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More grpc LB tweaks

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Signed-off-by: Miek Gieben <miek@miek.nl>
This commit is contained in:
Miek Gieben
2020-03-30 16:10:07 +02:00
parent 494227d95f
commit fafb347966
2 changed files with 17 additions and 8 deletions
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9
plugin/traffic/grpc_lb.go
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@@ -1,16 +1,19 @@
package traffic
import (
"fmt"
"github.com/miekg/dns"
)
// See https://github.com/grpc/grpc/blob/master/doc/service_config.md for the fields in this proto.
// We encode it as json and return it in a TXT field.
var lbTXT = `grpc_config=[{"serviceConfig":{"loadBalancingConfig":[{"eds_experimental":{"LrsLoadReportingServerName":"","Cluster": "xds"}}]}}]`
// TOOD(miek): balancer name should not be hardcoded
var lbTXT = `grpc_config=[{"serviceConfig":{"loadBalancingConfig":[{"eds_experimental":{"Cluster": "xds", "EDSServiceName":"%s", "BalancerName":"xds"}}]}}]`
func txt(z string) []dns.RR {
func txt(z, cluster string) []dns.RR {
return []dns.RR{&dns.TXT{
Hdr: dns.RR_Header{Name: z, Rrtype: dns.TypeTXT, Class: dns.ClassINET, Ttl: 5},
Txt: []string{lbTXT},
Txt: []string{fmt.Sprintf(lbTXT, cluster)},
}}
}