Manage documents using server-side javascript function

oberon · October 29, 2013, 9:29am

I would like to know if couchbase server, or sync gateway, support server-side execution of custom logic.

I mean, if I can use sync_function (or any javascript function in the server) to edit a new document that is received, before it’s stored.

Thanks.

tgrall · October 31, 2013, 6:52am

Hello,

No you cannot add serverside logic in the current release Couchbase Server. The main reason is -predictable- performance, if you start to add such logic in the server it may impact the performance.

For the Sync Gateway you have:

data routing to channels. channel access control. This is the sync function
asynchronous workers – eg a server process that follows the changes feed for a few channels and does work based on what documents come through changes.

You can find example of this here:

github.com

couchbaselabs/CouchChat-iOS/blob/push/push-notifications/index.js#L26


"bucket" : "chat"
}, function(err, bucket) {
if (err) throw (err)
// console.log("bucket", bucket)
bucket.get("_push:seq", function(err, push_seq) {
  if (err) {
    push_seq = "";
  }
  console.log("push_seq", push_seq)


  var push = sw.channels(["profiles","push"], {since : push_seq})
  push.on("doc", function(doc, change) {
    if (doc.email) {
      var payload = {
        aliases : [doc.email],
        aps : {
          alert : "Welcome to CouchChat, " + (doc.nick || doc.email)+"."
        }
      }
      ua.pushNotification("/api/push", payload, function(err){
        if (err) {

Regards
Tug
@tgrall