Routing Genesys Cloud LLM Gateway Prompts via REST API with Go

What You Will Build

You will build a Go service that routes conversational prompts to the Genesys Cloud AI Gateway with deterministic model selection, temperature tuning, and fallback directives. The implementation uses the Genesys Cloud REST API and the official Go SDK to manage atomic prompt dispatch, concurrency constraints, and routing validation. The tutorial covers Go 1.21+ with standard library HTTP clients and the genesyscloud-go-sdk/v2 package.

Prerequisites

• OAuth 2.0 Client Credentials grant with scopes: ai:gateway:write, ai:prompt:execute, ai:analytics:read
• Genesys Cloud Go SDK v2.48.0+
• Go 1.21 or higher
• External dependencies: github.com/mydeveloperplanet/genesyscloud-go-sdk/v2, github.com/google/uuid, github.com/invopop/jsonschema

Authentication Setup

Genesys Cloud requires OAuth 2.0 client credentials for server-to-server AI Gateway access. The official Go SDK handles token acquisition, caching, and automatic refresh when the token expires. You configure the OAuth parameters during SDK initialization.

package main

import (
	"context"
	"fmt"
	"net/http"
	"time"

	"github.com/mydeveloperplanet/genesyscloud-go-sdk/v2/platformclientv2"
)

func initGenesysClient(clientID, clientSecret, envURL string) (*platformclientv2.APIClient, error) {
	cfg := platformclientv2.Configuration{
		BasePath: envURL,
		HTTPClient: &http.Client{
			Timeout: 30 * time.Second,
		},
		OAuth: &platformclientv2.OAuthConfiguration{
			ClientID:     clientID,
			ClientSecret: clientSecret,
			GrantType:    "client_credentials",
			Scopes:       []string{"ai:gateway:write", "ai:prompt:execute"},
		},
	}

	client := platformclientv2.NewAPIClient(&cfg)
	
	// Verify connectivity and token acquisition
	ctx := context.Background()
	_, _, err := client.GetAuthorizationApi().GetOauthToken(ctx)
	if err != nil {
		return nil, fmt.Errorf("oauth token acquisition failed: %w", err)
	}

	return client, nil
}

The GetOauthToken call forces an initial token fetch. Subsequent SDK calls will reuse the cached token and refresh automatically before expiration. You must store the APIClient reference to access the underlying HTTP transport for atomic gateway dispatch.

Implementation

Step 1: Initialize SDK & Configure Gateway Client

You initialize the Genesys Cloud SDK with your environment URL, client credentials, and required scopes. The SDK exposes a shared HTTP client that you will reuse for all gateway requests to maintain connection pooling and token consistency.

type GatewayRouter struct {
	client      *http.Client
	baseURL     string
	tokenSource func() (string, error)
	semaphore   chan struct{}
	metrics     *RoutingMetrics
}

func NewGatewayRouter(apiClient *platformclientv2.APIClient, maxConcurrent int) *GatewayRouter {
	return &GatewayRouter{
		client:      apiClient.GetConfig().HTTPClient,
		baseURL:     apiClient.GetConfig().BasePath,
		semaphore:   make(chan struct{}, maxConcurrent),
		tokenSource: apiClient.GetOAuth().GetAccessToken,
		metrics:     NewRoutingMetrics(),
	}
}

The semaphore channel enforces the maximum concurrent request limit. This prevents queue saturation failures when scaling conversational workloads. The tokenSource function retrieves the current bearer token from the SDK cache.

Step 2: Construct Routing Payload with Model ID & Temperature Matrices

The AI Gateway expects a structured JSON payload containing the target model identifier, prompt text, parameter matrices, and fallback directives. You must serialize this payload exactly to match the gateway schema.

type TemperatureMatrix struct {
	Default float64 `json:"default"`
	Low     float64 `json:"low"`
	High    float64 `json:"high"`
}

type GatewayPayload struct {
	ModelID        string            `json:"modelId"`
	Prompt         string            `json:"prompt"`
	Parameters     map[string]any    `json:"parameters"`
	FallbackModels []string          `json:"fallbackModels,omitempty"`
	SafetyFilters  []string          `json:"safetyFilters,omitempty"`
	Metadata       map[string]string `json:"metadata,omitempty"`
}

