Initial checkin of gRPC to third_party/

third_party/grpc/tools/run_tests/port_server.py

+#!/usr/bin/env python2.7
+# Copyright 2015, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Manage TCP ports for unit tests; started by run_tests.py"""
+
+import argparse
+import BaseHTTPServer
+import hashlib
+import os
+import socket
+import sys
+import time
+
+
+# increment this number whenever making a change to ensure that
+# the changes are picked up by running CI servers
+# note that all changes must be backwards compatible
+_MY_VERSION = 7
+
+
+if len(sys.argv) == 2 and sys.argv[1] == 'dump_version':
+  print _MY_VERSION
+  sys.exit(0)
+
+
+argp = argparse.ArgumentParser(description='Server for httpcli_test')
+argp.add_argument('-p', '--port', default=12345, type=int)
+argp.add_argument('-l', '--logfile', default=None, type=str)
+args = argp.parse_args()
+
+if args.logfile is not None:
+  sys.stdin.close()
+  sys.stderr.close()
+  sys.stdout.close()
+  sys.stderr = open(args.logfile, 'w')
+  sys.stdout = sys.stderr
+
+print 'port server running on port %d' % args.port
+
+pool = []
+in_use = {}
+
+
+def refill_pool(max_timeout, req):
+  """Scan for ports not marked for being in use"""
+  for i in range(1025, 32767):
+    if len(pool) > 100: break
+    if i in in_use:
+      age = time.time() - in_use[i]
+      if age < max_timeout:
+        continue
+      req.log_message("kill old request %d" % i)
+      del in_use[i]
+    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+    try:
+      s.bind(('localhost', i))
+      req.log_message("found available port %d" % i)
+      pool.append(i)
+    except:
+      pass # we really don't care about failures
+    finally:
+      s.close()
+
+
+def allocate_port(req):
+  global pool
+  global in_use
+  max_timeout = 600
+  while not pool:
+    refill_pool(max_timeout, req)
+    if not pool:
+      req.log_message("failed to find ports: retrying soon")
+      time.sleep(1)
+      max_timeout /= 2
+  port = pool[0]
+  pool = pool[1:]
+  in_use[port] = time.time()
+  return port
+
+
+keep_running = True
+
+
+class Handler(BaseHTTPServer.BaseHTTPRequestHandler):
+
+  def do_GET(self):
+    global keep_running
+    if self.path == '/get':
+      # allocate a new port, it will stay bound for ten minutes and until
+      # it's unused
+      self.send_response(200)
+      self.send_header('Content-Type', 'text/plain')
+      self.end_headers()
+      p = allocate_port(self)
+      self.log_message('allocated port %d' % p)
+      self.wfile.write('%d' % p)
+    elif self.path[0:6] == '/drop/':
+      self.send_response(200)
+      self.send_header('Content-Type', 'text/plain')
+      self.end_headers()
+      p = int(self.path[6:])
+      if p in in_use:
+        del in_use[p]
+        pool.append(p)
+        self.log_message('drop known port %d' % p)
+      else:
+        self.log_message('drop unknown port %d' % p)
+    elif self.path == '/version_number':
+      # fetch a version string and the current process pid
+      self.send_response(200)
+      self.send_header('Content-Type', 'text/plain')
+      self.end_headers()
+      self.wfile.write(_MY_VERSION)
+    elif self.path == '/dump':
+      # yaml module is not installed on Macs and Windows machines by default
+      # so we import it lazily (/dump action is only used for debugging)
+      import yaml
+      self.send_response(200)
+      self.send_header('Content-Type', 'text/plain')
+      self.end_headers()
+      now = time.time()
+      self.wfile.write(yaml.dump({'pool': pool, 'in_use': dict((k, now - v) for k, v in in_use.iteritems())}))
+    elif self.path == '/quitquitquit':
+      self.send_response(200)
+      self.end_headers()
+      keep_running = False
+
+
+httpd = BaseHTTPServer.HTTPServer(('', args.port), Handler)
+while keep_running:
+  httpd.handle_request()
+  sys.stderr.flush()
+
+print 'done'