/
srv.go
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/
srv.go
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// Copyright 2017 Rana Ian. All rights reserved.
// Use of this source code is governed by The MIT License
// found in the accompanying LICENSE file.
package ora
/*
#include <oci.h>
#include <stdlib.h>
*/
import "C"
import (
"container/list"
"fmt"
"sync"
"sync/atomic"
"unsafe"
)
// SrvCfg configures a new Srv.
type SrvCfg struct {
// Dblink specifies an Oracle database server. Dblink is a connect string
// or a service point.
Dblink string
Pool PoolCfg
// StmtCfg configures new Stmts.
StmtCfg
}
func (c SrvCfg) IsZero() bool { return c.StmtCfg.IsZero() }
// LogSrvCfg represents Srv logging configuration values.
type LogSrvCfg struct {
// Close determines whether the Srv.Close method is logged.
//
// The default is true.
Close bool
// OpenSes determines whether the Srv.OpenSes method is logged.
//
// The default is true.
OpenSes bool
// Version determines whether the Srv.Version method is logged.
//
// The default is true.
Version bool
}
// NewLogSrvCfg creates a LogSrvCfg with default values.
func NewLogSrvCfg() LogSrvCfg {
c := LogSrvCfg{}
c.Close = true
c.OpenSes = true
c.Version = true
return c
}
// Srv represents an Oracle server.
type Srv struct {
sync.RWMutex
id uint64
cmu sync.Mutex
cfg atomic.Value
env *Env
ocisrv *C.OCIServer
isUTF8 int32
ocipool unsafe.Pointer
ociPoolName *C.OraText
ociPoolNameLen C.ub4
poolType PoolType
openSess *sesList
sysNamer
}
// Cfg returns the Srv's SrvCfg, or it's Env's, if not set.
// If the env is the PkgSqlEnv, that will override StmtCfg!
func (srv *Srv) Cfg() SrvCfg {
c := srv.cfg.Load()
var cfg SrvCfg
if c != nil {
cfg = c.(SrvCfg)
}
env := srv.env
if cfg.StmtCfg.IsZero() || env.isPkgEnv {
cfg.StmtCfg = env.Cfg()
}
return cfg
}
func (srv *Srv) SetCfg(cfg SrvCfg) {
srv.cfg.Store(cfg)
}
// Close disconnects from an Oracle server.
//
// Any open sessions associated with the server are closed.
//
// Calling Close will cause Srv.IsOpen to return false. Once closed, a server cannot
// be re-opened. Call Env.OpenSrv to open a new server.
func (srv *Srv) Close() (err error) {
if srv == nil {
return nil
}
return srv.closeWithRemove()
}
func (srv *Srv) closeWithRemove() error {
if srv == nil {
return nil
}
srv.RLock()
env := srv.env
srv.RUnlock()
if env == nil {
return nil
}
env.openSrvs.remove(srv)
return srv.close()
}
// close disconnects from an Oracle server.
