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route.go
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route.go
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// Copyright 2018 Istio Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package configdump
import (
"encoding/json"
"fmt"
"sort"
"strconv"
"text/tabwriter"
xdsapi "github.com/envoyproxy/go-control-plane/envoy/api/v2"
protio "istio.io/istio/istioctl/pkg/util/proto"
)
// RouteFilter is used to pass filter information into route based config writer print functions
type RouteFilter struct {
Name string
}
// Verify returns true if the passed route matches the filter fields
func (r *RouteFilter) Verify(route *xdsapi.RouteConfiguration) bool {
if r.Name != "" && r.Name != route.Name {
return false
}
return true
}
// PrintRouteSummary prints a summary of the relevant routes in the config dump to the ConfigWriter stdout
func (c *ConfigWriter) PrintRouteSummary(filter RouteFilter) error {
w, routes, err := c.setupRouteConfigWriter()
if err != nil {
return err
}
fmt.Fprintln(c.Stdout, "NOTE: This output only contains routes loaded via RDS.")
fmt.Fprintln(w, "NAME\tVIRTUAL HOSTS")
for _, route := range routes {
if filter.Verify(route) {
fmt.Fprintf(w, "%v\t%v\n", route.Name, len(route.GetVirtualHosts()))
}
}
return w.Flush()
}
// PrintRouteDump prints the relevant routes in the config dump to the ConfigWriter stdout
func (c *ConfigWriter) PrintRouteDump(filter RouteFilter) error {
_, routes, err := c.setupRouteConfigWriter()
if err != nil {
return err
}
filteredRoutes := protio.MessageSlice{}
for _, route := range routes {
if filter.Verify(route) {
filteredRoutes = append(filteredRoutes, route)
}
}
out, err := json.MarshalIndent(filteredRoutes, "", " ")
if err != nil {
return err
}
fmt.Fprintln(c.Stdout, string(out))
return nil
}
func (c *ConfigWriter) setupRouteConfigWriter() (*tabwriter.Writer, []*xdsapi.RouteConfiguration, error) {
routes, err := c.retrieveSortedRouteSlice()
if err != nil {
return nil, nil, err
}
w := new(tabwriter.Writer).Init(c.Stdout, 0, 8, 5, ' ', 0)
return w, routes, nil
}
func (c *ConfigWriter) retrieveSortedRouteSlice() ([]*xdsapi.RouteConfiguration, error) {
if c.configDump == nil {
return nil, fmt.Errorf("config writer has not been primed")
}
routeDump, err := c.configDump.GetRouteConfigDump()
if err != nil {
return nil, err
}
routes := []*xdsapi.RouteConfiguration{}
for _, route := range routeDump.DynamicRouteConfigs {
routes = append(routes, route.RouteConfig)
}
for _, route := range routeDump.StaticRouteConfigs {
routes = append(routes, route.RouteConfig)
}
if len(routes) == 0 {
return nil, fmt.Errorf("no routes found")
}
sort.Slice(routes, func(i, j int) bool {
iName, err := strconv.Atoi(routes[i].Name)
if err != nil {
return false
}
jName, err := strconv.Atoi(routes[j].Name)
if err != nil {
return false
}
return iName < jName
})
return routes, nil
}