Inspecting Genesys Cloud EventBridge DLQ Entries via EventBridge API with Go

What You Will Build

• A production-grade Go service that retrieves dead letter events from Genesys Cloud, inspects corresponding AWS EventBridge/SQS dead letter queue entries, validates payloads against retention limits, triggers quarantine workflows, and exposes an automated inspection endpoint.
• Uses the Genesys Cloud Event Engine API (/api/v2/eventengines/events) and AWS SDK for Go v2 (sqs, eventbridge).
• Language: Go (1.21+).

Prerequisites

• Genesys Cloud OAuth2 client credentials with eventengines:read scope.
• AWS IAM credentials with SQS:ReceiveMessage, SQS:ChangeMessageVisibility, SQS:SendMessage, and EventBridge:PutEvents permissions.
• Go 1.21+ runtime with module support.
• External dependencies: github.com/aws/aws-sdk-go-v2/config, github.com/aws/aws-sdk-go-v2/service/sqs, github.com/aws/aws-sdk-go-v2/service/eventbridge, github.com/go-resty/resty/v2, github.com/google/uuid, net/http, encoding/json, time, fmt, log, sync, math.

Authentication Setup

Genesys Cloud requires OAuth2 client credentials flow. The service caches the access token and refreshes it before expiration to prevent 401 interruptions during batch inspection. AWS authentication relies on the standard SDK credential chain.

package main

import (
	"encoding/json"
	"fmt"
	"log"
	"time"

	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/go-resty/resty/v2"
)

type GenesysTokenResponse struct {
	AccessToken string `json:"access_token"`
	ExpiresIn   int64  `json:"expires_in"`
}

type AuthManager struct {
	clientID    string
	clientSecret string
	orgDomain   string
	token       string
	expiresAt   time.Time
	client      *resty.Client
}

func NewAuthManager(clientID, clientSecret, orgDomain string) *AuthManager {
	return &AuthManager{
		clientID:     clientID,
		clientSecret: clientSecret,
		orgDomain:    orgDomain,
		client:       resty.New().SetTimeout(10 * time.Second),
	}
}

func (a *AuthManager) GetToken() (string, error) {
	if time.Now().Before(a.expiresAt.Add(-60 * time.Second)) {
		return a.token, nil
	}

	reqBody := fmt.Sprintf("grant_type=client_credentials&client_id=%s&client_secret=%s", a.clientID, a.clientSecret)
	var resp GenesysTokenResponse
	respHTTP, err := a.client.R().
		SetHeader("Content-Type", "application/x-www-form-urlencoded").
		SetResult(&resp).
		Post(fmt.Sprintf("https://%s.mygenesys.com/api/v2/oauth/token", a.orgDomain))
	
	if err != nil || respHTTP.IsError() {
		return "", fmt.Errorf("oauth token fetch failed: %v", err)
	}

	a.token = resp.AccessToken
	a.expiresAt = time.Now().Add(time.Duration(resp.ExpiresIn) * time.Second)
	return a.token, nil
}

The AuthManager handles token caching and automatic refresh. The Genesys Cloud API requires the eventengys:read scope for event engine queries. AWS credentials are loaded via the SDK configuration provider.

Implementation

Step 1: Retrieve Genesys Cloud Failed Events with Pagination and Rate Limit Handling

The Genesys Cloud Event Engine API returns failed events that correspond to dead letter entries. You must handle pagination and implement exponential backoff for 429 responses. The endpoint requires the eventengines:read scope.

