Retrieving Genesys Cloud Media Recordings via Go HTTP Client with Range Requests and Rate Limit Resilience

What You Will Build

• A production-grade Go module that downloads Genesys Cloud conversation recordings using atomic GET operations with range request headers and chunked transfer streaming.
• The implementation uses the Genesys Cloud REST Media API surface directly through net/http to bypass SDK abstraction layers and enforce precise control over byte ranges, retry logic, and storage triggers.
• The tutorial covers Go 1.21+ with standard library dependencies only, ensuring zero external package friction for enterprise deployment.

Prerequisites

• OAuth 2.0 Client Credentials grant type with recording:view and recording:download scopes
• Genesys Cloud API v2 endpoints (no SDK required)
• Go 1.21 or higher installed and configured
• Access to a writable local directory or mounted object storage path for chunked file assembly
• Network egress rules permitting HTTPS traffic to api.mypurecloud.com and media.mypurecloud.com

Authentication Setup

Genesys Cloud enforces token expiration at a fixed interval. The client credentials flow returns an expires_in value that dictates cache validity. The following function implements token acquisition, TTL validation, and automatic refresh to prevent 401 mid-stream failures during long-running archival jobs.

package main

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

type OAuthConfig struct {
	Environment string
	ClientID    string
	ClientSecret string
}

type TokenResponse struct {
	AccessToken string `json:"access_token"`
	ExpiresIn   int    `json:"expires_in"`
}

type TokenCache struct {
	mu          sync.RWMutex
	token       string
	expiresAt   time.Time
}

func (c *TokenCache) Get() (string, bool) {
	c.mu.RLock()
	defer c.mu.RUnlock()
	return c.token, time.Now().Before(c.expiresAt)
}

func (c *TokenCache) Set(token string, expiresIn int) {
	c.mu.Lock()
	defer c.mu.Unlock()
	c.token = token
	c.expiresAt = time.Now().Add(time.Duration(expiresIn) * time.Second)
}

func FetchToken(cfg OAuthConfig, cache *TokenCache) (string, error) {
	if tok, valid := cache.Get(); valid {
		return tok, nil
	}

	form := url.Values{}
	form.Set("grant_type", "client_credentials")
	form.Set("client_id", cfg.ClientID)
	form.Set("client_secret", cfg.ClientSecret)
	form.Set("scope", "recording:view recording:download")

	req, err := http.NewRequest(http.MethodPost, fmt.Sprintf("https://%s.mypurecloud.com/api/v2/oauth/token", cfg.Environment), strings.NewReader(form.Encode()))
	if err != nil {
		return "", fmt.Errorf("failed to construct oauth request: %w", err)
	}
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

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

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return "", fmt.Errorf("oauth token error %d: %s", resp.StatusCode, string(body))
	}

	var tokenResp TokenResponse
	if err := json.NewDecoder(resp.Body).Decode(&tokenResp); err != nil {
		return "", fmt.Errorf("failed to decode token response: %w", err)
	}

	cache.Set(tokenResp.AccessToken, tokenResp.ExpiresIn)
	return tokenResp.AccessToken, nil
}

The cache prevents redundant POST requests to the authorization server. Every subsequent API call checks the TTL before issuing a refresh. This pattern eliminates token rotation race conditions during batch retrieval loops.

Implementation

Step 1: Metadata Validation and Access Control Pipeline

Before initiating a download, the system must verify recording availability, retention status, and format compatibility. The /api/v2/recordings/{recordingId} endpoint returns a schema that dictates whether the media engine can serve the payload. The following function enforces a format matrix and retention rules.

type RecordingMetadata struct {
	ID       string `json:"id"`
	Status   string `json:"status"`
	Archived bool   `json:"archived"`
	Format   string `json:"format"`
	MediaURL string `json:"media_url"`
}

type FormatMatrix struct {
	Extension string
	MIMEType  string
}

var AllowedFormats = map[string]FormatMatrix{
	"wav":  {Extension: ".wav", MIMEType: "audio/wav"},
	"mp3":  {Extension: ".mp3", MIMEType: "audio/mpeg"},
	"wav49": {Extension: ".wav", MIMEType: "audio/wav"},
	"wav32": {Extension: ".wav", MIMEType: "audio/wav"},
	"mp4":  {Extension: ".mp4", MIMEType: "video/mp4"},
	"webm": {Extension: ".webm", MIMEType: "video/webm"},
}

