68 lines
1.2 KiB
Go
68 lines
1.2 KiB
Go
package handler
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import (
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"bytes"
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"context"
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"github.com/unistack-org/micro/v3/codec"
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"github.com/unistack-org/micro/v3/errors"
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"github.com/unistack-org/micro/v3/meter"
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)
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// guard to fail early
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var _ MeterServer = &Handler{}
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type Handler struct {
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opts Options
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}
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type Option func(*Options)
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type Options struct {
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Meter meter.Meter
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Name string
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MeterOptions []meter.Option
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}
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func Meter(m meter.Meter) Option {
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return func(o *Options) {
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o.Meter = m
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}
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}
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func Name(name string) Option {
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return func(o *Options) {
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o.Name = name
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}
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}
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func MeterOptions(opts ...meter.Option) Option {
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return func(o *Options) {
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o.MeterOptions = append(o.MeterOptions, opts...)
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}
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}
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func NewOptions(opts ...Option) Options {
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options := Options{Meter: meter.DefaultMeter}
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for _, o := range opts {
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o(&options)
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}
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return options
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}
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func NewHandler(opts ...Option) *Handler {
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options := NewOptions(opts...)
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return &Handler{opts: options}
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}
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func (h *Handler) Metrics(ctx context.Context, req *codec.Frame, rsp *codec.Frame) error {
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buf := bytes.NewBuffer(nil)
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if err := h.opts.Meter.Write(buf, h.opts.MeterOptions...); err != nil {
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return errors.InternalServerError(h.opts.Name, "%v", err)
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}
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rsp.Data = buf.Bytes()
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return nil
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}
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