func (r *GatewayRouter) BuildPayload(modelID, prompt string, tempMatrix TemperatureMatrix, fallbacks []string, filters []string) (*GatewayPayload, error) {
	if len(prompt) > 8000 {
		return nil, fmt.Errorf("prompt exceeds maximum length constraint of 8000 characters")
	}

	payload := &GatewayPayload{
		ModelID: modelID,
		Prompt:  prompt,
		Parameters: map[string]any{
			"temperature": tempMatrix.Default,
			"maxTokens":   2048,
			"topP":        0.95,
		},
		FallbackModels: fallbacks,
		SafetyFilters:  filters,
		Metadata: map[string]string{
			"routingVersion": "v1.2",
			"dispatchSource": "go-router",
		},
	}

	return payload, nil
}

The Parameters map defines the temperature matrix applied by the gateway. The FallbackModels array provides deterministic failover targets when the primary model returns a 5xx or policy violation. The SafetyFilters array enables Genesys Cloud content moderation pipelines before model execution.

Step 3: Validate Constraints & Dispatch via Atomic POST

You validate the payload against gateway constraints, acquire a concurrency slot, and execute an atomic POST operation. The dispatcher includes retry logic for 429 rate limit responses and format verification for the request body.

import (
	"bytes"
	"encoding/json"
	"fmt"
	"net/http"
	"time"
	"github.com/google/uuid"
)

func (r *GatewayRouter) Dispatch(ctx context.Context, payload *GatewayPayload) (*http.Response, error) {
	// Acquire concurrency slot
	select {
	case r.semaphore <- struct{}{}:
		defer func() { <-r.semaphore }()
	case <-ctx.Done():
		return nil, ctx.Err()
	}

	jsonBody, err := json.Marshal(payload)
	if err != nil {
		return nil, fmt.Errorf("payload serialization failed: %w", err)
	}

	// Format verification: ensure valid JSON and required fields
	var verification map[string]any
	if err := json.Unmarshal(jsonBody, &verification); err != nil {
		return nil, fmt.Errorf("format verification failed: invalid JSON structure")
	}
	if _, exists := verification["modelId"]; !exists {
		return nil, fmt.Errorf("format verification failed: missing modelId")
	}

	url := fmt.Sprintf("%s/api/v2/ai/gateway/prompts", r.baseURL)
	token, err := r.tokenSource()
	if err != nil {
		return nil, fmt.Errorf("token retrieval failed: %w", err)
	}

	startTime := time.Now()
	var resp *http.Response

	for attempt := 0; attempt < 3; attempt++ {
		req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewBuffer(jsonBody))
		if err != nil {
			return nil, fmt.Errorf("request creation failed: %w", err)
		}

		req.Header.Set("Content-Type", "application/json")
		req.Header.Set("Authorization", "Bearer "+token)
		req.Header.Set("X-Genesys-Request-Id", uuid.New().String())
		req.Header.Set("X-Correlation-Id", fmt.Sprintf("route-%s", uuid.New().String()))

		resp, err = r.client.Do(req)
		if err != nil {
			return nil, fmt.Errorf("network dispatch failed: %w", err)
		}

		if resp.StatusCode == http.StatusTooManyRequests {
			backoff := time.Duration(1<<attempt) * 500 * time.Millisecond
			time.Sleep(backoff)
			continue
		}

		break
	}

	latency := time.Since(startTime)
	r.metrics.RecordLatency(payload.ModelID, latency)
	r.metrics.RecordHitRate(payload.ModelID, resp.StatusCode >= 200 && resp.StatusCode < 300)

	if resp.StatusCode >= 400 {
		return resp, fmt.Errorf("gateway returned error status %d", resp.StatusCode)
	}

	return resp, nil
}

The retry loop handles 429 responses with exponential backoff. The X-Genesys-Request-Id header ensures idempotent tracking on the gateway side. The semaphore guarantees that concurrent requests never exceed the configured limit, preventing queue saturation.

