src/go/plugin/go.d/modules/prometheus/prometheus.go
// SPDX-License-Identifier: GPL-3.0-or-later
package prometheus
import (
_ "embed"
"errors"
"time"
"github.com/netdata/netdata/go/plugins/pkg/matcher"
"github.com/netdata/netdata/go/plugins/plugin/go.d/agent/module"
"github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/confopt"
"github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/prometheus"
"github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/prometheus/selector"
"github.com/netdata/netdata/go/plugins/plugin/go.d/pkg/web"
)
//go:embed "config_schema.json"
var configSchema string
func init() {
module.Register("prometheus", module.Creator{
JobConfigSchema: configSchema,
Defaults: module.Defaults{
UpdateEvery: 10,
},
Create: func() module.Module { return New() },
Config: func() any { return &Config{} },
})
}
func New() *Prometheus {
return &Prometheus{
Config: Config{
HTTPConfig: web.HTTPConfig{
ClientConfig: web.ClientConfig{
Timeout: confopt.Duration(time.Second * 10),
},
},
MaxTS: 2000,
MaxTSPerMetric: 200,
},
charts: &module.Charts{},
cache: newCache(),
}
}
type Config struct {
UpdateEvery int `yaml:"update_every,omitempty" json:"update_every"`
web.HTTPConfig `yaml:",inline" json:""`
Name string `yaml:"name,omitempty" json:"name"`
Application string `yaml:"app,omitempty" json:"app"`
LabelPrefix string `yaml:"label_prefix,omitempty" json:"label_prefix"`
BearerTokenFile string `yaml:"bearer_token_file,omitempty" json:"bearer_token_file"`
Selector selector.Expr `yaml:"selector,omitempty" json:"selector"`
ExpectedPrefix string `yaml:"expected_prefix,omitempty" json:"expected_prefix"`
MaxTS int `yaml:"max_time_series" json:"max_time_series"`
MaxTSPerMetric int `yaml:"max_time_series_per_metric" json:"max_time_series_per_metric"`
FallbackType struct {
Gauge []string `yaml:"gauge,omitempty" json:"gauge"`
Counter []string `yaml:"counter,omitempty" json:"counter"`
} `yaml:"fallback_type,omitempty" json:"fallback_type"`
}
type Prometheus struct {
module.Base
Config `yaml:",inline" json:""`
charts *module.Charts
prom prometheus.Prometheus
cache *cache
fallbackType struct {
counter matcher.Matcher
gauge matcher.Matcher
}
}
func (p *Prometheus) Configuration() any {
return p.Config
}
func (p *Prometheus) Init() error {
if err := p.validateConfig(); err != nil {
p.Errorf("validating config: %v", err)
return err
}
prom, err := p.initPrometheusClient()
if err != nil {
p.Errorf("init prometheus client: %v", err)
return err
}
p.prom = prom
m, err := p.initFallbackTypeMatcher(p.FallbackType.Counter)
if err != nil {
p.Errorf("init counter fallback type matcher: %v", err)
return err
}
p.fallbackType.counter = m
m, err = p.initFallbackTypeMatcher(p.FallbackType.Gauge)
if err != nil {
p.Errorf("init counter fallback type matcher: %v", err)
return err
}
p.fallbackType.gauge = m
return nil
}
func (p *Prometheus) Check() error {
mx, err := p.collect()
if err != nil {
p.Error(err)
return err
}
if len(mx) == 0 {
return errors.New("no metrics collected")
}
return nil
}
func (p *Prometheus) Charts() *module.Charts {
return p.charts
}
func (p *Prometheus) Collect() map[string]int64 {
mx, err := p.collect()
if err != nil {
p.Error(err)
}
if len(mx) == 0 {
return nil
}
return mx
}
func (p *Prometheus) Cleanup() {
if p.prom != nil && p.prom.HTTPClient() != nil {
p.prom.HTTPClient().CloseIdleConnections()
}
}