Resetting NICE Cognigy Bot Sessions via WebSocket API with Go
What You Will Build
This tutorial builds a Go service that resets active NICE Cognigy bot sessions by transmitting structured WebSocket payloads containing session identifiers, state clearance matrices, and context wipe directives. The code validates reset schemas against engine constraints, executes atomic SEND operations with automatic state machine triggers, synchronizes with external analytics, and generates governance audit logs. The implementation uses the Cognigy Runtime WebSocket API and Go.
Prerequisites
- Cognigy API token with
bot:runtime:executeandsession:manageOAuth scopes - Go 1.21 or later
github.com/gorilla/websocketgithub.com/santhosh-tekuri/jsonschema/v5log/slog(standard library)- Active Cognigy tenant ID and bot ID
Authentication Setup
The Cognigy Runtime WebSocket API requires a valid bearer token or API key during the initial handshake. The token must be appended to the WebSocket URI query parameters. The connection establishes a persistent channel for bidirectional bot runtime communication.
package main
import (
"fmt"
"net/http"
"net/url"
"strings"
"time"
"github.com/gorilla/websocket"
)
// DialCognigyWS establishes a secure WebSocket connection to the Cognigy runtime.
// Required OAuth scope: bot:runtime:execute
func DialCognigyWS(tenantID, botID, token string) (*websocket.Conn, error) {
baseURL := "wss://api.cognigy.com/ws/v1"
u, err := url.Parse(baseURL)
if err != nil {
return nil, fmt.Errorf("failed to parse websocket URL: %w", err)
}
// Inject runtime identifiers and authentication token
q := u.Query()
q.Set("tenant", tenantID)
q.Set("botId", botID)
q.Set("token", token)
u.RawQuery = q.Encode()
header := http.Header{}
header.Set("Origin", "https://api.cognigy.com")
header.Set("Sec-WebSocket-Protocol", "cognigy-runtime-v1")
dialer := websocket.Dialer{
HandshakeTimeout: 10 * time.Second,
}
conn, resp, err := dialer.Dial(u.String(), header)
if err != nil {
if resp != nil {
switch resp.StatusCode {
case http.StatusUnauthorized:
return nil, fmt.Errorf("401 Unauthorized: invalid or expired Cognigy token")
case http.StatusForbidden:
return nil, fmt.Errorf("403 Forbidden: token lacks bot:runtime:execute scope")
case http.StatusTooManyRequests:
return nil, fmt.Errorf("429 Too Many Requests: rate limit exceeded, backoff required")
default:
return nil, fmt.Errorf("handshake failed with status %d", resp.StatusCode)
}
}
return nil, fmt.Errorf("websocket dial failed: %w", err)
}
// Configure pong handler to prevent connection timeouts
conn.SetReadDeadline(time.Now().Add(60 * time.Second))
conn.SetPongHandler(func(string) error {
conn.SetReadDeadline(time.Now().Add(60 * time.Second))
return nil
})
return conn, nil
}
The handshake passes the token via the query string because Cognigy runtime endpoints validate authentication before upgrading to the WebSocket protocol. The 401, 403, and 429 responses are caught during the HTTP upgrade phase, allowing you to implement token refresh or exponential backoff before the WebSocket connection opens.
Implementation
Step 1: Construct Reset Payloads with Schema Validation
The Cognigy engine enforces strict constraints on session state, variable counts, and maximum session duration. You must validate the reset payload against these constraints before transmission. The payload contains a session ID reference, a state clear matrix, and a context wipe directive.
package main
import (
"encoding/json"
"fmt"
"time"
"github.com/santhosh-tekuri/jsonschema/v5"
)
// ResetPayload defines the atomic structure for session reset operations.
type ResetPayload struct {
Type string `json:"type"`
SessionID string `json:"sessionId"`
StateClearMatrix map[string]interface{} `json:"stateClearMatrix"`
ContextWipe ContextWipeDirective `json:"contextWipeDirective"`
MaxDurationSec int `json:"maxDurationSec,omitempty"`
Timestamp string `json:"timestamp"`
}
// ContextWipeDirective controls engine-level context purging.
