c742ec03f5
* Upgrade antonmedv/expr to expr-lang/expr The project has moved. This also upgrades from 1.15.5 to 1.16.9. The expr project lacks a changelog but tests pass and the changes don't seem to change it much - but there were a lot of changes. Signed-off-by: Kevin Lyda <kevin@lyda.ie> * Upgrade build image In reviewing the build results I see the old build image was deprecated so upgrading to something newer. Signed-off-by: Kevin Lyda <kevin@lyda.ie> --------- Signed-off-by: Kevin Lyda <kevin@lyda.ie>
48 lines
1.3 KiB
Go
48 lines
1.3 KiB
Go
package view
|
|
|
|
import (
|
|
"context"
|
|
|
|
"github.com/coredns/coredns/plugin"
|
|
"github.com/coredns/coredns/plugin/pkg/expression"
|
|
"github.com/coredns/coredns/request"
|
|
|
|
"github.com/expr-lang/expr"
|
|
"github.com/expr-lang/expr/vm"
|
|
"github.com/miekg/dns"
|
|
)
|
|
|
|
// View is a plugin that enables configuring expression based advanced routing
|
|
type View struct {
|
|
progs []*vm.Program
|
|
viewName string
|
|
Next plugin.Handler
|
|
}
|
|
|
|
// Filter implements dnsserver.Viewer. It returns true if all View rules evaluate to true for the given state.
|
|
func (v *View) Filter(ctx context.Context, state *request.Request) bool {
|
|
env := expression.DefaultEnv(ctx, state)
|
|
for _, prog := range v.progs {
|
|
result, err := expr.Run(prog, env)
|
|
if err != nil {
|
|
return false
|
|
}
|
|
if b, ok := result.(bool); ok && b {
|
|
continue
|
|
}
|
|
// anything other than a boolean true result is considered false
|
|
return false
|
|
}
|
|
return true
|
|
}
|
|
|
|
// ViewName implements dnsserver.Viewer. It returns the view name
|
|
func (v *View) ViewName() string { return v.viewName }
|
|
|
|
// Name implements the Handler interface
|
|
func (*View) Name() string { return "view" }
|
|
|
|
// ServeDNS implements the Handler interface.
|
|
func (v *View) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
|
|
return plugin.NextOrFailure(v.Name(), v.Next, ctx, w, r)
|
|
}
|