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rest.py
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rest.py
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#
# ICRAR - International Centre for Radio Astronomy Research
# (c) UWA - The University of Western Australia, 2015
# Copyright by UWA (in the framework of the ICRAR)
# All rights reserved
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston,
# MA 02111-1307 USA
#
"""
Module containing the REST layer that exposes the methods of the different
Data Managers (DROPManager and DataIslandManager) to the outside world.
"""
import cgi
from email.message import Message
import functools
import io
import json
import logging
import os
import re
import tarfile
import threading
import bottle
import pkg_resources
from bottle import static_file
from dlg import constants
from .client import NodeManagerClient, DataIslandManagerClient
from .. import utils
from ..exceptions import (
InvalidGraphException,
InvalidSessionState,
DaliugeException,
NoSessionException,
SessionAlreadyExistsException,
InvalidDropException,
InvalidRelationshipException,
SubManagerException,
)
from ..restserver import RestServer
from ..restutils import RestClient, RestClientException
from .session import generateLogFileName
from dlg.common.deployment_methods import DeploymentMethods
logger = logging.getLogger(__name__)
def file_as_string(fname, enc="utf8"):
b = pkg_resources.resource_string(__name__, fname) # @UndefinedVariable
return utils.b2s(b, enc)
def daliuge_aware(func):
@functools.wraps(func)
def fwrapper(*args, **kwargs):
try:
res = func(*args, **kwargs)
if isinstance(res, (bytes, bottle.HTTPResponse)):
return res
if res is not None:
# set CORS headers
origin = bottle.request.headers.raw("Origin")
# logger.debug("CORS request comming from: %s", origin)
# logger.debug("Request method: %s", bottle.request.method)
if origin is None or re.match(
r"(http://dlg-trans.local:80[0-9][0-9]|https://dlg-trans.icrar.org)",
origin,
):
pass
elif re.match(r"http://((localhost)|(127.0.0.1)):80[0-9][0-9]", origin):
origin = "http://localhost:8084"
bottle.response.headers["Access-Control-Allow-Origin"] = origin
bottle.response.headers["Access-Control-Allow-Credentials"] = "true"
bottle.response.headers["Access-Control-Allow-Methods"] = (
"GET, POST, PUT, OPTIONS, HEAD"
)
bottle.response.headers["Access-Control-Allow-Headers"] = (
"Origin, Accept, Content-Type, Content-Encoding, X-Requested-With, X-CSRF-Token"
)
# logger.debug("CORS headers set to allow from: %s", origin)
bottle.response.content_type = "application/json"
# logger.debug("REST function called: %s", func.__name__)
jres = (
json.dumps(res)
if res is not None
else json.dumps({"Status": "Success"})
)
# logger.debug("Bottle sending back result: %s", jres[: min(len(jres), 80)])
return jres
except Exception as e:
logger.exception("Error while fulfilling request")
status, eargs = 500, ()
if isinstance(e, NotImplementedError):
status, eargs = 501, e.args
elif isinstance(e, NoSessionException):
status, eargs = 404, (e._session_id,)
elif isinstance(e, SessionAlreadyExistsException):
status, eargs = 409, (e._session_id,)
elif isinstance(e, InvalidDropException):
status, eargs = 409, ((e.oid, e.uid), e.reason)
elif isinstance(e, InvalidRelationshipException):
status, eargs = 409, (e.rel, e.reason)
elif isinstance(e, InvalidGraphException):
status, eargs = 400, e.args
elif isinstance(e, InvalidSessionState):
status, eargs = 400, e.args
elif isinstance(e, RestClientException):
status, eargs = 556, e.args
elif isinstance(e, SubManagerException):
status = 555
eargs = {}
# args[1] is a dictionary of host:exception
for host, subex in e.args[1].items():
logger.debug(">>>> Error class name: %s", subex.__class__.__name__)
eargs[host] = {
"type": subex.__class__.__name__,
# "args": subex.args,
"args": "dummy",
}
elif isinstance(e, DaliugeException):
status, eargs = 555, e.args
else:
raise
error = {"type": e.__class__.__name__, "args": eargs}
bottle.response.status = status
return json.dumps(error)
return fwrapper
class ManagerRestServer(RestServer):
"""
An object that wraps a DataManager and exposes its methods via a REST
interface. The server is started via the `start` method in a separate thread
and runs until the process is shut down.
This REST server currently also serves HTML pages in some of its methods
(i.e. those not under /api).
