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60 lines
1.4 KiB
60 lines
1.4 KiB
// 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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