Just noticed that PUT /api/v2/conversations/{conversationId}/participants/{participantId} returns 409 Conflict when modifying attributes during an active voice leg. I’m using the standard Go http.Client with concurrent updates and need to handle this specific race condition.
Is there a documented retry strategy or ETag pattern I should implement in Go to resolve the conflict without dropping the call? I want to ensure the attribute update persists despite the concurrent state changes.
The official documentation states that the 409 Conflict indicates a version mismatch on the participant resource, not necessarily a race condition in your client, so you must fetch the current version before attempting the update. The platform uses optimistic locking, meaning your PUT request must include the specific version of the participant object you are trying to modify, or it will reject the change to prevent data corruption. In Go, you need to perform a GET request first to retrieve the version field from the participant object, then inject that value into your PUT payload. This ensures the platform knows you are updating the latest state of the resource.
// Step 1: Fetch current participant to get the version
req, _ := http.NewRequest("GET", fmt.Sprintf("%s/api/v2/conversations/%s/participants/%s", base, convID, partID), nil)
resp, err := client.Do(req)
// ... handle err ...
var participant ParticipantResponse
json.NewDecoder(resp.Body).Decode(&participant)
// Step 2: Update payload with the retrieved version
payload := map[string]interface{}{
"externalContactId": "ext-123",
"attributes": map[string]interface{}{
"priority": "high",
},
"version": participant.Version, // Critical: Include current version
}
// Step 3: Send PUT request
putReq, _ := http.NewRequest("PUT", fmt.Sprintf("%s/api/v2/conversations/%s/participants/%s", base, convID, partID), bytes.NewBuffer(payloadBytes))
putReq.Header.Set("Content-Type", "application/json")
putResp, err := client.Do(putReq)
Always verify the version field in the GET response matches what you send in the PUT, otherwise the platform will continue to return 409s regardless of your retry logic.
It’s worth reviewing at implementing an optimistic locking pattern directly in your Go client rather than relying on generic retry loops. The 409 Conflict is not a race condition in the traditional sense; it is the platform enforcing data integrity via the version field. If your client does not fetch the current version before updating, the API will reject the request to prevent overwriting concurrent changes.
Here is a robust approach using the Go SDK (PureCloudPlatformClientV2) to handle this safely:
Fetch Current Participant: Use GetConversationParticipant to retrieve the latest version number.
Update Payload: Inject the fetched version into your UpdateParticipant request body.
Execute Update: Send the PUT request with the correct version.
// Assuming apiInstance is your PureCloudPlatformClientV2 instance
conversationId := "your-conversation-id"
participantId := "your-participant-id"
// 1. Get current version
participant, _, err := apiInstance.ConversationApi.GetConversationParticipant(
context.Background(),
conversationId,
participantId,
map[string]interface{}{"expand": []string{"attributes"}}
)
if err != nil {
log.Fatalf("Failed to get participant: %v", err)
}
// 2. Prepare update with version
body := platformclientv2.Participant{
ExternalContactId: platformclientv2.PtrString("ext-123"),
Attributes: map[string]platformclientv2.ParticipantAttribute{
"priority": {
Value: platformclientv2.PtrString("high"),
},
},
Version: participant.Version, // Critical for avoiding 409
}
// 3. Perform update
_, resp, err := apiInstance.ConversationApi.PutConversationParticipant(
context.Background(),
conversationId,
participantId,
body
)
if resp.StatusCode == 409 {
log.Println("Version mismatch detected, retry with fresh GET")
}
This method ensures you always update against the latest state. Ignoring the version field will consistently trigger 409 Conflict responses during active legs.