// Does not remove Srv from Ses.openSrvs
func (srv *Srv) close() (err error) {
srv.log(_drv.Cfg().Log.Srv.Close)
err = srv.checkClosed()
if err != nil {
return errE(err)
}
srv.cmu.Lock()
defer srv.cmu.Unlock()
srv.RLock()
openSess := srv.openSess
srv.RUnlock()
errs := _drv.listPool.Get().(*list.List)
defer func() {
if value := recover(); value != nil {
errs.PushBack(errR(value))
}
srv.SetCfg(SrvCfg{})
openSess.clear()
srv.Lock()
srv.env = nil
srv.ocisrv = nil
srv.ocipool = nil
srv.ociPoolName = nil
srv.ociPoolNameLen = 0
srv.poolType = NoPool
srv.Unlock()
_drv.srvPool.Put(srv)
multiErr := newMultiErrL(errs)
if multiErr != nil {
err = errE(*multiErr)
}
errs.Init()
_drv.listPool.Put(errs)
}()
openSess.closeAll(errs) // close sessions
// detach server
srv.RLock()
env := srv.env
var r C.sword
switch srv.poolType {
case CPool:
r = C.OCIConnectionPoolDestroy(
(*C.OCICPool)(srv.ocipool), //OCICPool *poolhp,
env.ocierr, //OCIError *errhp,
C.OCI_DEFAULT, //ub4 mode );
)
case SPool, DRCPool:
r = C.OCISessionPoolDestroy(
(*C.OCISPool)(srv.ocipool), //OCISPool *spoolhp,
env.ocierr, //OCIError *errhp,
C.OCI_DEFAULT, //ub4 mode );
)
default:
r = C.OCIServerDetach(
srv.ocisrv, //OCIServer *srvhp,
env.ocierr, //OCIError *errhp,
C.OCI_DEFAULT, //ub4 mode );
)
}
ocisrv := srv.ocisrv
srv.RUnlock()
if r == C.OCI_ERROR {
errs.PushBack(errE(env.ociError()))
}
env.RLock()
err = srv.env.freeOciHandle(unsafe.Pointer(ocisrv), C.OCI_HTYPE_SERVER)
env.RUnlock()
if err != nil {
return errE(err)
}
return nil
}
// OpenSes opens an Oracle session returning a *Ses and possible error.
func (srv *Srv) OpenSes(cfg SesCfg) (ses *Ses, err error) {
if cfg.IsZero() {
return nil, er("Parameter 'cfg' may not be nil.")
}
defer func() {
if value := recover(); value != nil {
err = errR(value)
}
}()
if srv == nil {
return nil, er("srv may not be nil.")
}
srv.log(_drv.Cfg().Log.Srv.OpenSes)
credentialType := C.ub4(C.OCI_CRED_EXT)
var ocises, authInfo unsafe.Pointer
poolType := NoPool
if (srv.poolType == CPool && cfg.Mode != SysDba && cfg.Mode != SysOper) ||
((srv.poolType == DRCPool || srv.poolType == SPool) && cfg.Mode != SysOper) {
poolType = srv.poolType
if authInfo, err = srv.env.allocOciHandle(C.OCI_HTYPE_AUTHINFO); err != nil {
return nil, errE(err)
}
credentialType = C.OCI_SESSGET_CREDEXT
ocises = authInfo
} else {
if err = srv.checkClosed(); err != nil {
return nil, errE(err)
}
// allocate session handle
if ocises, err = srv.env.allocOciHandle(C.OCI_HTYPE_SESSION); err != nil {
return nil, errE(err)
}
//srv.logF(true, "CRED_EXT? %t username=%q", credentialType == C.OCI_CRED_EXT, username)
// set driver name on the session handle
// driver name is specified to aid diagnostics; max 9 single-byte characters
// driver name will be visible in V$SESSION_CONNECT_INFO or GV$SESSION_CONNECT_INFO as CLIENT_DRIVER
drvName := fmt.Sprintf("GO%s", Version)
cDrvName := C.CString(drvName)
defer C.free(unsafe.Pointer(cDrvName))
if err = srv.env.setAttr(ocises, C.OCI_HTYPE_SESSION,
unsafe.Pointer(cDrvName), C.ub4(len(drvName)), C.OCI_ATTR_DRIVER_NAME,
); err != nil {
return nil, errE(err)
}
// http://docs.oracle.com/cd/B28359_01/appdev.111/b28395/oci07lob.htm#CHDDHFAB
// Set LOB prefetch size to chunk size
lobPrefetchSize := C.ub4(lobChunkSize)
if err = srv.env.setAttr(ocises, C.OCI_HTYPE_SESSION,
unsafe.Pointer(&lobPrefetchSize), C.ub4(0), C.OCI_ATTR_DEFAULT_LOBPREFETCH_SIZE,
); err != nil {
return nil, errE(err)
}
}
if cfg.Username != "" || cfg.Password != "" {
