Client library¶

Now we edit the dapp part used directly by clients, located at myfirstdapp/library/. The empty template has a file called myfirstdapp/library/EmptyManager.py, but we can rename it with a better name, like MyFirstManager.py.

In our library, we define a module that binds the API calls described after, which will be used to write client applications. We do this by extending the licontractvm.DappManager. This class includes the services of our dapp, by binding the API calls myfirstdapp.get and myfirstdapp.set. The method set only creates and broadcasts a new message containing the given key-value pair; the method get performs a consensus query to nodes, and returns the resulting value.

class MyFirstManager (DappManager.DappManager):
        def __init__ (self, consensusManager, wallet = None):
                super (MyFirstManager, self).__init__(consensusManager, wallet)

        def set (self, key, value):
                cid = self.produceTransaction ('myfirstdapp.set', [key, value])
                return cid

        def get (self, key):
                r = self.consensusManager.jsonConsensusCall ('myfirstdapp.get', [key])
                return r['result']