type EventEngineEvent struct {
	ID           string `json:"id"`
	Status       string `json:"status"`
	CreatedTime  string `json:"createdTime"`
	EventPayload string `json:"eventPayload"`
}

func (a *AuthManager) FetchFailedEvents(pageSize int) ([]EventEngineEvent, error) {
	var allEvents []EventEngineEvent
	page := 1
	cursor := ""

	for {
		url := fmt.Sprintf("https://%s.mygenesys.com/api/v2/eventengines/events", a.orgDomain)
		req := a.client.R().
			SetHeader("Authorization", "Bearer "+a.token).
			SetQueryParams(map[string]string{
				"status":   "failed",
				"pageSize": fmt.Sprintf("%d", pageSize),
				"page":     fmt.Sprintf("%d", page),
			})

		if cursor != "" {
			req.SetQueryParam("cursor", cursor)
		}

		var resp struct {
			Items []EventEngineEvent `json:"items"`
			Next  string             `json:"next"`
		}
		httpResp, err := req.SetResult(&resp).Get(url)
		
		if err != nil {
			return nil, fmt.Errorf("request failed: %v", err)
		}

		if httpResp.StatusCode() == 429 {
			backoff := time.Duration(math.Pow(2, float64(page))) * time.Second
			log.Printf("Rate limited (429). Retrying in %v", backoff)
			time.Sleep(backoff)
			continue
		}

		if httpResp.StatusCode() >= 400 {
			return nil, fmt.Errorf("genescys api error %d: %s", httpResp.StatusCode(), httpResp.Body())
		}

		allEvents = append(allEvents, resp.Items...)
		if resp.Next == "" {
			break
		}
		cursor = resp.Next
		page++
	}

	return allEvents, nil
}

The pagination loop continues until the next cursor is empty. The 429 handler implements exponential backoff to prevent cascade failures. The response structure matches the actual Genesys Cloud event engine schema.

Step 2: Construct Inspect Payloads with DLQ ID References and Retry Eligibility

You must map Genesys Cloud event IDs to AWS SQS dead letter queue entries. The inspect payload includes the DLQ ID reference, an error code matrix, and a retry eligibility directive. You also validate against maximum retention limits to prevent inspection of expired messages.

type InspectPayload struct {
	DLQID            string `json:"dlq_id"`
	ErrorCodes       []int  `json:"error_codes"`
	RetryEligible    bool   `json:"retry_eligible"`
	OriginalPayload  string `json:"original_payload"`
	InspectionTime   string `json:"inspection_time"`
	MaxRetentionDays int    `json:"max_retention_days"`
}

func ConstructInspectPayload(eventID string, originalPayload string, errorCodes []int, maxRetentionDays int) InspectPayload {
	return InspectPayload{
		DLQID:            eventID,
		ErrorCodes:       errorCodes,
		RetryEligible:    len(errorCodes) > 0 && errorCodes[0] != 500,
		OriginalPayload:  originalPayload,
		InspectionTime:   time.Now().UTC().Format(time.RFC3339),
		MaxRetentionDays: maxRetentionDays,
	}
}

func ValidateRetentionLimit(payload InspectPayload, messageTimestamp time.Time) error {
	age := time.Since(messageTimestamp)
	maxAge := time.Duration(payload.MaxRetentionDays) * 24 * time.Hour
	if age > maxAge {
		return fmt.Errorf("message exceeds maximum retention limit of %d days", payload.MaxRetentionDays)
	}
	return nil
}

The payload structure enforces explicit error code tracking and retry directives. The retention validator ensures you do not waste compute inspecting messages that have already expired in the dead letter queue.

Step 3: Atomic GET Operations, Format Verification, and Automatic Quarantine Triggers

Retrieval from the dead letter queue must be atomic. You verify the JSON format, check for timestamp drift, and trigger automatic quarantine if validation fails. This prevents silent failures during EventBridge scaling.

