/* Copyright (c) 2015, Hendrik van Wyk All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name of invertergui nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package munin import ( "bytes" "fmt" "net/http" "time" "invertergui/mk2driver" "github.com/sirupsen/logrus" ) var log = logrus.WithField("ctx", "inverter-gui-munin") type Munin struct { mk2driver.Mk2 muninResponse chan muninData } type muninData struct { status mk2driver.Mk2Info timesUpdated int } func NewMunin(mk2 mk2driver.Mk2) *Munin { m := &Munin{ Mk2: mk2, muninResponse: make(chan muninData), } go m.run() return m } func (m *Munin) ServeMuninHTTP(rw http.ResponseWriter, _ *http.Request) { muninDat := <-m.muninResponse if muninDat.timesUpdated == 0 { log.Error("No data returned") rw.WriteHeader(500) _, _ = rw.Write([]byte("No data to return.\n")) return } calcMuninAverages(&muninDat) status := muninDat.status tmpInput := buildTemplateInput(&status) outputBuf := &bytes.Buffer{} fmt.Fprintf(outputBuf, "multigraph in_batvolt\n") fmt.Fprintf(outputBuf, "volt.value %s\n", tmpInput.BatVoltage) fmt.Fprintf(outputBuf, "multigraph in_batcharge\n") fmt.Fprintf(outputBuf, "charge.value %s\n", tmpInput.BatCharge) fmt.Fprintf(outputBuf, "multigraph in_batcurrent\n") fmt.Fprintf(outputBuf, "current.value %s\n", tmpInput.BatCurrent) fmt.Fprintf(outputBuf, "multigraph in_batpower\n") fmt.Fprintf(outputBuf, "power.value %s\n", tmpInput.BatPower) fmt.Fprintf(outputBuf, "multigraph in_mainscurrent\n") fmt.Fprintf(outputBuf, "currentin.value %s\n", tmpInput.InCurrent) fmt.Fprintf(outputBuf, "currentout.value %s\n", tmpInput.OutCurrent) fmt.Fprintf(outputBuf, "multigraph in_mainsvoltage\n") fmt.Fprintf(outputBuf, "voltagein.value %s\n", tmpInput.InVoltage) fmt.Fprintf(outputBuf, "voltageout.value %s\n", tmpInput.OutVoltage) fmt.Fprintf(outputBuf, "multigraph in_mainspower\n") fmt.Fprintf(outputBuf, "powerin.value %s\n", tmpInput.InPower) fmt.Fprintf(outputBuf, "powerout.value %s\n", tmpInput.OutPower) fmt.Fprintf(outputBuf, "multigraph in_mainsfreq\n") fmt.Fprintf(outputBuf, "freqin.value %s\n", tmpInput.InFreq) fmt.Fprintf(outputBuf, "freqout.value %s\n", tmpInput.OutFreq) _, err := rw.Write(outputBuf.Bytes()) if err != nil { log.Errorf("Could not write data response: %v", err) } } func (m *Munin) ServeMuninConfigHTTP(rw http.ResponseWriter, _ *http.Request) { output := muninConfig _, err := rw.Write([]byte(output)) if err != nil { log.Errorf("Could not write config response: %v", err) } } func (m *Munin) run() { muninValues := &muninData{ status: mk2driver.Mk2Info{}, } for { select { case e := <-m.C(): if e.Valid { calcMuninValues(muninValues, e) } case m.muninResponse <- *muninValues: zeroMuninValues(muninValues) } } } // Munin only samples once every 5 minutes so averages have to be calculated for some values. func calcMuninValues(m *muninData, newStatus *mk2driver.Mk2Info) { m.timesUpdated++ m.status.OutCurrent += newStatus.OutCurrent m.status.InCurrent += newStatus.InCurrent m.status.BatCurrent += newStatus.BatCurrent m.status.OutVoltage += newStatus.OutVoltage m.status.InVoltage += newStatus.InVoltage m.status.BatVoltage += newStatus.BatVoltage m.status.InFrequency = newStatus.InFrequency m.status.OutFrequency = newStatus.OutFrequency m.status.ChargeState = newStatus.ChargeState } func calcMuninAverages(m *muninData) { m.status.OutCurrent /= float64(m.timesUpdated) m.status.InCurrent /= float64(m.timesUpdated) m.status.BatCurrent /= float64(m.timesUpdated) m.status.OutVoltage /= float64(m.timesUpdated) m.status.InVoltage /= float64(m.timesUpdated) m.status.BatVoltage /= float64(m.timesUpdated) } func zeroMuninValues(m *muninData) { m.timesUpdated = 0 m.status.OutCurrent = 0 m.status.InCurrent = 0 m.status.BatCurrent = 0 m.status.OutVoltage = 0 m.status.InVoltage = 0 m.status.BatVoltage = 0 m.status.InFrequency = 0 m.status.OutFrequency = 0 m.status.ChargeState = 0 } type templateInput struct { Date string `json:"date"` OutCurrent string `json:"output_current"` OutVoltage string `json:"output_voltage"` OutPower string `json:"output_power"` InCurrent string `json:"input_current"` InVoltage string `json:"input_voltage"` InPower string `json:"input_power"` InMinOut string BatVoltage string `json:"battery_voltage"` BatCurrent string `json:"battery_current"` BatPower string `json:"battery_power"` BatCharge string `json:"battery_charge"` InFreq string `json:"input_frequency"` OutFreq string `json:"output_frequency"` } func buildTemplateInput(status *mk2driver.Mk2Info) *templateInput { outPower := status.OutVoltage * status.OutCurrent inPower := status.InCurrent * status.InVoltage newInput := &templateInput{ Date: status.Timestamp.Format(time.RFC1123Z), OutCurrent: fmt.Sprintf("%.2f", status.OutCurrent), OutVoltage: fmt.Sprintf("%.2f", status.OutVoltage), OutPower: fmt.Sprintf("%.2f", outPower), InCurrent: fmt.Sprintf("%.2f", status.InCurrent), InVoltage: fmt.Sprintf("%.2f", status.InVoltage), InFreq: fmt.Sprintf("%.2f", status.InFrequency), OutFreq: fmt.Sprintf("%.2f", status.OutFrequency), InPower: fmt.Sprintf("%.2f", inPower), InMinOut: fmt.Sprintf("%.2f", inPower-outPower), BatCurrent: fmt.Sprintf("%.2f", status.BatCurrent), BatVoltage: fmt.Sprintf("%.2f", status.BatVoltage), BatPower: fmt.Sprintf("%.2f", status.BatVoltage*status.BatCurrent), BatCharge: fmt.Sprintf("%.2f", status.ChargeState*100), } return newInput }