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Support switch storage engine by prefix
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| package cassandra | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "sync" | ||
|
|
||
| "github.com/douban/gobeansproxy/config" | ||
| "github.com/viant/ptrie" | ||
| ) | ||
|
|
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| type PrefixSwitchStatus int | ||
|
|
||
| const ( | ||
| // bdb r/w c* disable | ||
| PrefixSwitchBrw PrefixSwitchStatus = 0 | ||
| // bdb r/w c* w | ||
| PrefixSwitchBrwCw PrefixSwitchStatus = 1 | ||
| // bdb w c* r/w | ||
| PrefixSwitchBwCrw PrefixSwitchStatus = 2 | ||
| // c* rw bdb disable | ||
| PrefixSwitchCrw PrefixSwitchStatus = 3 | ||
| statusBrw string = "br1w1cr0w0" | ||
| statusBrwCw string = "br1w1cr0w1" | ||
| statusBwCrw string = "br0w1cr1w1" | ||
| statusCrw string = "br0w0cr1w1" | ||
| ) | ||
|
|
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| type PrefixSwitcher struct { | ||
| trie *ptrie.Trie | ||
| defaultT PrefixSwitchStatus | ||
| lock sync.RWMutex | ||
| } | ||
|
|
||
| func strToSwitchStatus(s string) (PrefixSwitchStatus, error) { | ||
| switch s { | ||
| case statusBrw: | ||
| return PrefixSwitchBrw, nil | ||
| case statusBrwCw: | ||
| return PrefixSwitchBrwCw, nil | ||
| case statusBwCrw: | ||
| return PrefixSwitchBwCrw, nil | ||
| case statusCrw: | ||
| return PrefixSwitchCrw, nil | ||
| default: | ||
| return -1, fmt.Errorf("Unsupported switch type of %s", s) | ||
| } | ||
| } | ||
|
|
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| func GetPrefixSwitchTrieFromCfg(cfg *config.CassandraStoreCfg) (*ptrie.Trie, error) { | ||
| s2k := cfg.SwitchToKeyPrefixes | ||
| prefixTrie := ptrie.New() | ||
|
|
||
| for s, kprefixs := range s2k { | ||
| status, err := strToSwitchStatus(s) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| for _, prefix := range kprefixs { | ||
| err := prefixTrie.Put([]byte(prefix), int(status)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return &prefixTrie, nil | ||
| } | ||
|
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| func NewPrefixSwitcher(config *config.CassandraStoreCfg) (*PrefixSwitcher, error) { | ||
| prefixTrie, err := GetPrefixSwitchTrieFromCfg(config) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| f := new(PrefixSwitcher) | ||
| f.trie = prefixTrie | ||
| f.defaultT = PrefixSwitchBrw | ||
| return f, nil | ||
| } | ||
|
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| func (s *PrefixSwitcher) GetStatus(key string) PrefixSwitchStatus { | ||
| s.lock.RLock() | ||
| defer s.lock.RUnlock() | ||
|
|
||
| var result int | ||
| v := (*(s.trie)).MatchPrefix([]byte(key), func(key []byte, value interface{}) bool { | ||
| result = value.(int) | ||
| return true | ||
| }) | ||
|
|
||
| if !v { | ||
| return s.defaultT | ||
| } | ||
| return PrefixSwitchStatus(result) | ||
| } | ||
|
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||
| // check key prefix and return bdb read enable c* read enable | ||
| func (s *PrefixSwitcher) ReadEnabledOn(key string) (bool, bool) { | ||
| status := s.GetStatus(key) | ||
| return (status == PrefixSwitchBrw || status == PrefixSwitchBrwCw), | ||
| (status == PrefixSwitchCrw || status == PrefixSwitchBwCrw) | ||
| } | ||
|
|
||
| // check keys prefix list and return bdb read keys and c* read keys | ||
| func (s *PrefixSwitcher) ReadEnableOnKeys(keys []string) (bkeys []string, ckeys []string) { | ||
| for _, k := range keys { | ||
| b, c := s.ReadEnabledOn(k) | ||
| if b { | ||
| bkeys = append(bkeys, k) | ||
| } | ||
|
|
||
| if c { | ||
| ckeys = append(ckeys, k) | ||
| } | ||
| } | ||
| return | ||
| } | ||
|
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||
| // check key prefix and return bdb write enable c* write enable | ||
| func (s *PrefixSwitcher) WriteEnabledOn(key string) (bool, bool) { | ||
| status := s.GetStatus(key) | ||
| return (status == PrefixSwitchBrw || status == PrefixSwitchBrwCw || status == PrefixSwitchBwCrw), | ||
| (status == PrefixSwitchCrw || status == PrefixSwitchBrwCw || status == PrefixSwitchBwCrw) | ||
| } | ||
|
|
||
| func (s *PrefixSwitcher) LoadCfg(cfgDir string) error { | ||
| cfg := config.ProxyConfig{} | ||
| cfg.InitDefault() | ||
| cfg.Load(cfgDir) | ||
|
|
||
| pTrie, err := GetPrefixSwitchTrieFromCfg(&cfg.CassandraStoreCfg) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| s.lock.Lock() | ||
| defer s.lock.Unlock() | ||
| s.trie = pTrie | ||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,3 @@ | ||
| less | ||
| python3-pip | ||
| python-is-python3 |
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