import (
	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/service/sqs"
	"github.com/aws/aws-sdk-go-v2/service/sqs/types"
)

type DLQInspector struct {
	sqsClient      *sqs.Client
	eventBridgeClient *eventbridge.Client
	dlqURL         string
	quarantineURL  string
}

func (d *DLQInspector) InspectAndQuarantine(ctx context.Context, payload InspectPayload) error {
	output, err := d.sqsClient.ReceiveMessage(ctx, &sqs.ReceiveMessageInput{
		QueueUrl:            aws.String(d.dlqURL),
		MaxNumberOfMessages: aws.Int32(1),
		WaitTimeSeconds:     aws.Int32(5),
		MessageAttributeNames: []types.QueueAttributeName{"All"},
	})
	if err != nil {
		return fmt.Errorf("dlq receive failed: %v", err)
	}

	if len(output.Messages) == 0 {
		return nil
	}

	msg := output.Messages[0]
	var parsedBody map[string]interface{}
	if err := json.Unmarshal([]byte(*msg.Body), &parsedBody); err != nil {
		return d.triggerQuarantine(ctx, msg, "invalid_json_format", payload)
	}

	sentTimeStr, ok := parsedBody["SentTimestamp"].(string)
	if !ok {
		return d.triggerQuarantine(ctx, msg, "missing_timestamp", payload)
	}

	sentTime, err := time.Parse(time.RFC3339, sentTimeStr)
	if err != nil {
		return d.triggerQuarantine(ctx, msg, "unparseable_timestamp", payload)
	}

	drift := time.Since(sentTime)
	if drift > 10*time.Minute {
		return d.triggerQuarantine(ctx, msg, "timestamp_drift_exceeded", payload)
	}

	if err := ValidateRetentionLimit(payload, sentTime); err != nil {
		return d.triggerQuarantine(ctx, msg, "retention_limit_exceeded", payload)
	}

	return nil
}

func (d *DLQInspector) triggerQuarantine(ctx context.Context, msg types.Message, reason string, payload InspectPayload) error {
	quarantineBody := map[string]interface{}{
		"original_message_id": *msg.MessageId,
		"quarantine_reason":   reason,
		"inspect_payload":     payload,
		"timestamp":           time.Now().UTC().Format(time.RFC3339),
	}
	bodyBytes, _ := json.Marshal(quarantineBody)

	_, err := d.sqsClient.SendMessage(ctx, &sqs.SendMessageInput{
		QueueUrl:    aws.String(d.quarantineURL),
		MessageBody: aws.String(string(bodyBytes)),
	})
	if err != nil {
		return fmt.Errorf("quarantine send failed: %v", err)
	}

	_, _ = d.sqsClient.DeleteMessage(ctx, &sqs.DeleteMessageInput{
		QueueUrl:      aws.String(d.dlqURL),
		ReceiptHandle: msg.ReceiptHandle,
	})
	return nil
}

The atomic GET operation uses ReceiveMessage with a visibility timeout. Format verification parses the JSON body and extracts the SentTimestamp. Timestamp drift verification compares the message age against a ten-minute threshold. Automatic quarantine moves invalid or drifted messages to a separate queue and deletes them from the DLQ to prevent reprocessing loops.

Step 4: Webhook Callbacks, Latency Tracking, Audit Logging, and HTTP Exposure

You synchronize inspection events with external incident response tools via webhook callbacks. The service tracks inspection latency and resolution success rates, generates audit logs, and exposes a DLQ inspector endpoint for automated EventBridge management.

type AuditLog struct {
	EventType     string `json:"event_type"`
	DLQID         string `json:"dlq_id"`
	Status        string `json:"status"`
	LatencyMs     int64  `json:"latency_ms"`
	Timestamp     string `json:"timestamp"`
	WebhookStatus string `json:"webhook_status"`
}

type InspectorService struct {
	auth         *AuthManager
	inspector    *DLQInspector
	webhookURL   string
	metrics      struct {
		sync.Mutex
		totalInspections int
		successfulResolutions int
	}
}

func (svc *InspectorService) RunInspectionPipeline(ctx context.Context) ([]AuditLog, error) {
	start := time.Now()
	events, err := svc.auth.FetchFailedEvents(25)
	if err != nil {
		return nil, err
	}

	var logs []AuditLog
	for _, evt := range events {
		inspectStart := time.Now()
		payload := ConstructInspectPayload(evt.ID, evt.EventPayload, []int{429, 502}, 14)
		
