Function: Advanced TOUCH Operation

Enterprise Edition

Perform the Advanced TOUCH operation where Eventing interacts with the Data Service.

The advancedTouchOp function:

Performs the Advanced TOUCH operation
Requires Eventing Storage (or a metadata collection) and a source collection
Requires a binding of type bucket alias
Operates on any mutation where the meta.id or KEY starts with ten_seconds:
Does not require that you send the document back to the Data Service to update the TTL

For more information about the Advanced TOUCH operation, see Advanced TOUCH Operation.

advancedTouchOp
Input Data
Output Data

// Configure the settings for the advancedTouchOp function as follows:
//
// Version 7.6+
//   "Function Scope"
//     *.* (or try bulk.data if non-privileged)
//   "Listen to Location"
//     bulk.data.source
//   "Eventing Storage"
//     rr100.eventing.metadata
//   Binding(s)
//    1. "binding type", "alias name...", "bucket.scope.collection", "Access"
//       "bucket alias", "src_col",       "bulk.data.source",        "read and write"

function OnUpdate(doc, meta) {
    if (! meta.id.startsWith("ten_seconds:") ) return;

    log('input meta', meta);
    log('input doc', doc);

    var expiry = new Date();
    expiry.setSeconds(expiry.getSeconds() + 10);

    var req = {"id": meta.id, "expiry_date": expiry};
    var result = couchbase.touch(src_col, req);
    if (result.success) {
        log('success adv. touch: result', result);
    } else {
        log('failure adv. touch: id', req.id, 'result', result);
    }
}

INPUT: KEY ten_seconds:001

{
    "id": "ten_seconds:001",
    "type": "Auto-deletes in 10 seconds. Keep refreshing to retrieve documents."
}

2024-03-15T11:57:51.103-07:00 [INFO] "input doc"
{
  "id": "ten_seconds:001",
  "type": "Auto-deletes in 10 seconds. Keep refreshing to retrieve documents."
}

2024-03-15T11:57:51.103-07:00 [INFO] "input meta"
{
  "cas": "1710529071079817216",
  "id": "ten_seconds:001",
  "expiration": 0,
  "flags": 33554438,
  "vb": 679,
  "seq": 102,
  "datatype": "json",
  "keyspace":
  {
    "bucket_name": "travel-sample",
    "scope_name": "tenant_agent_00",
    "collection_name": "bookings"
  },
  "cid": 18
}

2024-03-15T11:57:51.108-07:00 [INFO] "success adv. touch: result"
{
  "meta":
  {
    "id": "ten_seconds:001",
    "cas": "1710529071107276800"
  },
  "success": true
}

2024-03-15T11:58:03.302-07:00 [INFO] "Doc deleted/expired" "ten_seconds:001"
{
  "expired": true
}