/lib/rapi/resources.py - ganeti-local - Greek Research and Technology Network's projects

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+      #
+      #
       # Copyright (C) 2006, 2007, 2008 Google Inc.
+      #
       # This program is free software; you can redistribute it and/or modify
       # it under the terms of the GNU General Public License as published by
       # the Free Software Foundation; either version 2 of the License, or
       # (at your option) any later version.
+      #
       # This program is distributed in the hope that it will be useful, but
       # WITHOUT ANY WARRANTY; without even the implied warranty of
       # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
       # General Public License for more details.
+      #
       # You should have received a copy of the GNU General Public License
       # along with this program; if not, write to the Free Software
       # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
       # 02110-1301, USA.
       """Remote API resources.
       """
       import cgi
       import re
       import ganeti.opcodes
       import ganeti.errors
       import ganeti.cli
       from ganeti import constants
       from ganeti import utils
       from ganeti.rapi import httperror
       # Initialized at the end of this file.
       _CONNECTOR = {}
       def BuildUriList(names, uri_format):
         """Builds a URI list as used by index resources.
         Args:
         - names: List of names as strings
         - uri_format: Format to be applied for URI
         """
         def _MapName(name):
           return { "name": name, "uri": uri_format % name, }
         # Make sure the result is sorted, makes it nicer to look at and simplifies
         # unittests.
         names.sort()
         return map(_MapName, names)
       def ExtractField(sequence, index):
         """Creates a list containing one column out of a list of lists.
         Args:
         - sequence: Sequence of lists
         - index: Index of field
         """
         return map(lambda item: item[index], sequence)
       def MapFields(names, data):
         """Maps two lists into one dictionary.
         Args:
         - names: Field names (list of strings)
         - data: Field data (list)
         Example:
         >>> MapFields(["a", "b"], ["foo", 123])
         {'a': 'foo', 'b': 123}
         """
         if len(names) != len(data):
           raise AttributeError("Names and data must have the same length")
         return dict([(names[i], data[i]) for i in range(len(names))])
       def RequireLock(name='cmd'):
         """Function decorator to automatically acquire locks.
         PEP-318 style function decorator.
         """
         def wrapper(fn):
           def new_f(*args, **kwargs):
             try:
               utils.Lock(name, max_retries=15)
               try:
                 # Call real function
                 return fn(*args, **kwargs)
               finally:
                 utils.Unlock(name)
                 utils.LockCleanup()
             except ganeti.errors.LockError, err:
               raise httperror.HTTPServiceUnavailable(message=str(err))
           # Override function metadata
           new_f.func_name = fn.func_name
           new_f.func_doc = fn.func_doc
           return new_f
         return wrapper
       def _Tags_GET(kind, name=None):
         """Helper function to retrieve tags.
         """
         if name is None:
           # Do not cause "missing parameter" error, which happens if a parameter
           # is None.
           name = ""
         op = ganeti.opcodes.OpGetTags(kind=kind, name=name)
         tags = ganeti.cli.SubmitOpCode(op)
         return list(tags)
       class Mapper:
         """Map resource to method.
         """
         def __init__(self, connector=_CONNECTOR):
           """Resource mapper constructor.
           Args:
             con: a dictionary, mapping method name with URL path regexp
           """
           self._connector = connector
         def getController(self, uri):
           """Find method for a given URI.
           Args:
             uri: string with URI
           Returns:
             None if no method is found or a tuple containing the following fields:
               methd: name of method mapped to URI
               items: a list of variable intems in the path
               args: a dictionary with additional parameters from URL
           """
           if '?' in uri:
             (path, query) = uri.split('?', 1)
             args = cgi.parse_qs(query)
           else:
             path = uri
             query = None
             args = {}
           result = None
           for key, handler in self._connector.iteritems():
             # Regex objects
             if hasattr(key, "match"):
               m = key.match(path)
               if m:
                 result = (handler, list(m.groups()), args)
                 break
             # String objects
             elif key == path:
               result = (handler, [], args)
               break
           if result is not None:
             return result
           else:
             raise httperror.HTTPNotFound()
       class R_Generic(object):
         """Generic class for resources.
         """
         def __init__(self, request, items, queryargs):
           """Generic resource constructor.
           Args:
             request: HTTPRequestHandler object
             items: a list with variables encoded in the URL
             queryargs: a dictionary with additional options from URL
           """
           self.request = request
           self.items = items
           self.queryargs = queryargs
       class R_root(R_Generic):
         """/ resource.
         """
         DOC_URI = "/"
         def GET(self):
           """Show the list of mapped resources.
           Returns:
             A dictionary with 'name' and 'uri' keys for each of them.