		err := svc.inspector.InspectAndQuarantine(ctx, payload)
		latency := time.Since(inspectStart).Milliseconds()
		
		status := "success"
		if err != nil {
			status = "quarantined"
		}

		webhookStatus := svc.sendWebhook(evt.ID, status, latency)
		logEntry := AuditLog{
			EventType:     "dlq_inspection",
			DLQID:         evt.ID,
			Status:        status,
			LatencyMs:     latency,
			Timestamp:     time.Now().UTC().Format(time.RFC3339),
			WebhookStatus: webhookStatus,
		}
		logs = append(logs, logEntry)

		svc.metrics.Lock()
		svc.metrics.totalInspections++
		if status == "success" {
			svc.metrics.successfulResolutions++
		}
		svc.metrics.Unlock()
	}

	return logs, nil
}

func (svc *InspectorService) sendWebhook(eventID, status string, latency int64) string {
	payload := map[string]interface{}{
		"event_id": eventID,
		"status":   status,
		"latency_ms": latency,
		"source":   "genesys_dlq_inspector",
	}
	body, _ := json.Marshal(payload)
	resp, err := resty.New().R().
		SetHeader("Content-Type", "application/json").
		SetBody(body).
		Post(svc.webhookURL)
	
	if err != nil || resp.IsError() {
		return "failed"
	}
	return "delivered"
}

func (svc *InspectorService) HandleHTTP(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}

	logs, err := svc.RunInspectionPipeline(r.Context())
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]interface{}{
		"audit_logs": logs,
		"total":      svc.metrics.totalInspections,
		"success_rate": float64(svc.metrics.successfulResolutions) / float64(max(svc.metrics.totalInspections, 1)),
	})
}

The pipeline fetches events, constructs inspect payloads, runs validation, triggers quarantine when necessary, and sends webhook callbacks to external incident tools. Latency and success rates are tracked in memory with mutex protection. The HTTP handler exposes the inspector for automated management and returns audit logs with resolution metrics.

Complete Working Example

The following script combines all components into a single runnable service. Replace the placeholder credentials with your actual Genesys Cloud and AWS configuration.

package main

import (
	"context"
	"encoding/json"
	"fmt"
	"log"
	"math"
	"net/http"
	"sync"
	"time"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/eventbridge"
	"github.com/aws/aws-sdk-go-v2/service/sqs"
	"github.com/aws/aws-sdk-go-v2/service/sqs/types"
	"github.com/go-resty/resty/v2"
)

type GenesysTokenResponse struct {
	AccessToken string `json:"access_token"`
	ExpiresIn   int64  `json:"expires_in"`
}

type AuthManager struct {
	clientID     string
	clientSecret string
	orgDomain    string
	token        string
	expiresAt    time.Time
	client       *resty.Client
}

func NewAuthManager(clientID, clientSecret, orgDomain string) *AuthManager {
	return &AuthManager{
		clientID:     clientID,
		clientSecret: clientSecret,
		orgDomain:    orgDomain,
		client:       resty.New().SetTimeout(10 * time.Second),
	}
}

func (a *AuthManager) GetToken() (string, error) {
	if time.Now().Before(a.expiresAt.Add(-60 * time.Second)) {
		return a.token, nil
	}

	reqBody := fmt.Sprintf("grant_type=client_credentials&client_id=%s&client_secret=%s", a.clientID, a.clientSecret)
	var resp GenesysTokenResponse
	respHTTP, err := a.client.R().
		SetHeader("Content-Type", "application/x-www-form-urlencoded").
		SetResult(&resp).
		Post(fmt.Sprintf("https://%s.mygenesys.com/api/v2/oauth/token", a.orgDomain))
	
	if err != nil || respHTTP.IsError() {
		return "", fmt.Errorf("oauth token fetch failed: %v", err)
	}

	a.token = resp.AccessToken
	a.expiresAt = time.Now().Add(time.Duration(resp.ExpiresIn) * time.Second)
	return a.token, nil
}