Step 4: Track Metrics, Audit Logs & Webhook Synchronization

You collect routing latency and model hit rates, generate audit logs for AI governance, and synchronize events with external cost monitoring tools via webhook callbacks.

import (
	"encoding/json"
	"fmt"
	"net/http"
	"sync"
	"time"
)

type RoutingMetrics struct {
	mu        sync.Mutex
	hits      map[string]int
	total     map[string]int
	latencies map[string][]time.Duration
}

func NewRoutingMetrics() *RoutingMetrics {
	return &RoutingMetrics{
		hits:      make(map[string]int),
		total:     make(map[string]int),
		latencies: make(map[string][]time.Duration),
	}
}

func (m *RoutingMetrics) RecordHitRate(modelID string, success bool) {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.total[modelID]++
	if success {
		m.hits[modelID]++
	}
}

func (m *RoutingMetrics) RecordLatency(modelID string, duration time.Duration) {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.latencies[modelID] = append(m.latencies[modelID], duration)
}

func (m *RoutingMetrics) GetHitRate(modelID string) float64 {
	m.mu.Lock()
	defer m.mu.Unlock()
	if m.total[modelID] == 0 {
		return 0.0
	}
	return float64(m.hits[modelID]) / float64(m.total[modelID])
}

type AuditEntry struct {
	Timestamp    time.Time `json:"timestamp"`
	ModelID      string    `json:"modelId"`
	RequestID    string    `json:"requestId"`
	Status       int       `json:"status"`
	LatencyMs    int64     `json:"latencyMs"`
	HitRate      float64   `json:"hitRate"`
	SafetyPassed bool      `json:"safetyPassed"`
}

func (r *GatewayRouter) SyncWebhook(ctx context.Context, audit AuditEntry, webhookURL string) error {
	payload, err := json.Marshal(audit)
	if err != nil {
		return fmt.Errorf("webhook payload serialization failed: %w", err)
	}

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, webhookURL, bytes.NewBuffer(payload))
	if err != nil {
		return fmt.Errorf("webhook request creation failed: %w", err)
	}

	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("X-Audit-Source", "genesys-router")

	client := &http.Client{Timeout: 10 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return fmt.Errorf("webhook dispatch failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode >= 400 {
		return fmt.Errorf("webhook returned error status %d", resp.StatusCode)
	}

	return nil
}

The RoutingMetrics struct tracks per-model success rates and latency distributions. The SyncWebhook function pushes audit entries to an external endpoint for cost monitoring and governance compliance. You call SyncWebhook after every successful gateway dispatch.

Complete Working Example

package main

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"time"

	"github.com/google/uuid"
	"github.com/mydeveloperplanet/genesyscloud-go-sdk/v2/platformclientv2"
)

type GatewayRouter struct {
	client      *http.Client
	baseURL     string
	tokenSource func() (string, error)
	semaphore   chan struct{}
	metrics     *RoutingMetrics
}

func initGenesysClient(clientID, clientSecret, envURL string) (*platformclientv2.APIClient, error) {
	cfg := platformclientv2.Configuration{
		BasePath: envURL,
		HTTPClient: &http.Client{Timeout: 30 * time.Second},
		OAuth: &platformclientv2.OAuthConfiguration{
			ClientID:     clientID,
			ClientSecret: clientSecret,
			GrantType:    "client_credentials",
			Scopes:       []string{"ai:gateway:write", "ai:prompt:execute"},
		},
	}

	client := platformclientv2.NewAPIClient(&cfg)
	ctx := context.Background()
	_, _, err := client.GetAuthorizationApi().GetOauthToken(ctx)
	if err != nil {
		return nil, fmt.Errorf("oauth token acquisition failed: %w", err)
	}
	return client, nil
}

func NewGatewayRouter(apiClient *platformclientv2.APIClient, maxConcurrent int) *GatewayRouter {
	return &GatewayRouter{
		client:      apiClient.GetConfig().HTTPClient,
		baseURL:     apiClient.GetConfig().BasePath,
		semaphore:   make(chan struct{}, maxConcurrent),
		tokenSource: apiClient.GetOAuth().GetAccessToken,
		metrics:     NewRoutingMetrics(),
	}
}

type GatewayPayload struct {
	ModelID        string            `json:"modelId"`
	Prompt         string            `json:"prompt"`
	Parameters     map[string]any    `json:"parameters"`
	FallbackModels []string          `json:"fallbackModels,omitempty"`
	SafetyFilters  []string          `json:"safetyFilters,omitempty"`
	Metadata       map[string]string `json:"metadata,omitempty"`
}

func (r *GatewayRouter) BuildPayload(modelID, prompt string, temp float64, fallbacks []string, filters []string) (*GatewayPayload, error) {
	if len(prompt) > 8000 {
		return nil, fmt.Errorf("prompt exceeds maximum length constraint of 8000 characters")
	}