"""
def __init__(self, dm, maxreqsize=10):
super(ManagerRestServer, self).__init__()
# Increase maximum file sizes
bottle.BaseRequest.MEMFILE_MAX = maxreqsize * 1024 * 1024
self.dm = dm
# Mappings
app = self.app
app.get("/api/submission_method", callback=self.submit_methods)
app.post("/api/stop", callback=self.stop_manager)
app.post("/api/sessions", callback=self.createSession)
app.get("/api/sessions", callback=self.getSessions)
app.get("/api/sessions/<sessionId>", callback=self.getSessionInformation)
app.delete("/api/sessions/<sessionId>", callback=self.destroySession)
app.get("/api/sessions/<sessionId>/logs", callback=self.getLogFile)
app.get("/api/sessions/<sessionId>/status", callback=self.getSessionStatus)
app.post("/api/sessions/<sessionId>/deploy", callback=self.deploySession)
app.post("/api/sessions/<sessionId>/cancel", callback=self.cancelSession)
app.get("/api/sessions/<sessionId>/graph", callback=self.getGraph)
app.get("/api/sessions/<sessionId>/graph/size", callback=self.getGraphSize)
app.get(
"/api/sessions/<sessionId>/graph/status",
callback=self.getGraphStatus,
)
app.post(
"/api/sessions/<sessionId>/graph/append",
callback=self.addGraphParts,
)
app.get(
"/api/sessions/<sessionId>/repro/data",
callback=self.getSessionReproData,
)
app.get(
"/api/sessions/<sessionId>/repro/status",
callback=self.getSessionReproStatus,
)
app.route("/api/sessions", method="OPTIONS", callback=self.acceptPreflight)
app.route(
"/api/sessions/<sessionId>/graph/append",
method="OPTIONS",
callback=self.acceptPreflight2,
)
# The non-REST mappings that serve HTML-related content
app.route("/static/<filepath:path>", callback=self.server_static)
app.get("/session", callback=self.visualizeSession)
# sub-class specifics
self.initializeSpecifics(app)
def initializeSpecifics(self, app):
"""
Methods through which subclasses can initialize other mappings on top of
the default ones and perform other DataManager-specific actions.
The default implementation does nothing.
"""
@daliuge_aware
def submit_methods(self):
return {"methods": [DeploymentMethods.BROWSER, DeploymentMethods.SERVER]}
def _stop_manager(self):
self.dm.shutdown()
self.stop()
logger.info(
"Thanks for using our %s, come back again :-)",
self.dm.__class__.__name__,
)
@daliuge_aware
def stop_manager(self):
threading.Thread(target=self._stop_manager).start()
@daliuge_aware
def createSession(self):
newSession = bottle.request.json
sessionId = newSession["sessionId"]
self.dm.createSession(sessionId)
return {"sessionId": sessionId}
@daliuge_aware
def acceptPreflight(self):
return {}
@daliuge_aware
def acceptPreflight2(self, sessionId):
return {}
def sessions(self):
sessions = []
for sessionId in self.dm.getSessionIds():
sessions.append(
{
"sessionId": sessionId,
"status": self.dm.getSessionStatus(sessionId),
"size": self.dm.getGraphSize(sessionId),
}
)
return sessions
@daliuge_aware
def getSessions(self):
return self.sessions()
@daliuge_aware
def getSessionInformation(self, sessionId):
status = self.dm.getSessionStatus(sessionId)
try:
graphDict = self.dm.getGraph(sessionId)
except: # Pristine state sessions don't have a graph, yet.
graphDict = {}
status = 0
return {"status": status, "graph": graphDict}
@daliuge_aware
def getSessionReproStatus(self, sessionId):
return self.dm.getSessionReproStatus(sessionId)
@daliuge_aware
def getSessionsReproStatus(self):
sessions = []
for sessionId in self.dm.getSessionIds():
sessions.append(
{
"sessionId": sessionId,
"status": self.dm.getSessionStatus(sessionId),
"size": self.dm.getGraphSize(sessionId),
"repro": self.dm.getSessionReproStatus(sessionId),
}
)
return sessions
@daliuge_aware
def getSessionReproData(self, sessionId):
