Golang Message.FindAVPsWithPath方法代碼示例

// messageAddAVPsWithPath will dynamically add AVPs into the message
// 	append:	append to the message, on false overwrite if AVP is single or add to group if AVP is Grouped
func messageSetAVPsWithPath(m *diam.Message, path []interface{}, avpValStr string, appnd bool, timezone string) error {
	if len(path) == 0 {
		return errors.New("Empty path as AVP filter")
	}
	dictAVPs := make([]*dict.AVP, len(path)) // for each subpath, one dictionary AVP
	for i, subpath := range path {
		if dictAVP, err := m.Dictionary().FindAVP(m.Header.ApplicationID, subpath); err != nil {
			return err
		} else if dictAVP == nil {
			return fmt.Errorf("Cannot find AVP with id: %s", path[len(path)-1])
		} else {
			dictAVPs[i] = dictAVP
		}
	}
	if dictAVPs[len(path)-1].Data.Type == diam.GroupedAVPType {
		return errors.New("Last AVP in path needs not to be GroupedAVP")
	}
	var msgAVP *diam.AVP // Keep a reference here towards last AVP
	lastAVPIdx := len(path) - 1
	for i := lastAVPIdx; i >= 0; i-- {
		var typeVal datatype.Type
		if i == lastAVPIdx {
			avpValByte, err := serializeAVPValueFromString(dictAVPs[i], avpValStr, timezone)
			if err != nil {
				return err
			}
			typeVal, err = datatype.Decode(dictAVPs[i].Data.Type, avpValByte)
			if err != nil {
				return err
			}
		} else {
			typeVal = &diam.GroupedAVP{
				AVP: []*diam.AVP{msgAVP}}
		}
		newMsgAVP := diam.NewAVP(dictAVPs[i].Code, avp.Mbit, dictAVPs[i].VendorID, typeVal) // FixMe: maybe Mbit with dictionary one
		if i == lastAVPIdx-1 && !appnd {                                                    // last AVP needs to be appended in group
			avps, _ := m.FindAVPsWithPath(path[:lastAVPIdx], dict.UndefinedVendorID)
			if len(avps) != 0 { // Group AVP already in the message
				prevGrpData := avps[0].Data.(*diam.GroupedAVP)
				prevGrpData.AVP = append(prevGrpData.AVP, msgAVP)
				m.Header.MessageLength += uint32(msgAVP.Len())
				return nil
			}
		}
		msgAVP = newMsgAVP
	}
	if !appnd { // Not group AVP, replace the previous set one with this one
		avps, _ := m.FindAVPsWithPath(path, dict.UndefinedVendorID)
		if len(avps) != 0 { // Group AVP already in the message
			m.Header.MessageLength -= uint32(avps[0].Len()) // decrease message length since we overwrite
			*avps[0] = *msgAVP
			m.Header.MessageLength += uint32(msgAVP.Len())
			return nil
		}
	}
	m.AVP = append(m.AVP, msgAVP)
	m.Header.MessageLength += uint32(msgAVP.Len())
	return nil
}

// Handler for meta functions
func metaHandler(m *diam.Message, tag, arg string, dur time.Duration) (string, error) {
	switch tag {
	case META_CCR_USAGE:
		var ok bool
		var reqType datatype.Enumerated
		var reqNr, reqUnit, usedUnit datatype.Unsigned32
		if ccReqTypeAvp, err := m.FindAVP("CC-Request-Type", 0); err != nil {
			return "", err
		} else if ccReqTypeAvp == nil {
			return "", errors.New("CC-Request-Type not found")
		} else if reqType, ok = ccReqTypeAvp.Data.(datatype.Enumerated); !ok {
			return "", fmt.Errorf("CC-Request-Type must be Enumerated and not %v", ccReqTypeAvp.Data.Type())
		}
		if ccReqNrAvp, err := m.FindAVP("CC-Request-Number", 0); err != nil {
			return "", err
		} else if ccReqNrAvp == nil {
			return "", errors.New("CC-Request-Number not found")
		} else if reqNr, ok = ccReqNrAvp.Data.(datatype.Unsigned32); !ok {
			return "", fmt.Errorf("CC-Request-Number must be Unsigned32 and not %v", ccReqNrAvp.Data.Type())
		}
		switch reqType {
		case datatype.Enumerated(1), datatype.Enumerated(2):
			if reqUnitAVPs, err := m.FindAVPsWithPath([]interface{}{"Requested-Service-Unit", "CC-Time"}, dict.UndefinedVendorID); err != nil {
				return "", err
			} else if len(reqUnitAVPs) == 0 {
				return "", errors.New("Requested-Service-Unit>CC-Time not found")
			} else if reqUnit, ok = reqUnitAVPs[0].Data.(datatype.Unsigned32); !ok {
				return "", fmt.Errorf("Requested-Service-Unit>CC-Time must be Unsigned32 and not %v", reqUnitAVPs[0].Data.Type())
			}
		case datatype.Enumerated(3), datatype.Enumerated(4):
			if usedUnitAVPs, err := m.FindAVPsWithPath([]interface{}{"Used-Service-Unit", "CC-Time"}, dict.UndefinedVendorID); err != nil {
				return "", err
			} else if len(usedUnitAVPs) != 0 {
				if usedUnit, ok = usedUnitAVPs[0].Data.(datatype.Unsigned32); !ok {
					return "", fmt.Errorf("Used-Service-Unit>CC-Time must be Unsigned32 and not %v", usedUnitAVPs[0].Data.Type())
				}
			}
		}
		usage := usageFromCCR(int(reqType), int(reqNr), int(reqUnit), int(usedUnit), dur)
		return strconv.FormatFloat(usage.Seconds(), 'f', -1, 64), nil
	}
	return "", nil
}

// avpsWithPath is used to find AVPs by specifying RSRField as filter
func avpsWithPath(m *diam.Message, rsrFld *utils.RSRField) ([]*diam.AVP, error) {
	return m.FindAVPsWithPath(splitIntoInterface(rsrFld.Id, utils.HIERARCHY_SEP), dict.UndefinedVendorID)
}