Merge remote-tracking branch 'origin/rpcerr' into space-sync

common/net/rpc/rpcerr/registry.go

@@ -0,0 +1,51 @@
+package rpcerr
+
+import (
+	"errors"
+	"fmt"
+	"storj.io/drpc/drpcerr"
+)
+
+var (
+	Unexpected = RegisterErr(errors.New("unexpected"), 1)
+	Closed     = RegisterErr(errors.New("closed"), 2)
+)
+
+var (
+	errsMap = make(map[uint64]error)
+)
+
+func RegisterErr(err error, code uint64) error {
+	if e, ok := errsMap[code]; ok {
+		panic(fmt.Errorf("attempt to register error with exiswting code: %d; registered error: %v", code, e))
+	}
+	errWithCode := drpcerr.WithCode(err, code)
+	errsMap[code] = errWithCode
+	return errWithCode
+}
+
+func Err(code uint64) error {
+	err, ok := errsMap[code]
+	if !ok {
+		return drpcerr.WithCode(fmt.Errorf("unexpected error, code: %d", code), code)
+	}
+	return err
+}
+
+func Unwrap(e error) error {
+	code := drpcerr.Code(e)
+	if code == 0 {
+		return e
+	}
+	err, ok := errsMap[code]
+	if !ok {
+		return drpcerr.WithCode(fmt.Errorf("unexpected error: %v; code: %d", err, code), code)
+	}
+	return err
+}
+
+type ErrGroup int64
+
+func (g ErrGroup) Register(err error, code uint64) error {
+	return RegisterErr(err, uint64(g)+code)
+}