func ValidateRecording(cfg OAuthConfig, cache *TokenCache, recordingID string) (*RecordingMetadata, error) {
	token, err := FetchToken(cfg, cache)
	if err != nil {
		return nil, fmt.Errorf("token acquisition failed: %w", err)
	}

	req, err := http.NewRequest(http.MethodGet, fmt.Sprintf("https://%s.mypurecloud.com/api/v2/recordings/%s", cfg.Environment, recordingID), nil)
	if err != nil {
		return nil, fmt.Errorf("metadata request construction failed: %w", err)
	}
	req.Header.Set("Authorization", "Bearer "+token)

	client := &http.Client{Timeout: 15 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return nil, fmt.Errorf("metadata fetch failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode == http.StatusUnauthorized || resp.StatusCode == http.StatusForbidden {
		return nil, fmt.Errorf("access control violation: status %d. Verify recording:view scope", resp.StatusCode)
	}
	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("metadata retrieval failed with status %d", resp.StatusCode)
	}

	var meta RecordingMetadata
	if err := json.NewDecoder(resp.Body).Decode(&meta); err != nil {
		return nil, fmt.Errorf("metadata schema decode failed: %w", err)
	}

	if meta.Status != "available" && meta.Status != "archived" {
		return nil, fmt.Errorf("retention check failed: recording status is %s", meta.Status)
	}
	if _, exists := AllowedFormats[meta.Format]; !exists {
		return nil, fmt.Errorf("format matrix violation: unsupported format %s", meta.Format)
	}

	return &meta, nil
}

The validation pipeline rejects recordings in deleting, processing, or error states. It also enforces the format matrix to prevent downstream transcoder failures. The recording:view scope is required for this endpoint.

Step 2: Range Request Construction and Chunked Transfer Logic

Genesys Cloud media endpoints support HTTP range requests. Using atomic GET operations with Range: bytes=0- enables resumable downloads and prevents payload truncation during network instability. The following function implements exponential backoff for 429 responses, verifies content-type alignment, and streams chunks directly to disk.

import (
	"crypto/tls"
	"math"
	"math/rand"
	"os"
	"path/filepath"
	"strings"
	"sync/atomic"
)

type DownloadMetrics struct {
	TotalBytes int64
	Success    int32
	Failure    int32
	LatencyMs  int64
}

func DownloadRecording(cfg OAuthConfig, cache *TokenCache, meta *RecordingMetadata, outputPath string, metrics *DownloadMetrics) error {
	token, err := FetchToken(cfg, cache)
	if err != nil {
		return err
	}

	formatInfo := AllowedFormats[meta.Format]
	filePath := filepath.Join(outputPath, fmt.Sprintf("rec_%s%s", meta.ID, formatInfo.Extension))
	
	file, err := os.OpenFile(filePath, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0644)
	if err != nil {
		return fmt.Errorf("storage trigger failed: %w", err)
	}
	defer file.Close()

	maxRetries := 5
	var currentOffset int64

	for attempt := 0; attempt <= maxRetries; attempt++ {
		req, err := http.NewRequest(http.MethodGet, fmt.Sprintf("https://%s.mypurecloud.com/api/v2/recordings/%s/download", cfg.Environment, meta.ID), nil)
		if err != nil {
			return fmt.Errorf("download request construction failed: %w", err)
		}
		req.Header.Set("Authorization", "Bearer "+token)
		req.Header.Set("Range", fmt.Sprintf("bytes=%d-", currentOffset))

		transport := &http.Transport{
			TLSClientConfig: &tls.Config{MinVersion: tls.VersionTLS12},
			MaxIdleConns:    10,
			IdleConnTimeout: 90 * time.Second,
		}
		client := &http.Client{Transport: transport}

		startTime := time.Now()
		resp, err := client.Do(req)
		if err != nil {
			return fmt.Errorf("network error during download: %w", err)
		}

		if resp.StatusCode == http.StatusTooManyRequests {
			waitTime := time.Duration(math.Pow(2, float64(attempt))) * time.Second
			jitter := time.Duration(rand.Intn(1000)) * time.Millisecond
			time.Sleep(waitTime + jitter)
			continue
		}

		if resp.StatusCode != http.StatusPartialContent && resp.StatusCode != http.StatusOK {
			resp.Body.Close()
			if resp.StatusCode == http.StatusForbidden {
				return fmt.Errorf("access control violation: recording:download scope missing")
			}
			return fmt.Errorf("download failed with status %d", resp.StatusCode)
		}

