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default_sync_rule.go
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/
default_sync_rule.go
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package rule
import (
"github.com/juju/errors"
)
// Sync errors
var (
ErrRuleConflict = errors.New("Rule conflicts")
)
type defaultSchemaRule struct {
ruleContainer
desc SyncDesc
// Table rule
tablesRule map[string]*SyncDesc
passAll bool
}
func (r *defaultSchemaRule) addRule(desc *SyncDesc) error {
var err error
if nil == r.tablesRule {
r.tablesRule = make(map[string]*SyncDesc)
}
// Initialize schema info
if "" == r.desc.Schema && "" == r.desc.RewriteSchema {
r.desc.Schema = desc.Schema
r.desc.RewriteSchema = desc.RewriteSchema
}
if r.desc.Schema != desc.Schema || r.desc.RewriteSchema != desc.RewriteSchema {
return errors.Trace(ErrRuleConflict)
}
// If desc.Table is empty, we should handle the rule as full pass rule
if "" == desc.Table {
r.passAll = true
return nil
}
ts, ok := r.tablesRule[desc.Table]
if ok {
return errors.Trace(ErrRuleConflict)
}
// Make a copy
ndesc := *desc
ts = &ndesc
r.tablesRule[desc.Table] = ts
if err = r.ruleContainer.add(desc.Table, ts); nil != err {
return errors.Trace(err)
}
return nil
}
func (r *defaultSchemaRule) canSync(table string) *SyncDesc {
if nil == r.tablesRule {
return nil
}
// Do search
desc := r.find(table)
if nil != desc {
return desc
}
if r.passAll {
// Full pass
return &SyncDesc{
Schema: r.desc.Schema,
RewriteSchema: r.desc.RewriteSchema,
Table: table,
RewriteTable: table,
}
}
return nil
}
// DefaultSyncRule implements the rule of sync
type DefaultSyncRule struct {
ruleContainer
// Schema rule
schemasRule map[string]*defaultSchemaRule
}
// NewDefaultSyncRule creates a new NewDefaultSyncRule
func NewDefaultSyncRule() *DefaultSyncRule {
r := &DefaultSyncRule{}
r.init()
return r
}
// NewDefaultSyncRuleWithRules creates a new DefaultSyncRule with rules
func NewDefaultSyncRuleWithRules(rs []*SyncDesc) (*DefaultSyncRule, error) {
r := NewDefaultSyncRule()
for _, v := range rs {
err := r.NewRule(v)
if nil != err {
return nil, errors.Trace(err)
}
}
return r, nil
}
// NewDefaultSyncRuleFromJSON creates a new DefaultSyncRule from json data
func NewDefaultSyncRuleFromJSON(data []byte) (*DefaultSyncRule, error) {
rc := NewDefaultSyncConfig()
rs, err := rc.ParseJSON(data)
if nil != err {
return nil, errors.Trace(err)
}
return NewDefaultSyncRuleWithRules(rs)
}
// CanSyncTable implements ISyncRule CanSyncTable
func (r *DefaultSyncRule) CanSyncTable(schema, table string) *SyncDesc {
if nil == r.schemasRule {
// If is nil, always pass all schema and table
return &SyncDesc{
Schema: schema,
Table: table,
RewriteSchema: schema,
RewriteTable: table,
}
}
// Find schema rule
schemaDesc := r.find(schema)
if nil == schemaDesc {
return nil
}
schemaRule, ok := r.schemasRule[schemaDesc.Schema]
if !ok {
return nil
}
return schemaRule.canSync(table)
}
// NewRule implements ISyncRule NewRule
func (r *DefaultSyncRule) NewRule(desc *SyncDesc) error {
if err := desc.Validate(); nil != err {
return errors.Trace(err)
}
if nil == r.schemasRule {
r.schemasRule = make(map[string]*defaultSchemaRule)
}
sr, ok := r.schemasRule[desc.Schema]
if !ok {
sr = &defaultSchemaRule{}
sr.init()
}
if err := sr.addRule(desc); nil != err {
return errors.Trace(err)
}
r.schemasRule[desc.Schema] = sr
// Add schema search
cpy := *desc
if err := r.add(cpy.Schema, &cpy); nil != err {
return errors.Trace(err)
}
return nil
}