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chain_pipe.go
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chain_pipe.go
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package metrics
import (
"fmt"
"sync"
"github.com/prometheus/client_golang/prometheus"
"github.com/iotaledger/wasp/packages/isc"
)
type ChainPipeMetricsProvider struct {
// We use Func variant of a metric here, thus we register them
// explicitly when they are created. Therefore we need a registry here.
reg prometheus.Registerer
}
func newChainPipeMetricsProvider() *ChainPipeMetricsProvider {
return &ChainPipeMetricsProvider{}
}
func (p *ChainPipeMetricsProvider) register(reg prometheus.Registerer) {
p.reg = reg
}
func (p *ChainPipeMetricsProvider) createForChain(chainID isc.ChainID) *ChainPipeMetrics {
return &ChainPipeMetrics{
chainID: chainID,
reg: p.reg,
lenMetrics: map[string]prometheus.Collector{},
maxMetrics: map[string]*chainPipeMaxCollector{},
}
}
type ChainPipeMetrics struct {
reg prometheus.Registerer
chainID isc.ChainID
lenMetrics map[string]prometheus.Collector
maxMetrics map[string]*chainPipeMaxCollector
regLock sync.RWMutex
}
type chainPipeMaxCollector struct {
collector prometheus.Collector
valueFuncs map[string]func() int
}
func (m *ChainPipeMetrics) cleanup() {
m.regLock.Lock()
defer m.regLock.Unlock()
if m.reg == nil {
return
}
for _, collector := range m.lenMetrics {
m.reg.Unregister(collector)
}
m.lenMetrics = map[string]prometheus.Collector{}
for _, maxCollector := range m.maxMetrics {
m.reg.Unregister(maxCollector.collector)
}
m.maxMetrics = map[string]*chainPipeMaxCollector{}
}
func (m *ChainPipeMetrics) makeLabels(pipeName string) prometheus.Labels {
return prometheus.Labels{
labelNameChain: m.chainID.String(),
labelNamePipeName: pipeName,
}
}
func (m *ChainPipeMetrics) TrackPipeLen(name string, lenFunc func() int) {
m.regLock.Lock()
defer m.regLock.Unlock()
if m.reg == nil {
return
}
if oldCollector, ok := m.lenMetrics[name]; ok {
m.reg.Unregister(oldCollector)
}
collector := prometheus.NewGaugeFunc(prometheus.GaugeOpts{
Namespace: "iota_wasp",
Subsystem: "chain_pipe",
Name: "len",
Help: "Length of a pipe",
ConstLabels: m.makeLabels(name),
}, func() float64 { return float64(lenFunc()) })
m.lenMetrics[name] = collector
if err := m.reg.Register(collector); err != nil {
panic(fmt.Errorf("failed to register pipe %v len metric for chain %v: %w", name, m.chainID, err))
}
}
func (m *ChainPipeMetrics) TrackPipeLenMax(name string, key string, lenFunc func() int) {
m.regLock.Lock()
defer m.regLock.Unlock()
if m.reg == nil {
return
}
maxCollector, found := m.maxMetrics[name]
if !found {
valueFuncs := map[string]func() int{}
collector := prometheus.NewGaugeFunc(prometheus.GaugeOpts{
Namespace: "iota_wasp",
Subsystem: "chain_pipe",
Name: "len",
Help: "Length of a pipe",
ConstLabels: m.makeLabels(name),
}, func() float64 {
max := 0
for _, f := range valueFuncs {
fVal := f()
if max < fVal {
max = fVal
}
}
return float64(max)
})
if err := m.reg.Register(collector); err != nil {
panic(fmt.Errorf("failed to register pipe %v max len metric for chain %v: %w", name, m.chainID, err))
}
maxCollector = &chainPipeMaxCollector{
collector: collector,
valueFuncs: valueFuncs,
}
m.maxMetrics[name] = maxCollector
}
maxCollector.valueFuncs[key] = lenFunc
}
func (m *ChainPipeMetrics) ForgetPipeLenMax(name string, key string) {
m.regLock.Lock()
defer m.regLock.Unlock()
if m.reg == nil {
return
}
maxCollector, found := m.maxMetrics[name]
if !found {
return
}
delete(maxCollector.valueFuncs, key)
}