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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| package cache | ||
|
|
||
| import ( | ||
| "context" | ||
| "database/sql/driver" | ||
| "fmt" | ||
| "strings" | ||
| ) | ||
|
|
||
| type ( | ||
| queryKey struct{} | ||
| stmtKey struct{} | ||
| argsKey struct{} | ||
| queryerCtxKey struct{} | ||
| namedValueArgsKey struct{} | ||
| ) | ||
|
|
||
| func ExportMetrics() string { | ||
| res := "" | ||
| for query, cache := range caches { | ||
| stats := cache.cache.Stats() | ||
| progress := "[" | ||
| for i := 0; i < 20; i++ { | ||
| if i < int(stats.HitRatio()*20) { | ||
| progress += "#" | ||
| } else { | ||
| progress += "-" | ||
| } | ||
| } | ||
| statsStr := fmt.Sprintf("%s (%.2f%% - %d/%d) (%d replace) (size %d)", progress, stats.HitRatio()*100, stats.Hits, stats.Misses+stats.Hits, stats.Replacements, stats.Size) | ||
| res += fmt.Sprintf("query: \"%s\"\n%s\n\n", query, statsStr) | ||
| } | ||
| return res | ||
| } | ||
|
|
||
| type CacheStats struct { | ||
| Query string | ||
| HitRatio float64 | ||
| Hits int | ||
| Misses int | ||
| } | ||
|
|
||
| func ExportCacheStats() map[string]CacheStats { | ||
| res := make(map[string]CacheStats) | ||
| for query, cache := range caches { | ||
| stats := cache.cache.Stats() | ||
| res[query] = CacheStats{ | ||
| Query: query, | ||
| HitRatio: stats.HitRatio(), | ||
| Hits: int(stats.Hits), | ||
| Misses: int(stats.Misses), | ||
| } | ||
| } | ||
| return res | ||
| } | ||
|
|
||
| func PurgeAllCaches() { | ||
| for _, cache := range caches { | ||
| cache.cache.Purge() | ||
| } | ||
| } | ||
|
|
||
| func cacheName(query string) string { | ||
| return query | ||
| } | ||
|
|
||
| func cacheKey(args []driver.Value) string { | ||
| var b strings.Builder | ||
| for _, arg := range args { | ||
| switch v := arg.(type) { | ||
| case string: | ||
| b.WriteString(v) | ||
| case []byte: | ||
| b.Write(v) | ||
| default: | ||
| fmt.Fprintf(&b, "%v", v) | ||
| } | ||
| // delimiter | ||
| b.WriteByte(0) | ||
| } | ||
| return b.String() | ||
| } | ||
|
|
||
| func replaceFn(ctx context.Context, key string) (*cacheRows, error) { | ||
| queryerCtx, ok := ctx.Value(queryerCtxKey{}).(driver.QueryerContext) | ||
| if ok { | ||
| query := ctx.Value(queryKey{}).(string) | ||
| nvargs := ctx.Value(namedValueArgsKey{}).([]driver.NamedValue) | ||
| rows, err := queryerCtx.QueryContext(ctx, query, nvargs) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| cacheRows, err := newCacheRows(rows) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return cacheRows.clone(), nil | ||
| } | ||
|
|
||
| stmt := ctx.Value(stmtKey{}).(*customCacheStatement) | ||
| args := ctx.Value(argsKey{}).([]driver.Value) | ||
| rows, err := stmt.inner.Query(args) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| cacheRows, err := newCacheRows(rows) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return cacheRows.clone(), nil | ||
| } |
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