Sending Genesys Cloud Webchat Bot Messages via WebSocket with Go
What You Will Build
A production-ready Go module that connects to Genesys Cloud Webchat v3, constructs and validates bot message payloads with interaction ID references, card matrices, and action button directives, enforces client constraints and maximum size limits, manages atomic sequence-numbered transmission, tracks latency and delivery rates, synchronizes with external analytics via callbacks, generates structured audit logs, and exposes a type-safe sender interface for automated chat management.
Prerequisites
- Go 1.21 or later
- OAuth 2.0 Client Credentials grant with
webchat:urls:writescope gorilla/websocketv1.5.0+github.com/go-playground/validator/v10v10.12.0+- Genesys Cloud environment ID and valid client credentials
- Standard library packages:
context,crypto/tls,encoding/json,log/slog,net/http,sync,sync/atomic,time,fmt
Authentication Setup
Genesys Cloud Webchat does not accept OAuth tokens directly over the WebSocket connection. You must first exchange client credentials for an access token, then request a temporary Webchat URL. The URL generation endpoint enforces rate limits and returns a 429 status when thresholds are exceeded. The following code implements a retryable REST client for token acquisition and URL generation.
package main
import (
"context"
"crypto/tls"
"encoding/json"
"fmt"
"net/http"
"time"
)
type OAuthTokenResponse struct {
AccessToken string `json:"access_token"`
TokenType string `json:"token_type"`
ExpiresIn int64 `json:"expires_in"`
}
type WebchatURLResponse struct {
URL string `json:"url"`
}
func getOAuthToken(ctx context.Context, envID, clientID, clientSecret string) (*OAuthTokenResponse, error) {
url := fmt.Sprintf("https://%s.mypurecloud.com/oauth/token", envID)
payload := fmt.Sprintf(`{"grant_type":"client_credentials","client_id":"%s","client_secret":"%s"}`, clientID, clientSecret)
client := &http.Client{
Timeout: 10 * time.Second,
Transport: &http.Transport{
TLSClientConfig: &tls.Config{MinVersion: tls.VersionTLS12},
},
}
var tokenResp OAuthTokenResponse
var lastErr error
// Retry logic for 429 rate limiting
for attempt := 0; attempt < 3; attempt++ {
req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, nil)
if err != nil {
return nil, fmt.Errorf("failed to create token request: %w", err)
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Authorization", "Basic "+base64Encode(clientID+":"+clientSecret))
resp, err := client.Do(req)
if err != nil {
lastErr = fmt.Errorf("token request failed: %w", err)
continue
}
defer resp.Body.Close()
if resp.StatusCode == http.StatusTooManyRequests {
retryAfter := 2 * time.Second
time.Sleep(retryAfter)
lastErr = fmt.Errorf("token endpoint rate limited")
continue
}
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("token request failed with status %d", resp.StatusCode)
}
if err := json.NewDecoder(resp.Body).Decode(&tokenResp); err != nil {
lastErr = fmt.Errorf("failed to decode token response: %w", err)
continue
}
return &tokenResp, nil
}
return nil, fmt.Errorf("exhausted retries for token: %w", lastErr)
}
func getWebchatURL(ctx context.Context, envID, token string) (string, error) {
url := fmt.Sprintf("https://%s.mypurecloud.com/api/v2/webchat/urls", envID)
payload := `{"name":"BotIntegration","description":"Automated Webchat Sender"}`
client := &http.Client{Timeout: 10 * time.Second}
var urlResp WebchatURLResponse
var lastErr error
for attempt := 0; attempt < 3; attempt++ {
req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, nil)
if err != nil {
return "", fmt.Errorf("failed to create url request: %w", err)
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("Authorization", "Bearer "+token)
req.Body = httpBody(payload)
resp, err := client.Do(req)
if err != nil {
lastErr = fmt.Errorf("url request failed: %w", err)
continue
}
defer resp.Body.Close()
if resp.StatusCode == http.StatusTooManyRequests {
time.Sleep(2 * time.Second)
lastErr = fmt.Errorf("url endpoint rate limited")
continue
}
if resp.StatusCode != http.StatusOK {
return "", fmt.Errorf("url request failed with status %d", resp.StatusCode)
}
if err := json.NewDecoder(resp.Body).Decode(&urlResp); err != nil {
lastErr = fmt.Errorf("failed to decode url response: %w", err)
continue
}
return urlResp.URL, nil
}
return "", fmt.Errorf("exhausted retries for webchat url: %w", lastErr)
}
func httpBody(s string) io.ReadCloser {
return io.NopCloser(strings.NewReader(s))
}
func base64Encode(s string) string {
return base64.StdEncoding.EncodeToString([]byte(s))
}
Implementation
Step 1: WebSocket Connection and Session State Verification
The Webchat v3 protocol requires a persistent WebSocket connection. You must verify the session state before transmitting messages. The connection handler maintains a connected flag and a write mutex to prevent concurrent frame corruption.
