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* refactor guid out of utils * cleanup
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,178 @@ | ||
| // Copyright 2023 LiveKit, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package guid | ||
|
|
||
| import ( | ||
| "crypto/rand" | ||
| "crypto/sha1" | ||
| "fmt" | ||
| mrand "math/rand/v2" | ||
| "os" | ||
| "sync" | ||
|
|
||
| "github.com/jxskiss/base62" | ||
| "github.com/lithammer/shortuuid/v4" | ||
|
|
||
| "github.com/livekit/protocol/livekit" | ||
| "github.com/livekit/protocol/utils/must" | ||
| ) | ||
|
|
||
| const ( | ||
| Size = 12 | ||
| guidScratchSize = Size + 10 | ||
| ) | ||
|
|
||
| const ( | ||
| RoomPrefix = "RM_" | ||
| NodePrefix = "ND_" | ||
| ParticipantPrefix = "PA_" | ||
| TrackPrefix = "TR_" | ||
| APIKeyPrefix = "API" | ||
| EgressPrefix = "EG_" | ||
| IngressPrefix = "IN_" | ||
| SIPTrunkPrefix = "ST_" | ||
| SIPDispatchRulePrefix = "SDR_" | ||
| SIPCallPrefix = "SCL_" | ||
| RPCPrefix = "RPC_" | ||
| WHIPResourcePrefix = "WH_" | ||
| RTMPResourcePrefix = "RT_" | ||
| URLResourcePrefix = "UR_" | ||
| AgentWorkerPrefix = "AW_" | ||
| AgentJobPrefix = "AJ_" | ||
| ) | ||
|
|
||
| var guidGeneratorPool = sync.Pool{ | ||
| New: func() any { | ||
| return must.Get(newGenerator(guidScratchSize)) | ||
| }, | ||
| } | ||
|
|
||
| func New(prefix string) string { | ||
| g := guidGeneratorPool.Get().(*guidGenerator) | ||
| defer guidGeneratorPool.Put(g) | ||
| return g.New(prefix) | ||
| } | ||
|
|
||
| // HashedID creates a hashed ID from a unique string | ||
| func HashedID(id string) string { | ||
| h := sha1.New() | ||
| h.Write([]byte(id)) | ||
| val := h.Sum(nil) | ||
|
|
||
| return base62.EncodeToString(val) | ||
| } | ||
|
|
||
| func LocalNodeID() (string, error) { | ||
| hostname, err := os.Hostname() | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return fmt.Sprintf("%s%s", NodePrefix, HashedID(hostname)[:8]), nil | ||
| } | ||
|
|
||
| var b57Index = newB57Index() | ||
| var b57Chars = []byte(shortuuid.DefaultAlphabet) | ||
|
|
||
| func newB57Index() [256]byte { | ||
| var index [256]byte | ||
| for i := 0; i < len(b57Chars); i++ { | ||
| index[b57Chars[i]] = byte(i) | ||
| } | ||
| return index | ||
| } | ||
|
|
||
| type guidGenerator struct { | ||
| scratch []byte | ||
| rng *mrand.ChaCha8 | ||
| } | ||
|
|
||
| func newGenerator(scratchSize int) (*guidGenerator, error) { | ||
| var seed [32]byte | ||
| if _, err := rand.Read(seed[:]); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &guidGenerator{ | ||
| scratch: make([]byte, scratchSize), | ||
| rng: mrand.NewChaCha8(seed), | ||
| }, nil | ||
| } | ||
|
|
||
| func (g *guidGenerator) readIDChars(b []byte) { | ||
| var n int | ||
| for { | ||
| r := g.rng.Uint64() | ||
| for i := 0; i < 10; i++ { | ||
| if int(r&0x3f) < len(b57Chars) { | ||
| b[n] = b57Chars[r&0x3f] | ||
| n++ | ||
| if n == len(b) { | ||
| return | ||
| } | ||
| } | ||
| r >>= 6 | ||
| } | ||
| } | ||
| } | ||
|
|
||
| func (g *guidGenerator) New(prefix string) string { | ||
| s := append(g.scratch[:0], make([]byte, len(prefix)+Size)...) | ||
| copy(s, prefix) | ||
| g.readIDChars(s[len(prefix):]) | ||
| return string(s) | ||
| } | ||
|
|
||
| func guidPrefix[T livekit.Guid]() string { | ||
| var id T | ||
| switch any(id).(type) { | ||
| case livekit.TrackID: | ||
| return TrackPrefix | ||
| case livekit.ParticipantID: | ||
| return ParticipantPrefix | ||
| case livekit.RoomID: | ||
| return RoomPrefix | ||
| default: | ||
| panic("unreachable") | ||
| } | ||
| } | ||
|
|
||
| func Marshal[T livekit.Guid](id T) livekit.GuidBlock { | ||
| var b livekit.GuidBlock | ||
| idb := []byte(id)[len(id)-Size:] | ||
| for i := 0; i < 3; i++ { | ||
| j := i * 3 | ||
| k := i * 4 | ||
| b[j] = b57Index[idb[k]]<<2 | b57Index[idb[k+1]]>>4 | ||
| b[j+1] = b57Index[idb[k+1]]<<4 | b57Index[idb[k+2]]>>2 | ||
| b[j+2] = b57Index[idb[k+2]]<<6 | b57Index[idb[k+3]] | ||
| } | ||
| return b | ||
| } | ||
|
|
||
| func Unmarshal[T livekit.Guid](b livekit.GuidBlock) T { | ||
| prefix := guidPrefix[T]() | ||
| id := make([]byte, len(prefix)+Size) | ||
| copy(id, []byte(prefix)) | ||
| idb := id[len(prefix):] | ||
| for i := 0; i < 3; i++ { | ||
| j := i * 3 | ||
| k := i * 4 | ||
| idb[k] = b57Chars[b[j]>>2] | ||
| idb[k+1] = b57Chars[(b[j]&3)<<4|b[j+1]>>4] | ||
| idb[k+2] = b57Chars[(b[j+1]&15)<<2|b[j+2]>>6] | ||
| idb[k+3] = b57Chars[b[j+2]&63] | ||
| } | ||
| return T(id) | ||
| } |
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