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path: root/gear/controller.py
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import gear
import sys
import json
import threading
import requests
import time
import signal
import urlparse
import distbuild
#TODO: values from settings
cache_server = 'http://cache.baserock.org:8080'

# Artifact build states. These are used to loosely track the state of the
# remote cache.
UNBUILT = 'not-built'
BUILDING = 'building'
BUILT = 'built'

import logging
logging.basicConfig()

gear.Server()

class SingleBuildController():
    def __init__(self, requests_controller, request_id):
        self.request_id = request_id
        self.requests_controller = requests_controller
        self.graph_client = BuildGraphClient(self)
        self.builder_client = BuilderClient(self)
        self.cache_client = CacheRequestClient(self)
        self.builder_client.addServer('localhost')
        self.builder_client.waitForServer()
        self.graph_client.addServer('localhost')
        self.graph_client.waitForServer()
        self.cache_client.addServer('localhost')
        self.cache_client.waitForServer()
        self.artifact = None
        self.build_started = False
        self.build_initiated = False

    def start_build(self, request, request_id):
        job = gear.Job("build-graph", request)
        self.graph_client.submitJob(job)
        self.request_id = request_id

    def _process_build_graph(self, build_graph):
        print "Decoding artifact received"
        try:
            self.artifact = distbuild.decode_artifact_reference(build_graph)
        except ValueError as e:
            print "ERROR: Failed to decode artifact"
            print "ERROR: === build graph start ==="
            print build_graph
            print "ERROR: === build graph end ==="
            raise e

        print "Decoding artifact received done"
        # Mark everything as unbuilt to begin with. We'll query the actua
        # state from the cache in self._query_cache_state().
        #TODO move to RQ
        def set_initial_state(artifact):
            artifact.state = UNBUILT
        print "Setting them as unbuilt"
        self._map_build_graph(self.artifact, set_initial_state)
        print "Setting them as unbuilt done"
        self.build_initiated = True
        self._check_cache_state()


    def _check_cache_state(self):
        print "DEBUG: checking cache..."

        # Check first building artifacts
        def mark_building_artifacts(artifact):
            if (artifact.state == UNBUILT and artifact.cache_key
                    in requests_controller.building_dict):
                artifact.state = BUILDING
                building_dict = requests_controller.building_dict
                cache_key = artifact.cache_key
                if (cache_key in building_dict and
                        not self.request_id in building_dict[cache_key]):
                    requests_controller.building_dict[
                        artifact.cache_key].append(self.request_id)

        with requests_controller.build_status_lock:
            self._map_build_graph(self.artifact, mark_building_artifacts)


        artifact_names = []
        def collect_unbuilt_artifacts(artifact):
            if artifact.state == UNBUILT:
                artifact_names.append(artifact.basename())
        with requests_controller.build_status_lock:
            self._map_build_graph(self.artifact, collect_unbuilt_artifacts)

        job = gear.Job("cache-request", json.dumps(artifact_names))
        self.cache_client.submitJob(job)


    def _process_cache_response(self, cache_response):
        response = json.loads( cache_response)

        # Mark things as built that are now built. We only check the unbuilt
        # artifacts, so 'cache_state' will have no info for things we already
        # thought were built.
        # TODO; move to RQ,
        def update_state(artifact):
            if artifact.state == UNBUILT:
                is_in_cache = response[artifact.basename()]
                if is_in_cache:
                    artifact.state = BUILT
        self._map_build_graph(self.artifact, update_state)
        # TODO: move to RQ
        self.build_started = True
        with requests_controller.lock_queue:
            requests_controller.lock_queue.notify()
            print "DEBUG: queque release!"

    def _map_build_graph(self, artifact, callback, components=[]):
        """Run callback on each artifact in the build graph and return result.

        If components is given, then only look at the components given and
        their dependencies. Also, return a list of the components after they
        have had callback called on them.

        """
        result = []
        mapped_components = []
        done = set()
        if components:
            queue = list(components)
        else:
            queue = [artifact]
        while queue:
            a = queue.pop()
            if a not in done:
                result.append(callback(a))
                queue.extend(a.dependencies)
                done.add(a)
                if a in components:
                    mapped_components.append(a)
        return result, mapped_components

    def find_artifacts_that_are_ready_to_build(self, root_artifact,
                                               components=[]):
        '''Return unbuilt artifacts whose dependencies are all built.

        The 'root_artifact' parameter is expected to be a tree of
        ArtifactReference objects. These must have the 'state' attribute set
        to BUILT or UNBUILT. If 'components' is passed, then only those
        artifacts and their dependencies will be built.

