.

foo/server.py

Index: foo/server.py
diff --git a/foo/server.py b/foo/server.py
new file mode 100644
index 0000000000000000000000000000000000000000..1fcfc1dc0c973e576ca52eea20f82f2a65fe8534
--- /dev/null
+++ b/foo/server.py
@@ -0,0 +1,187 @@
+import argparse
+import collections
+import cherrypy
+import json
+import os
+import time
+
+genDelta = [
+  0,
+  10,
+  100,
+  1000,
+]
+
+genCount = 4
+maxGenLength = 5
+
+def cleanGeneration(gen, delta):
+  for i in range(len(gen) - 1):
+    if gen[i + 1]['time'] - gen[i]['time'] < delta:
+      e = gen.pop(i + 1)
+      os.remove(e['path'])
+      return None
+  return gen.pop(0)
+
+
+def cleanUpArchives(archives):
+  for i, gen in enumerate(archives):
+    if len(gen) > maxGenLength:
+      e = cleanGeneration(gen, genDelta[i])
+      if e:
+        if i + 1 < len(archives):
+          archives[i + 1].append(e)
+
+def printArchives(archives):
+  print '******'
+  for i in archives:
+    for e in i:
+      print e['time']
+    print '  --  '
+
+archiveIdx = 0
+def saveData(service):
+  global archiveIdx
+  archives = service.getArchives()
+  lastGeneration = archives[0]
+  lastSavedUpdate = -1
+  if len(lastGeneration) > 0:
+    lastSavedUpdate = lastGeneration[-1]['lastId']
+  lastUpdate = service.getLastUpdateId()
+  hasChanges = lastSavedUpdate < lastUpdate
+
+  if not hasChanges:
+    return
+
+  timeFormat = '%Y-%m-%e-%H:%M:%S'
+  currentTime = time.time()
+  path = os.path.join(service.getArchivePath(), 'archive-%s.json' % time.strftime(timeFormat))
+  with open(path, 'w') as outfile:
+    json.dump(service.getData(), outfile)
+  lastGeneration.append({
+    'lastId': lastUpdate,
+    'path': path,
+    'time': archiveIdx,
+    'realtime': currentTime,
+  })
+  archiveIdx += 1
+
+  cleanUpArchives(service.getArchives())
+
+class Service(object):
+  exposed = True
+
+  def __init__(self, data_dir):
+    self.data = None
+    self.updates = collections.deque(maxlen=500)
+    self.nextUpdateId = 0
+    self.idxMap = None
+    self.archive_path = os.path.join(data_dir, 'archive')
+    if not os.path.exists(self.archive_path):
+      os.makedirs(self.archive_path)
+    with open(os.path.join(data_dir, 'index')) as inf:
+      self.data = json.load(inf)
+      self.initIdxMap()
+
+    self.archives = []
+    for i in range(genCount):
+      self.archives.append([])
+
+    self.saver = cherrypy.process.plugins.BackgroundTask(2.0 * 60, saveData, [self])
+    self.saver.start()
+
+  def initIdxMap(self):
+    self.idxMap = dict()
+    for i, entry in enumerate(self.data):
+      self.idxMap[entry['url']] = i
+
+  def getArchivePath(self):
+    return self.archive_path
+
+  def getArchives(self):
+    return self.archives
+
+  def getData(self):
+    return self.data
+
+  def getDataResponse(self):
+    return {
+      'data': self.data,
+      'nextId': self.nextUpdateId,
+    }
+
+  def appendUpdate(self, entry, idx):
+    self.updates.append({'index': idx, 'id': self.nextUpdateId, 'entry': entry})
+    self.nextUpdateId += 1
+
+  def update(self, entry):
+    key = entry['url']
+    idx = self.idxMap[key]
+    self.data[idx] = entry
+    self.appendUpdate(entry, idx)
+    return 'sdf'
+
+  @cherrypy.expose
+  def getupdates(self, nextId):
+    data = None
+    updates = None
+    nextId = int(nextId)
+    newNextId = nextId
+
+    if len(self.updates) > 0:
+      lastId = self.updates[-1]['id']
+      firstId = self.updates[0]['id']
+      if firstId > nextId:
+        data = self.data
+      elif lastId >= nextId:
+        updates = list(self.updates)[nextId - firstId:]
+      newNextId = lastId + 1
+    return json.dumps({'response': {
+      'data': data,
+      'updates': updates,
+      'nextId': newNextId,
+    }})
+
+
+  @cherrypy.expose
+  def message(self):
+    cl = cherrypy.request.headers['Content-Length']
+    rawbody = cherrypy.request.body.read(int(cl))
+    request = json.loads(rawbody)
+    action = request['action']
+    response = None
+    if action == 'getData':
+      response = self.getDataResponse()
+    if action == 'update':
+      response = self.update(request['data'])
+    return json.dumps({'response': response})
+
+  def getLastUpdateId(self):
+    return self.nextUpdateId - 1
+
+
+
+if __name__ == '__main__':
+  parser = argparse.ArgumentParser()
+  parser.add_argument('--data-dir')
+  options = parser.parse_args()
+  service = Service(options.data_dir)
+  conf = {
+    'global': {
+      'server.socket_host': '0.0.0.0',
+      'server.socket_port': 8081,
+    },
+    '/': {
+      'tools.response_headers.on': True,
+      'tools.response_headers.headers': [('Content-Type', 'text/plain')],
+    },
+    '/foo': {
+      'tools.staticdir.on': True,
+      'tools.staticdir.dir': '/usr/local/google/code/dom_distiller/foo',
+    },
+    '/images': {
+      'tools.staticdir.on': True,
+      'tools.staticdir.dir': os.path.join(os.getcwd(), options.data_dir),
+    }
+  }
+  cherrypy.quickstart(service, '/', conf)