credentialType = C.OCI_CRED_RDBMS
if poolType != NoPool {
credentialType = C.OCI_DEFAULT
}
// set username on session handle (authInfo)
cUsername := C.CString(cfg.Username)
defer C.free(unsafe.Pointer(cUsername))
err = srv.env.setAttr(ocises, C.OCI_HTYPE_SESSION, unsafe.Pointer(cUsername), C.ub4(len(cfg.Username)), C.OCI_ATTR_USERNAME)
if err != nil {
return nil, errE(err)
}
// set password on session handle (authInfo)
cPassword := C.CString(cfg.Password)
defer C.free(unsafe.Pointer(cPassword))
err = srv.env.setAttr(ocises, C.OCI_HTYPE_SESSION, unsafe.Pointer(cPassword), C.ub4(len(cfg.Password)), C.OCI_ATTR_PASSWORD)
if err != nil {
return nil, errE(err)
}
}
// allocate service context handle
ocisvcctx, err := srv.env.allocOciHandle(C.OCI_HTYPE_SVCCTX)
if err != nil {
return nil, errE(err)
}
// set server handle onto service context handle
err = srv.env.setAttr(ocisvcctx, C.OCI_HTYPE_SVCCTX, unsafe.Pointer(srv.ocisrv), C.ub4(0), C.OCI_ATTR_SERVER)
if err != nil {
return nil, errE(err)
}
mode := C.ub4(C.OCI_DEFAULT)
var r C.sword
// begin session
switch poolType {
case CPool:
mode = C.OCI_DEFAULT | C.OCI_SESSGET_CPOOL | credentialType
case DRCPool, SPool:
mode = C.OCI_DEFAULT | C.OCI_SESSGET_SPOOL | credentialType
if cfg.Mode == SysDba {
mode |= C.OCI_SESSGET_SYSDBA
}
default:
switch cfg.Mode {
case SysDba:
mode |= C.OCI_SYSDBA
case SysOper:
mode |= C.OCI_SYSOPER
}
}
switch poolType {
case CPool, SPool, DRCPool:
srv.RLock()
r = C.OCISessionGet(
srv.env.ocienv, //OCIEnv *envhp,
srv.env.ocierr, //OCIError *errhp,
(**C.OCISvcCtx)(unsafe.Pointer(&ocisvcctx)), //OCISvcCtx *svchp,
(*C.OCIAuthInfo)(authInfo), //OCIAuthInfo *authInfop,
srv.ociPoolName, //OraText *dbName,
srv.ociPoolNameLen, //ub4 dbName_len,
nil, //CONST OraText *tagInfo,
0, //ub4 tagInfo_len,
nil, //OraText **retTagInfo,
nil, //ub4 *retTagInfo_len,
nil, //boolean *found,
mode, //ub4 mode );
)
srv.RUnlock()
if r == C.OCI_ERROR {
return nil, errE(srv.env.ociError())
}
r = C.OCIAttrGet(
ocisvcctx, //const void *trgthndlp,
C.OCI_HTYPE_SVCCTX, //ub4 trghndltyp,
unsafe.Pointer(&ocises), //void *attributep,
nil, //ub4 *sizep,
C.OCI_ATTR_SESSION, //ub4 attrtype,
srv.env.ocierr) //OCIError *errhp );
if r == C.OCI_ERROR {
return nil, errE(srv.env.ociError())
}
default:
srv.RLock()
r = C.OCISessionBegin(
(*C.OCISvcCtx)(ocisvcctx), //OCISvcCtx *svchp,
srv.env.ocierr, //OCIError *errhp,
(*C.OCISession)(ocises), //OCISession *usrhp,
credentialType, //ub4 credt,
mode, //ub4 mode,
)
srv.RUnlock()
if r == C.OCI_ERROR {
return nil, errE(srv.env.ociError())
}
// set session handle on service context handle
err = srv.env.setAttr(unsafe.Pointer(ocisvcctx), C.OCI_HTYPE_SVCCTX, ocises, C.ub4(0), C.OCI_ATTR_SESSION)
if err != nil {
return nil, errE(err)
}
}
// set stmt cache size to zero
// https://docs.oracle.com/database/121/LNOCI/oci09adv.htm#LNOCI16655
stmtCacheSize := C.ub4(0)
err = srv.env.setAttr(unsafe.Pointer(ocisvcctx), C.OCI_HTYPE_SVCCTX, unsafe.Pointer(&stmtCacheSize), C.ub4(0), C.OCI_ATTR_STMTCACHESIZE)
if err != nil {
return nil, errE(err)
}
ses = _drv.sesPool.Get().(*Ses) // set *Ses
ses.cmu.Lock()
defer ses.cmu.Unlock()
ses.Lock()
ses.env.Store(srv.env)
ses.srv = srv
ses.ocisvcctx = (*C.OCISvcCtx)(ocisvcctx)
ses.ocises = (*C.OCISession)(ocises)
if ses.id == 0 {
ses.id = _drv.sesId.nextId()
}
ses.Unlock()
ses.SetCfg(cfg)
srv.openSess.add(ses)
return ses, nil
}
// Version returns the Oracle database server version.
