Pull Sync in CouchbaseLite

preethi.minti · March 19, 2016, 11:57pm

Do you have a sample Cordova application where the pull replication works? I am only able to push data to the couchbase server but I am not able to pull the data from couchbase to couchbaselite via sync gateway.
I want to really understand what configuration is missing. Any help greatly appreciated.

Preethi

atom_yang · March 20, 2016, 4:35am

FYI

preethi.minti · March 20, 2016, 6:57am

Thank you! I am able to set this up and get it working. I need to add and edit document on couchbase server and pull them to couchbase light via sync gateway. If I add or edit a document manually in the couchbase server, I am not able to sync them over to couchbase lite. What do I need to do to get this working. Thanks for the help!!

atom_yang · March 20, 2016, 11:43am

You shouldn’t edit document in the couchbase server directly, you should modify document by sync Gateway REST API

preethi.minti · March 21, 2016, 7:33am

Thank you, I was able to use REST Apis for all CRUD operations. Is there a way to view the couchbaselite database embedded in the mobile app? We currently use sqlite and we can see the database using a sqlite browser. How can we do the same with Couchbaselite just to see the records that are present in that.

preethi.minti · March 21, 2016, 7:57am

Also, I have another question, does the sync gateway just pass the data over to the couchbase or does it actually keep the copy of the data on the server? The reason I ask is, since this will be on the DMZ and public facing, we do not want it to store the data/documents there. As long as the data is just routed to the Couchbase server and not stored there, there is no violation of sensitive data. Could you please let me know about this?

atom_yang · March 21, 2016, 3:57pm

You can use this tools to view data in cbl.
also, you can browser all data using cbl rest api:all_docs.

jens · March 21, 2016, 3:57pm

There is a Couchbase Lite Viewer app.

does the sync gateway just pass the data over to the couchbase or does it actually keep the copy of the data on the server?

The data lives in a bucket in the Couchbase Server. The Sync Gateway just routes data between that bucket and the Couchbase Lite clients; it has no persistent storage of its own.

atom_yang · March 21, 2016, 3:59pm

@jens Can Couchbase Lite Viewer support CouchbaseLite 1.2.0 ,see also The Viewer don't support Couchbase Lite 1.2 · Issue #21 · couchbaselabs/CouchbaseLiteViewer · GitHub

preethi.minti · March 21, 2016, 4:21pm

Thank you very much, that gives us big relief!!

preethi.minti · March 22, 2016, 4:33am

Hi there, how can we encrypt data on couchbase lite. I am using phonegap/Cordova. On the Couchbase website I see encryption snippet for ios/swift/android. I dont see anything that indicates how this can be done for cordova. Can you point me to that? Thanks much!!

atom_yang · March 22, 2016, 1:45pm

see

I think you should implement yourself, or just wait.

preethi.minti · March 22, 2016, 3:23pm

I have a generic question on Couchbase lite. Can the sync between couchbase lite and couchbase continuously happen as long as the sync gateway is up and running? Does it matter if the app on the tablet is foreground or background? If the app is background will the sync stop?

jens · March 22, 2016, 5:04pm

It depends on the OS. On Android, apps are allowed to use the network while in the background, so the answer is yes. On the other hand, leaving sockets open and processing incoming data will consume power, so users may not like that your app makes the battery drain faster.

On iOS, apps are not allowed to leave sockets open in the background for more than a brief time (like 30 sec?) or to run continuous background tasks. So the answer is no.

On both platforms, you can use OS-specific push notifications — you can set up your server to relay a notification to the device when there are changes available, and this can trigger your app to wake up briefly and sync. The details of push notifications are specific to the OS.

preethi.minti · March 23, 2016, 3:02am

Thank you! We want to use a custom document ID based on our internal data and not use auto generated id to post the document. I have not seen that snippet for Cordova anywhere. Where can this be done before posting the document over?

atom_yang · March 23, 2016, 4:09am

I think that depend on your docs design.In my case, I use doc’s type concat separator,such as :: ,and concat UUID as doc’s id. such as

MSG::de305d54-75b4-431b-adb2-eb6b9e546014

There is a lot of implementation in javascript,
even you can use couchbase-lite rest api,such as

curl http://127.0.0.1:5984/_uuids?count=10

to generate uuid， it will return as follows.