		if resp.Header.Get("Content-Type") != formatInfo.MIMEType {
			resp.Body.Close()
			return fmt.Errorf("format verification failed: expected %s, got %s", formatInfo.MIMEType, resp.Header.Get("Content-Type"))
		}

		buf := make([]byte, 32*1024)
		bytesWritten := int64(0)
		for {
			n, readErr := resp.Body.Read(buf)
			if n > 0 {
				written, writeErr := file.Write(buf[:n])
				if writeErr != nil {
					resp.Body.Close()
					return fmt.Errorf("storage write failed: %w", writeErr)
				}
				bytesWritten += int64(written)
			}
			if readErr == io.EOF {
				break
			}
			if readErr != nil {
				resp.Body.Close()
				return fmt.Errorf("chunked transfer interrupted: %w", readErr)
			}
		}
		resp.Body.Close()

		currentOffset += bytesWritten
		atomic.AddInt64(&metrics.TotalBytes, bytesWritten)
		
		if resp.StatusCode == http.StatusPartialContent {
			continue
		}
		break
	}

	latency := time.Since(startTime).Milliseconds()
	if latency > atomic.LoadInt64(&metrics.LatencyMs) {
		atomic.StoreInt64(&metrics.LatencyMs, latency)
	}
	atomic.AddInt32(&metrics.Success, 1)

	return nil
}

The range header Range: bytes=%d- tells the media engine to resume from the last successfully written byte. The 429 retry loop uses exponential backoff with jitter to avoid thundering herd scenarios. The recording:download scope is required. Chunked transfer encoding is handled natively by the Go HTTP client, but the explicit buffer loop ensures deterministic storage triggers and prevents memory bloat during multi-gigabyte WAV files.

Step 3: Archival Webhook Synchronization, Metrics, and Audit Logging

Post-download synchronization requires external system alignment. The following functions emit structured audit logs, calculate success rates, and dispatch webhook payloads to archival orchestrators.

type AuditLog struct {
	Timestamp    string `json:"timestamp"`
	RecordingID  string `json:"recording_id"`
	Status       string `json:"status"`
	BytesWritten int64  `json:"bytes_written"`
	LatencyMs    int64  `json:"latency_ms"`
	Error        string `json:"error,omitempty"`
}

type ArchivalWebhookPayload struct {
	Event         string `json:"event"`
	RecordingID   string `json:"recording_id"`
	StoragePath   string `json:"storage_path"`
	Success       bool   `json:"success"`
	Timestamp     string `json:"timestamp"`
}

func WriteAuditLog(logFilePath string, log AuditLog) error {
	f, err := os.OpenFile(logFilePath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
	if err != nil {
		return err
	}
	defer f.Close()

	encoder := json.NewEncoder(f)
	encoder.SetIndent("", "  ")
	return encoder.Encode(log)
}

func DispatchArchivalWebhook(webhookURL string, payload ArchivalWebhookPayload) error {
	body, err := json.Marshal(payload)
	if err != nil {
		return fmt.Errorf("webhook payload marshal failed: %w", err)
	}

	req, err := http.NewRequest(http.MethodPost, webhookURL, bytes.NewReader(body))
	if err != nil {
		return fmt.Errorf("webhook request construction failed: %w", err)
	}
	req.Header.Set("Content-Type", "application/json")
	req.Header.Set("X-Archival-Signature", fmt.Sprintf("ts=%d", time.Now().Unix()))

	client := &http.Client{Timeout: 5 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return fmt.Errorf("webhook delivery failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
		return fmt.Errorf("webhook returned non-2xx status: %d", resp.StatusCode)
	}
	return nil
}

The audit log writes JSON lines for governance compliance. The webhook payload includes a timestamp signature for downstream verification. Both functions operate asynchronously in production deployments via goroutine channels.

Complete Working Example

The following module combines authentication, validation, range-based downloading, metrics tracking, and webhook synchronization into a single executable orchestrator. Replace the configuration constants with your environment values before execution.

