Add Uniter API upward compatibility for NetworkInfo endpoint.

apiserver/facades/agent/uniter/uniter.go

@@ -2189,3 +2189,20 @@ func (u *UniterAPIV4) NetworkInfo(_, _ struct{}) {}
 
 // WatchUnitRelations isn't on the V4 API.
 func (u *UniterAPIV4) WatchUnitRelations(_, _ struct{}) {}
+
+func networkInfoResultsToV6(v7Results params.NetworkInfoResults) params.NetworkInfoResultsV6 {
+	results := make(map[string]params.NetworkInfoResultV6)
+	for k, v6Result := range v7Results.Results {
+		results[k] = params.NetworkInfoResultV6{Error: v6Result.Error, Info: v6Result.Info}
+	}
+	return params.NetworkInfoResultsV6{Results: results}
+}
+
+// Network Info implements UniterAPIV6 version of NetworkInfo by constructing an API V6 compatible result.
+func (u *UniterAPIV6) NetworkInfo(args params.NetworkInfoParams) (params.NetworkInfoResultsV6, error) {
+	v6Results, err := u.UniterAPI.NetworkInfo(args)
+	if err != nil {
+		return params.NetworkInfoResultsV6{}, errors.Trace(err)
+	}
+	return networkInfoResultsToV6(v6Results), nil
+}

apiserver/params/network.go

@@ -689,7 +689,7 @@ type NetworkInfo struct {
 	Addresses []InterfaceAddress `json:"addresses"`
 }
 
-// NetworkInfoResult holds either and error or a list of NetworkInfos for given binding.
+// NetworkInfoResult Adds egress and ingress subnets and changes the `Info` key name in yaml/json serialization to V6.
 type NetworkInfoResult struct {
 	Error            *Error        `json:"error,omitempty" yaml:"error,omitempty"`
 	Info             []NetworkInfo `json:"bind-addresses,omitempty" yaml:"bind-addresses,omitempty"`
@@ -702,6 +702,17 @@ type NetworkInfoResults struct {
 	Results map[string]NetworkInfoResult `json:"results"`
 }
 
+// NetworkInfoResultV6 holds either and error or a list of NetworkInfos for given binding.
+type NetworkInfoResultV6 struct {
+	Error *Error        `json:"error,omitempty" yaml:"error,omitempty"`
+	Info  []NetworkInfo `json:"network-info" yaml:"info"`
+}
+
+// NetworkInfoResults holds a mapping from binding name to NetworkInfoResultV6.
+type NetworkInfoResultsV6 struct {
+	Results map[string]NetworkInfoResultV6 `json:"results"`
+}
+
 // NetworkInfoParams holds a name of the unit and list of bindings for which we want to get NetworkInfos.
 type NetworkInfoParams struct {
 	Unit       string   `json:"unit"`