feat(alerting): worked on improving slack alerts

pkg/services/alerting/eval_context.go

@@ -0,0 +1,63 @@
+package alerting
+
+import (
+	"time"
+
+	"github.com/grafana/grafana/pkg/log"
+	m "github.com/grafana/grafana/pkg/models"
+)
+
+type EvalContext struct {
+	Firing      bool
+	IsTestRun   bool
+	Events      []*Event
+	Logs        []*ResultLogEntry
+	Error       error
+	Description string
+	StartTime   time.Time
+	EndTime     time.Time
+	Rule        *Rule
+	DoneChan    chan bool
+	CancelChan  chan bool
+	log         log.Logger
+}
+
+func (a *EvalContext) GetDurationMs() float64 {
+	return float64(a.EndTime.Nanosecond()-a.StartTime.Nanosecond()) / float64(1000000)
+}
+
+func (c *EvalContext) GetColor() string {
+	if !c.Firing {
+		return "#36a64f"
+	}
+
+	if c.Rule.Severity == m.AlertSeverityWarning {
+		return "#fd821b"
+	} else {
+		return "#D63232"
+	}
+}
+
+func (c *EvalContext) GetStateText() string {
+	if !c.Firing {
+		return "OK"
+	}
+
+	if c.Rule.Severity == m.AlertSeverityWarning {
+		return "WARNING"
+	} else {
+		return "CRITICAL"
+	}
+}
+
+func NewEvalContext(rule *Rule) *EvalContext {
+	return &EvalContext{
+		StartTime:  time.Now(),
+		Rule:       rule,
+		Logs:       make([]*ResultLogEntry, 0),
+		Events:     make([]*Event, 0),
+		DoneChan:   make(chan bool, 1),
+		CancelChan: make(chan bool, 1),
+		log:        log.New("alerting.engine"),
+	}
+}