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vs.go
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vs.go
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package patch
import (
"bytes"
"github.com/gogo/protobuf/jsonpb"
"github.com/gogo/protobuf/proto"
"github.com/gogo/protobuf/types"
"github.com/istio-conductor/istiofilter/api/v1alpha1"
networking "istio.io/api/networking/v1alpha3"
"istio.io/istio/pkg/config"
)
func ApplyToVirtualService(cfg *config.Config, filter *v1alpha1.IstioFilter) (err error) {
rule := cfg.Spec.(*networking.VirtualService)
for _, change := range filter.Changes {
err = applyToVirtualServiceChange(rule, change)
if err != nil {
return err
}
}
return nil
}
func applyToVirtualServiceChange(vs *networking.VirtualService, change *v1alpha1.IstioFilter_Change) (err error) {
// prepare value
switch change.ApplyTo {
case v1alpha1.IstioFilter_HTTP_ROUTE:
return changeRoute(vs, change, applyToHTTPRoute)
case v1alpha1.IstioFilter_HTTP_ROUTE_FAULT:
return changeRoute(vs, change, applyToHTTPRouteFault)
}
return ErrUnknownContext
}
func changeRoute(vs *networking.VirtualService, change *v1alpha1.IstioFilter_Change, apply func(route *networking.HTTPRoute, patch *v1alpha1.IstioFilter_Patch) (*networking.HTTPRoute, error)) (err error) {
var defaultRoute *networking.HTTPRoute
var defaultIndex int
for i, route := range vs.Http {
if len(route.Match) == 0 {
defaultRoute = route
defaultIndex = i
}
}
switch change.Match.GetMatch().(type) {
case *v1alpha1.IstioFilter_Match_Simple:
switch change.Match.GetSimple() {
case v1alpha1.IstioFilter_ALL:
switch change.Patch.Operation {
case v1alpha1.IstioFilter_REMOVE,
v1alpha1.IstioFilter_REPLACE,
v1alpha1.IstioFilter_INSERT_BEFORE,
v1alpha1.IstioFilter_INSERT_AFTER:
return ErrUnsupportedOperation
}
// only support merge
for i, route := range vs.Http {
vs.Http[i], err = apply(route, change.Patch)
if err != nil {
return err
}
}
case v1alpha1.IstioFilter_DEFAULT:
if change.Patch.Operation == v1alpha1.IstioFilter_REMOVE {
return ErrUnsupportedOperation
}
if defaultRoute == nil {
return nil
}
applied, err := apply(defaultRoute, change.Patch)
if err != nil {
return err
}
switch change.Patch.Operation {
case v1alpha1.IstioFilter_INSERT_BEFORE:
temp := append(make([]*networking.HTTPRoute, 0, len(vs.Http)+1), vs.Http[:defaultIndex]...)
temp = append(temp, applied)
temp = append(temp, vs.Http[defaultIndex:]...)
vs.Http = temp
case v1alpha1.IstioFilter_INSERT_AFTER:
temp := append(make([]*networking.HTTPRoute, 0, len(vs.Http)+1), vs.Http[:defaultIndex+1]...)
temp = append(temp, applied)
temp = append(temp, vs.Http[defaultIndex+1:]...)
vs.Http = temp
case v1alpha1.IstioFilter_MERGE, v1alpha1.IstioFilter_REPLACE:
vs.Http[defaultIndex] = applied
}
}
case *v1alpha1.IstioFilter_Match_Selector:
if change.Match.GetSelector().Name == nil {
return nil
}
temp := make([]*networking.HTTPRoute, 0, len(vs.Http))
for _, route := range vs.Http {
if !change.Match.GetSelector().Name.MatchValue(route.Name) {
temp = append(temp, route)
continue
}
applied, err := apply(route, change.Patch)
if err != nil {
return err
}
if applied != nil {
switch change.Patch.Operation {
case v1alpha1.IstioFilter_INSERT_BEFORE:
temp = append(temp, applied, route)
case v1alpha1.IstioFilter_INSERT_AFTER:
temp = append(temp, route, applied)
case v1alpha1.IstioFilter_MERGE:
temp = append(temp, applied)
if route.Name != applied.Name {
temp = append(temp, route)
}
case v1alpha1.IstioFilter_REPLACE:
temp = append(temp, applied)
}
}
}
vs.Http = temp
}
return nil
}
func struct2Route(src *types.Struct) *networking.HTTPRoute {
srcJS, _ := (&jsonpb.Marshaler{}).MarshalToString(src)
v := &networking.HTTPRoute{}
_ = (&jsonpb.Unmarshaler{AllowUnknownFields: true}).Unmarshal(bytes.NewBufferString(srcJS), v)
return v
}
func mergeRoute(route *networking.HTTPRoute, src *types.Struct) *networking.HTTPRoute {
cloned := route.DeepCopy()
patchRoute := struct2Route(src)
if len(patchRoute.Route) != 0 {
cloned.Route = nil
}
if len(patchRoute.Match) != 0 {
cloned.Match = nil
}
proto.Merge(cloned, patchRoute)
return cloned
}
func applyToHTTPRoute(route *networking.HTTPRoute, patch *v1alpha1.IstioFilter_Patch) (*networking.HTTPRoute, error) {
switch patch.Operation {
case v1alpha1.IstioFilter_MERGE:
return mergeRoute(route, patch.Value), nil
case v1alpha1.IstioFilter_REPLACE,
v1alpha1.IstioFilter_INSERT_AFTER,
v1alpha1.IstioFilter_INSERT_BEFORE:
cp := &networking.HTTPRoute{}
merge(cp, patch.Value)
return cp, nil
case v1alpha1.IstioFilter_REMOVE:
return nil, nil
default:
return nil, ErrUnsupportedOperation
}
}
func applyToHTTPRouteFault(route *networking.HTTPRoute, patch *v1alpha1.IstioFilter_Patch) (*networking.HTTPRoute, error) {
switch patch.Operation {
case v1alpha1.IstioFilter_MERGE:
if route.Fault == nil {
route.Fault = &networking.HTTPFaultInjection{}
}
merge(route.Fault, patch.Value)
return route, nil
case v1alpha1.IstioFilter_REPLACE:
cp := &networking.HTTPFaultInjection{}
merge(cp, patch.Value)
route.Fault = cp
return route, nil
case v1alpha1.IstioFilter_REMOVE:
route.Fault = nil
return route, nil
default:
return nil, ErrUnsupportedOperation
}
}