Function: Multi Collection Eventing

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// Configure the settings for the multiCollectionEventing function as follows:
//
// Set up four (4) required keyspaces in two buckets "rr100" and "source"
//   rr100.eventing.metadata
//   source._default._default
//   source.myscope.mycol1
//   source.myscope.mycol2
//
// Version 7.1.1+
//   "Function Scope"
//     *.* (or try source.* if non-privileged)
//   "Listen to Location"
//     source.*.*
//   "Eventing Storage"
//     rr100.eventing.metadata
//   Create four (4) Bindings
//       "binding type", "alias name...", "bucket.scope.collection",     "Access"
//       ---------------------------------------------------------------------------
//       "bucket alias", "alias_ro",      "source.myscope.*",            "read only"
//       "bucket alias", "alias_rw",      "source.myscope.*",            "read and write"
//   Deploy the Function
//   Create the following three (3) documents one at a time and inspect the Application log each time
//       "bucket.scope.collection"   KEY     DATA
//       ---------------------------------------------------------------------------
//       source._default._default    doc0    {"data": "doc0"}
//       source.myscope.mycol1       doc1    {"data": "doc1"}
//       source.myscope.mycol2       doc2    {"data": "doc2"}

function OnUpdate(doc, meta) {
    log('>>>A IN',doc, meta);

    // TEST GET with hardcode keyspace
    var res1 = couchbase.get(alias_ro,{"id": "doc2", "keyspace":
        {"bucket_name": "source","scope_name": "myscope","collection_name": "mycol2"}});
    log('>>>B fixed read',"res1", res1);

    // Protect against reading from something outside the alias
    if (meta.keyspace.scope_name == "myscope") {
        // TEST GET with keyspace from meta
        var res2 = couchbase.get(alias_ro,meta);
        log('>>>C read using passed meta (must be myscope)',"res2", res2);

        if (meta.keyspace.collection_name == "mycol2") {
            // TEST UPSERT with hardcode keyspace
            // Add a field to the document read in res1
            res1.doc.random1 = Math.random();
            var res3 = couchbase.upsert(alias_rw,{"id": "doc2", "keyspace":
                {"bucket_name": "source","scope_name": "myscope","collection_name": "mycol2"}}, res1.doc)
            log('>>>D upsert',"res3", res3);

            // TEST REPLACE with hardcode keyspace
            res1.doc.random2 = Math.random();
            var res4 = couchbase.replace(alias_rw,{"id": "doc2", "keyspace":
                {"bucket_name": "source","scope_name": "myscope","collection_name": "mycol2"}}, res1.doc)
            log('>>>E replace',"res4", res4);

            // TEST GET with hardcode keyspace
            var res5 = couchbase.get(alias_rw,meta);
            log('>>>F get (show added fields)',"res5", res5);

            // TEST DELETE with hardcode keyspace (so the insert can be tested)
            var res6 = couchbase.delete(alias_rw,{"id": "doc2", "keyspace":
                {"bucket_name": "source","scope_name": "myscope","collection_name": "mycol2"}})
            log('>>>G delete',"res6", res6);

            // TEST INSERT with hardcode keyspace
            // Remove the added items
            delete res1.doc.random1;
            delete res1.doc.random2;
            var res7 = couchbase.insert(alias_rw,{"id": "doc2", "keyspace":
                {"bucket_name": "source","scope_name": "myscope","collection_name": "mycol2"}}, res1.doc)
            log('>>>H upsert',"res7", res7);
        }
    }
}