package main
import (
"context"
"fmt"
"log/slog"
"sync"
"time"
"github.com/gorilla/websocket"
)
type WebchatSession struct {
conn *websocket.Conn
mu sync.Mutex
connected bool
seq uint64
logger *slog.Logger
}
func NewWebchatSession(ctx context.Context, wsURL string) (*WebchatSession, error) {
dialer := websocket.Dialer{
HandshakeTimeout: 10 * time.Second,
}
conn, resp, err := dialer.DialContext(ctx, wsURL, nil)
if err != nil {
return nil, fmt.Errorf("websocket dial failed: %w", err)
}
defer resp.Body.Close()
session := &WebchatSession{
conn: conn,
connected: true,
logger: slog.Default(),
}
// Start ping/pong keepalive
go session.keepAlive()
return session, nil
}
func (s *WebchatSession) keepAlive() {
ticker := time.NewTicker(30 * time.Second)
defer ticker.Stop()
for range ticker.C {
if !s.IsConnected() {
return
}
s.mu.Lock()
err := s.conn.WriteMessage(websocket.TextMessage, []byte(`{"type":"ping"}`))
s.mu.Unlock()
if err != nil {
s.connected = false
s.logger.Error("keepalive failed", "error", err)
return
}
}
}
func (s *WebchatSession) IsConnected() bool {
s.mu.Lock()
defer s.mu.Unlock()
return s.connected
}
Step 2: Payload Construction and Schema Validation
Genesys Cloud Webchat clients enforce strict schema constraints. Messages must not exceed 10,240 bytes. Cards require valid type matrices, and buttons must contain explicit action directives. The following struct and validator enforce these rules before transmission.
package main
import (
"encoding/json"
"fmt"
"github.com/go-playground/validator/v10"
)
type Card struct {
Type string `json:"type" validate:"required,oneof=info action"`
Title string `json:"title,omitempty" validate:"max=100"`
Description string `json:"description,omitempty" validate:"max=500"`
ImageURL string `json:"image_url,omitempty" validate:"omitempty,url"`
}
type Button struct {
Type string `json:"type" validate:"required,oneof=postback submit"`
Label string `json:"label" validate:"required,max=50"`
Payload string `json:"payload" validate:"required,max=200"`
Action string `json:"action" validate:"required,oneof=url postback"`
}
type WebchatMessage struct {
Type string `json:"type" validate:"required,eq=message"`
Direction string `json:"direction" validate:"required,eq=inbound"`
InteractionID string `json:"interactionId" validate:"required,uuid"`
ConversationID string `json:"conversationId" validate:"required,uuid"`
MessageID string `json:"messageId" validate:"required,uuid"`
Text string `json:"text,omitempty" validate:"max=4000"`
Cards []Card `json:"cards,omitempty" validate:"dive"`
Buttons []Button `json:"buttons,omitempty" validate:"dive,max=10"`
Seq uint64 `json:"seq"`
Timestamp string `json:"timestamp"`
}
var validate = validator.New()
func ValidatePayload(msg WebchatMessage) error {
if err := validate.Struct(msg); err != nil {
return fmt.Errorf("schema validation failed: %w", err)
}
payloadBytes, err := json.Marshal(msg)
if err != nil {
return fmt.Errorf("json marshal failed: %w", err)
}
// Genesys client constraint: maximum 10KB per frame
if len(payloadBytes) > 10240 {
return fmt.Errorf("payload size %d bytes exceeds 10240 byte limit", len(payloadBytes))
}
return nil
}
Step 3: Atomic Transmission and Sequence Management
WebSocket writes are not thread-safe in Go. You must serialize writes using a mutex and increment sequence numbers atomically. The sender wraps the transmission in a single critical section to guarantee frame integrity.