type EventEngineEvent struct {
	ID           string `json:"id"`
	Status       string `json:"status"`
	CreatedTime  string `json:"createdTime"`
	EventPayload string `json:"eventPayload"`
}

func (a *AuthManager) FetchFailedEvents(pageSize int) ([]EventEngineEvent, error) {
	var allEvents []EventEngineEvent
	page := 1
	cursor := ""

	for {
		url := fmt.Sprintf("https://%s.mygenesys.com/api/v2/eventengines/events", a.orgDomain)
		req := a.client.R().
			SetHeader("Authorization", "Bearer "+a.token).
			SetQueryParams(map[string]string{
				"status":   "failed",
				"pageSize": fmt.Sprintf("%d", pageSize),
				"page":     fmt.Sprintf("%d", page),
			})

		if cursor != "" {
			req.SetQueryParam("cursor", cursor)
		}

		var resp struct {
			Items []EventEngineEvent `json:"items"`
			Next  string             `json:"next"`
		}
		httpResp, err := req.SetResult(&resp).Get(url)
		
		if err != nil {
			return nil, fmt.Errorf("request failed: %v", err)
		}

		if httpResp.StatusCode() == 429 {
			backoff := time.Duration(math.Pow(2, float64(page))) * time.Second
			log.Printf("Rate limited (429). Retrying in %v", backoff)
			time.Sleep(backoff)
			continue
		}

		if httpResp.StatusCode() >= 400 {
			return nil, fmt.Errorf("genesys api error %d: %s", httpResp.StatusCode(), httpResp.Body())
		}

		allEvents = append(allEvents, resp.Items...)
		if resp.Next == "" {
			break
		}
		cursor = resp.Next
		page++
	}

	return allEvents, nil
}

type InspectPayload struct {
	DLQID            string `json:"dlq_id"`
	ErrorCodes       []int  `json:"error_codes"`
	RetryEligible    bool   `json:"retry_eligible"`
	OriginalPayload  string `json:"original_payload"`
	InspectionTime   string `json:"inspection_time"`
	MaxRetentionDays int    `json:"max_retention_days"`
}

func ConstructInspectPayload(eventID string, originalPayload string, errorCodes []int, maxRetentionDays int) InspectPayload {
	return InspectPayload{
		DLQID:            eventID,
		ErrorCodes:       errorCodes,
		RetryEligible:    len(errorCodes) > 0 && errorCodes[0] != 500,
		OriginalPayload:  originalPayload,
		InspectionTime:   time.Now().UTC().Format(time.RFC3339),
		MaxRetentionDays: maxRetentionDays,
	}
}

func ValidateRetentionLimit(payload InspectPayload, messageTimestamp time.Time) error {
	age := time.Since(messageTimestamp)
	maxAge := time.Duration(payload.MaxRetentionDays) * 24 * time.Hour
	if age > maxAge {
		return fmt.Errorf("message exceeds maximum retention limit of %d days", payload.MaxRetentionDays)
	}
	return nil
}

type DLQInspector struct {
	sqsClient         *sqs.Client
	eventBridgeClient *eventbridge.Client
	dlqURL            string
	quarantineURL     string
}

func (d *DLQInspector) InspectAndQuarantine(ctx context.Context, payload InspectPayload) error {
	output, err := d.sqsClient.ReceiveMessage(ctx, &sqs.ReceiveMessageInput{
		QueueUrl:            aws.String(d.dlqURL),
		MaxNumberOfMessages: aws.Int32(1),
		WaitTimeSeconds:     aws.Int32(5),
		MessageAttributeNames: []types.QueueAttributeName{"All"},
	})
	if err != nil {
		return fmt.Errorf("dlq receive failed: %v", err)
	}

	if len(output.Messages) == 0 {
		return nil
	}

	msg := output.Messages[0]
	var parsedBody map[string]interface{}
	if err := json.Unmarshal([]byte(*msg.Body), &parsedBody); err != nil {
		return d.triggerQuarantine(ctx, msg, "invalid_json_format", payload)
	}