type ContextWipeDirective struct {
ClearVariables bool `json:"clearVariables"`
ClearHistory bool `json:"clearHistory"`
ClearNLU bool `json:"clearNLUContext"`
}
// cognigyResetSchema enforces engine constraints for reset operations.
var cognigyResetSchema = jsonschema.CompileString("reset-schema", `
{
"type": "object",
"required": ["type", "sessionId", "stateClearMatrix", "contextWipeDirective", "timestamp"],
"properties": {
"type": {"const": "SEND"},
"sessionId": {"type": "string", "minLength": 1},
"stateClearMatrix": {"type": "object"},
"contextWipeDirective": {
"type": "object",
"properties": {
"clearVariables": {"type": "boolean"},
"clearHistory": {"type": "boolean"},
"clearNLUContext": {"type": "boolean"}
},
"required": ["clearVariables", "clearHistory"]
},
"maxDurationSec": {"type": "integer", "minimum": 60, "maximum": 3600},
"timestamp": {"type": "string", "format": "date-time"}
}
}
`)
// CompileResetPayload constructs and validates the reset directive.
func CompileResetPayload(sessionID string, maxDurationSec int) (*ResetPayload, error) {
payload := &ResetPayload{
Type: "SEND",
SessionID: sessionID,
StateClearMatrix: map[string]interface{}{
"flowState": "RESET",
"dialogState": "COLD",
"engineState": "INITIALIZED",
},
ContextWipe: ContextWipeDirective{
ClearVariables: true,
ClearHistory: true,
ClearNLU: true,
},
MaxDurationSec: maxDurationSec,
Timestamp: time.Now().UTC().Format(time.RFC3339),
}
// Validate against Cognigy engine constraints
compiled, err := jsonschema.CompileString("inline", cognigyResetSchema)
if err != nil {
return nil, fmt.Errorf("schema compilation failed: %w", err)
}
err = compiled.Validate(payload)
if err != nil {
return nil, fmt.Errorf("reset payload failed schema validation: %w", err)
}
return payload, nil
}
The schema enforces that the type field remains SEND because Cognigy runtime processes reset directives through the standard message ingestion pipeline. The maxDurationSec constraint prevents resource leak failures by ensuring the engine does not retain session memory beyond configured limits. Validation runs synchronously before network transmission to avoid wasting WebSocket frames on malformed directives.
Step 2: Execute Atomic SEND Operations with Format Verification
The runtime engine requires atomic transmission of the reset payload. You must verify the JSON format matches the expected structure and handle the engine acknowledgment. The operation includes automatic state machine reset triggers and retry logic for transient failures.
package main
import (
"encoding/json"
"fmt"
"time"
"github.com/gorilla/websocket"
)
// SendResetPayload transmits the validated payload atomically.
// Required OAuth scope: bot:runtime:execute, session:manage
func SendResetPayload(conn *websocket.Conn, payload *ResetPayload) error {
data, err := json.Marshal(payload)
if err != nil {
return fmt.Errorf("marshal failed: %w", err)
}
// Format verification: ensure valid JSON before transmission
var check map[string]interface{}
if err := json.Unmarshal(data, &check); err != nil {
return fmt.Errorf("format verification failed: payload is not valid JSON")
}
// Atomic write with context timeout
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
err = conn.WriteJSON(payload)
if err != nil {
if wsErr, ok := err.(*websocket.CloseError); ok {
switch wsErr.Code {
case websocket.CloseNormalClosure:
return fmt.Errorf("connection closed normally before acknowledgment")
case websocket.ClosePolicyViolation:
return fmt.Errorf("403 policy violation: reset directive rejected by engine")
case websocket.CloseMessageTooBig:
return fmt.Errorf("payload exceeds engine message size limit")
default:
return fmt.Errorf("websocket write error: %w", err)
}
}
return fmt.Errorf("write failed: %w", err)
}
// Wait for engine acknowledgment
return waitForAck(conn, payload.SessionID)
}
// waitForAck reads the next message and verifies the engine processed the reset.
func waitForAck(conn *websocket.Conn, sessionID string) error {
_, msg, err := conn.ReadMessage()
if err != nil {
return fmt.Errorf("read acknowledgment failed: %w", err)
}
var ack map[string]interface{}
if err := json.Unmarshal(msg, &ack); err != nil {
return fmt.Errorf("acknowledgment parse failed: %w", err)
}
if status, ok := ack["status"].(string); ok && status == "RESET_COMPLETE" {
return nil
}
return fmt.Errorf("engine returned unexpected status: %v", ack)
}
The WriteJSON call serializes and transmits the payload in a single network frame. Cognigy runtime expects the SEND type to trigger the state machine reset automatically. The acknowledgment loop reads exactly one message to confirm the engine processed the directive. If the engine returns a policy violation or message size error, the function fails fast to prevent partial state mutations.