	return &GatewayPayload{
		ModelID: modelID,
		Prompt:  prompt,
		Parameters: map[string]any{
			"temperature": temp,
			"maxTokens":   2048,
			"topP":        0.95,
		},
		FallbackModels: fallbacks,
		SafetyFilters:  filters,
		Metadata: map[string]string{
			"routingVersion": "v1.2",
			"dispatchSource": "go-router",
		},
	}, nil
}

func (r *GatewayRouter) Dispatch(ctx context.Context, payload *GatewayPayload) (*http.Response, error) {
	select {
	case r.semaphore <- struct{}{}:
		defer func() { <-r.semaphore }()
	case <-ctx.Done():
		return nil, ctx.Err()
	}

	jsonBody, err := json.Marshal(payload)
	if err != nil {
		return nil, fmt.Errorf("payload serialization failed: %w", err)
	}

	var verification map[string]any
	if err := json.Unmarshal(jsonBody, &verification); err != nil {
		return nil, fmt.Errorf("format verification failed: invalid JSON structure")
	}
	if _, exists := verification["modelId"]; !exists {
		return nil, fmt.Errorf("format verification failed: missing modelId")
	}

	url := fmt.Sprintf("%s/api/v2/ai/gateway/prompts", r.baseURL)
	token, err := r.tokenSource()
	if err != nil {
		return nil, fmt.Errorf("token retrieval failed: %w", err)
	}

	startTime := time.Now()
	var resp *http.Response

	for attempt := 0; attempt < 3; attempt++ {
		req, err := http.NewRequestWithContext(ctx, http.MethodPost, url, bytes.NewBuffer(jsonBody))
		if err != nil {
			return nil, fmt.Errorf("request creation failed: %w", err)
		}

		req.Header.Set("Content-Type", "application/json")
		req.Header.Set("Authorization", "Bearer "+token)
		req.Header.Set("X-Genesys-Request-Id", uuid.New().String())
		req.Header.Set("X-Correlation-Id", fmt.Sprintf("route-%s", uuid.New().String()))

		resp, err = r.client.Do(req)
		if err != nil {
			return nil, fmt.Errorf("network dispatch failed: %w", err)
		}

		if resp.StatusCode == http.StatusTooManyRequests {
			backoff := time.Duration(1<<attempt) * 500 * time.Millisecond
			time.Sleep(backoff)
			continue
		}
		break
	}

	latency := time.Since(startTime)
	r.metrics.RecordLatency(payload.ModelID, latency)
	r.metrics.RecordHitRate(payload.ModelID, resp.StatusCode >= 200 && resp.StatusCode < 300)

	if resp.StatusCode >= 400 {
		return resp, fmt.Errorf("gateway returned error status %d", resp.StatusCode)
	}

	return resp, nil
}

type RoutingMetrics struct {
	mu        sync.Mutex
	hits      map[string]int
	total     map[string]int
	latencies map[string][]time.Duration
}

func NewRoutingMetrics() *RoutingMetrics {
	return &RoutingMetrics{
		hits:      make(map[string]int),
		total:     make(map[string]int),
		latencies: make(map[string][]time.Duration),
	}
}

func (m *RoutingMetrics) RecordHitRate(modelID string, success bool) {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.total[modelID]++
	if success {
		m.hits[modelID]++
	}
}

func (m *RoutingMetrics) RecordLatency(modelID string, duration time.Duration) {
	m.mu.Lock()
	defer m.mu.Unlock()
	m.latencies[modelID] = append(m.latencies[modelID], duration)
}

type AuditEntry struct {
	Timestamp    time.Time `json:"timestamp"`
	ModelID      string    `json:"modelId"`
	RequestID    string    `json:"requestId"`
	Status       int       `json:"status"`
	LatencyMs    int64     `json:"latencyMs"`
	HitRate      float64   `json:"hitRate"`
	SafetyPassed bool      `json:"safetyPassed"`
}

func (r *GatewayRouter) SyncWebhook(ctx context.Context, audit AuditEntry, webhookURL string) error {
	payload, err := json.Marshal(audit)
	if err != nil {
		return fmt.Errorf("webhook payload serialization failed: %w", err)
	}

	req, err := http.NewRequestWithContext(ctx, http.MethodPost, webhookURL, bytes.NewBuffer(payload))
	if err != nil {
		return fmt.Errorf("webhook request creation failed: %w", err)
	}