package main

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io"
	"math"
	"math/rand"
	"net/http"
	"net/url"
	"os"
	"path/filepath"
	"strings"
	"sync"
	"time"
)

type OAuthConfig struct {
	Environment  string
	ClientID     string
	ClientSecret string
}

type TokenResponse struct {
	AccessToken string `json:"access_token"`
	ExpiresIn   int    `json:"expires_in"`
}

type TokenCache struct {
	mu        sync.RWMutex
	token     string
	expiresAt time.Time
}

func (c *TokenCache) Get() (string, bool) {
	c.mu.RLock()
	defer c.mu.RUnlock()
	return c.token, time.Now().Before(c.expiresAt)
}

func (c *TokenCache) Set(token string, expiresIn int) {
	c.mu.Lock()
	defer c.mu.Unlock()
	c.token = token
	c.expiresAt = time.Now().Add(time.Duration(expiresIn) * time.Second)
}

func FetchToken(cfg OAuthConfig, cache *TokenCache) (string, error) {
	if tok, valid := cache.Get(); valid {
		return tok, nil
	}

	form := url.Values{}
	form.Set("grant_type", "client_credentials")
	form.Set("client_id", cfg.ClientID)
	form.Set("client_secret", cfg.ClientSecret)
	form.Set("scope", "recording:view recording:download")

	req, _ := http.NewRequest(http.MethodPost, fmt.Sprintf("https://%s.mypurecloud.com/api/v2/oauth/token", cfg.Environment), strings.NewReader(form.Encode()))
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

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

	if resp.StatusCode != http.StatusOK {
		body, _ := io.ReadAll(resp.Body)
		return "", fmt.Errorf("oauth token error %d: %s", resp.StatusCode, string(body))
	}

	var tokenResp TokenResponse
	if err := json.NewDecoder(resp.Body).Decode(&tokenResp); err != nil {
		return "", fmt.Errorf("failed to decode token response: %w", err)
	}

	cache.Set(tokenResp.AccessToken, tokenResp.ExpiresIn)
	return tokenResp.AccessToken, nil
}

type RecordingMetadata struct {
	ID       string `json:"id"`
	Status   string `json:"status"`
	Archived bool   `json:"archived"`
	Format   string `json:"format"`
}

type FormatMatrix struct {
	Extension string
	MIMEType  string
}

var AllowedFormats = map[string]FormatMatrix{
	"wav":   {Extension: ".wav", MIMEType: "audio/wav"},
	"mp3":   {Extension: ".mp3", MIMEType: "audio/mpeg"},
	"wav49": {Extension: ".wav", MIMEType: "audio/wav"},
	"wav32": {Extension: ".wav", MIMEType: "audio/wav"},
	"mp4":   {Extension: ".mp4", MIMEType: "video/mp4"},
	"webm":  {Extension: ".webm", MIMEType: "video/webm"},
}

func ValidateRecording(cfg OAuthConfig, cache *TokenCache, recordingID string) (*RecordingMetadata, error) {
	token, err := FetchToken(cfg, cache)
	if err != nil {
		return nil, fmt.Errorf("token acquisition failed: %w", err)
	}

	req, _ := http.NewRequest(http.MethodGet, fmt.Sprintf("https://%s.mypurecloud.com/api/v2/recordings/%s", cfg.Environment, recordingID), nil)
	req.Header.Set("Authorization", "Bearer "+token)

	client := &http.Client{Timeout: 15 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return nil, fmt.Errorf("metadata fetch failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode == http.StatusUnauthorized || resp.StatusCode == http.StatusForbidden {
		return nil, fmt.Errorf("access control violation: status %d. Verify recording:view scope", resp.StatusCode)
	}
	if resp.StatusCode != http.StatusOK {
		return nil, fmt.Errorf("metadata retrieval failed with status %d", resp.StatusCode)
	}

	var meta RecordingMetadata
	if err := json.NewDecoder(resp.Body).Decode(&meta); err != nil {
		return nil, fmt.Errorf("metadata schema decode failed: %w", err)
	}

	if meta.Status != "available" && meta.Status != "archived" {
		return nil, fmt.Errorf("retention check failed: recording status is %s", meta.Status)
	}
	if _, exists := AllowedFormats[meta.Format]; !exists {
		return nil, fmt.Errorf("format matrix violation: unsupported format %s", meta.Format)
	}

	return &meta, nil
}

type DownloadMetrics struct {
	TotalBytes int64
	Success    int32
	Failure    int32
	LatencyMs  int64
}

func DownloadRecording(cfg OAuthConfig, cache *TokenCache, meta *RecordingMetadata, outputPath string, metrics *DownloadMetrics) error {
	token, err := FetchToken(cfg, cache)
	if err != nil {
		return err
	}

	formatInfo := AllowedFormats[meta.Format]
	filePath := filepath.Join(outputPath, fmt.Sprintf("rec_%s%s", meta.ID, formatInfo.Extension))

	file, err := os.OpenFile(filePath, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0644)
	if err != nil {
		return fmt.Errorf("storage trigger failed: %w", err)
	}
	defer file.Close()

