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94 lines
2.5 KiB
94 lines
2.5 KiB
// Copyright 2017 clair authors
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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 notification fetches notifications from the database and informs the
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// specified remote handler about their existences, inviting the third party to
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// actively query the API about it.
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// Package notification exposes functions to dynamically register methods to
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// deliver notifications from the Clair database.
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package notification
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import (
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"sync"
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"time"
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)
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var (
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sendersM sync.RWMutex
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senders = make(map[string]Sender)
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)
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// Config is the configuration for the Notifier service and its registered
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// notifiers.
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type Config struct {
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Attempts int
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RenotifyInterval time.Duration
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Params map[string]interface{} `yaml:",inline"`
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}
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// Sender represents anything that can transmit notifications.
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type Sender interface {
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// Configure attempts to initialize the notifier with the provided configuration.
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// It returns whether the notifier is enabled or not.
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Configure(*Config) (bool, error)
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// Send informs the existence of the specified notification.
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Send(notificationName string) error
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}
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// RegisterSender makes a Sender available by the provided name.
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//
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// If called twice with the same name, the name is blank, or if the provided
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// Sender is nil, this function panics.
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func RegisterSender(name string, s Sender) {
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if name == "" {
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panic("notification: could not register a Sender with an empty name")
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}
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if s == nil {
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panic("notification: could not register a nil Sender")
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}
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sendersM.Lock()
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defer sendersM.Unlock()
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if _, dup := senders[name]; dup {
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panic("notification: RegisterSender called twice for " + name)
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}
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senders[name] = s
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}
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// Senders returns the list of the registered Senders.
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func Senders() map[string]Sender {
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sendersM.RLock()
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defer sendersM.RUnlock()
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ret := make(map[string]Sender)
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for k, v := range senders {
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ret[k] = v
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}
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return ret
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}
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// UnregisterSender removes a Sender with a particular name from the list.
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func UnregisterSender(name string) {
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sendersM.Lock()
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defer sendersM.Unlock()
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delete(senders, name)
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}
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