedInteger(b) |
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if num < 1 { |
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return b[n:n], isNull, n, nil |
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} |
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n += int(num) |
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// Check data length |
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if len(b) >= n { |
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return b[n-int(num) : n : n], false, n, nil |
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} |
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return nil, false, n, io.EOF |
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} |
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// returns the number of bytes skipped and an error, in case the string is |
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// longer than the input slice |
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func skipLengthEncodedString(b []byte) (int, error) { |
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// Get length |
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num, _, n := readLengthEncodedInteger(b) |
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if num < 1 { |
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return n, nil |
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} |
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n += int(num) |
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// Check data length |
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if len(b) >= n { |
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return n, nil |
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} |
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return n, io.EOF |
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} |
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// returns the number read, whether the value is NULL and the number of bytes read |
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func readLengthEncodedInteger(b []byte) (uint64, bool, int) { |
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// See issue #349 |
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if len(b) == 0 { |
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return 0, true, 1 |
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} |
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|
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switch b[0] { |
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// 251: NULL |
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case 0xfb: |
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return 0, true, 1 |
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// 252: value of following 2 |
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case 0xfc: |
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return uint64(b[1]) | uint64(b[2])<<8, false, 3 |
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// 253: value of following 3 |
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case 0xfd: |
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return uint64(b[1]) | uint64(b[2])<<8 | uint64(b[3])<<16, false, 4 |
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|
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// 254: value of following 8 |
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case 0xfe: |
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return uint64(b[1]) | uint64(b[2])<<8 | uint64(b[3])<<16 | |
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uint64(b[4])<<24 | uint64(b[5])<<32 | uint64(b[6])<<40 | |
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uint64(b[7])<<48 | uint64(b[8])<<56, |
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false, 9 |
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} |
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|
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// 0-250: value of first byte |
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return uint64(b[0]), false, 1 |
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} |
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// encodes a uint64 value and appends it to the given bytes slice |
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func appendLengthEncodedInteger(b []byte, n uint64) []byte { |
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switch { |
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case n <= 250: |
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return append(b, byte(n)) |
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|
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case n <= 0xffff: |
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return append(b, 0xfc, byte(n), byte(n>>8)) |
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|
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case n <= 0xffffff: |
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return append(b, 0xfd, byte(n), byte(n>>8), byte(n>>16)) |
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} |
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return append(b, 0xfe, byte(n), byte(n>>8), byte(n>>16), byte(n>>24), |
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byte(n>>32), byte(n>>40), byte(n>>48), byte(n>>56)) |
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} |
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|
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// reserveBuffer checks cap(buf) and expand buffer to len(buf) + appendSize. |
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// If cap(buf) is not enough, reallocate new buffer. |
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func reserveBuffer(buf []byte, appendSize int) []byte { |
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newSize := len(buf) + appendSize |
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if cap(buf) < newSize { |
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// Grow buffer exponentially |
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newBuf := make([]byte, len(buf)*2+appendSize) |
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copy(newBuf, buf) |
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buf = newBuf |
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} |
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return buf[:newSize] |
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} |
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|
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// escapeBytesBackslash escapes []byte with backslashes (\) |
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// This escapes the contents of a string (provided as []byte) by adding backslashes before special |
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// characters, and turning others into specific escape sequences, such as |
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// turning newlines into \n and null bytes into \0. |
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// https://github.com/mysql/mysql-server/blob/mysql-5.7.5/mysys/charset.c#L823-L932 |
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func escapeBytesBackslash(buf, v []byte) []byte { |
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pos := len(buf) |
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buf = reserveBuffer(buf, len(v)*2) |
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|
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for _, c := range v { |
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switch c { |
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case '\x00': |
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buf[pos] = '\\' |