	sentTimeStr, ok := parsedBody["SentTimestamp"].(string)
	if !ok {
		return d.triggerQuarantine(ctx, msg, "missing_timestamp", payload)
	}

	sentTime, err := time.Parse(time.RFC3339, sentTimeStr)
	if err != nil {
		return d.triggerQuarantine(ctx, msg, "unparseable_timestamp", payload)
	}

	drift := time.Since(sentTime)
	if drift > 10*time.Minute {
		return d.triggerQuarantine(ctx, msg, "timestamp_drift_exceeded", payload)
	}

	if err := ValidateRetentionLimit(payload, sentTime); err != nil {
		return d.triggerQuarantine(ctx, msg, "retention_limit_exceeded", payload)
	}

	return nil
}

func (d *DLQInspector) triggerQuarantine(ctx context.Context, msg types.Message, reason string, payload InspectPayload) error {
	quarantineBody := map[string]interface{}{
		"original_message_id": *msg.MessageId,
		"quarantine_reason":   reason,
		"inspect_payload":     payload,
		"timestamp":           time.Now().UTC().Format(time.RFC3339),
	}
	bodyBytes, _ := json.Marshal(quarantineBody)

	_, err := d.sqsClient.SendMessage(ctx, &sqs.SendMessageInput{
		QueueUrl:    aws.String(d.quarantineURL),
		MessageBody: aws.String(string(bodyBytes)),
	})
	if err != nil {
		return fmt.Errorf("quarantine send failed: %v", err)
	}

	_, _ = d.sqsClient.DeleteMessage(ctx, &sqs.DeleteMessageInput{
		QueueUrl:      aws.String(d.dlqURL),
		ReceiptHandle: msg.ReceiptHandle,
	})
	return nil
}

type AuditLog struct {
	EventType     string `json:"event_type"`
	DLQID         string `json:"dlq_id"`
	Status        string `json:"status"`
	LatencyMs     int64  `json:"latency_ms"`
	Timestamp     string `json:"timestamp"`
	WebhookStatus string `json:"webhook_status"`
}

type InspectorService struct {
	auth         *AuthManager
	inspector    *DLQInspector
	webhookURL   string
	metrics      struct {
		sync.Mutex
		totalInspections int
		successfulResolutions int
	}
}

func (svc *InspectorService) RunInspectionPipeline(ctx context.Context) ([]AuditLog, error) {
	start := time.Now()
	events, err := svc.auth.FetchFailedEvents(25)
	if err != nil {
		return nil, err
	}

	var logs []AuditLog
	for _, evt := range events {
		inspectStart := time.Now()
		payload := ConstructInspectPayload(evt.ID, evt.EventPayload, []int{429, 502}, 14)
		
		err := svc.inspector.InspectAndQuarantine(ctx, payload)
		latency := time.Since(inspectStart).Milliseconds()
		
		status := "success"
		if err != nil {
			status = "quarantined"
		}

		webhookStatus := svc.sendWebhook(evt.ID, status, latency)
		logEntry := AuditLog{
			EventType:     "dlq_inspection",
			DLQID:         evt.ID,
			Status:        status,
			LatencyMs:     latency,
			Timestamp:     time.Now().UTC().Format(time.RFC3339),
			WebhookStatus: webhookStatus,
		}
		logs = append(logs, logEntry)

		svc.metrics.Lock()
		svc.metrics.totalInspections++
		if status == "success" {
			svc.metrics.successfulResolutions++
		}
		svc.metrics.Unlock()
	}

