58 lines
1.9 KiB
Go
58 lines
1.9 KiB
Go
// Copyright 2015 CoreOS, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package dbus
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import (
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"time"
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)
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// SubscriptionSet returns a subscription set which is like conn.Subscribe but
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// can filter to only return events for a set of units.
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type SubscriptionSet struct {
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*set
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conn *Conn
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}
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func (s *SubscriptionSet) filter(unit string) bool {
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return !s.Contains(unit)
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}
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// Subscribe starts listening for dbus events for all of the units in the set.
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// Returns channels identical to conn.SubscribeUnits.
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func (s *SubscriptionSet) Subscribe() (<-chan map[string]*UnitStatus, <-chan error) {
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// TODO: Make fully evented by using systemd 209 with properties changed values
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return s.conn.SubscribeUnitsCustom(time.Second, 0,
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mismatchUnitStatus,
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func(unit string) bool { return s.filter(unit) },
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)
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}
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// NewSubscriptionSet returns a new subscription set.
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func (conn *Conn) NewSubscriptionSet() *SubscriptionSet {
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return &SubscriptionSet{newSet(), conn}
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}
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// mismatchUnitStatus returns true if the provided UnitStatus objects
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// are not equivalent. false is returned if the objects are equivalent.
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// Only the Name, Description and state-related fields are used in
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// the comparison.
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func mismatchUnitStatus(u1, u2 *UnitStatus) bool {
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return u1.Name != u2.Name ||
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u1.Description != u2.Description ||
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u1.LoadState != u2.LoadState ||
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u1.ActiveState != u2.ActiveState ||
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u1.SubState != u2.SubState
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}
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