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buf[pos+1] = '0' |
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pos += 2 |
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case '\n': |
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buf[pos] = '\\' |
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buf[pos+1] = 'n' |
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pos += 2 |
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case '\r': |
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buf[pos] = '\\' |
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buf[pos+1] = 'r' |
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pos += 2 |
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case '\x1a': |
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buf[pos] = '\\' |
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buf[pos+1] = 'Z' |
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pos += 2 |
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case '\'': |
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buf[pos] = '\\' |
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buf[pos+1] = '\'' |
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pos += 2 |
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case '"': |
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buf[pos] = '\\' |
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buf[pos+1] = '"' |
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pos += 2 |
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case '\\': |
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buf[pos] = '\\' |
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buf[pos+1] = '\\' |
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pos += 2 |
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default: |
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buf[pos] = c |
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pos++ |
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} |
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} |
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|
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return buf[:pos] |
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} |
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|
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// escapeStringBackslash is similar to escapeBytesBackslash but for string. |
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func escapeStringBackslash(buf []byte, v string) []byte { |
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pos := len(buf) |
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buf = reserveBuffer(buf, len(v)*2) |
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|
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for i := 0; i < len(v); i++ { |
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c := v[i] |
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switch c { |
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case '\x00': |
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buf[pos] = '\\' |
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buf[pos+1] = '0' |
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pos += 2 |
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case '\n': |
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buf[pos] = '\\' |
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buf[pos+1] = 'n' |
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pos += 2 |
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case '\r': |
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buf[pos] = '\\' |
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buf[pos+1] = 'r' |
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pos += 2 |
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case '\x1a': |
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buf[pos] = '\\' |
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buf[pos+1] = 'Z' |
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pos += 2 |
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case '\'': |
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buf[pos] = '\\' |
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buf[pos+1] = '\'' |
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pos += 2 |
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case '"': |
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buf[pos] = '\\' |
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buf[pos+1] = '"' |
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pos += 2 |
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case '\\': |
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buf[pos] = '\\' |
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buf[pos+1] = '\\' |
|
pos += 2 |
|
default: |
|
buf[pos] = c |
|
pos++ |
|
} |
|
} |
|
|
|
return buf[:pos] |
|
} |
|
|
|
// escapeBytesQuotes escapes apostrophes in []byte by doubling them up. |
|
// This escapes the contents of a string by doubling up any apostrophes that |
|
// it contains. This is used when the NO_BACKSLASH_ESCAPES SQL_MODE is in |
|
// effect on the server. |
|
// https://github.com/mysql/mysql-server/blob/mysql-5.7.5/mysys/charset.c#L963-L1038 |
|
func escapeBytesQuotes(buf, v []byte) []byte { |
|
pos := len(buf) |
|
buf = reserveBuffer(buf, len(v)*2) |
|
|
|
for _, c := range v { |
|
if c == '\'' { |
|
buf[pos] = '\'' |
|
buf[pos+1] = '\'' |
|
pos += 2 |
|
} else { |
|
buf[pos] = c |
|
pos++ |
|
} |
|
} |
|
|
|
return buf[:pos] |
|
} |
|
|
|
// escapeStringQuotes is similar to escapeBytesQuotes but for string. |
|
func escapeStringQuotes(buf []byte, v string) []byte { |
|
pos := len(buf) |
|
buf = reserveBuffer(buf, len(v)*2) |
|
|
|
for i := 0; i < len(v); i++ { |
|
c := v[i] |
|
if c == '\'' { |
|
buf[pos] = '\'' |
|
buf[pos+1] = '\'' |
|
pos += 2 |
|
} else { |
|
buf[pos] = c |
|
pos++ |
|
} |
|
} |
|
|
|
return buf[:pos] |
|
} |
|
|
|
/****************************************************************************** |
|
* Sync utils * |
|
******************************************************************************/ |
|
|
|
// noCopy may be embedded into structs which must not be copied |
|
// after the first use. |
|
// |
|
// See https://github.com/golang/go/issues/8005#issuecomment-190753527 |
|
// for details. |
|
type noCopy struct{} |
|
|
|
// Lock is a no-op used by -copylocks checker from `go vet`. |
|
func (*noCopy) Lock() {} |
|
|
|
// atomicBool is a wrapper around uint32 for usage as a boolean value with |
|
// atomic access. |
|
type atomicBool struct { |
|
_noCopy noCopy |
|
value uint32 |
|
} |
|
|
|
// IsSet returns wether the current boolean value is true |
|
func (ab *atomicBool) IsSet() bool { |
|
return atomic.LoadUint32(&ab.value) > 0 |
|
} |
|
|
|
// Set sets the value of the bool regardless of the previous value |
|
func (ab *atomicBool) Set(value bool) { |
|
if value { |
|
atomic.StoreUint32(&ab.value, 1) |
|
} else { |
|
atomic.StoreUint32(&ab.value, 0) |
|
} |
|
} |
|
|
|
// TrySet sets the value of the bool and returns wether the value changed |
|
func (ab *atomicBool) TrySet(value bool) bool { |
|
if value { |
|
return atomic.SwapUint32(&ab.value, 1) == 0 |
|
} |
|
return atomic.SwapUint32(&ab.value, 0) > 0 |
|
} |
|
|
|
// atomicError is a wrapper for atomically accessed error values |
|
type atomicError struct { |
|
_noCopy noCopy |
|
value atomic.Value |
|
} |
|
|
|
// Set sets the error value regardless of the previous value. |
|
// The value must not be nil |
|
func (ae *atomicError) Set(value error) { |
|
ae.value.Store(value) |
|
} |
|
|
|
// Value returns the current error value |
|
func (ae *atomicError) Value() error { |
|
if v := ae.value.Load(); v != nil { |
|
// this will panic if the value doesn't implement the error interface |
|
return v.(error) |
|
} |
|
return nil |
|
}
|
|
|