        '''
        def is_ready_to_build(artifact):
            # Just in case the state is not set yet.
            try:
                is_ready = (artifact.state == UNBUILT and
                            all(a.state == BUILT
                                for a in artifact.dependencies))
            except KeyError:
                is_ready = False
            return is_ready

        artifacts, _ = self._map_build_graph(root_artifact, lambda a: a,
                                   components)
        ready = [a for a in artifacts if is_ready_to_build(a)]
        return ready

    def _queue_worker_builds(self, artifacts):
        '''Send a set of chunks to the WorkerBuildQueuer class for building.'''
        print "starting"
        while len(artifacts) > 0:
            artifact = artifacts.pop()
            if artifact.kind == 'chunk':
                # Chunk artifacts are not built independently
                # so when we're building any chunk artifact
                # we're also building all the chunk artifacts
                # in this source
                same_chunk_artifacts = [a for a in artifacts
                    if a.cache_key == artifact.cache_key]
                for a in same_chunk_artifacts:
                    artifacts.remove(a)
            artifact_encoded = distbuild.encode_artifact_reference(artifact)
            # Make the build-artifact job use ARCHITECTURE to enable mutliarch
            # build network (TODO)
            job = gear.Job("build-artifact", artifact_encoded)
            self.builder_client.submitJob(job)
            self.requests_controller.mark_as_building(artifact.cache_key, job)

    def _find_artifacts(self, cache_key, name=None):
        artifacts, _ = self._map_build_graph(self.artifact, lambda a: a)
        if not name:
            return [a for a in artifacts if a.cache_key == cache_key]
        else:
            return [a for a in artifacts if a.cache_key == cache_key
                                         and a.name == name]
    def _mark_artifact_as_built(self, cache_key, name=None):
        self.requests_controller.mark_as_built(cache_key)


class CancelationClient(gear.Client):
    def __init__(self):
        super(CancelationClient, self).__init__()

    def handleWorkComplete(self, packet):
        job = super(CancelationClient, self).handleWorkComplete(packet)
        print "Cancelation workcomplete"
        return job


class CacheRequestClient(gear.Client):
    def __init__(self, controller):
        super(CacheRequestClient, self).__init__()
        self.controller = controller
        self.finished = False

    def handleWorkComplete(self, packet):
        job = super(CacheRequestClient, self).handleWorkComplete(packet)
        print "Cache workcomplete"
        self.controller._process_cache_response(job.data[-1])
        return job


class BuildGraphClient(gear.Client):
    def __init__(self, controller):
        super(BuildGraphClient, self).__init__()
        self.controller = controller
        self.finished = False

    def handleWorkComplete(self, packet):
        job = super(BuildGraphClient, self).handleWorkComplete(packet)
        print "Graph workcomplete"
        self.controller._process_build_graph(job.data[-1])
        return job

    def handleWorkData(self, packet):
        job = super(BuildGraphClient, self).handleWorkData(packet)
        print job.data[-1]
        job.data = []
        return job

    def handleWorkFail(self, packet):
        job = super(BuildGraphClient, self).handleWorkFail(packet)
        print "workfail"
        return job

    def handleWorkException(self, packet):
        job = super(BuildGraphClient, self).handleWorkException(packet)
        print "workexception"
        return job

    def handleDisconnect(self, job):
        job = super(BuildGraphClient, self).handleDisconnect(job)
        print "disconnect"



class BuilderClient(gear.Client):
    def __init__(self, controller):
        super(BuilderClient, self).__init__()
        self.controller = controller
        self.finished = False

    def handleWorkComplete(self, packet):
        job = super(BuilderClient, self).handleWorkComplete(packet)
        print "Build workcomplete"
        self.controller._mark_artifact_as_built(job.data[-1])
        return job

    # TODO: send different types of data? stdout, message...?
    # same for workFail, to identify worker dissconection and build
    # failures.
    def handleWorkData(self, packet):
        job = super(BuilderClient, self).handleWorkData(packet)
        #TODO: use cache_key to inform RQ to notify initiators later,
        # we need to note this cache_key somewhere
        #print job.data[-1].strip()
        # Cleanup previous data to speed up and save memory probably
        job.data = []
        return job

class RequestsController(threading.Thread):
    def __init__(self):
        super(RequestsController, self).__init__()
        self.building_dict = {}
        self.jobs_dict = {}
        self.next_id = 1
        self.new_request_lock = threading.Lock()
        self.lock_queue = threading.Condition()
        self.build_requests = []
        self.build_status_lock = threading.Lock()
        self.stopped = False
        self.cancel_client =  CancelationClient()
        self.cancel_client.addServer('localhost')
        self.cancel_client.waitForServer()

    def add_request(self, request, job=None):
        json_request = json.dumps(request)
        print "DEBUG: adding request - %s" % json_request
        request_data = {}
        with self.new_request_lock:
            request_data['id'] = self.next_id
            controller = SingleBuildController(self, self.next_id)
            # TODO: is this the right place to do this?
            controller.start_build(json_request, self.next_id)
            request_data['controller'] = controller
            request_data['request'] = request
            request_data['job'] = job
            self.next_id += 1
        self.build_requests.append(request_data)