package main
import (
"context"
"encoding/json"
"fmt"
"log/slog"
"sync/atomic"
"time"
)
type SendMetrics struct {
TotalSent uint64
TotalFailed uint64
AvgLatencyMS float64
LastSendTime time.Time
}
type WebchatSender struct {
session *WebchatSession
metrics *SendMetrics
logger *slog.Logger
}
func NewWebchatSender(session *WebchatSession) *WebchatSender {
return &WebchatSender{
session: session,
metrics: &SendMetrics{},
logger: slog.Default(),
}
}
func (s *WebchatSender) Send(ctx context.Context, msg WebchatMessage) error {
if !s.session.IsConnected() {
return fmt.Errorf("session disconnected")
}
// Assign sequence and timestamp
msg.Seq = atomic.AddUint64(&s.session.seq, 1)
msg.Timestamp = time.Now().UTC().Format(time.RFC3339Nano)
if err := ValidatePayload(msg); err != nil {
return fmt.Errorf("payload validation failed: %w", err)
}
start := time.Now()
s.session.mu.Lock()
defer s.session.mu.Unlock()
payload, err := json.Marshal(msg)
if err != nil {
return fmt.Errorf("payload serialization failed: %w", err)
}
err = s.session.conn.WriteMessage(websocket.TextMessage, payload)
latency := time.Since(start)
if err != nil {
atomic.AddUint64(&s.metrics.TotalFailed, 1)
s.logger.Error("transmission failed", "seq", msg.Seq, "latency_ms", latency.Milliseconds(), "error", err)
return fmt.Errorf("websocket write failed: %w", err)
}
atomic.AddUint64(&s.metrics.TotalSent, 1)
s.metrics.LastSendTime = time.Now()
s.metrics.AvgLatencyMS = float64(latency.Milliseconds())
s.logger.Info("message sent", "seq", msg.Seq, "latency_ms", latency.Milliseconds())
return nil
}
Step 4: Analytics Callbacks, Latency Tracking, and Audit Logging
Production systems require external analytics synchronization and governance audit trails. The sender exposes callback hooks that fire after successful transmission. Latency and delivery rates are aggregated in memory, while structured logs capture interaction governance data.
package main
import (
"context"
"encoding/json"
"fmt"
"log/slog"
"time"
)
type AnalyticsCallback func(event map[string]interface{})
type AuditLogCallback func(entry map[string]interface{})
type ConfiguredSender struct {
*WebchatSender
analyticsCb AnalyticsCallback
auditCb AuditLogCallback
}
func NewConfiguredSender(sess *WebchatSession, analyticsCb AnalyticsCallback, auditCb AuditLogCallback) *ConfiguredSender {
return &ConfiguredSender{
WebchatSender: NewWebchatSender(sess),
analyticsCb: analyticsCb,
auditCb: auditCb,
}
}
func (s *ConfiguredSender) Send(ctx context.Context, msg WebchatMessage) error {
err := s.WebchatSender.Send(ctx, msg)
auditEntry := map[string]interface{}{
"timestamp": time.Now().UTC().Format(time.RFC3339Nano),
"interactionId": msg.InteractionID,
"conversationId": msg.ConversationID,
"messageId": msg.MessageID,
"seq": msg.Seq,
"status": "failed",
"error": "",
}
if err == nil {
auditEntry["status"] = "success"
analyticsEvent := map[string]interface{}{
"event_type": "bot_message_sent",
"interaction_id": msg.InteractionID,
"conversation_id": msg.ConversationID,
"message_id": msg.MessageID,
"seq": msg.Seq,
"latency_ms": time.Since(s.metrics.LastSendTime).Milliseconds(),
"payload_size": len(msg.Text) + len(msg.Buttons),
}
if s.analyticsCb != nil {
s.analyticsCb(analyticsEvent)
}
} else {
auditEntry["error"] = err.Error()
}
if s.auditCb != nil {
s.auditCb(auditEntry)
}
return err
}
func (s *ConfiguredSender) GetMetrics() map[string]interface{} {
total := s.metrics.TotalSent + s.metrics.TotalFailed
deliveryRate := 0.0
if total > 0 {
deliveryRate = float64(s.metrics.TotalSent) / float64(total)
}
return map[string]interface{}{
"total_sent": s.metrics.TotalSent,
"total_failed": s.metrics.TotalFailed,
"delivery_rate": deliveryRate,
"avg_latency_ms": s.metrics.AvgLatencyMS,
"last_send": s.metrics.LastSendTime.Format(time.RFC3339),
}
}
Complete Working Example
The following script assembles all components into a runnable executable. It authenticates, establishes the WebSocket session, constructs a validated card-and-button payload, transmits it with sequence tracking, and exposes metrics.
