61 lines
1.4 KiB
Go
61 lines
1.4 KiB
Go
// Copyright 2013 Prometheus Team
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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 web
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import (
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"net/http"
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"sync"
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"time"
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"github.com/prometheus/prometheus/storage/raw"
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)
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type DatabaseStatesProvider interface {
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States() raw.DatabaseStates
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}
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type DatabasesHandler struct {
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RefreshInterval time.Duration
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NextRefresh time.Time
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Current raw.DatabaseStates
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Provider DatabaseStatesProvider
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mutex sync.RWMutex
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}
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func (h *DatabasesHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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h.Refresh()
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h.mutex.RLock()
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defer h.mutex.RUnlock()
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executeTemplate(w, "databases", h)
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}
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func (h *DatabasesHandler) Refresh() {
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h.mutex.RLock()
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if !time.Now().After(h.NextRefresh) {
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h.mutex.RUnlock()
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return
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}
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h.mutex.RUnlock()
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h.mutex.Lock()
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defer h.mutex.Unlock()
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h.Current = h.Provider.States()
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h.NextRefresh = time.Now().Add(h.RefreshInterval)
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}
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