micro-server-http/handler/health/health.go

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package health // import "go.unistack.org/micro-server-http/v4/handler/health"
import (
"context"
codecpb "go.unistack.org/micro-proto/v4/codec"
"go.unistack.org/micro/v4/errors"
)
var _ HealthServiceServer = (*Handler)(nil)
type Handler struct {
opts Options
}
type CheckFunc func(context.Context) error
type Option func(*Options)
type Options struct {
Version string
Name string
LiveChecks []CheckFunc
ReadyChecks []CheckFunc
}
func LiveChecks(fns ...CheckFunc) Option {
return func(o *Options) {
o.LiveChecks = append(o.LiveChecks, fns...)
}
}
func ReadyChecks(fns ...CheckFunc) Option {
return func(o *Options) {
o.ReadyChecks = append(o.ReadyChecks, fns...)
}
}
func Name(name string) Option {
return func(o *Options) {
o.Name = name
}
}
func Version(version string) Option {
return func(o *Options) {
o.Version = version
}
}
func NewHandler(opts ...Option) *Handler {
options := Options{}
for _, o := range opts {
o(&options)
}
return &Handler{opts: options}
}
func (h *Handler) Live(ctx context.Context, req *codecpb.Frame, rsp *codecpb.Frame) error {
var err error
for _, fn := range h.opts.LiveChecks {
if err = fn(ctx); err != nil {
return errors.ServiceUnavailable(h.opts.Name, "%v", err)
}
}
return nil
}
func (h *Handler) Ready(ctx context.Context, req *codecpb.Frame, rsp *codecpb.Frame) error {
var err error
for _, fn := range h.opts.ReadyChecks {
if err = fn(ctx); err != nil {
return errors.ServiceUnavailable(h.opts.Name, "%v", err)
}
}
return nil
}
func (h *Handler) Version(ctx context.Context, req *codecpb.Frame, rsp *codecpb.Frame) error {
rsp.Data = []byte(h.opts.Version)
return nil
}