mon_conf.go

Documentation: github.com/letsencrypt/boulder/observer

     1  package observer
     2  
     3  import (
     4  	"errors"
     5  	"time"
     6  
     7  	"github.com/prometheus/client_golang/prometheus"
     8  	"gopkg.in/yaml.v3"
     9  
    10  	"github.com/letsencrypt/boulder/config"
    11  	"github.com/letsencrypt/boulder/observer/probers"
    12  )
    13  
    14  // MonConf is exported to receive YAML configuration in `ObsConf`.
    15  type MonConf struct {
    16  	Period   config.Duration  `yaml:"period"`
    17  	Kind     string           `yaml:"kind" validate:"required,oneof=DNS HTTP CRL TLS"`
    18  	Settings probers.Settings `yaml:"settings" validate:"min=1,dive"`
    19  }
    20  
    21  // validatePeriod ensures the received `Period` field is at least 1µs.
    22  func (c *MonConf) validatePeriod() error {
    23  	if c.Period.Duration < 1*time.Microsecond {
    24  		return errors.New("period must be at least 1µs")
    25  	}
    26  	return nil
    27  }
    28  
    29  // unmarshalConfigurer constructs a `Configurer` by marshaling the
    30  // value of the `Settings` field back to bytes, then passing it to the
    31  // `UnmarshalSettings` method of the `Configurer` type specified by the
    32  // `Kind` field.
    33  func (c MonConf) unmarshalConfigurer() (probers.Configurer, error) {
    34  	configurer, err := probers.GetConfigurer(c.Kind)
    35  	if err != nil {
    36  		return nil, err
    37  	}
    38  	settings, _ := yaml.Marshal(c.Settings)
    39  	configurer, err = configurer.UnmarshalSettings(settings)
    40  	if err != nil {
    41  		return nil, err
    42  	}
    43  	return configurer, nil
    44  }
    45  
    46  // makeMonitor constructs a `monitor` object from the contents of the
    47  // bound `MonConf`. If the `MonConf` cannot be validated, an error
    48  // appropriate for end-user consumption is returned instead.
    49  func (c MonConf) makeMonitor(collectors map[string]prometheus.Collector) (*monitor, error) {
    50  	err := c.validatePeriod()
    51  	if err != nil {
    52  		return nil, err
    53  	}
    54  	probeConf, err := c.unmarshalConfigurer()
    55  	if err != nil {
    56  		return nil, err
    57  	}
    58  	prober, err := probeConf.MakeProber(collectors)
    59  	if err != nil {
    60  		return nil, err
    61  	}
    62  	return &monitor{c.Period.Duration, prober}, nil
    63  }
    64
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