           """
           root_pattern = re.compile('^R_([a-zA-Z0-9]+)$')
           rootlist = []
           for handler in _CONNECTOR.values():
             m = root_pattern.match(handler.__name__)
             if m:
               name = m.group(1)
               if name != 'root':
                 rootlist.append(name)
           return BuildUriList(rootlist, "/%s")
       class R_version(R_Generic):
         """/version resource.
         This resource should be used to determine the remote API version and to adapt
         clients accordingly.
         """
         DOC_URI = "/version"
         def GET(self):
           """Returns the remote API version.
           """
           return constants.RAPI_VERSION
       class R_tags(R_Generic):
         """/tags resource.
         Manages cluster tags.
         """
         DOC_URI = "/tags"
         def GET(self):
           """Returns a list of all cluster tags.
           Example: ["tag1", "tag2", "tag3"]
           """
           return _Tags_GET(constants.TAG_CLUSTER)
       class R_info(R_Generic):
         """Cluster info.
         """
         DOC_URI = "/info"
         def GET(self):
           """Returns cluster information.
           Example: {
             "config_version": 3,
             "name": "cluster1.example.com",
             "software_version": "1.2.4",
             "os_api_version": 5,
             "export_version": 0,
             "master": "node1.example.com",
             "architecture": [
               "64bit",
               "x86_64"
             ],
             "hypervisor_type": "xen-3.0",
             "protocol_version": 12
+          }
           """
           op = ganeti.opcodes.OpQueryClusterInfo()
           return ganeti.cli.SubmitOpCode(op)
       class R_nodes(R_Generic):
         """/nodes resource.
         """
         DOC_URI = "/nodes"
         @RequireLock()
         def _GetDetails(self, nodeslist):
           """Returns detailed instance data for bulk output.
           Args:
             instance: A list of nodes names.
           Returns:
             A list of nodes properties
           """
           fields = ["name","dtotal", "dfree",
                     "mtotal", "mnode", "mfree",
                     "pinst_cnt", "sinst_cnt", "tags"]
           op = ganeti.opcodes.OpQueryNodes(output_fields=fields,
                                            names=nodeslist)
           result = ganeti.cli.SubmitOpCode(op)
           nodes_details = []
           for node in result:
             mapped = MapFields(fields, node)
             nodes_details.append(mapped)
           return nodes_details
         def GET(self):
           """Returns a list of all nodes.
           Returns:
             A dictionary with 'name' and 'uri' keys for each of them.
           Example: [
+              {
                 "name": "node1.example.com",
                 "uri": "\/instances\/node1.example.com"
               },
+              {
                 "name": "node2.example.com",
                 "uri": "\/instances\/node2.example.com"
               }]
           If the optional 'bulk' argument is provided and set to 'true'
           value (i.e '?bulk=1'), the output contains detailed
           information about nodes as a list. Note: Lock required.
           Example: [
+              {
                 "pinst_cnt": 1,
                 "mfree": 31280,
                 "mtotal": 32763,
                 "name": "www.example.com",
                 "tags": [],
                 "mnode": 512,
                 "dtotal": 5246208,
                 "sinst_cnt": 2,
                 "dfree": 5171712
               },
               ...
+          ]
           """
           op = ganeti.opcodes.OpQueryNodes(output_fields=["name"], names=[])
           nodeslist = ExtractField(ganeti.cli.SubmitOpCode(op), 0)
           if 'bulk' in self.queryargs:
             return self._GetDetails(nodeslist)
           return BuildUriList(nodeslist, "/nodes/%s")
       class R_nodes_name(R_Generic):
         """/nodes/[node_name] resources.
         """
         DOC_URI = "/nodes/[node_name]"
         @RequireLock()
         def GET(self):
           """Send information about a node.
           """
           node_name = self.items[0]
           fields = ["name","dtotal", "dfree",
                     "mtotal", "mnode", "mfree",
                     "pinst_cnt", "sinst_cnt", "tags"]
           op = ganeti.opcodes.OpQueryNodes(output_fields=fields,
                                            names=[node_name])
           result = ganeti.cli.SubmitOpCode(op)
           return MapFields(fields, result[0])
       class R_nodes_name_tags(R_Generic):
         """/nodes/[node_name]/tags resource.
         Manages per-node tags.
         """
         DOC_URI = "/nodes/[node_name]/tags"
         def GET(self):
           """Returns a list of node tags.
           Example: ["tag1", "tag2", "tag3"]
           """
           return _Tags_GET(constants.TAG_NODE, name=self.items[0])
       class R_instances(R_Generic):
         """/instances resource.
