micro/meter/options.go

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package metrics
import (
"context"
"github.com/unistack-org/micro/v3/logger"
"github.com/unistack-org/micro/v3/metadata"
)
var (
// The Prometheus metrics will be made available on this port:
defaultPrometheusListenAddress = ":9000"
// This is the endpoint where the Prometheus metrics will be made available ("/metrics" is the default with Prometheus):
defaultPath = "/metrics"
// timingObjectives is the default spread of stats we maintain for timings / histograms:
defaultTimingObjectives = map[float64]float64{0.0: 0, 0.5: 0.05, 0.75: 0.04, 0.90: 0.03, 0.95: 0.02, 0.98: 0.001, 1: 0}
)
// Option powers the configuration for metrics implementations:
type Option func(*Options)
// Options for metrics implementations:
type Options struct {
Address string
Path string
DefaultTags metadata.Metadata
TimingObjectives map[float64]float64
Logger logger.Logger
Context context.Context
}
// NewOptions prepares a set of options:
func NewOptions(opt ...Option) Options {
opts := Options{
Address: defaultPrometheusListenAddress,
DefaultTags: metadata.New(2),
Path: defaultPath,
TimingObjectives: defaultTimingObjectives,
Context: context.Background(),
}
for _, o := range opt {
o(&opts)
}
return opts
}
// Cntext sets the metrics context
func Context(ctx context.Context) Option {
return func(o *Options) {
o.Context = ctx
}
}
// Path used to serve metrics over HTTP:
func Path(value string) Option {
return func(o *Options) {
o.Path = value
}
}
// Address is the listen address to serve metrics on:
func Address(value string) Option {
return func(o *Options) {
o.Address = value
}
}
// DefaultTags will be added to every metric:
func DefaultTags(md metadata.Metadata) Option {
return func(o *Options) {
o.DefaultTags = metadata.Copy(md)
}
}
// TimingObjectives defines the desired spread of statistics for histogram / timing metrics:
func TimingObjectives(value map[float64]float64) Option {
return func(o *Options) {
o.TimingObjectives = value
}
}
// Logger sets the logger
func Logger(l logger.Logger) Option {
return func(o *Options) {
o.Logger = l
}
}