{"uuids":["b5decd38-12b7-44d9-a9c1-61b07b0d8459","01db4f03-b01a-4d78-a596-a0a1ef2cffed","8c2b13ed-5abc-45e1-9efd-f877c3f04f48","e8f47e14-cda3-4d75-bbf4-7f001df9ba93","ba06c573-10ea-40a6-a749-53f481f2b7eb","5e9613a1-f1bb-47cd-87ea-d7516b4bbf24","68fcd134-1af1-4cba-8ef4-99e9b8afa075","c8eac5c0-9094-49b0-bb41-13f8d7288be0","b3e31409-0309-463b-9902-0050c16fd08b","8bc7f5fc-82e8-4b23-b906-99770e47d3eb"]}

preethi.minti · March 23, 2016, 4:42am

Sorry, I meant to ask, where is the code in todo lite phonegap app to generate this id associate with the document.

I mean the ids are getting posted to the CouchbaseServer like this 09703607-d157-4e19-b33a-2a4b84ed6de8. Where can I explicitly handle this in index.js so that I can assign an ID to each document I post to Sync gateway and not have it auto generate this long id?

atom_yang · March 23, 2016, 5:09am

If you use post-db API, the id of docs will be auto generated.
but if you use put-db-doc api, you can assign the doc’s id.

preethi.minti · March 23, 2016, 5:38am

Thank you for all your replies!! It worked!!. I have one more question, what is the username and password for localhost:5984? I have not set any for this application. When I try to access it it asks me for username and password.

atom_yang · March 23, 2016, 5:47am

If you use Couchbase-Lite-PhoneGap-Plugin,username and password is generated by Random,see also:

github.com

couchbaselabs/Couchbase-Lite-PhoneGap-Plugin/blob/master/src/android/CBLite.java#L52


		System.out.println("initialize() called");


		super.initialize(cordova, webView);
		initCBLite();


	}


	private void initCBLite() {
		try {


		    allowedCredentials = new Credentials();


			URLStreamHandlerFactory.registerSelfIgnoreError();


			View.setCompiler(new JavaScriptViewCompiler());
			Database.setFilterCompiler(new JavaScriptReplicationFilterCompiler());


			Manager server = startCBLite(this.cordova.getActivity());


			listenPort = startCBLListener(DEFAULT_LISTEN_PORT, server, allowedCredentials);

and

github.com

couchbase/couchbase-lite-java-listener/blob/master/src/main/java/com/couchbase/lite/listener/Credentials.java#L27


}


public String getLogin() {
    return login;
}


public String getPassword() {
    return password;
}


public void setRandomUsernamePassword() {
    login = UUID.randomUUID().toString();
    password = UUID.randomUUID().toString();
}


public boolean empty() {
    boolean loginEmpty = (login == null || login.isEmpty());
    boolean passwordEmpty = (password == null || password.isEmpty());
    return loginEmpty && passwordEmpty;
}

so may be you can print the cbl url to get username and password of cbl. see also:

github.com

couchbaselabs/TodoLite-PhoneGap/blob/master/js/index.js#L582


var mustache = require("mustache"),
    t = {}


$('script[type="text/mustache"]').each(function() {
    var id = this.id.split('-')
    id.pop()
    t[id.join('-')] = mustache.compile(this.innerHTML.replace(/^\s+|\s+$/g,''))
});


cblite.getURL(function(err, url) {
    console.log("getURL: " + JSON.stringify([err, url]))
    if (err) {return done(err)}


    if (!/Apple/.test(navigator.userAgent)) {
        // this helps on Android < 4.4
        // otherwise basic auth doesn't work
        var xmlHttp = new XMLHttpRequest()
        xmlHttp.open( 'GET', url, false )
        xmlHttp.send( null )
        console.log( 'XMLHttpRequest get: ' +  xmlHttp.responseText )
    }

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Pull Sync in CouchbaseLite

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