prometheus/web/databases.go

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// Copyright 2013 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
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package web
import (
"net/http"
"sync"
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"time"
"github.com/prometheus/prometheus/storage/raw"
)
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type DatabaseStatesProvider interface {
States() raw.DatabaseStates
}
type DatabasesHandler struct {
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RefreshInterval time.Duration
NextRefresh time.Time
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Current raw.DatabaseStates
Provider DatabaseStatesProvider
mutex sync.RWMutex
}
func (h *DatabasesHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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h.Refresh()
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h.mutex.RLock()
defer h.mutex.RUnlock()
executeTemplate(w, "databases", h)
}
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func (h *DatabasesHandler) Refresh() {
h.mutex.RLock()
if !time.Now().After(h.NextRefresh) {
h.mutex.RUnlock()
return
}
h.mutex.RUnlock()
h.mutex.Lock()
defer h.mutex.Unlock()
h.Current = h.Provider.States()
h.NextRefresh = time.Now().Add(h.RefreshInterval)
}