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// JSON marshaling and unmarshaling support for Openstack compute data structures.
// This package deals with the difference between the API and on-the-wire data types.
// Differences include encoding entity IDs as string vs int, depending on the Openstack
// variant used.
//
// The marshaling support is included primarily for use by the test doubles. It needs to be
// included here since Go requires methods to implemented in the same package as their receiver.
package nova
import (
"encoding/json"
"fmt"
"strconv"
)
const (
idTag = "id"
instanceIdTag = "instance_id"
groupIdTag = "group_id"
parentGroupIdTag = "parent_group_id"
)
var useNumericIds bool = false
// convertId returns the id as either a string or an int depending on what
// implementation of Openstack we are emulating.
func convertId(id string) interface{} {
if !useNumericIds {
return id
}
result, err := strconv.Atoi(id)
if err != nil {
panic(err)
}
return result
}
// getIdAsStringPtr extracts the field with the specified tag from the json data
// and returns it converted to a string pointer.
func getIdAsStringPtr(b []byte, tag string) (*string, error) {
var out map[string]interface{}
if err := json.Unmarshal(b, &out); err != nil {
return nil, err
}
val, ok := out[tag]
if !ok || val == nil {
return nil, nil
}
floatVal, ok := val.(float64)
var strVal string
if ok {
strVal = fmt.Sprint(int(floatVal))
} else {
strVal = fmt.Sprint(val)
}
return &strVal, nil
}
// getIdAsString extracts the field with the specified tag from the json data
// and returns it converted to a string.
func getIdAsString(b []byte, tag string) (string, error) {
strPtr, err := getIdAsStringPtr(b, tag)
if err != nil {
return "", err
}
if strPtr == nil {
return "", nil
}
return *strPtr, nil
}
// appendJSON marshals the given attribute value and appends it as an encoded value to the given json data.
// The newly encode (attr, value) is inserted just before the closing "}" in the json data.
func appendJSON(data []byte, attr string, value interface{}) ([]byte, error) {
newData, err := json.Marshal(&value)
if err != nil {
return nil, err
}
strData := string(data)
result := fmt.Sprintf(`%s, "%s":%s}`, strData[:len(strData)-1], attr, string(newData))
return []byte(result), nil
}
type jsonEntity Entity
func (entity *Entity) UnmarshalJSON(b []byte) error {
var je jsonEntity = jsonEntity(*entity)
var err error
if err = json.Unmarshal(b, &je); err != nil {
// Related Bug lp:1683495, within the openstack compute api
// response to List Servers Detailed, the image object might
// be an empty string when you boot the server from a volume.
// Before failing here, let's check to see if that's the case.
if string(b) == "\"\"" {
*entity = Entity(je)
return nil
} else {
return err
}
}
if je.Id, err = getIdAsString(b, idTag); err != nil {
return err
}
*entity = Entity(je)
return nil
}
func (entity Entity) MarshalJSON() ([]byte, error) {
var je jsonEntity = jsonEntity(entity)
data, err := json.Marshal(&je)
if err != nil {
return nil, err
}
id := convertId(entity.Id)
return appendJSON(data, idTag, id)
}
type jsonFlavorDetail FlavorDetail
func (flavorDetail *FlavorDetail) UnmarshalJSON(b []byte) error {
var jfd jsonFlavorDetail = jsonFlavorDetail(*flavorDetail)
var err error
if err = json.Unmarshal(b, &jfd); err != nil {
return err
}
if jfd.Id, err = getIdAsString(b, idTag); err != nil {
return err
}
*flavorDetail = FlavorDetail(jfd)
return nil
}
func (flavorDetail FlavorDetail) MarshalJSON() ([]byte, error) {
var jfd jsonFlavorDetail = jsonFlavorDetail(flavorDetail)
data, err := json.Marshal(&jfd)
if err != nil {
return nil, err
}
id := convertId(flavorDetail.Id)
return appendJSON(data, idTag, id)
}
type jsonServerDetail ServerDetail
func (serverDetail *ServerDetail) UnmarshalJSON(b []byte) error {
var jsd jsonServerDetail = jsonServerDetail(*serverDetail)