# For now, we only have information on a per-graph basis.
graphDict = self.dm.getGraph(sessionId)
reprodata = self.dm.getGraphReproData(sessionId)
return {"graph": graphDict, "reprodata": reprodata}
@daliuge_aware
def destroySession(self, sessionId):
self.dm.destroySession(sessionId)
@daliuge_aware
def getSessionStatus(self, sessionId):
return self.dm.getSessionStatus(sessionId)
@daliuge_aware
def deploySession(self, sessionId):
completedDrops = []
if "completed" in bottle.request.forms:
completedDrops = bottle.request.forms["completed"].split(",")
return self.dm.deploySession(sessionId, completedDrops=completedDrops)
# return {"Status": "Success"}
@daliuge_aware
def cancelSession(self, sessionId):
self.dm.cancelSession(sessionId)
@daliuge_aware
def getGraph(self, sessionId):
return self.dm.getGraph(sessionId)
@daliuge_aware
def getGraphSize(self, sessionId):
return self.dm.getGraphSize(sessionId)
@daliuge_aware
def getGraphStatus(self, sessionId):
return self.dm.getGraphStatus(sessionId)
# TODO: addGraphParts v/s addGraphSpec
@daliuge_aware
def addGraphParts(self, sessionId):
# WARNING: TODO: Somehow, the content_type can be overwritten to 'text/plain'
logger.debug("Graph content type: %s", bottle.request.content_type)
if (
"application/json" not in bottle.request.content_type
and "text/plain" not in bottle.request.content_type
):
bottle.response.status = 415
return
# We also accept gzipped content
hdrs = bottle.request.headers
logger.debug("Graph hdr: %s", {k: v for k, v in hdrs.items()})
if hdrs.get("Content-Encoding", None) == "gzip":
json_content = utils.ZlibUncompressedStream(bottle.request.body)
else:
json_content = bottle.request.body
graph_parts = bottle.json_loads(json_content.read())
return self.dm.addGraphSpec(sessionId, graph_parts)
# return {"graph_parts": graph_parts}
# ===========================================================================
# non-REST methods
# ===========================================================================
def server_static(self, filepath):
staticRoot = pkg_resources.resource_filename(
__name__, "/web/static"
) # @UndefinedVariable
return bottle.static_file(filepath, root=staticRoot)
def visualizeSession(self):
params = bottle.request.params
sessionId = params["sessionId"] if "sessionId" in params else ""
selectedNode = params["node"] if "node" in params else ""
viewMode = params["view"] if "view" in params else ""
tpl = file_as_string("web/session.html")
urlparts = bottle.request.urlparts
serverUrl = urlparts.scheme + "://" + urlparts.netloc
return bottle.template(
tpl,
sessionId=sessionId,
selectedNode=selectedNode,
viewMode=viewMode,
serverUrl=serverUrl,
dmType=self.dm.__class__.__name__,
)
class NMRestServer(ManagerRestServer):
"""
A REST server for NodeManagers. It includes mappings for NM-specific
methods and the mapping for the main visualization HTML pages.
"""
def initializeSpecifics(self, app):
app.get("/api", callback=self.getNMStatus)
app.post(
"/api/sessions/<sessionId>/graph/link",
callback=self.linkGraphParts,
)
app.post(
"/api/sessions/<sessionId>/subscriptions",
callback=self.add_node_subscriptions,
)
app.post("/api/sessions/<sessionId>/trigger", callback=self.trigger_drops)
# The non-REST mappings that serve HTML-related content
app.get("/", callback=self.visualizeDM)
app.get("/api/shutdown", callback=self.shutdown_node_manager)
@daliuge_aware
def shutdown_node_manager(self):
logger.debug("Shutting down node manager")
self.dm.shutdown()
@daliuge_aware
def getNMStatus(self):
# we currently return the sessionIds, more things might be added in the
# future
logger.debug("NM REST call: status")
return {"sessions": self.sessions()}
@daliuge_aware
def getLogFile(self, sessionId):
logger.debug("NM REST call: logfile")
logdir = self.dm.getLogDir()
logfile = generateLogFileName(logdir, sessionId)
if not os.path.isfile(logfile):
raise NoSessionException(sessionId, "Log file not found.")
return static_file(
os.path.basename(logfile),
root=logdir,
download=os.path.basename(logfile),
)
@daliuge_aware
def linkGraphParts(self, sessionId):
logger.debug("NM REST call: graph/link")
params = bottle.request.params
lhOID = params["lhOID"]
rhOID = params["rhOID"]
linkType = int(params["linkType"])
self.dm.linkGraphParts(sessionId, lhOID, rhOID, linkType)
@daliuge_aware
def add_node_subscriptions(self, sessionId):
logger.debug("NM REST call: add_subscriptions %s", bottle.request.json)
if bottle.request.content_type != "application/json":
bottle.response.status = 415
return
self.dm.add_node_subscriptions(sessionId, bottle.request.json)
@daliuge_aware
def trigger_drops(self, sessionId):
if bottle.request.content_type != "application/json":
bottle.response.status = 415
return
self.dm.trigger_drops(sessionId, bottle.request.json)
# ===========================================================================
# non-REST methods
# ===========================================================================
def visualizeDM(self):
tpl = file_as_string("web/dm.html")
urlparts = bottle.request.urlparts
serverUrl = urlparts.scheme + "://" + urlparts.netloc
return bottle.template(
tpl,
serverUrl=serverUrl,
dmType=self.dm.__class__.__name__,
reset="false",
)
class CompositeManagerRestServer(ManagerRestServer):
"""
A REST server for DataIslandManagers. It includes mappings for DIM-specific
methods.