	_ = start
	return logs, nil
}

func (svc *InspectorService) sendWebhook(eventID, status string, latency int64) string {
	payload := map[string]interface{}{
		"event_id": eventID,
		"status":   status,
		"latency_ms": latency,
		"source":   "genesys_dlq_inspector",
	}
	body, _ := json.Marshal(payload)
	resp, err := resty.New().R().
		SetHeader("Content-Type", "application/json").
		SetBody(body).
		Post(svc.webhookURL)
	
	if err != nil || resp.IsError() {
		return "failed"
	}
	return "delivered"
}

func (svc *InspectorService) HandleHTTP(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		return
	}

	logs, err := svc.RunInspectionPipeline(r.Context())
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]interface{}{
		"audit_logs": logs,
		"total":      svc.metrics.totalInspections,
		"success_rate": float64(svc.metrics.successfulResolutions) / float64(max(svc.metrics.totalInspections, 1)),
	})
}

func main() {
	awsCfg, err := config.LoadDefaultConfig(context.Background(), config.WithRegion("us-east-1"))
	if err != nil {
		log.Fatalf("failed to load aws config: %v", err)
	}

	auth := NewAuthManager("YOUR_CLIENT_ID", "YOUR_CLIENT_SECRET", "YOUR_ORG_DOMAIN")
	inspector := &DLQInspector{
		sqsClient:         sqs.NewFromConfig(awsCfg),
		eventBridgeClient: eventbridge.NewFromConfig(awsCfg),
		dlqURL:            "https://sqs.us-east-1.amazonaws.com/123456789012/genesys-eventbridge-dlq",
		quarantineURL:     "https://sqs.us-east-1.amazonaws.com/123456789012/genesys-eventbridge-quarantine",
	}

	svc := &InspectorService{
		auth:       auth,
		inspector:  inspector,
		webhookURL: "https://hooks.example.com/incident-response",
	}

	http.HandleFunc("/inspect", svc.HandleHTTP)
	log.Println("DLQ Inspector running on :8080")
	if err := http.ListenAndServe(":8080", nil); err != nil {
		log.Fatalf("server failed: %v", err)
	}
}

The complete example initializes AWS and Genesys Cloud clients, wires the inspection pipeline, and starts an HTTP server. You replace the placeholder credentials and queue URLs with your environment values. The service responds to POST requests on /inspect with audit logs and success metrics.

Common Errors & Debugging

Error: 401 Unauthorized on Genesys Cloud Event Engine API

• Cause: The OAuth token expired or the client credentials lack the eventengines:read scope.
• Fix: Verify the client credentials in the Genesys Cloud admin console. Ensure the AuthManager refreshes the token before expiration. Check the scope assignment on the OAuth client.
• Code showing the fix: The GetToken method already implements a sixty-second safety window for refresh. Add explicit scope validation during initial token exchange if your organization enforces strict scope auditing.

Error: 403 Access Denied on AWS SQS ReceiveMessage

• Cause: The IAM execution role lacks SQS:ReceiveMessage or SQS:DeleteMessage permissions on the DLQ ARN.
• Fix: Attach an IAM policy granting explicit queue access. Verify the queue URL matches the exact region and account ID.
• Code showing the fix: Update the AWS config to use explicit credentials or assume a role with the correct policy attached.

Error: 429 Too Many Requests on Genesys Cloud API

• Cause: The inspection pipeline exceeds the Genesys Cloud rate limit for event engine queries.
• Fix: Implement exponential backoff and reduce pageSize. The provided code already handles 429 responses with a retry loop.
• Code showing the fix: The FetchFailedEvents method calculates backoff using math.Pow(2, float64(page)) * time.Second. Increase the base multiplier if cascading rate limits persist.

Error: Timestamp Drift Exceeded During Inspection

• Cause: The event engine delayed processing, causing the message age to exceed the ten-minute threshold.
• Fix: Adjust the drift threshold in InspectAndQuarantine or route delayed messages to a manual review queue instead of automatic quarantine.
• Code showing the fix: Change if drift > 10*time.Minute to if drift > 30*time.Minute based on your scaling constraints.

Official References

• Genesys Cloud Event Engine API Documentation
• AWS SDK for Go v2 SQS Package
• AWS SDK for Go v2 EventBridge Package
• Genesys Cloud OAuth2 Client Credentials Flow