// CreateSession creates a new session environment.
func CreateSession(store kv.Storage) (Session, error) {
s := &session{
values: make(map[fmt.Stringer]interface{}),
store: store,
sid: atomic.AddInt64(&sessionID, 1),
debugInfos: make(map[string]interface{}),
maxRetryCnt: 10,
parser: parser.New(),
}
domain, err := domap.Get(store)
if err != nil {
return nil, errors.Trace(err)
}
sessionctx.BindDomain(s, domain)
variable.BindSessionVars(s)
variable.GetSessionVars(s).SetStatusFlag(mysql.ServerStatusAutocommit, true)
// session implements variable.GlobalVarAccessor. Bind it to ctx.
variable.BindGlobalVarAccessor(s, s)
// session implements autocommit.Checker. Bind it to ctx
autocommit.BindAutocommitChecker(s, s)
sessionMu.Lock()
defer sessionMu.Unlock()
ver := getStoreBootstrapVersion(store)
if ver == notBootstrapped {
// if no bootstrap and storage is remote, we must use a little lease time to
// bootstrap quickly, after bootstrapped, we will reset the lease time.
// TODO: Using a bootstap tool for doing this may be better later.
if !localstore.IsLocalStore(store) {
sessionctx.GetDomain(s).SetLease(chooseMinLease(100*time.Millisecond, schemaLease))
}
s.SetValue(context.Initing, true)
bootstrap(s)
s.ClearValue(context.Initing)
if !localstore.IsLocalStore(store) {
sessionctx.GetDomain(s).SetLease(schemaLease)
}
finishBootstrap(store)
} else if ver < currentBootstrapVersion {
s.SetValue(context.Initing, true)
upgrade(s)
s.ClearValue(context.Initing)
}
// TODO: Add auth here
privChecker := &privileges.UserPrivileges{}
privilege.BindPrivilegeChecker(s, privChecker)
return s, nil
}
func (dm *domainMap) Get(store kv.Storage) (d *domain.Domain, err error) {
key := store.UUID()
dm.mu.Lock()
defer dm.mu.Unlock()
d = dm.domains[key]
if d != nil {
return
}
if SchemaLease <= minSchemaLease {
SchemaLease = minSchemaLease
}
lease := SchemaLease
// if storage is local storage, we may in test environment or
// run server in single machine mode, so we don't need wait
// 2 * lease time for DDL operation.
if localstore.IsLocalStore(store) {
lease = 0
}
d, err = domain.NewDomain(store, lease)
if err != nil {
return nil, errors.Trace(err)
}
dm.domains[key] = d
return
}
func (dm *domainMap) Get(store kv.Storage) (d *domain.Domain, err error) {
key := store.UUID()
dm.mu.Lock()
defer dm.mu.Unlock()
d = dm.domains[key]
if d != nil {
return
}
lease := time.Duration(0)
if !localstore.IsLocalStore(store) {
lease = schemaLease
}
d, err = domain.NewDomain(store, lease)
if err != nil {
return nil, errors.Trace(err)
}
dm.domains[key] = d
return
}
// runInBootstrapSession create a special session for boostrap to run.
// If no bootstrap and storage is remote, we must use a little lease time to
// bootstrap quickly, after bootstrapped, we will reset the lease time.
// TODO: Using a bootstap tool for doing this may be better later.
func runInBootstrapSession(store kv.Storage, bootstrap func(Session)) {
saveLease := schemaLease
if !localstore.IsLocalStore(store) {
schemaLease = chooseMinLease(schemaLease, 100*time.Millisecond)
}
s, err := createSession(store)
if err != nil {
// Bootstrap fail will cause program exit.
log.Fatal(errors.ErrorStack(err))
}
schemaLease = saveLease
s.SetValue(context.Initing, true)
bootstrap(s)
finishBootstrap(store)
s.ClearValue(context.Initing)
domain := sessionctx.GetDomain(s)
domain.Close()
domap.Delete(store)
}
func (dm *domainMap) Get(store kv.Storage) (d *domain.Domain, err error) {
key := store.UUID()
dm.mu.Lock()
defer dm.mu.Unlock()
d = dm.domains[key]
if d != nil {
return
}
lease := time.Duration(0)
if !localstore.IsLocalStore(store) {
lease = schemaLease
}
err = util.RunWithRetry(defaultMaxRetries, retryInterval, func() (retry bool, err1 error) {
d, err1 = domain.NewDomain(store, lease)
return true, errors.Trace(err1)
})
if err != nil {
return nil, errors.Trace(err)
}
dm.domains[key] = d
return
}