"""
def initializeSpecifics(self, app):
app.get("/api", callback=self.getCMStatus)
app.get("/api/nodes", callback=self.getCMNodes)
app.post("/api/node/<node>", callback=self.addCMNode)
app.delete("/api/node/<node>", callback=self.removeCMNode)
# Query forwarding to sub-nodes
app.get("/api/node/<node>/sessions", callback=self.getNodeSessions)
app.get(
"/api/node/<node>/sessions/<sessionId>",
callback=self.getNodeSessionInformation,
)
app.get(
"/api/node/<node>/sessions/<sessionId>/status",
callback=self.getNodeSessionStatus,
)
app.get(
"/api/node/<node>/sessions/<sessionId>/graph",
callback=self.getNodeGraph,
)
app.get(
"/api/node/<node>/sessions/<sessionId>/graph/status",
callback=self.getNodeGraphStatus,
)
# The non-REST mappings that serve HTML-related content
app.get("/", callback=self.visualizeDIM)
@daliuge_aware
def getCMStatus(self):
return {
"hosts": self.dm.dmHosts,
"sessionIds": self.dm.getSessionIds(),
}
@daliuge_aware
def getCMNodes(self):
return self.dm.nodes
def getAllCMNodes(self):
return self.dm.nodes
@daliuge_aware
def addCMNode(self, node):
logger.debug("Adding node %s", node)
self.dm.add_node(node)
@daliuge_aware
def removeCMNode(self, node):
logger.debug("Removing node %s", node)
self.dm.remove_node(node)
@daliuge_aware
def getNodeSessions(self, node):
port = None
if node not in self.dm.nodes:
raise Exception(f"{node} not in current list of nodes")
if node.find(":") > 0:
node, port = node.split(":")
with NodeManagerClient(host=node, port=port) as dm:
return dm.sessions()
def _tarfile_write(self, tar, headers, stream):
file_header = headers.getheader("Content-Disposition")
length = headers.getheader("Content-Length")
m = Message()
m.add_header("content-disposition", file_header)
filename = m.get_params("filename")
# _, params = cgi.parse_header(file_header)
# filename = params["filename"]
info = tarfile.TarInfo(filename)
info.size = int(length)
content = []
while True:
buffer = stream.read()
if not buffer:
break
content.append(buffer)
tar.addfile(info, io.BytesIO(initial_bytes="".join(content).encode()))
@daliuge_aware
def getLogFile(self, sessionId):
fh = io.BytesIO()
with tarfile.open(fileobj=fh, mode="w:gz") as tar:
for node in self.getAllCMNodes():
node, port = node.split(":")
with NodeManagerClient(host=node, port=port) as dm:
try:
stream, resp = dm.get_log_file(sessionId)
self._tarfile_write(tar, resp, stream)
except NoSessionException:
pass
data = fh.getvalue()
size = len(data)
bottle.response.set_header("Content-type", "application/x-tar")
bottle.response["Content-Disposition"] = (
f"attachment; " f"filename=dlg_{sessionId}.tar"
)
bottle.response["Content-Length"] = size
return data
@daliuge_aware
def getNodeSessionInformation(self, node, sessionId):
if node not in self.dm.nodes:
raise Exception(f"{node} not in current list of nodes")
node, port = node.split(":")
with NodeManagerClient(host=node, port=port) as dm:
return dm.session(sessionId)
@daliuge_aware
def getNodeSessionStatus(self, node, sessionId):
if node not in self.dm.nodes:
raise Exception(f"{node} not in current list of nodes")
node, port = node.split(":")
with NodeManagerClient(host=node, port=port) as dm:
return dm.session_status(sessionId)
@daliuge_aware
def getNodeGraph(self, node, sessionId):
if node not in self.dm.nodes:
raise Exception(f"{node} not in current list of nodes")
node, port = node.split(":")
with NodeManagerClient(host=node, port=port) as dm:
return dm.graph(sessionId)
@daliuge_aware
def getNodeGraphStatus(self, node, sessionId):
if node not in self.dm.nodes:
raise Exception(f"{node} not in current list of nodes")
node, port = node.split(":")
with NodeManagerClient(host=node, port=port) as dm:
return dm.graph_status(sessionId)
# ===========================================================================
# non-REST methods
# ===========================================================================
def visualizeDIM(self):