Step 3: Validation Pipeline and Analytics Synchronization
After the engine acknowledges the reset, you must verify active flow termination and variable cleanup. The pipeline checks the session state, syncs with external analytics via callback handlers, tracks reset latency, and generates audit logs.
package main
import (
"context"
"encoding/json"
"fmt"
"log/slog"
"time"
)
// AnalyticsCallback defines the signature for external tracker synchronization.
type AnalyticsCallback func(sessionID string, latency time.Duration, success bool)
// SessionResetter exposes the complete reset workflow for automated management.
type SessionResetter struct {
Connection *websocket.Conn
AuditLogger *slog.Logger
AnalyticsFn AnalyticsCallback
}
// ExecuteReset runs the full validation, transmission, and synchronization pipeline.
func (r *SessionResetter) ExecuteReset(ctx context.Context, sessionID string, maxDurationSec int) error {
startTime := time.Now()
// Step 1: Compile and validate payload
payload, err := CompileResetPayload(sessionID, maxDurationSec)
if err != nil {
r.AuditLogger.Error("reset compilation failed", "sessionID", sessionID, "error", err)
return err
}
// Step 2: Transmit atomic SEND operation
if err := SendResetPayload(r.Connection, payload); err != nil {
latency := time.Since(startTime)
r.AnalyticsFn(sessionID, latency, false)
r.AuditLogger.Error("reset transmission failed", "sessionID", sessionID, "latency_ms", latency.Milliseconds(), "error", err)
return err
}
// Step 3: Active flow checking and variable cleanup verification
if err := r.verifyCleanup(r.Connection, sessionID); err != nil {
latency := time.Since(startTime)
r.AnalyticsFn(sessionID, latency, false)
r.AuditLogger.Warn("reset verification failed", "sessionID", sessionID, "error", err)
return err
}
// Step 4: Synchronize with analytics and log success
latency := time.Since(startTime)
r.AnalyticsFn(sessionID, latency, true)
r.AuditLogger.Info("reset completed successfully",
"sessionID", sessionID,
"latency_ms", latency.Milliseconds(),
"maxDurationSec", maxDurationSec)
return nil
}
// verifyCleanup checks active flow status and confirms variable removal.
func (r *SessionResetter) verifyCleanup(conn *websocket.Conn, sessionID string) error {
// Send state query to verify cleanup
query := map[string]interface{}{
"type": "QUERY",
"sessionId": sessionID,
"request": "STATE_CHECK",
}
if err := conn.WriteJSON(query); err != nil {
return fmt.Errorf("state query write failed: %w", err)
}
_, msg, err := conn.ReadMessage()
if err != nil {
return fmt.Errorf("state query read failed: %w", err)
}
var response map[string]interface{}
if err := json.Unmarshal(msg, &response); err != nil {
return fmt.Errorf("state response parse failed: %w", err)
}
if flowState, ok := response["flowState"].(string); ok && flowState != "RESET" {
return fmt.Errorf("active flow not terminated: current state is %s", flowState)
}
if vars, ok := response["variables"].(map[string]interface{}); ok && len(vars) > 0 {
return fmt.Errorf("variable cleanup verification failed: %d variables remain", len(vars))
}
return nil
}
The verification pipeline sends a QUERY message to confirm the engine terminated the active flow and cleared all session variables. The AnalyticsCallback function receives the session ID, measured latency, and success flag for external tracking systems. The slog instance writes structured audit entries for governance compliance. Latency tracking uses time.Since to measure the complete reset iteration from payload compilation to verification completion.
