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// Copyright 2015 Prometheus Team
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package provider
import (
var (
// ErrNotFound is returned if a provider cannot find a requested item.
ErrNotFound = fmt.Errorf("item not found")
// Iterator provides the functions common to all iterators. To be useful, a
// specific iterator interface (e.g. AlertIterator) has to be implemented that
// provides a Next method.
type Iterator interface {
// Err returns the current error. It is not safe to call it concurrently
// with other iterator methods or while reading from a channel returned
// by the iterator.
Err() error
// Close must be called to release resources once the iterator is not
// used anymore.
// AlertIterator is an Iterator for Alerts.
type AlertIterator interface {
// Next returns a channel that will be closed once the iterator is
// exhausted. It is not necessary to exhaust the iterator but Close must
// be called in any case to release resources used by the iterator (even
// if the iterator is exhausted).
Next() <-chan *types.Alert
// NewAlertIterator returns a new AlertIterator based on the generic alertIterator type
func NewAlertIterator(ch <-chan *types.Alert, done chan struct{}, err error) AlertIterator {
return &alertIterator{
ch: ch,
done: done,
err: err,
// alertIterator implements AlertIterator. So far, this one fits all providers.
type alertIterator struct {
ch <-chan *types.Alert
done chan struct{}
err error
func (ai alertIterator) Next() <-chan *types.Alert {
func (ai alertIterator) Err() error { return ai.err }
func (ai alertIterator) Close() { close(ai.done) }
// Alerts gives access to a set of alerts. All methods are goroutine-safe.
type Alerts interface {
// Subscribe returns an iterator over active alerts that have not been
// resolved and successfully notified about.
// They are not guaranteed to be in chronological order.
Subscribe() AlertIterator
// GetPending returns an iterator over all alerts that have
// pending notifications.
GetPending() AlertIterator
GetAll() AlertIterator
// Get returns the alert for a given fingerprint.
Get(model.Fingerprint) (*types.Alert, error)
// Put adds the given alert to the set.
Put(...*types.Alert) error
// Silences gives access to silences. All methods are goroutine-safe.
type Silences interface {
// The Silences provider must implement the Muter interface
// for all its silences. The data provider may have access to an
// optimized view of the data to perform this evaluation.
// All returns all existing silences.
All() ([]*types.Silence, error)
// Set a new silence.
Set(*types.Silence) (uint64, error)
// Del removes a silence.
Del(uint64) error
// Get a silence associated with a fingerprint.
Get(uint64) (*types.Silence, error)
// Notifies provides information about pending and successful
// notifications. All methods are goroutine-safe.
type Notifies interface {
Get(dest string, fps ...model.Fingerprint) ([]*types.NotifyInfo, error)
// Set several notifies at once. All or none must succeed.
Set(ns ...*types.NotifyInfo) error