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Merge pull request #82 from warptools/normalize-regen
Normalize regen
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| package testutil | ||
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| import ( | ||
| "log" | ||
| "math/rand" | ||
| "regexp" | ||
| "strings" | ||
| "sync" | ||
|
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| "github.com/google/uuid" | ||
| "github.com/icholy/replace" | ||
| ) | ||
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| var reGuidJson = regexp.MustCompile(`"guid": "(?P<GUID>[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12})"`) | ||
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| type GuidMapper struct { | ||
| mapping map[string]string | ||
| randSource rand.Source | ||
| mappingMutex sync.Mutex | ||
| } | ||
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| func NewGuidMapper(r rand.Source) *GuidMapper { | ||
| // Create a new source with a constant seed | ||
| if r == nil { | ||
| r = rand.NewSource(424242) | ||
| } | ||
| return &GuidMapper{ | ||
| mapping: make(map[string]string), | ||
| randSource: r, | ||
| } | ||
| } | ||
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| // Transformer returns a transform.Transformer for mapping GUIDs on streams | ||
| func (gm *GuidMapper) Transformer() *replace.RegexpTransformer { | ||
| return replace.RegexpStringSubmatchFunc(reGuidJson, gm.replacer) | ||
| } | ||
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| // get will return the mapping for the requested guid. | ||
| // If the guid is unmapped, a new guid will be created. | ||
| // GuidMapper uses a known random source so mapped guids should be deterministic | ||
| // by order of requested guids. | ||
| func (gm *GuidMapper) get(guid string) string { | ||
| gm.mappingMutex.Lock() | ||
| defer gm.mappingMutex.Unlock() | ||
| if newGuid, exists := gm.mapping[guid]; exists { | ||
| return newGuid | ||
| } | ||
|
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| // If the GUID is not in the mapping, generate a new one | ||
| // Uses rand with a deterministic source so that a deterministic order is preserved. | ||
| r := rand.New(gm.randSource) | ||
| randBuf := make([]byte, 16) | ||
| r.Read(randBuf) | ||
| newGuid := uuid.NewSHA1(uuid.Nil, randBuf).String() | ||
| gm.mapping[guid] = newGuid | ||
| return newGuid | ||
| } | ||
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| // replacer implements the function for replace.RegexpStringSubmatchFunc. | ||
| func (gm *GuidMapper) replacer(match []string) string { | ||
| result := match[0] | ||
| log.Println(match) | ||
| for _, guid := range match[1:] { | ||
| if _, err := uuid.Parse(guid); err != nil { | ||
| continue | ||
| } | ||
| newGuid := gm.get(guid) | ||
| result = strings.ReplaceAll(result, guid, newGuid) | ||
| } | ||
| log.Println(result) | ||
| return result | ||
| } |
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