rwlaunchpad/plugins/rwpkgmgr/rift/tasklets/rwpkgmgr/rpc.py

   1 #
   2 #   Copyright 2016 RIFT.IO Inc
   3 #
   4 #   Licensed under the Apache License, Version 2.0 (the "License");
   5 #   you may not use this file except in compliance with the License.
   6 #   You may obtain a copy of the License at
   7 #
   8 #       http://www.apache.org/licenses/LICENSE-2.0
   9 #
  10 #   Unless required by applicable law or agreed to in writing, software
  11 #   distributed under the License is distributed on an "AS IS" BASIS,
  12 #   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13 #   See the License for the specific language governing permissions and
  14 #   limitations under the License.
  15 #
  16 # Author(s): Varun Prasad
  17 # Creation Date: 09/25/2016
  18 #
  19
  20 import abc
  21 import asyncio
  22 import tempfile
  23
  24 from gi.repository import (
  25    RwDts as rwdts,
  26    RwPkgMgmtYang)
  27 import rift.tasklets
  28 import rift.mano.dts as mano_dts
  29
  30 from . import downloader as pkg_downloader
  31
  32 # Shortcuts
  33 RPC_PKG_ENDPOINT = RwPkgMgmtYang.YangOutput_RwPkgMgmt_GetPackageEndpoint
  34 RPC_SCHEMA_ENDPOINT = RwPkgMgmtYang.YangOutput_RwPkgMgmt_GetPackageSchema
  35 RPC_PACKAGE_ADD_ENDPOINT = RwPkgMgmtYang.YangOutput_RwPkgMgmt_PackageFileAdd
  36 RPC_PACKAGE_DELETE_ENDPOINT = RwPkgMgmtYang.YangOutput_RwPkgMgmt_PackageFileDelete
  37
  38
  39 class EndpointDiscoveryRpcHandler(mano_dts.AbstractRpcHandler):
  40     """RPC handler to generate the endpoint for the Package manager."""
  41
  42     def __init__(self, log, dts, loop, proxy):
  43         """
  44         Args:
  45             proxy: Any impl of .proxy.AbstractPackageManagerProxy
  46         """
  47         super().__init__(log, dts, loop)
  48         self.proxy = proxy
  49
  50     @property
  51     def xpath(self):
  52         return "/rw-pkg-mgmt:get-package-endpoint"
  53
  54     @asyncio.coroutine
  55     def callback(self, ks_path, msg):
  56         """Forwards the request to proxy.
  57         """
  58         url = yield from self.proxy.endpoint(
  59                 msg.package_type,
  60                 msg.package_id)
  61
  62         rpc_op = RPC_PKG_ENDPOINT.from_dict({"endpoint": url})
  63
  64         return rpc_op
  65
  66
  67 class SchemaRpcHandler(mano_dts.AbstractRpcHandler):
  68     """RPC handler to generate the schema for the packages.
  69     """
  70     def __init__(self, log, dts, loop, proxy):
  71         """
  72         Args:
  73             proxy: Any impl of .proxy.AbstractPackageManagerProxy
  74         """
  75         super().__init__(log, dts, loop)
  76         self.proxy = proxy
  77
  78     @property
  79     def xpath(self):
  80         return "/rw-pkg-mgmt:get-package-schema"
  81
  82     @asyncio.coroutine
  83     def callback(self, ks_path, msg):
  84
  85         package_type = msg.package_type.lower()
  86         schema = yield from self.proxy.schema(msg.package_type)
  87
  88         rpc_op = RPC_SCHEMA_ENDPOINT()
  89         for dirname in schema:
  90             rpc_op.schema.append(dirname)
  91
  92         return rpc_op
  93
  94
  95 class PackageOperationsRpcHandler(mano_dts.AbstractRpcHandler):
  96     """File add RPC
  97
  98     Steps:
  99     1. For a request, we schedule a download in the background
 100     2. We register the downloader to a publisher to push out the download status
 101         Note: The publisher starts the download automatically.
 102     3. Return a tracking ID for the client to monitor the entire status
 103
 104     """
 105     def __init__(self, log, dts, loop, proxy, publisher):
 106         """
 107         Args:
 108             proxy: Any impl of .proxy.AbstractPackageManagerProxy
 109             publisher: Instance of DownloadStatusPublisher
 110         """
 111         super().__init__(log, dts, loop)
 112         self.proxy = proxy
 113         self.publisher = publisher
 114
 115     @property
 116     def xpath(self):
 117         return "/rw-pkg-mgmt:package-file-add"
 118
 119     @asyncio.coroutine
 120     def callback(self, ks_path, msg):
 121         if not msg.external_url:
 122             # For now we will only support External URL download
 123             raise Exception ("No download URL provided")
 124
 125         # Create a tmp file to download the url
 126         # We first store the data in temp and post download finish
 127         # we move the file to actual location.
 128         _, filename = tempfile.mkstemp()
 129
 130         auth = None
 131         if msg.username is not None:
 132             auth = (msg.username, msg.password)
 133
 134         url_downloader = pkg_downloader.PackageFileDownloader.from_rpc_input(
 135                 msg,
 136                 auth=auth,
 137                 file_obj=filename,
 138                 proxy=self.proxy,
 139                 log=self.log)
 140
 141         download_id = yield from self.publisher.register_downloader(url_downloader)
 142
 143         rpc_op = RPC_PACKAGE_ADD_ENDPOINT.from_dict({"task_id": download_id})
 144
 145         return rpc_op
 146
 147
 148 class PackageDeleteOperationsRpcHandler(mano_dts.AbstractRpcHandler):
 149     def __init__(self, log, dts, loop, proxy):
 150         """
 151         Args:
 152             proxy: Any impl of .proxy.AbstractPackageManagerProxy
 153         """
 154         super().__init__(log, dts, loop)
 155         self.proxy = proxy
 156
 157     @property
 158     def xpath(self):
 159         return "/rw-pkg-mgmt:package-file-delete"
 160
 161     @asyncio.coroutine
 162     def callback(self, ks_path, msg):
 163
 164         rpc_op = RPC_PACKAGE_DELETE_ENDPOINT.from_dict({"status": str(True)})
 165
 166         try:
 167             self.proxy.package_file_delete(
 168                 msg.package_type,
 169                 msg.package_id,
 170                 msg.package_path)
 171         except Exception as e:
 172             self.log.exception(e)
 173             rpc_op.status = str(False)
 174             rpc_op.error_trace = str(e)
 175
 176         return rpc_op