RecycledCloud/smartctl_exporter
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Fixes #23: Race condition with maps and goroutines

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Signed-off-by: David Randall <David@NiceGuyIT.biz>
This commit is contained in:
David Randall 2022-11-05 08:45:48 -04:00
parent 9bc77c579d
commit 18b5b8d57e
1 changed files with 12 additions and 7 deletions
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19
readjson.go
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@ -18,6 +18,7 @@ import (
"io/ioutil"
"os/exec"
"strings"
"sync"
"time"
"github.com/go-kit/log"
@ -32,11 +33,11 @@ type JSONCache struct {
}
var (
jsonCache map[string]JSONCache
jsonCache sync.Map
)
func init() {
jsonCache = make(map[string]JSONCache)
jsonCache.Store("", JSONCache{})
}
// Parse json to gjson object
@ -93,16 +94,20 @@ func readData(logger log.Logger, device string) (gjson.Result, error) {
return readFakeSMARTctl(logger, device), nil
}
cacheValue, cacheOk := jsonCache[device]
if !cacheOk || time.Now().After(cacheValue.LastCollect.Add(*smartctlInterval)) {
cacheValue, cacheOk := jsonCache.Load(device)
if !cacheOk || time.Now().After(cacheValue.(JSONCache).LastCollect.Add(*smartctlInterval)) {
json, ok := readSMARTctl(logger, device)
if ok {
jsonCache[device] = JSONCache{JSON: json, LastCollect: time.Now()}
return jsonCache[device].JSON, nil
jsonCache.Store(device, JSONCache{JSON: json, LastCollect: time.Now()})
j, found := jsonCache.Load(device)
if !found {
level.Warn(logger).Log("msg", "device not found", "device", device)
}
return j.(JSONCache).JSON, nil
}
return gjson.Parse("{}"), fmt.Errorf("smartctl returned bad data for device %s", device)
}
return cacheValue.JSON, nil
return cacheValue.(JSONCache).JSON, nil
}
// Parse smartctl return code