/
error_data.go
233 lines (209 loc) · 5.16 KB
/
error_data.go
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package database
import (
"bosun.org/models"
"encoding/json"
"fmt"
"github.com/garyburd/redigo/redis"
"time"
)
/*
failingAlerts = set of currently failing alerts
alertsWithErrors = set of alerts with any errors
errorEvents = list of (alert) one per individual error event
error:{name} = list of json objects for coalesced error events (most recent first).
*/
type ErrorDataAccess interface {
MarkAlertSuccess(name string) error
MarkAlertFailure(name string, msg string) error
GetFailingAlertCounts() (int, int, error)
GetFailingAlerts() (map[string]bool, error)
IsAlertFailing(name string) (bool, error)
GetFullErrorHistory() (map[string][]*models.AlertError, error)
ClearAlert(name string) error
ClearAll() error
}
func (d *dataAccess) Errors() ErrorDataAccess {
return d
}
const (
failingAlerts = "failingAlerts"
errorEvents = "errorEvents"
alertsWithErrors = "alertsWithErrors"
)
func (d *dataAccess) MarkAlertSuccess(name string) error {
conn := d.Get()
defer conn.Close()
_, err := conn.Do("SREM", failingAlerts, name)
return err
}
func (d *dataAccess) MarkAlertFailure(name string, msg string) error {
conn := d.Get()
defer conn.Close()
failing, err := d.IsAlertFailing(name)
if err != nil {
return err
}
if _, err := conn.Do("SADD", alertsWithErrors, name); err != nil {
return err
}
if _, err := conn.Do("SADD", failingAlerts, name); err != nil {
return err
}
var event *models.AlertError
if failing {
event, err = d.getLastErrorEvent(name)
if err != nil {
return err
}
}
now := time.Now().UTC().Truncate(time.Second)
if event == nil || event.Message != msg {
event = &models.AlertError{
FirstTime: now,
LastTime: now,
Count: 1,
Message: msg,
}
} else {
event.Count++
event.LastTime = now
// pop prior record
_, err = conn.Do("LPOP", errorListKey(name))
if err != nil {
return err
}
}
marshalled, err := json.Marshal(event)
if err != nil {
return err
}
_, err = conn.Do("LPUSH", errorListKey(name), marshalled)
if err != nil {
return err
}
_, err = conn.Do("LPUSH", errorEvents, name)
return err
}
func (d *dataAccess) GetFailingAlertCounts() (int, int, error) {
conn := d.Get()
defer conn.Close()
failing, err := redis.Int(conn.Do("SCARD", failingAlerts))
if err != nil {
return 0, 0, err
}
events, err := redis.Int(conn.Do("LLEN", errorEvents))
if err != nil {
return 0, 0, err
}
return failing, events, nil
}
func (d *dataAccess) GetFailingAlerts() (map[string]bool, error) {
conn := d.Get()
defer conn.Close()
alerts, err := redis.Strings(conn.Do("SMEMBERS", failingAlerts))
if err != nil {
return nil, err
}
r := make(map[string]bool, len(alerts))
for _, a := range alerts {
r[a] = true
}
return r, nil
}
func (d *dataAccess) IsAlertFailing(name string) (bool, error) {
conn := d.Get()
defer conn.Close()
return redis.Bool(conn.Do("SISMEMBER", failingAlerts, name))
}
func errorListKey(name string) string {
return fmt.Sprintf("errors:%s", name)
}
func (d *dataAccess) getLastErrorEvent(name string) (*models.AlertError, error) {
conn := d.Get()
defer conn.Close()
str, err := redis.Bytes(conn.Do("LINDEX", errorListKey(name), "0"))
if err != nil {
if err == redis.ErrNil {
return nil, nil
}
return nil, err
}
ev := &models.AlertError{}
if err = json.Unmarshal(str, ev); err != nil {
return nil, err
}
return ev, nil
}
func (d *dataAccess) GetFullErrorHistory() (map[string][]*models.AlertError, error) {
conn := d.Get()
defer conn.Close()
alerts, err := redis.Strings(conn.Do("SMEMBERS", alertsWithErrors))
if err != nil {
return nil, err
}
results := make(map[string][]*models.AlertError, len(alerts))
for _, a := range alerts {
rows, err := redis.Strings(conn.Do("LRANGE", errorListKey(a), 0, -1))
if err != nil {
return nil, err
}
list := make([]*models.AlertError, len(rows))
for i, row := range rows {
ae := &models.AlertError{}
err = json.Unmarshal([]byte(row), ae)
if err != nil {
return nil, err
}
list[i] = ae
}
results[a] = list
}
return results, nil
}
func (d *dataAccess) ClearAlert(name string) error {
conn := d.Get()
defer conn.Close()
_, err := conn.Do("SREM", alertsWithErrors, name)
if err != nil {
return err
}
_, err = conn.Do("SREM", failingAlerts, name)
if err != nil {
return err
}
_, err = conn.Do(d.LCLEAR(), errorListKey(name))
if err != nil {
return err
}
cmd, args := d.LMCLEAR(errorEvents, name)
_, err = conn.Do(cmd, args...)
if err != nil {
return err
}
return nil
}
//Things could forseeably get a bit inconsistent if concurrent changes happen in just the wrong way.
//Clear all should do a more thourogh cleanup to fully reset things.
func (d *dataAccess) ClearAll() error {
conn := d.Get()
defer conn.Close()
alerts, err := redis.Strings(conn.Do("SMEMBERS", alertsWithErrors))
if err != nil {
return err
}
for _, a := range alerts {
if _, err := conn.Do(d.LCLEAR(), errorListKey(a)); err != nil {
return err
}
}
if _, err := conn.Do(d.SCLEAR(), alertsWithErrors); err != nil {
return err
}
if _, err := conn.Do(d.SCLEAR(), failingAlerts); err != nil {
return err
}
if _, err = conn.Do(d.LCLEAR(), errorEvents); err != nil {
return err
}
return nil
}