//
// Version requires the server have at least one open session.
func (srv *Srv) Version() (ver string, err error) {
srv.log(_drv.Cfg().Log.Srv.Version)
err = srv.checkClosed()
if err != nil {
return "", errE(err)
}
var buf [512]C.char
srv.RLock()
r := C.OCIServerVersion(
unsafe.Pointer(srv.ocisrv), //void *hndlp,
srv.env.ocierr, //OCIError *errhp,
(*C.OraText)(unsafe.Pointer(&buf[0])), //OraText *bufp,
C.ub4(len(buf)), //ub4 bufsz
C.OCI_HTYPE_SERVER) //ub1 hndltype );
srv.RUnlock()
if r == C.OCI_ERROR {
return "", errE(srv.env.ociError())
}
return C.GoString(&buf[0]), nil
}
// NumSes returns the number of open Oracle sessions.
func (srv *Srv) NumSes() int {
if srv == nil {
return 0
}
srv.RLock()
openSess := srv.openSess
srv.RUnlock()
return openSess.len()
}
// IsUTF8 returns whether the DB uses AL32UTF8 encoding.
func (srv *Srv) IsUTF8() bool {
if srv == nil {
return false
}
return atomic.LoadInt32(&srv.isUTF8) == 1
}
// IsOpen returns true when the server is open; otherwise, false.
//
// Calling Close will cause Srv.IsOpen to return false. Once closed, a server cannot
// be re-opened. Call Env.OpenSrv to open a new server.
func (srv *Srv) IsOpen() bool {
return srv.checkClosed() == nil
}
// checkClosed returns an error if Srv is closed. No locking occurs.
func (srv *Srv) checkClosed() error {
if srv == nil {
return er("Srv is closed.")
}
srv.RLock()
closed := srv.ocisrv == nil
env := srv.env
srv.RUnlock()
if closed {
return er("Srv is closed.")
}
return env.checkClosed()
}
// sysName returns a string representing the Ses.
func (srv *Srv) sysName() string {
if srv == nil {
return "E_S_"
}
return srv.sysNamer.Name(func() string { return fmt.Sprintf("%sS%v", srv.env.sysName(), srv.id) })
}
// log writes a message with an Srv system name and caller info.
func (srv *Srv) log(enabled bool, v ...interface{}) {
Log := _drv.Cfg().Log
if !Log.IsEnabled(enabled) {
return
}
if len(v) == 0 {
Log.Logger.Infof("%v %v", srv.sysName(), callInfo(1))
} else {
Log.Logger.Infof("%v %v %v", srv.sysName(), callInfo(1), fmt.Sprint(v...))
}
}
// log writes a formatted message with an Srv system name and caller info.
func (srv *Srv) logF(enabled bool, format string, v ...interface{}) {
Log := _drv.Cfg().Log
if !Log.IsEnabled(enabled) {
return
}
if len(v) == 0 {
Log.Logger.Infof("%v %v", srv.sysName(), callInfo(1))
} else {
Log.Logger.Infof("%v %v %v", srv.sysName(), callInfo(1), fmt.Sprintf(format, v...))
}
}