/
connection.go
207 lines (186 loc) · 5.16 KB
/
connection.go
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// Tideland Go Library - Redis Client - Connection
//
// Copyright (C) 2009-2017 Frank Mueller / Oldenburg / Germany
//
// All rights reserved. Use of this source code is governed
// by the new BSD license.
package redis
//--------------------
// IMPORTS
//--------------------
import (
"strings"
"github.com/tideland/golib/errors"
"github.com/tideland/golib/identifier"
"github.com/tideland/golib/monitoring"
)
//--------------------
// CONNECTION
//--------------------
// Connection manages one connection to a Redis database.
type Connection struct {
database *Database
resp *resp
}
// newConnection creates a new connection instance.
func newConnection(db *Database) (*Connection, error) {
conn := &Connection{
database: db,
}
err := conn.ensureProtocol()
if err != nil {
return nil, err
}
// Perform authentication and database selection.
err = conn.resp.authenticate()
if err != nil {
conn.database.pool.kill(conn.resp)
return nil, err
}
err = conn.resp.selectDatabase()
if err != nil {
conn.database.pool.kill(conn.resp)
return nil, err
}
return conn, nil
}
// Do executes one Redis command and returns
// the result as result set.
func (conn *Connection) Do(cmd string, args ...interface{}) (*ResultSet, error) {
cmd = strings.ToLower(cmd)
if strings.Contains(cmd, "subscribe") {
return nil, errors.New(ErrUseSubscription, errorMessages)
}
err := conn.ensureProtocol()
if err != nil {
return nil, err
}
if conn.database.monitoring {
m := monitoring.BeginMeasuring(identifier.Identifier("redis", "command", cmd))
defer m.EndMeasuring()
}
err = conn.resp.sendCommand(cmd, args...)
logCommand(cmd, args, err, conn.database.logging)
if err != nil {
return nil, err
}
result, err := conn.resp.receiveResultSet()
return result, err
}
// DoValue executes one Redis command and returns a single value.
func (conn *Connection) DoValue(cmd string, args ...interface{}) (Value, error) {
result, err := conn.Do(cmd, args...)
if err != nil {
return nil, err
}
return result.ValueAt(0)
}
// DoOK executes one Redis command and checks if
// it returns the OK string.
func (conn *Connection) DoOK(cmd string, args ...interface{}) (bool, error) {
value, err := conn.DoValue(cmd, args...)
if err != nil {
return false, err
}
return value.IsOK(), nil
}
// DoBool executes one Redis command and interpretes
// the result as bool value.
func (conn *Connection) DoBool(cmd string, args ...interface{}) (bool, error) {
result, err := conn.Do(cmd, args...)
if err != nil {
return false, err
}
return result.BoolAt(0)
}
// DoInt executes one Redis command and interpretes
// the result as int value.
func (conn *Connection) DoInt(cmd string, args ...interface{}) (int, error) {
result, err := conn.Do(cmd, args...)
if err != nil {
return 0, err
}
return result.IntAt(0)
}
// DoString executes one Redis command and interpretes
// the result as string value.
func (conn *Connection) DoString(cmd string, args ...interface{}) (string, error) {
result, err := conn.Do(cmd, args...)
if err != nil {
return "", err
}
return result.StringAt(0)
}
// DoStrings executes one Redis command and interpretes
// the result as a slice of strings.
func (conn *Connection) DoStrings(cmd string, args ...interface{}) ([]string, error) {
result, err := conn.Do(cmd, args...)
if err != nil {
return nil, err
}
return result.Strings(), nil
}
// DoKeyValues executes on Redis command and interpretes
// the result as a list of keys and values.
func (conn *Connection) DoKeyValues(cmd string, args ...interface{}) (KeyValues, error) {
result, err := conn.Do(cmd, args...)
if err != nil {
return nil, err
}
return result.KeyValues()
}
// DoHash executes on Redis command and interpretes
// the result as a hash.
func (conn *Connection) DoHash(cmd string, args ...interface{}) (Hash, error) {
result, err := conn.Do(cmd, args...)
if err != nil {
return nil, err
}
return result.Hash()
}
// DoScoredValues executes on Redis command and interpretes
// the result as scored values.
func (conn *Connection) DoScoredValues(cmd string, args ...interface{}) (ScoredValues, error) {
var withScores bool
for _, arg := range args {
if s, ok := arg.(string); ok {
if strings.ToLower(s) == "withscores" {
withScores = true
break
}
}
}
result, err := conn.Do(cmd, args...)
if err != nil {
return nil, err
}
return result.ScoredValues(withScores)
}
// DoScan executes one Redis command which should be one of the
// scan commands. It returns the cursor and the result set containing
// the key, values or scored values depending on the scan command.
func (conn *Connection) DoScan(cmd string, args ...interface{}) (int, *ResultSet, error) {
result, err := conn.Do(cmd, args...)
if err != nil {
return 0, nil, err
}
return result.Scanned()
}
// Return passes the connection back into the database pool.
func (conn *Connection) Return() error {
err := conn.database.pool.push(conn.resp)
conn.resp = nil
return err
}
// ensureProtocol retrieves a protocol from the pool if needed.
func (conn *Connection) ensureProtocol() error {
if conn.resp == nil {
p, err := conn.database.pool.pull(unforcedPull)
if err != nil {
return err
}
conn.resp = p
}
return nil
}
// EOF