package main
import (
"context"
"encoding/base64"
"encoding/json"
"fmt"
"io"
"log/slog"
"net/http"
"os"
"strings"
"time"
)
func main() {
ctx := context.Background()
envID := os.Getenv("GENESYS_ENV_ID")
clientID := os.Getenv("GENESYS_CLIENT_ID")
clientSecret := os.Getenv("GENESYS_CLIENT_SECRET")
if envID == "" || clientID == "" || clientSecret == "" {
fmt.Fprintln(os.Stderr, "Missing environment variables")
os.Exit(1)
}
slog.Info("Acquiring OAuth token")
token, err := getOAuthToken(ctx, envID, clientID, clientSecret)
if err != nil {
slog.Error("Token acquisition failed", "error", err)
os.Exit(1)
}
slog.Info("Generating Webchat URL")
wsURL, err := getWebchatURL(ctx, envID, token.AccessToken)
if err != nil {
slog.Error("Webchat URL generation failed", "error", err)
os.Exit(1)
}
slog.Info("Connecting to Webchat WebSocket")
session, err := NewWebchatSession(ctx, wsURL)
if err != nil {
slog.Error("WebSocket connection failed", "error", err)
os.Exit(1)
}
analyticsCb := func(event map[string]interface{}) {
data, _ := json.Marshal(event)
slog.Info("Analytics callback triggered", "event", string(data))
}
auditCb := func(entry map[string]interface{}) {
data, _ := json.Marshal(entry)
slog.Info("Audit log recorded", "entry", string(data))
}
sender := NewConfiguredSender(session, analyticsCb, auditCb)
msg := WebchatMessage{
Type: "message",
Direction: "inbound",
InteractionID: "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
ConversationID: "b2c3d4e5-f6a7-8901-bcde-f12345678901",
MessageID: "c3d4e5f6-a7b8-9012-cdef-123456789012",
Text: "Select an action below.",
Cards: []Card{
{Type: "info", Title: "System Status", Description: "All services operational"},
},
Buttons: []Button{
{Type: "postback", Label: "Acknowledge", Payload: "ACK", Action: "postback"},
{Type: "submit", Label: "Escalate", Payload: "ESCALATE", Action: "url"},
},
}
slog.Info("Sending bot message")
err = sender.Send(ctx, msg)
if err != nil {
slog.Error("Send operation failed", "error", err)
}
metrics := sender.GetMetrics()
slog.Info("Transmission metrics", "metrics", metrics)
time.Sleep(5 * time.Second)
}
Common Errors and Debugging
Error: 401 Unauthorized on Webchat URL Generation
This occurs when the OAuth token lacks the webchat:urls:write scope or has expired. Verify your client credentials configuration in the Genesys Cloud admin console. Regenerate the token with the correct scope and ensure the token is passed in the Authorization: Bearer header.
Error: WebSocket Write Error: Broken Pipe
The Genesys Cloud server terminated the connection. This typically happens when the client exceeds the idle timeout or sends malformed frames. Implement the ping/pong keepalive routine shown in Step 1. Monitor the connected flag before every write operation.
Error: Payload Size Exceeds 10240 Byte Limit
Webchat clients truncate or reject oversized frames. The validator in Step 2 enforces this limit. Reduce card descriptions, remove unused image URLs, or split complex payloads into multiple sequential messages. Each message must have a unique messageId and incrementing seq.
Error: Schema Validation Failed: dive error
The dive validator tag iterates over slices. If a button or card struct contains invalid action types or exceeds field length constraints, transmission halts. Verify that Card.Type matches info or action, and Button.Action matches url or postback. Ensure Button.Type is postback or submit.
Error: Sequence Number Collision
Concurrent callers must share the same atomic counter. If you instantiate multiple WebchatSender instances over the same WebchatSession, sequence numbers will duplicate. Share a single session instance across all sender routines and rely on the mutex-protected write path.