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server.go
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server.go
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// Copyright 2022 The kpt 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 main
import (
"flag"
"fmt"
"net"
"os"
"strings"
"time"
pb "github.com/GoogleContainerTools/kpt/porch/func/evaluator"
"github.com/GoogleContainerTools/kpt/porch/func/healthchecker"
"github.com/GoogleContainerTools/kpt/porch/func/internal"
"google.golang.org/grpc"
"google.golang.org/grpc/health/grpc_health_v1"
"k8s.io/klog/v2"
)
const (
execRuntime = "exec"
podRuntime = "pod"
wrapperServerImageEnv = "WRAPPER_SERVER_IMAGE"
)
var (
port = flag.Int("port", 9445, "The server port")
functions = flag.String("functions", "./functions", "Path to cached functions.")
config = flag.String("config", "./config.yaml", "Path to the config file.")
podCacheConfig = flag.String("pod-cache-config", "/pod-cache-config/pod-cache-config.yaml", "Path to the pod cache config file. The file is map of function name to TTL.")
podNamespace = flag.String("pod-namespace", "porch-fn-system", "Namespace to run KRM functions pods.")
podTTL = flag.Duration("pod-ttl", 30*time.Minute, "TTL for pods before GC.")
scanInterval = flag.Duration("scan-interval", time.Minute, "The interval of GC between scans.")
disableRuntimes = flag.String("disable-runtimes", "", fmt.Sprintf("The runtime(s) to disable. Multiple runtimes should separated by `,`. Available runtimes: `%v`, `%v`.", execRuntime, podRuntime))
)
func main() {
flag.Parse()
if err := run(); err != nil {
fmt.Fprintf(os.Stderr, "unexpected error: %v\n", err)
os.Exit(1)
}
}
func run() error {
address := fmt.Sprintf(":%d", *port)
lis, err := net.Listen("tcp", address)
if err != nil {
return fmt.Errorf("failed to listen: %w", err)
}
availableRuntimes := map[string]struct{}{
execRuntime: {},
podRuntime: {},
}
if disableRuntimes != nil {
runtimesFromFlag := strings.Split(*disableRuntimes, ",")
for _, rt := range runtimesFromFlag {
delete(availableRuntimes, rt)
}
}
runtimes := []internal.Evaluator{}
for rt := range availableRuntimes {
switch rt {
case execRuntime:
execEval, err := internal.NewExecutableEvaluator(*functions, *config)
if err != nil {
return fmt.Errorf("failed to initialize executable evaluator: %w", err)
}
runtimes = append(runtimes, execEval)
case podRuntime:
wrapperServerImage := os.Getenv(wrapperServerImageEnv)
if wrapperServerImage == "" {
return fmt.Errorf("environment variable %v must be set to use pod function evaluator runtime", wrapperServerImageEnv)
}
podEval, err := internal.NewPodEvaluator(*podNamespace, wrapperServerImage, *scanInterval, *podTTL, *podCacheConfig)
if err != nil {
return fmt.Errorf("failed to initialize pod evaluator: %w", err)
}
runtimes = append(runtimes, podEval)
}
}
if len(runtimes) == 0 {
klog.Warning("no runtime is enabled in function-runner")
}
evaluator := internal.NewMultiEvaluator(runtimes...)
klog.Infof("Listening on %s", address)
// Start the gRPC server
server := grpc.NewServer()
pb.RegisterFunctionEvaluatorServer(server, evaluator)
healthService := healthchecker.NewHealthChecker()
grpc_health_v1.RegisterHealthServer(server, healthService)
if err := server.Serve(lis); err != nil {
return fmt.Errorf("server failed: %w", err)
}
return nil
}