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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "io/ioutil" | ||
| "os" | ||
| "time" | ||
| ) | ||
|
|
||
| // results is the datastrcucture that will be saved on disk | ||
| type results struct { | ||
| File string `json:"file"` | ||
| Date time.Time `json:"date"` | ||
| Data []statistics `json:"data"` | ||
| } | ||
|
|
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| // findCache looks a for a cache file stored in the same directory than the slow | ||
| // query log. It returns true if the cache file exists, false otherwise | ||
| func findCache(f string) bool { | ||
| if _, err := os.Stat(f + ".cache"); os.IsNotExist(err) { | ||
| return false | ||
| } | ||
| return true | ||
| } | ||
|
|
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| // restoreCache reads the cache and returns its contents | ||
| func restoreCache(f string) (results, error) { | ||
| var r results | ||
| cache, err := os.Open(f + ".cache") | ||
| if err != nil { | ||
| return r, err | ||
| } | ||
| defer cache.Close() | ||
|
|
||
| rawBytes, err := ioutil.ReadAll(cache) | ||
| if err != nil { | ||
| return r, err | ||
| } | ||
|
|
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| if err := json.Unmarshal(rawBytes, &r); err != nil { | ||
| return r, err | ||
| } | ||
|
|
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| return r, nil | ||
| } | ||
|
|
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| // saveCache saves a cache in the same directory than the slow query log | ||
| func saveCache(r results) error { | ||
| file, err := json.Marshal(r) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| if err = ioutil.WriteFile(r.File+".cache", file, 0644); err != nil { | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } |
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