josh/ina219-exporter
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use log.Fatalf

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This commit is contained in:
Josh Deprez 2024-11-06 09:26:14 +11:00
parent cb8e380601
commit 1028991b87
1 changed files with 12 additions and 22 deletions
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34
exporter.go
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@ -29,10 +29,7 @@ import (
"periph.io/x/host/v3" "periph.io/x/host/v3"
) )
func mainImpl() error { func main() {
if _, err := host.Init(); err != nil {
return err
}
httpAddr := flag.String("http-address", ":9455", "Listen addr for HTTP handler") httpAddr := flag.String("http-address", ":9455", "Listen addr for HTTP handler")
i2cAddress := flag.Int("i2c-address", 0x45, "I²C address") i2cAddress := flag.Int("i2c-address", 0x45, "I²C address")
i2cBus := flag.String("i2c-bus", "", "I²C bus (/dev/i2c-1)") i2cBus := flag.String("i2c-bus", "", "I²C bus (/dev/i2c-1)")
@ -43,27 +40,27 @@ func mainImpl() error {
resistor, err := parseNanoSI[physic.ElectricResistance](*senseResistor) resistor, err := parseNanoSI[physic.ElectricResistance](*senseResistor)
if err != nil { if err != nil {
return fmt.Errorf("parsing --sense-resistor: %w", err) log.Fatalf("parsing --sense-resistor: %w", err)
} }
if resistor <= 0 { if resistor <= 0 {
return fmt.Errorf("--sense-resistor must be positive") log.Fatalf("--sense-resistor must be positive")
} }
current, err := parseNanoSI[physic.ElectricCurrent](*maxCurrent) current, err := parseNanoSI[physic.ElectricCurrent](*maxCurrent)
if err != nil { if err != nil {
return fmt.Errorf("parsing --max-current: %w", err) log.Fatalf("parsing --max-current: %w", err)
} }
if current <= 0 { if current <= 0 {
return fmt.Errorf("--max-current must be positive") log.Fatalf("--max-current must be positive")
} }
if _, err := host.Init(); err != nil { if _, err := host.Init(); err != nil {
return err log.Fatalf("host.Init() error: %v", err)
} }
// Open default I²C bus. // Open default I²C bus.
bus, err := i2creg.Open(*i2cBus) bus, err := i2creg.Open(*i2cBus)
if err != nil { if err != nil {
return fmt.Errorf("failed to open I²C: %v", err) log.Fatalf("i2creg.Open(%v): %v", *i2cBus, err)
} }
defer bus.Close() defer bus.Close()
@ -73,7 +70,7 @@ func mainImpl() error {
MaxCurrent: current, MaxCurrent: current,
}) })
if err != nil { if err != nil {
return fmt.Errorf("failed to open new sensor: %v", err) log.Fatalf("ina219.New(...): %v", err)
} }
constLabels := prometheus.Labels{"i2c_addr": fmt.Sprintf("0x%x", *i2cAddress)} constLabels := prometheus.Labels{"i2c_addr": fmt.Sprintf("0x%x", *i2cAddress)}
@ -162,18 +159,18 @@ func mainImpl() error {
case <-everySecond: case <-everySecond:
p, err := sensor.Sense() p, err := sensor.Sense()
if err != nil { if err != nil {
return fmt.Errorf("sensor reading error: %v", err) log.Fatalf("sensor.Sense() error: %v", err)
} }
// sanity check sensor outputs: // sanity check sensor outputs:
// current = shunt / resistor, but resistor is fixed, // current = shunt / resistor, but resistor is fixed,
// so if current == 0 if and only if shunt == 0 // so if current == 0 if and only if shunt == 0
if (p.Current == 0) != (p.Shunt == 0) { if (p.Current == 0) != (p.Shunt == 0) {
return fmt.Errorf("current = %v but shunt = %v", p.Current, p.Shunt) log.Fatalf("Ohm's Law violation: current = %v but shunt = %v", p.Current, p.Shunt)
} }
// power = current * voltage, similar logic // power = current * voltage, similar logic
if (p.Power == 0) != (p.Current == 0 || p.Voltage == 0) { if (p.Power == 0) != (p.Current == 0 || p.Voltage == 0) {
return fmt.Errorf("power = %v but current = %v and voltage = %v", p.Power, p.Current, p.Voltage) log.Fatalf("Joule's First Law violation: power = %v but current = %v and voltage = %v", p.Power, p.Current, p.Voltage)
} }
busVolts := float64(p.Voltage) / float64(physic.Volt) busVolts := float64(p.Voltage) / float64(physic.Volt)
@ -193,18 +190,11 @@ func mainImpl() error {
shuntVoltageSumm.Observe(shuntVolts) shuntVoltageSumm.Observe(shuntVolts)
case <-halt: case <-halt:
return nil return
} }
} }
} }
func main() {
if err := mainImpl(); err != nil {
fmt.Fprintf(os.Stderr, "ina219: %s.\n", err)
return
}
}
var siSmallRE = regexp.MustCompile(`^(\d+)(m|mu|µ|n)?$`) var siSmallRE = regexp.MustCompile(`^(\d+)(m|mu|µ|n)?$`)
func parseNanoSI[U ~int64](s string) (U, error) { func parseNanoSI[U ~int64](s string) (U, error) {