Scripts/rendezvous
==================

* :download:`Download example <rendezvous.py>`

...


rendezvous.py
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.. sourcecode:: python

    #!/usr/bin/env python
    """
    This script using NSNetServiceBrowser to look for local HTTP servers.
    """
    
    import objc
    from Foundation import NSDate, NSNetServiceBrowser, NSObject, NSRunLoop
    
    objc.setVerbose(1)
    
    
    class PrintingResolverDelegate(NSObject):
        def netServiceDidResolveAddress_(self, service):
            addresses = service.addresses()
            if len(addresses) == 0:
                return
            print(f"{service.name()}.{service.domain()}")
            for address in service.addresses():
                print(f"   {address}")
            print("")
            service.setDelegate_(None)
    
        def netService_didNotResolve_(self, service, didNotResolve):
            print("didNotResolve", didNotResolve)
            service.setDelegate_(None)
    
    
    class PrintingBrowserDelegate(NSObject):
        def startLookup(self):
            self.delegates = []
            for aNetService in self.services:
                prd = PrintingResolverDelegate.new()
                aNetService.setDelegate_(prd)
                aNetService.resolve()
                self.delegates.append(prd)
    
        def netServiceBrowserWillSearch_(self, browser):
            print("Browsing for advertised services...")
            self.services = []
    
        def netServiceBrowserDidStopSearch_(self, browser):
            print("Browse complete")
            self.startLookup()
    
        def netServiceBrowser_didNotSearch_(self, browser, errorDict):
            print("Could not search.")
    
        def netServiceBrowser_didFindService_moreComing_(
            self, browser, aNetService, moreComing
        ):
            print(f"Found a service: {aNetService.name()} {aNetService.domain()}")
            self.services.append(aNetService)
            if not moreComing:
                browser.stop()
    
        def netServiceBrowser_didRemoveService_moreComing_(
            self, browser, aNetService, moreComing
        ):
            print(f"Service removed: {aNetService.name()}")
            if not moreComing:
                browser.stop()
    
    
    def findDomains(serviceName, seconds=5.0):
        runloop = NSRunLoop.currentRunLoop()
        browser = NSNetServiceBrowser.new()
        pbd = PrintingBrowserDelegate.new()
        browser.setDelegate_(pbd)
        browser.searchForServicesOfType_inDomain_(serviceName, "")
        untilWhen = NSDate.dateWithTimeIntervalSinceNow_(seconds)
        runloop.runUntilDate_(untilWhen)
    
    
    if __name__ == "__main__":
        # Use '_afpovertcp' instead of '_http' to look for fileservers.
        findDomains("_afpovertcp._tcp")

