mirror of
https://github.com/weaveworks/scope.git
synced 2026-03-03 18:20:27 +00:00
73 lines
1.4 KiB
Go
73 lines
1.4 KiB
Go
package process
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import (
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"strconv"
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"strings"
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"time"
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"github.com/armon/go-metrics"
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"github.com/coocood/freecache"
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"github.com/weaveworks/scope/common/fs"
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)
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const (
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generalTimeout = 30 // seconds
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statsTimeout = 10 //seconds
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)
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var (
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hitMetricsKey = []string{"process", "cache", "hit"}
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missMetricsKey = []string{"process", "cache", "miss"}
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)
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var fileCache = freecache.NewCache(1024 * 16)
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type entry struct {
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buf []byte
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err error
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ts time.Time
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}
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func cachedReadFile(path string) ([]byte, error) {
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key := []byte(path)
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if v, err := fileCache.Get(key); err == nil {
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metrics.IncrCounter(hitMetricsKey, 1.0)
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return v, nil
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}
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buf, err := fs.ReadFile(path)
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fileCache.Set(key, buf, generalTimeout)
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metrics.IncrCounter(missMetricsKey, 1.0)
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return buf, err
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}
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// we cache the stats, but for a shorter period
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func readStats(path string) (int, int, error) {
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var (
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key = []byte(path)
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buf []byte
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err error
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)
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if buf, err = fileCache.Get(key); err == nil {
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metrics.IncrCounter(hitMetricsKey, 1.0)
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} else {
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buf, err = fs.ReadFile(path)
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if err != nil {
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return -1, -1, err
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}
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fileCache.Set(key, buf, statsTimeout)
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metrics.IncrCounter(missMetricsKey, 1.0)
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}
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splits := strings.Fields(string(buf))
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ppid, err := strconv.Atoi(splits[3])
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if err != nil {
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return -1, -1, err
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}
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threads, err := strconv.Atoi(splits[19])
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if err != nil {
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return -1, -1, err
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}
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return ppid, threads, nil
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}
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