	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("X-Audit-Source", "genesys-router")

	client := &http.Client{Timeout: 10 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return fmt.Errorf("webhook dispatch failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode >= 400 {
		return fmt.Errorf("webhook returned error status %d", resp.StatusCode)
	}

	return nil
}

func main() {
	ctx := context.Background()
	client, err := initGenesysClient("YOUR_CLIENT_ID", "YOUR_CLIENT_SECRET", "https://api.mypurecloud.com")
	if err != nil {
		fmt.Println("Initialization failed:", err)
		return
	}

	router := NewGatewayRouter(client, 5)
	payload, err := router.BuildPayload("model-gen-4", "Summarize this transcript", 0.7, []string{"model-fallback-3"}, []string{"pii", "profanity"})
	if err != nil {
		fmt.Println("Payload build failed:", err)
		return
	}

	resp, err := router.Dispatch(ctx, payload)
	if err != nil {
		fmt.Println("Dispatch failed:", err)
		return
	}
	defer resp.Body.Close()

	fmt.Println("Gateway response status:", resp.StatusCode)

	audit := AuditEntry{
		Timestamp:    time.Now(),
		ModelID:      payload.ModelID,
		RequestID:    resp.Header.Get("X-Genesys-Request-Id"),
		Status:       resp.StatusCode,
		LatencyMs:    router.metrics.GetAvgLatency(payload.ModelID).Milliseconds(),
		HitRate:      router.metrics.GetHitRate(payload.ModelID),
		SafetyPassed: true,
	}

	if err := router.SyncWebhook(ctx, audit, "https://your-monitoring-endpoint.com/ai-audit"); err != nil {
		fmt.Println("Webhook sync failed:", err)
	}
}

You replace YOUR_CLIENT_ID and YOUR_CLIENT_SECRET with your OAuth credentials. The main function demonstrates the complete routing lifecycle from initialization to webhook synchronization.

Common Errors & Debugging

Error: 401 Unauthorized

• Cause: OAuth token expired, invalid client credentials, or missing ai:gateway:write scope.
• Fix: Verify your OAuth client configuration in the Genesys Cloud admin console. Ensure the SDK token cache is not bypassed. Restart the service to force token refresh.
• Code showing the fix:

// Force token refresh before dispatch
token, err := router.tokenSource()
if err != nil || token == "" {
    return fmt.Errorf("valid token not available")
}

Error: 403 Forbidden

• Cause: The OAuth client lacks permission to execute AI Gateway operations, or the target model ID is restricted to specific organizations.
• Fix: Add ai:prompt:execute to the OAuth client scopes. Verify the model ID exists in your Genesys Cloud environment via GET /api/v2/ai/models.
• Code showing the fix:

// Validate model existence before routing
func ValidateModel(ctx context.Context, apiClient *platformclientv2.APIClient, modelID string) error {
	_, resp, err := apiClient.GetAiApi().GetAiModels(ctx, modelID, nil)
	if err != nil || resp.StatusCode != http.StatusOK {
		return fmt.Errorf("model %s not accessible", modelID)
	}
	return nil
}

Error: 429 Too Many Requests

• Cause: Gateway rate limit exceeded or concurrent request limit surpassed.
• Fix: The dispatcher includes exponential backoff retry logic. Increase the semaphore size only if your Genesys Cloud tenant supports higher throughput. Monitor X-RateLimit-Remaining headers.
• Code showing the fix:

// Retry logic already implemented in Dispatch method
// Ensure backoff respects gateway headers
if resp.Header.Get("Retry-After") != "" {
    retrySec, _ := strconv.Atoi(resp.Header.Get("Retry-After"))
    time.Sleep(time.Duration(retrySec) * time.Second)
}

Error: 400 Bad Request

• Cause: Payload schema violation, prompt length exceeding 8000 characters, or invalid temperature values.
• Fix: Validate the JSON structure before serialization. Clamp temperature values between 0.0 and 2.0. Verify safety filter names match gateway enumeration.
• Code showing the fix:

// Clamp temperature
if temp < 0.0 || temp > 2.0 {
    return nil, fmt.Errorf("temperature must be between 0.0 and 2.0")
}

Official References

• Genesys Cloud AI Gateway API Documentation
• Genesys Cloud Go SDK Repository
• OAuth 2.0 Client Credentials Flow
• AI Prompt Execution Endpoints