chore: initial import from sless/shared-sqs (v0.1.14)

- Standalone SQS-service repository
- Multi-tenant message queue service, AWS SQS compatible
- Based on GoAws, with mutable tenants, auth, WebUI, Redis persistence
- Ready for independent development and deployment
- See doc/ and README.md for architecture and usage

app/models/helpers.go

@@ -0,0 +1,48 @@
+package models
+
+import (
+	"errors"
+	"fmt"
+	"math/rand"
+	"time"
+)
+
+// ---- Unit Tests ----
+func ResetApp() {
+	CurrentEnvironment = Environment{}
+	ResetResources()
+}
+
+func ResetResources() {
+	SyncQueues.Lock()
+	SyncQueues.Queues = make(map[string]*Queue)
+	SyncQueues.Unlock()
+}
+
+func stringInSlice(a string, list []string) bool {
+	for _, b := range list {
+		if b == a {
+			return true
+		}
+	}
+	return false
+}
+
+func generateRandomLatency() (time.Duration, error) {
+	min := CurrentEnvironment.RandomLatency.Min
+	max := CurrentEnvironment.RandomLatency.Max
+	if min == 0 && max == 0 {
+		return time.Duration(0), nil
+	}
+	var randomLatencyValue int
+	if max == min {
+		randomLatencyValue = max
+	} else {
+		randomLatencyValue = rand.Intn(max-min) + min
+	}
+	randomDuration, err := time.ParseDuration(fmt.Sprintf("%dms", randomLatencyValue))
+	if err != nil {
+		return time.Duration(0), errors.New(fmt.Sprintf("Error parsing random latency value: %dms", randomLatencyValue))
+	}
+	return randomDuration, nil
+}