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mc — a simple Mesos-DNS client 2 | 3 | 4 | This is a simple [Mesos-DNS](http://mesosphere.github.io/mesos-dns/) client written in Python. 5 | 6 | Use it as CLI tool like so: 7 | 8 | $ ./mc.py localhost redis.marathon.mesos 9 | $ Discovered redis.marathon.mesos running on 10.141.141.10:31000 10 | 11 | Alternatively you can `import mc` in your Python app and use `lookup_service(mesosdns_server, service_name)` which will yield an `(ip, port)` tuple for the logical `service_name`. 12 | 13 | 14 | -------------------------------------------------------------------------------- /__init__.py: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/mhausenblas/mc/9db8dbf7551c38d086a8cf05422e842ca746ef67/__init__.py -------------------------------------------------------------------------------- /mc.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python 2 | """ 3 | The Mesos-DNS Client 4 | 5 | Usage: 6 | 7 | ./mc.py $MESOS_DNS_HOST $SERVICE_NAME 8 | 9 | Make sure that Mesos-DNS is installed and running, see: 10 | http://mesosphere.github.io/mesos-dns/docs/ 11 | 12 | Example: 13 | 14 | ./mc.py localhost flask.marathon.mesos 15 | 16 | @author: Michael Hausenblas, http://mhausenblas.info/#i 17 | @since: 2015-06-01 18 | @status: init 19 | """ 20 | 21 | import sys 22 | import os 23 | import logging 24 | import urllib2 25 | import json 26 | import random 27 | 28 | 29 | ################################################################################ 30 | # Config 31 | # 32 | DEBUG = True 33 | MESOS_DNS_PORT = 8123 34 | 35 | ################################################################################ 36 | # Global vars 37 | # 38 | 39 | if DEBUG: 40 | FORMAT = '%(asctime)-0s %(levelname)s %(message)s [at line %(lineno)d]' 41 | logging.basicConfig(level=logging.DEBUG, format=FORMAT, datefmt='%Y-%m-%dT%I:%M:%S') 42 | else: 43 | FORMAT = '%(asctime)-0s %(message)s' 44 | logging.basicConfig(level=logging.INFO, format=FORMAT, datefmt='%Y-%m-%dT%I:%M:%S') 45 | 46 | def lookup_service(mesosdns_server, service_name): 47 | mesosdns_endpoint = 'http://' + mesosdns_server + ':' + str(MESOS_DNS_PORT) 48 | logging.debug('Discovery of service %s using %s' %(service_name, mesosdns_endpoint)) 49 | components = service_name.split('.') 50 | lookup = '_' + components[0] + '._tcp.' + '.'.join(str(x) for x in components[1:]) 51 | logging.debug('Looking up: %s ' %(lookup)) 52 | payload = json.load(urllib2.urlopen(mesosdns_endpoint + '/v1/services/' + lookup + '.')) 53 | service_instance = random.choice(payload) 54 | return (service_instance['ip'], service_instance['port']) 55 | 56 | ################################################################################ 57 | # Main script 58 | # 59 | if __name__ == '__main__': 60 | try: 61 | (ip, port) = lookup_service(sys.argv[1], sys.argv[2]) 62 | print 'Discovered %s running on %s:%s' %(sys.argv[2], str(ip), str(port)) 63 | except err: 64 | print(err) 65 | print(__doc__) 66 | sys.exit(2) 67 | -------------------------------------------------------------------------------- /sedi.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python 2 | """ 3 | A simple service discovery proxy for Mesos-DNS, exposing a CORS-enabled HTTP API. 4 | It is assumed to run on the same host as Mesos-DNS. 5 | 6 | Usage: 7 | 8 | ./sedi.py 9 | 10 | Make sure that Mesos-DNS is installed and running, see: 11 | http://mesosphere.github.io/mesos-dns/docs/ 12 | 13 | 14 | @author: Michael Hausenblas, http://mhausenblas.info/#i 15 | @since: 2015-06-19 16 | @status: init 17 | """ 18 | 19 | import sys 20 | import json 21 | import urlparse 22 | import urllib 23 | from mc import lookup_service 24 | from BaseHTTPServer import BaseHTTPRequestHandler 25 | 26 | class SeDiProxy(BaseHTTPRequestHandler): 27 | 28 | def do_GET(self): 29 | parsed_path = urlparse.urlparse(self.path) 30 | logical_service_name = parsed_path.path[1:] 31 | self.resolve(logical_service_name) 32 | return 33 | 34 | def resolve(self, logical_service_name): 35 | self.send_response(200) 36 | self.send_header('Access-Control-Allow-Origin', '*') # enable CORS 37 | self.end_headers() 38 | (ip, port) = lookup_service('localhost', logical_service_name) 39 | self.wfile.write( 'http://' + ip + ':' + port ) 40 | 41 | ################################################################################ 42 | # Main script 43 | # 44 | if __name__ == '__main__': 45 | from BaseHTTPServer import HTTPServer 46 | server = HTTPServer(('', 31313), SeDiProxy) 47 | server.serve_forever() 48 | --------------------------------------------------------------------------------