tpl = file_as_string("web/dim.html")
urlparts = bottle.request.urlparts
selectedNode = (
bottle.request.params["node"] if "node" in bottle.request.params else ""
)
serverUrl = urlparts.scheme + "://" + urlparts.netloc
return bottle.template(
tpl,
dmType=self.dm.__class__.__name__,
dmPort=self.dm.dmPort,
serverUrl=serverUrl,
dmHosts=json.dumps(self.dm.dmHosts),
nodes=json.dumps(self.dm.nodes),
selectedNode=selectedNode,
)
class MasterManagerRestServer(CompositeManagerRestServer):
def initializeSpecifics(self, app):
CompositeManagerRestServer.initializeSpecifics(self, app)
# DIM manamagement
app.post("/api/island/<dim>", callback=self.addDIM)
app.delete("/api/island/<dim>", callback=self.removeDIM)
# Query forwarding to daemons
app.post("/api/managers/<host>/island", callback=self.createDataIsland)
app.post("/api/managers/<host>/node/start", callback=self.startNM)
app.post("/api/managers/<host>/node/stop", callback=self.stopNM)
# manage node manager assignment
app.post("/api/managers/<host>/node/<node>", callback=self.addNM)
app.delete("/api/managers/<host>/node/<node>", callback=self.removeNM)
# Querying about managers
app.get("/api/islands", callback=self.getDIMs)
app.get("/api/nodes", callback=self.getNMs)
app.get("/api/managers/<host>/node", callback=self.getNMInfo)
app.get("/api/managers/<host>/island", callback=self.getDIMInfo)
app.get("/api/managers/<host>/master", callback=self.getMMInfo)
@daliuge_aware
def createDataIsland(self, host):
with RestClient(
host=host, port=constants.DAEMON_DEFAULT_REST_PORT, timeout=10
) as c:
c._post_json("/managers/island/start", bottle.request.body.read())
self.dm.addDmHost(host)
return {"islands": self.dm.dmHosts}
@daliuge_aware
def getDIMs(self):
return {"islands": self.dm.dmHosts}
@daliuge_aware
def addDIM(self, dim):
logger.debug("Adding DIM %s", dim)
self.dm.addDmHost(dim)
@daliuge_aware
def removeDIM(self, dim):
logger.debug("Removing dim %s", dim)
self.dm.removeDmHost(dim)
@daliuge_aware
def getNMs(self):
return {"nodes": self.dm.nodes}
@daliuge_aware
def startNM(self, host):
port = constants.DAEMON_DEFAULT_REST_PORT
logger.debug("Sending NM start request to %s:%s", host, port)
with RestClient(host=host, port=port, timeout=10) as c:
return json.loads(c._POST("/managers/node/start").read())
@daliuge_aware
def stopNM(self, host):
port = constants.DAEMON_DEFAULT_REST_PORT
logger.debug("Sending NM stop request to %s:%s", host, port)
with RestClient(host=host, port=port, timeout=10) as c:
return json.loads(c._POST("/managers/node/stop").read())
@daliuge_aware
def addNM(self, host, node):
port = constants.ISLAND_DEFAULT_REST_PORT
logger.debug("Adding NM %s to DIM %s", node, host)
with RestClient(host=host, port=port, timeout=10, url_prefix="/api") as c:
return json.loads(
c._POST(
f"/node/{node}",
).read()
)
@daliuge_aware
def removeNM(self, host, node):
port = constants.ISLAND_DEFAULT_REST_PORT
logger.debug("Removing NM %s from DIM %s", node, host)
with RestClient(host=host, port=port, timeout=10, url_prefix="/api") as c:
return json.loads(c._DELETE(f"/node/{node}").read())
@daliuge_aware
def getNMInfo(self, host):
port = constants.DAEMON_DEFAULT_REST_PORT
logger.debug("Sending request %s:%s/managers/node", host, port)
with RestClient(host=host, port=port, timeout=10) as c:
return json.loads(c._GET("/managers/node").read())
@daliuge_aware
def getDIMInfo(self, host):
with RestClient(
host=host, port=constants.DAEMON_DEFAULT_REST_PORT, timeout=10
) as c:
return json.loads(c._GET("/managers/island").read())
@daliuge_aware
def getMMInfo(self, host):
with RestClient(
host=host, port=constants.DAEMON_DEFAULT_REST_PORT, timeout=10
) as c:
return json.loads(c._GET("/managers/master").read())
def getAllCMNodes(self):
nodes = []
for node in self.dm.dmHosts:
with DataIslandManagerClient(host=node) as dm:
nodes += dm.nodes()
return nodes