         """
         DOC_URI = "/instances"
         @RequireLock()
         def _GetDetails(self, instanceslist):
           """Returns detailed instance data for bulk output.
           Args:
             instance: A list of instances names.
           Returns:
             A list with instances properties.
           """
           fields = ["name", "os", "pnode", "snodes",
                     "admin_state", "admin_ram",
                     "disk_template", "ip", "mac", "bridge",
                     "sda_size", "sdb_size", "vcpus",
                     "oper_state", "status", "tags"]
           op = ganeti.opcodes.OpQueryInstances(output_fields=fields,
                                                names=instanceslist)
           result = ganeti.cli.SubmitOpCode(op)
           instances_details = []
           for instance in result:
             mapped = MapFields(fields, instance)
             instances_details.append(mapped)
           return instances_details
         def GET(self):
           """Returns a list of all available instances.
           Returns:
              A dictionary with 'name' and 'uri' keys for each of them.
           Example: [
+              {
                 "name": "web.example.com",
                 "uri": "\/instances\/web.example.com"
               },
+              {
                 "name": "mail.example.com",
                 "uri": "\/instances\/mail.example.com"
               }]
           If the optional 'bulk' argument is provided and set to 'true'
           value (i.e '?bulk=1'), the output contains detailed
           information about instances as a list. Note: Lock required.
           Example: [
+              {
                  "status": "running",
                  "bridge": "xen-br0",
                  "name": "web.example.com",
                  "tags": ["tag1", "tag2"],
                  "admin_ram": 512,
                  "sda_size": 20480,
                  "pnode": "node1.example.com",
                  "mac": "01:23:45:67:89:01",
                  "sdb_size": 4096,
                  "snodes": ["node2.example.com"],
                  "disk_template": "drbd",
                  "ip": null,
                  "admin_state": true,
                  "os": "debian-etch",
                  "vcpus": 2,
                  "oper_state": true
               },
               ...
+          ]
           """
           op = ganeti.opcodes.OpQueryInstances(output_fields=["name"], names=[])
           instanceslist = ExtractField(ganeti.cli.SubmitOpCode(op), 0)
           if 'bulk' in self.queryargs:
             return self._GetDetails(instanceslist)
           else:
             return BuildUriList(instanceslist, "/instances/%s")
       class R_instances_name(R_Generic):
         """/instances/[instance_name] resources.
         """
         DOC_URI = "/instances/[instance_name]"
         @RequireLock()
         def GET(self):
           """Send information about an instance.
           """
           instance_name = self.items[0]
           fields = ["name", "os", "pnode", "snodes",
                     "admin_state", "admin_ram",
                     "disk_template", "ip", "mac", "bridge",
                     "sda_size", "sdb_size", "vcpus",
                     "oper_state", "status", "tags"]
           op = ganeti.opcodes.OpQueryInstances(output_fields=fields,
                                                names=[instance_name])
           result = ganeti.cli.SubmitOpCode(op)
           return MapFields(fields, result[0])
       class R_instances_name_tags(R_Generic):
         """/instances/[instance_name]/tags resource.
         Manages per-instance tags.
         """
         DOC_URI = "/instances/[instance_name]/tags"
         def GET(self):
           """Returns a list of instance tags.
           Example: ["tag1", "tag2", "tag3"]
           """
           return _Tags_GET(constants.TAG_INSTANCE, name=self.items[0])
       class R_os(R_Generic):
         """/os resource.
         """
         DOC_URI = "/os"
         @RequireLock()
         def GET(self):
           """Return a list of all OSes.
           Can return error 500 in case of a problem.
           Example: ["debian-etch"]
           """
           op = ganeti.opcodes.OpDiagnoseOS(output_fields=["name", "valid"],
                                            names=[])
           diagnose_data = ganeti.cli.SubmitOpCode(op)
           if not isinstance(diagnose_data, list):
             raise httperror.HTTPInternalError(message="Can't get OS list")
           return [row[0] for row in diagnose_data if row[1]]
       _CONNECTOR.update({
         "/": R_root,
         "/version": R_version,
         "/tags": R_tags,
         "/info": R_info,
         "/nodes": R_nodes,
         re.compile(r'^/nodes/([\w\._-]+)$'): R_nodes_name,
         re.compile(r'^/nodes/([\w\._-]+)/tags$'): R_nodes_name_tags,
         "/instances": R_instances,
         re.compile(r'^/instances/([\w\._-]+)$'): R_instances_name,
         re.compile(r'^/instances/([\w\._-]+)/tags$'): R_instances_name_tags,
         "/os": R_os,
         })

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root / lib / rapi / resources.py @ e2212007