Coverage for master/buildbot/changes/gerritchangesource : 55%

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# Copyright Buildbot Team Members 

from twisted.internet import reactor 

from buildbot.changes import base 

from buildbot.util import json 

from buildbot import util 

from twisted.python import log 

from twisted.internet import defer 

from twisted.internet.protocol import ProcessProtocol 

class GerritChangeSource(base.ChangeSource): 

    """This source will maintain a connection to gerrit ssh server 

    that will provide us gerrit events in json format.""" 

    compare_attrs = ["gerritserver", "gerritport"] 

    STREAM_GOOD_CONNECTION_TIME = 120 

    "(seconds) connections longer than this are considered good, and reset the backoff timer" 

    STREAM_BACKOFF_MIN = 0.5 

    "(seconds) minimum, but nonzero, time to wait before retrying a failed connection" 

    STREAM_BACKOFF_EXPONENT = 1.5 

    "multiplier used to increase the backoff from MIN to MAX on repeated failures" 

    STREAM_BACKOFF_MAX = 60 

    "(seconds) maximum time to wait before retrying a failed connection" 

    def __init__(self, gerritserver, username, gerritport=29418, identity_file=None): 

        """ 

        @type  gerritserver: string 

        @param gerritserver: the dns or ip that host the gerrit ssh server, 

        @type  gerritport: int 

        @param gerritport: the port of the gerrit ssh server, 

        @type  username: string 

        @param username: the username to use to connect to gerrit, 

        @type  identity_file: string 

        @param identity_file: identity file to for authentication (optional). 

        """ 

        # TODO: delete API comment when documented 

        self.gerritserver = gerritserver 

        self.gerritport = gerritport 

        self.username = username 

        self.identity_file = identity_file 

        self.process = None 

        self.wantProcess = False 

        self.streamProcessTimeout = self.STREAM_BACKOFF_MIN 

    class LocalPP(ProcessProtocol): 

        def __init__(self, change_source): 

            self.change_source = change_source 

            self.data = "" 

        @defer.inlineCallbacks 

        def outReceived(self, data): 

            """Do line buffering.""" 

            self.data += data 

            lines = self.data.split("\n") 

            self.data = lines.pop(-1) # last line is either empty or incomplete 

            for line in lines: 

                log.msg("gerrit: %s" % (line,)) 

                yield self.change_source.lineReceived(line) 

        def errReceived(self, data): 

            log.msg("gerrit stderr: %s" % (data,)) 

        def processEnded(self, status_object): 

            self.change_source.streamProcessStopped() 

    def lineReceived(self, line): 

        try: 

            event = json.loads(line.decode('utf-8')) 

        except ValueError: 

            log.msg("bad json line: %s" % (line,)) 

            return defer.succeed(None) 

        if not(type(event) == type({}) and "type" in event): 

            log.msg("no type in event %s" % (line,)) 

            return defer.succeed(None) 

        func = getattr(self, "eventReceived_"+event["type"].replace("-","_"), None) 

        if func == None: 

            log.msg("unsupported event %s" % (event["type"],)) 

            return defer.succeed(None) 

        # flatten the event dictionary, for easy access with WithProperties 

        def flatten(event, base, d): 

            for k, v in d.items(): 

                if type(v) == dict: 

                    flatten(event, base + "." + k, v) 

                else: # already there 

                    event[base + "." + k] = v 

        properties = {} 

        flatten(properties, "event", event) 

        return func(properties,event) 

    def addChange(self, chdict): 

        d = self.master.addChange(**chdict) 

        # eat failures.. 

        d.addErrback(log.err, 'error adding change from GerritChangeSource') 

        return d 

    def eventReceived_patchset_created(self, properties, event): 

        change = event["change"] 

        return self.addChange(dict( 

                author="%s <%s>" % (change["owner"]["name"], change["owner"]["email"]), 

                project=change["project"], 

                repository="ssh://%s@%s:%s/%s" % ( 

                    self.username, self.gerritserver, self.gerritport, change["project"]), 

                branch=change["branch"]+"/"+change["number"], 

                revision=event["patchSet"]["revision"], 

                revlink=change["url"], 

                comments=change["subject"], 

                files=["unknown"], 

                category=event["type"], 

                properties=properties)) 

    def eventReceived_ref_updated(self, properties, event): 

        ref = event["refUpdate"] 

        author = "gerrit" 

        if "submitter" in event: 

            author="%s <%s>" % (event["submitter"]["name"], event["submitter"]["email"]) 

        return self.addChange(dict( 

                author=author, 

                project=ref["project"], 

                repository="ssh://%s@%s:%s/%s" % ( 

                    self.username, self.gerritserver, self.gerritport, ref["project"]), 

                branch=ref["refName"], 

                revision=ref["newRev"], 

                comments="Gerrit: patchset(s) merged.", 

                files=["unknown"], 

                category=event["type"], 

                properties=properties)) 

    def streamProcessStopped(self): 

        self.process = None 

        # if the service is stopped, don't try to restart the process 

        if not self.wantProcess: 

            log.msg("service is not running; not reconnecting") 

            return 

        now = util.now() 

        if now - self.lastStreamProcessStart < self.STREAM_GOOD_CONNECTION_TIME: 

            # bad startup; start the stream process again after a timeout, and then 

            # increase the timeout 

            log.msg("'gerrit stream-events' failed; restarting after %ds" % round(self.streamProcessTimeout)) 

            reactor.callLater(self.streamProcessTimeout, self.startStreamProcess) 

            self.streamProcessTimeout *= self.STREAM_BACKOFF_EXPONENT 

            if self.streamProcessTimeout > self.STREAM_BACKOFF_MAX: 

                self.streamProcessTimeout = self.STREAM_BACKOFF_MAX 

        else: 

            # good startup, but lost connection; restart immediately, and set the timeout 

            # to its minimum 

            self.startStreamProcess() 

            self.streamProcessTimeout = self.STREAM_BACKOFF_MIN 

    def startStreamProcess(self): 

        log.msg("starting 'gerrit stream-events'") 

        self.lastStreamProcessStart = util.now() 

        args = [ self.username+"@"+self.gerritserver,"-p", str(self.gerritport)] 

        if self.identity_file is not None: 

          args = args + [ '-i', self.identity_file ] 

        self.process = reactor.spawnProcess(self.LocalPP(self), "ssh", 

          [ "ssh" ] + args + [ "gerrit", "stream-events" ]) 

    def startService(self): 

        self.wantProcess = True 

        self.startStreamProcess() 

    def stopService(self): 

        self.wantProcess = False 

        if self.process: 

            self.process.signalProcess("KILL") 

        # TODO: if this occurs while the process is restarting, some exceptions may 

        # be logged, although things will settle down normally 

        return base.ChangeSource.stopService(self) 

    def describe(self): 

        status = "" 

        if not self.process: 

            status = "[NOT CONNECTED - check log]" 

        str = ('GerritChangeSource watching the remote Gerrit repository %s@%s %s' % 

                            (self.username, self.gerritserver, status)) 

        return str