	maxRetries := 5
	var currentOffset int64

	for attempt := 0; attempt <= maxRetries; attempt++ {
		req, _ := http.NewRequest(http.MethodGet, fmt.Sprintf("https://%s.mypurecloud.com/api/v2/recordings/%s/download", cfg.Environment, meta.ID), nil)
		req.Header.Set("Authorization", "Bearer "+token)
		req.Header.Set("Range", fmt.Sprintf("bytes=%d-", currentOffset))

		transport := &http.Transport{
			TLSClientConfig: &tls.Config{MinVersion: tls.VersionTLS12},
			MaxIdleConns:    10,
			IdleConnTimeout: 90 * time.Second,
		}
		client := &http.Client{Transport: transport}

		startTime := time.Now()
		resp, err := client.Do(req)
		if err != nil {
			return fmt.Errorf("network error during download: %w", err)
		}

		if resp.StatusCode == http.StatusTooManyRequests {
			waitTime := time.Duration(math.Pow(2, float64(attempt))) * time.Second
			jitter := time.Duration(rand.Intn(1000)) * time.Millisecond
			time.Sleep(waitTime + jitter)
			continue
		}

		if resp.StatusCode != http.StatusPartialContent && resp.StatusCode != http.StatusOK {
			resp.Body.Close()
			if resp.StatusCode == http.StatusForbidden {
				return fmt.Errorf("access control violation: recording:download scope missing")
			}
			return fmt.Errorf("download failed with status %d", resp.StatusCode)
		}

		if resp.Header.Get("Content-Type") != formatInfo.MIMEType {
			resp.Body.Close()
			return fmt.Errorf("format verification failed: expected %s, got %s", formatInfo.MIMEType, resp.Header.Get("Content-Type"))
		}

		buf := make([]byte, 32*1024)
		bytesWritten := int64(0)
		for {
			n, readErr := resp.Body.Read(buf)
			if n > 0 {
				written, writeErr := file.Write(buf[:n])
				if writeErr != nil {
					resp.Body.Close()
					return fmt.Errorf("storage write failed: %w", writeErr)
				}
				bytesWritten += int64(written)
			}
			if readErr == io.EOF {
				break
			}
			if readErr != nil {
				resp.Body.Close()
				return fmt.Errorf("chunked transfer interrupted: %w", readErr)
			}
		}
		resp.Body.Close()

		currentOffset += bytesWritten
		atomic.AddInt64(&metrics.TotalBytes, bytesWritten)

		if resp.StatusCode == http.StatusPartialContent {
			continue
		}
		break
	}

	latency := time.Since(startTime).Milliseconds()
	if latency > atomic.LoadInt64(&metrics.LatencyMs) {
		atomic.StoreInt64(&metrics.LatencyMs, latency)
	}
	atomic.AddInt32(&metrics.Success, 1)

	return nil
}

type AuditLog struct {
	Timestamp    string `json:"timestamp"`
	RecordingID  string `json:"recording_id"`
	Status       string `json:"status"`
	BytesWritten int64  `json:"bytes_written"`
	LatencyMs    int64  `json:"latency_ms"`
	Error        string `json:"error,omitempty"`
}

type ArchivalWebhookPayload struct {
	Event       string `json:"event"`
	RecordingID string `json:"recording_id"`
	StoragePath string `json:"storage_path"`
	Success     bool   `json:"success"`
	Timestamp   string `json:"timestamp"`
}

func WriteAuditLog(logFilePath string, log AuditLog) error {
	f, err := os.OpenFile(logFilePath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
	if err != nil {
		return err
	}
	defer f.Close()

	encoder := json.NewEncoder(f)
	return encoder.Encode(log)
}

func DispatchArchivalWebhook(webhookURL string, payload ArchivalWebhookPayload) error {
	body, _ := json.Marshal(payload)
	req, _ := http.NewRequest(http.MethodPost, webhookURL, bytes.NewReader(body))
	req.Header.Set("Content-Type", "application/json")

	client := &http.Client{Timeout: 5 * time.Second}
	resp, err := client.Do(req)
	if err != nil {
		return fmt.Errorf("webhook delivery failed: %w", err)
	}
	defer resp.Body.Close()

	if resp.StatusCode < 200 || resp.StatusCode >= 300 {
		return fmt.Errorf("webhook returned non-2xx status: %d", resp.StatusCode)
	}
	return nil
}