var err error
if err = json.Unmarshal(b, &jsd); err != nil {
return err
}
if jsd.Id, err = getIdAsString(b, idTag); err != nil {
return err
}
*serverDetail = ServerDetail(jsd)
return nil
}
func (serverDetail ServerDetail) MarshalJSON() ([]byte, error) {
var jsd jsonServerDetail = jsonServerDetail(serverDetail)
data, err := json.Marshal(&jsd)
if err != nil {
return nil, err
}
id := convertId(serverDetail.Id)
return appendJSON(data, idTag, id)
}
type jsonFloatingIP FloatingIP
func (floatingIP *FloatingIP) UnmarshalJSON(b []byte) error {
var jfip jsonFloatingIP = jsonFloatingIP(*floatingIP)
var err error
if err = json.Unmarshal(b, &jfip); err != nil {
return err
}
if instIdPtr, err := getIdAsStringPtr(b, instanceIdTag); err != nil {
return err
} else {
jfip.InstanceId = instIdPtr
}
if jfip.Id, err = getIdAsString(b, idTag); err != nil {
return err
}
*floatingIP = FloatingIP(jfip)
return nil
}
func (floatingIP FloatingIP) MarshalJSON() ([]byte, error) {
var jfip jsonFloatingIP = jsonFloatingIP(floatingIP)
data, err := json.Marshal(&jfip)
if err != nil {
return nil, err
}
id := convertId(floatingIP.Id)
data, err = appendJSON(data, idTag, id)
if err != nil {
return nil, err
}
if floatingIP.InstanceId == nil {
return data, nil
}
instId := convertId(*floatingIP.InstanceId)
return appendJSON(data, instanceIdTag, instId)
}
type jsonSecurityGroup SecurityGroup
func (securityGroup *SecurityGroup) UnmarshalJSON(b []byte) error {
var jsg jsonSecurityGroup = jsonSecurityGroup(*securityGroup)
var err error
if err = json.Unmarshal(b, &jsg); err != nil {
return err
}
if jsg.Id, err = getIdAsString(b, idTag); err != nil {
return err
}
*securityGroup = SecurityGroup(jsg)
return nil
}
func (securityGroup SecurityGroup) MarshalJSON() ([]byte, error) {
var jsg jsonSecurityGroup = jsonSecurityGroup(securityGroup)
data, err := json.Marshal(&jsg)
if err != nil {
return nil, err
}
id := convertId(securityGroup.Id)
return appendJSON(data, idTag, id)
}
type jsonSecurityGroupRule SecurityGroupRule
func (securityGroupRule *SecurityGroupRule) UnmarshalJSON(b []byte) error {
var jsgr jsonSecurityGroupRule = jsonSecurityGroupRule(*securityGroupRule)
var err error
if err = json.Unmarshal(b, &jsgr); err != nil {
return err
}
if jsgr.Id, err = getIdAsString(b, idTag); err != nil {
return err
}
if jsgr.ParentGroupId, err = getIdAsString(b, parentGroupIdTag); err != nil {
return err
}
*securityGroupRule = SecurityGroupRule(jsgr)
return nil
}
func (securityGroupRule SecurityGroupRule) MarshalJSON() ([]byte, error) {
var jsgr jsonSecurityGroupRule = jsonSecurityGroupRule(securityGroupRule)
data, err := json.Marshal(&jsgr)
if err != nil {
return nil, err
}
id := convertId(securityGroupRule.Id)
data, err = appendJSON(data, idTag, id)
if err != nil {
return nil, err
}
if securityGroupRule.ParentGroupId == "" {
return data, nil
}
id = convertId(securityGroupRule.ParentGroupId)
return appendJSON(data, parentGroupIdTag, id)
}
type jsonRuleInfo RuleInfo
func (ruleInfo *RuleInfo) UnmarshalJSON(b []byte) error {
var jri jsonRuleInfo = jsonRuleInfo(*ruleInfo)
var err error
if err = json.Unmarshal(b, &jri); err != nil {
return err
}
if jri.ParentGroupId, err = getIdAsString(b, parentGroupIdTag); err != nil {
return err
}
if groupIdPtr, err := getIdAsStringPtr(b, groupIdTag); err != nil {
return err
} else {
jri.GroupId = groupIdPtr
}
*ruleInfo = RuleInfo(jri)
return nil
}
func (ruleInfo RuleInfo) MarshalJSON() ([]byte, error) {
var jri jsonRuleInfo = jsonRuleInfo(ruleInfo)
data, err := json.Marshal(&jri)
if err != nil {
return nil, err
}
id := convertId(ruleInfo.ParentGroupId)
data, err = appendJSON(data, parentGroupIdTag, id)
if err != nil {
return nil, err
}
if ruleInfo.GroupId == nil {
return data, nil
}
id = convertId(*ruleInfo.GroupId)
return appendJSON(data, groupIdTag, id)
}
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