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server.go
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server.go
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package main
import (
"fmt"
"log"
"os"
srv "github.com/datawire/ambassador/cmd/kat-server/services"
)
const (
// Crt certificate file.
Crt = "server.crt"
// Key private key file.
Key = "server.key"
// Port non-secure port.
Port int16 = 8080
// SSLPort secure port.
SSLPort int16 = 8443
)
func main() {
listeners := make([]srv.Service, 0)
var s srv.Service
t := os.Getenv("KAT_BACKEND_TYPE")
if len(t) <= 0 {
t = "http"
}
log.Printf("Running as type %s", t)
switch t {
case "grpc_echo":
s = &srv.GRPC{
Port: Port,
Backend: os.Getenv("BACKEND"),
SecurePort: SSLPort,
SecureBackend: os.Getenv("BACKEND"),
Cert: Crt,
Key: Key,
}
listeners = append(listeners, s)
case "grpc_auth":
protocolVersion := os.Getenv("GRPC_AUTH_PROTOCOL_VERSION")
if protocolVersion == "v3" {
s = &srv.GRPCAUTHV3{
Port: Port,
Backend: os.Getenv("BACKEND"),
SecurePort: SSLPort,
SecureBackend: os.Getenv("BACKEND"),
Cert: Crt,
Key: Key,
ProtocolVersion: protocolVersion,
}
} else {
s = &srv.GRPCAUTH{
Port: Port,
Backend: os.Getenv("BACKEND"),
SecurePort: SSLPort,
SecureBackend: os.Getenv("BACKEND"),
Cert: Crt,
Key: Key,
ProtocolVersion: protocolVersion,
}
}
listeners = append(listeners, s)
case "grpc_rls":
protocolVersion := os.Getenv("GRPC_RLS_PROTOCOL_VERSION")
if protocolVersion == "v3" {
s = &srv.GRPCRLSV3{
Port: Port,
Backend: os.Getenv("BACKEND"),
SecurePort: SSLPort,
SecureBackend: os.Getenv("BACKEND"),
Cert: Crt,
Key: Key,
ProtocolVersion: protocolVersion,
}
} else {
s = &srv.GRPCRLS{
Port: Port,
Backend: os.Getenv("BACKEND"),
SecurePort: SSLPort,
SecureBackend: os.Getenv("BACKEND"),
Cert: Crt,
Key: Key,
ProtocolVersion: protocolVersion,
}
}
listeners = append(listeners, s)
case "grpc_agent":
s = &srv.GRPCAgent{
Port: Port,
}
listeners = append(listeners, s)
default:
port := Port
securePort := SSLPort
for {
eName := fmt.Sprintf("BACKEND_%d", port)
clearBackend := os.Getenv(eName)
log.Printf("clear: checking %s -- %s", eName, clearBackend)
if len(clearBackend) <= 0 {
if port == 8080 {
// Default for backwards compatibility.
clearBackend = os.Getenv("BACKEND")
log.Printf("clear: fallback to BACKEND -- %s", clearBackend)
}
}
if len(clearBackend) <= 0 {
log.Printf("clear: bailing, no backend")
break
}
eName = fmt.Sprintf("BACKEND_%d", securePort)
secureBackend := os.Getenv(eName)
log.Printf("secure: checking %s -- %s", eName, secureBackend)
if len(secureBackend) <= 0 {
if securePort == 8443 {
// Default for backwards compatibility.
secureBackend = os.Getenv("BACKEND")
log.Printf("secure: fallback to BACKEND -- %s", clearBackend)
}
}
if len(secureBackend) <= 0 {
log.Printf("secure: bailing, no backend")
break
}
if clearBackend != secureBackend {
log.Printf("BACKEND_%d and BACKEND_%d do not match", port, securePort)
} else {
log.Printf("creating HTTP listener for %s on ports %d/%d", clearBackend, port, securePort)
s = &srv.HTTP{
Port: port,
Backend: clearBackend,
SecurePort: securePort,
SecureBackend: secureBackend,
Cert: Crt,
Key: Key,
}
listeners = append(listeners, s)
}
port++
securePort++
}
}
if len(listeners) > 0 {
var waitFor <-chan bool
first := true
for _, s := range listeners {
c := s.Start()
if first {
waitFor = c
first = false
}
}
<-waitFor
} else {
log.Fatal("no listeners, exiting")
}
}