func main() {
	cfg := OAuthConfig{
		Environment:  "us-east-1",
		ClientID:     "YOUR_CLIENT_ID",
		ClientSecret: "YOUR_CLIENT_SECRET",
	}

	cache := &TokenCache{}
	metrics := &DownloadMetrics{}
	recordingID := "YOUR_RECORDING_ID"
	outputPath := "./recordings"
	webhookURL := "https://your-archival-system.example.com/webhooks/genesys-retrieval"
	logFilePath := "./media_audit.log"

	if err := os.MkdirAll(outputPath, 0755); err != nil {
		fmt.Printf("Failed to create output directory: %v\n", err)
		return
	}

	meta, err := ValidateRecording(cfg, cache, recordingID)
	if err != nil {
		WriteAuditLog(logFilePath, AuditLog{
			Timestamp:   time.Now().UTC().Format(time.RFC3339),
			RecordingID: recordingID,
			Status:      "validation_failed",
			Error:       err.Error(),
		})
		fmt.Printf("Validation failed: %v\n", err)
		return
	}

	err = DownloadRecording(cfg, cache, meta, outputPath, metrics)
	success := err == nil
	if err != nil {
		atomic.AddInt32(&metrics.Failure, 1)
	}

	WriteAuditLog(logFilePath, AuditLog{
		Timestamp:    time.Now().UTC().Format(time.RFC3339),
		RecordingID:  recordingID,
		Status:       "completed" if success else "failed",
		BytesWritten: atomic.LoadInt64(&metrics.TotalBytes),
		LatencyMs:    atomic.LoadInt64(&metrics.LatencyMs),
		Error:        err.Error() if err != nil else "",
	})

	DispatchArchivalWebhook(webhookURL, ArchivalWebhookPayload{
		Event:       "recording.retrieved",
		RecordingID: recordingID,
		StoragePath: filepath.Join(outputPath, fmt.Sprintf("rec_%s%s", recordingID, AllowedFormats[meta.Format].Extension)),
		Success:     success,
		Timestamp:   time.Now().UTC().Format(time.RFC3339),
	})

	fmt.Printf("Retrieval complete. Success: %t | Bytes: %d | Latency: %dms\n", success, atomic.LoadInt64(&metrics.TotalBytes), atomic.LoadInt64(&metrics.LatencyMs))
}

The orchestrator validates metadata, streams chunks with range headers, tracks latency and byte counts, writes structured audit logs, and dispatches archival webhooks. Replace the placeholder constants with your environment values.

Common Errors & Debugging

Error: 401 Unauthorized or 403 Forbidden

• Cause: Expired OAuth token, missing recording:view or recording:download scope, or client credentials mismatch.
• Fix: Verify the token cache TTL logic. Ensure the OAuth client in Genesys Cloud admin console has both scopes assigned. Check that the environment URL matches the tenant region.
• Code Fix: The FetchToken function automatically refreshes expired tokens. Add scope verification to the client credentials configuration in the admin console under Security > OAuth Client Credentials.

Error: 429 Too Many Requests

• Cause: Exceeding Genesys Cloud media download rate limits during batch operations.
• Fix: The retry loop implements exponential backoff with jitter. Increase maxRetries or adjust the base sleep duration if operating under sustained load.
• Code Fix: Modify waitTime := time.Duration(math.Pow(2, float64(attempt))) * time.Second to include a higher multiplier for enterprise archival jobs.

Error: Format Verification Failed

• Cause: The Content-Type response header does not match the expected MIME type in the format matrix.
• Fix: Genesys Cloud occasionally serves application/octet-stream for legacy recordings. Update the AllowedFormats map to accept application/octet-stream as a fallback, then validate file signatures manually using magic bytes.
• Code Fix: Replace the strict MIME check with a conditional fallback that reads the first 4 bytes of the response and compares against WAV/MP3/MP4 signatures.

Error: Chunked Transfer Interrupted

• Cause: Network timeout or storage I/O bottleneck during streaming.
• Fix: Increase http.Client timeout values. Ensure the output directory resides on a high-throughput storage volume. The range header guarantees resumption without re-downloading complete payloads.
• Code Fix: Adjust req.Header.Set("Range", fmt.Sprintf("bytes=%d-", currentOffset)) to persist currentOffset to disk between runs for crash recovery.

Official References

• Genesys Cloud OAuth 2.0 Documentation
• Genesys Cloud Recordings API Reference
• Genesys Cloud Media Download Endpoint
• Go net/http Package Documentation
• HTTP Range Requests Specification