    def queue_if_possible(self):
        print "DEBUG: Looking for jobs to queue"
        for request in self.build_requests:
            print request['id']
            controller = request['controller']
            if controller.artifact != None and controller.build_started == True:
                with self.build_status_lock:
                    to_build = controller.find_artifacts_that_are_ready_to_build(
                        controller.artifact)
                print to_build
                controller._queue_worker_builds(to_build)


    def mark_as_built(self, cache_key):
        with self.build_status_lock:
            print "DEBUG: marking as built %s" % cache_key
            # TODO, was it cancelled meanwhile??
            del self.building_dict[cache_key]
            del self.jobs_dict[cache_key]
            print self.building_dict
            for request in self.build_requests:
                controller = request['controller']
                if controller.artifact != None and controller.build_initiated == True:
                    artifacts = controller._find_artifacts(cache_key)
                    for artifact in artifacts:
                        artifact.state = BUILT
                        info = "TO %s: Artifact %s built" % (request['id'], artifact.name)
                        self.send_data_to_client(request['job'], info)
            print "finished setting as built"

        with self.lock_queue:
            self.lock_queue.notify()

    def send_data_to_client(self, job, msg):
        if job:
            job.sendWorkData(msg)
        print msg

    def mark_as_building(self, cache_key, job):
        with self.build_status_lock:
            print "DEBUG: marking as building %s" % cache_key
            requests_building = []
            print self.building_dict
            for request in self.build_requests:
                controller = request['controller']
                request_id = request['id']
                if controller.artifact != None and controller.build_initiated == True:
                    artifacts = controller._find_artifacts(cache_key)
                    for artifact in artifacts:
                        if not request_id in requests_building:
                            requests_building.append(request_id)
                        artifact.state = BUILDING
                        info = "TO %s: Artifact %s building" % (request['id'],artifact.name)
                        self.send_data_to_client(request['job'], info)
            self.building_dict[cache_key] = requests_building
            self.jobs_dict[cache_key] = job
            print "finished setting as building"

    def cancel_request(self, request_id_cancel):
        with self.build_status_lock:
            for request in self.build_requests:
                request_id = request['id']
                if request_id == request_id_cancel:
                    self.build_requests.remove(request)
                    controller = request['controller']
                    break
                return
            to_remove = []

            for cache_key, requests in self.building_dict.iteritems():
                print "DEBUG: cancelling  %s" % cache_key
                if requests == [request_id_cancel]:
                    job = self.jobs_dict[cache_key]
                    gear.CancelJobAdminRequest(job.handle)
                    to_remove.append(cache_key)


            for cache_key in to_remove:
                del self.building_dict[cache_key]
                del self.jobs_dict[cache_key]
                job = gear.Job("cancel-%s" % cache_key, cache_key)
                self.cancel_client.submitJob(job)
            print "Finished cancelling"


    def shutdown(self):
        self.stopped = True
        with self.lock_queue:
            self.lock_queue.notify()

    def run(self):
        while not self.stopped:
            with self.lock_queue:
                self.lock_queue.wait()
            if not self.stopped:
                self.queue_if_possible()


class RequestsManager(threading.Thread):
    def __init__(self, requests_controller):
        super(RequestsManager, self).__init__()
        self.requests_controller = requests_controller
        self.worker = gear.Worker('controller')
        self.worker.addServer('localhost')
        self.worker.registerFunction("build-request")
        self.stopped = False

    def run(self):
        while not self.stopped:
            try:
                print "DEBUG: Waiting for job"
                job = self.worker.getJob()
                self._handle_job(job)
            except gear.InterruptedError:
                print 'We were asked to stop waiting for jobs'

    def shutdown(self):
        self.stopped = True
        self.worker.stopWaitingForJobs()

    def _handle_job(self, job):
        build_request=json.loads(job.arguments)
        self.requests_controller.add_request(build_request, job)

request = {}
request['repo'] = "baserock:baserock/definitions"
request['ref'] = "fbce45e45da79e5c35341845ec3b3d7c321e6ff2"
request['system'] = "systems/minimal-system-x86_64-generic.morph"

# Command line
requests_controller = RequestsController()
requests_manager = RequestsManager(requests_controller)

def term_handler(signum, frame):
    requests_manager.shutdown()
    requests_controller.shutdown()
signal.signal(signal.SIGTERM, term_handler)

requests_controller.start()
requests_manager.start()

time.sleep(15)
print "START CANCELATION"
requests_controller.cancel_request(1)

while not requests_controller.stopped:
    try:
        time.sleep(3)
    except KeyboardInterrupt:
        print "Ctrl + C: asking tasks to exit nicely...\n"
        requests_manager.shutdown()
        requests_controller.shutdown()