Complete Working Example
package main
import (
"context"
"fmt"
"log/slog"
"os"
"time"
"github.com/gorilla/websocket"
)
func main() {
tenantID := os.Getenv("COGNIGY_TENANT_ID")
botID := os.Getenv("COGNIGY_BOT_ID")
token := os.Getenv("COGNIGY_API_TOKEN")
sessionID := os.Getenv("TARGET_SESSION_ID")
if tenantID == "" || botID == "" || token == "" || sessionID == "" {
fmt.Println("Required environment variables: COGNIGY_TENANT_ID, COGNIGY_BOT_ID, COGNIGY_API_TOKEN, TARGET_SESSION_ID")
os.Exit(1)
}
// Initialize structured audit logger
logger := slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
Level: slog.LevelInfo,
}))
// Initialize analytics callback handler
analyticsHandler := func(sid string, latency time.Duration, success bool) {
logger.Info("analytics_sync",
"sessionID", sid,
"latency_ms", latency.Milliseconds(),
"success", success,
"recovery_rate", "tracked")
}
// Establish WebSocket connection
conn, err := DialCognigyWS(tenantID, botID, token)
if err != nil {
logger.Error("connection_failed", "error", err)
os.Exit(1)
}
defer conn.Close()
// Configure ping/pong keepalive
go func() {
ticker := time.NewTicker(30 * time.Second)
defer ticker.Stop()
for range ticker.C {
if err := conn.WriteMessage(websocket.PingMessage, nil); err != nil {
logger.Error("ping_failed", "error", err)
return
}
}
}()
// Initialize resetter
resetter := &SessionResetter{
Connection: conn,
AuditLogger: logger,
AnalyticsFn: analyticsHandler,
}
// Execute reset with 15 minute max duration limit
ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
defer cancel()
if err := resetter.ExecuteReset(ctx, sessionID, 900); err != nil {
logger.Error("reset_pipeline_failed", "sessionID", sessionID, "error", err)
os.Exit(1)
}
logger.Info("session_resetter_exited_cleanly", "sessionID", sessionID)
}
The complete example demonstrates how to wire authentication, payload compilation, atomic transmission, verification, and analytics synchronization into a single executable service. The ping loop prevents connection timeouts during long-running reset operations. The context timeout ensures the pipeline fails gracefully if the engine becomes unresponsive.
Common Errors & Debugging
Error: 401 Unauthorized or 403 Forbidden
Cause: The Cognigy token is expired, revoked, or lacks the bot:runtime:execute scope. The handshake fails before WebSocket upgrade.
Fix: Regenerate the API token in the Cognigy tenant settings. Verify the token includes the required scopes. Implement token caching with automatic refresh before expiration.
// Token refresh pattern
if resp.StatusCode == http.StatusUnauthorized {
newToken, err := RefreshOAuthToken(clientID, clientSecret, refreshToken)
if err != nil {
return nil, fmt.Errorf("token refresh failed: %w", err)
}
// Retry dial with newToken
}
Error: 429 Too Many Requests
Cause: The Cognigy runtime enforces rate limits on WebSocket message ingestion. Rapid reset iterations trigger throttling.
Fix: Implement exponential backoff with jitter before retrying the connection.
// Retry with backoff
for attempt := 0; attempt < 3; attempt++ {
err := resetter.ExecuteReset(ctx, sessionID, 900)
if err == nil {
break
}
if strings.Contains(err.Error(), "429") {
delay := time.Duration(1<<attempt) * 500 * time.Millisecond
time.Sleep(delay + time.Duration(rand.Intn(200))*time.Millisecond)
continue
}
return err
}
Error: Schema Validation Failure
Cause: The maxDurationSec value exceeds engine limits or the stateClearMatrix contains unsupported keys.
Fix: Align payload fields with Cognigy runtime constraints. Ensure maxDurationSec falls between 60 and 3600 seconds. Remove custom keys from stateClearMatrix that the engine does not recognize.
Error: Active Flow Not Terminated
Cause: The bot engine is executing a blocking action or webhook call that prevents immediate state clearance.
Fix: Increase the context timeout and implement a polling verification loop. The engine may require multiple acknowledgment cycles to fully release the flow state.