99 lines
3.2 KiB
Go
99 lines
3.2 KiB
Go
package main
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import (
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"context"
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"errors"
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"flag"
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"fmt"
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"io"
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"os"
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"os/signal"
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"strings"
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"syscall"
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"proxy-pool/internal/config"
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"proxy-pool/internal/gateway/bootstrap"
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"proxy-pool/internal/platform/logging"
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)
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const (
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configEnvironment = "PROXY_POOL_CONFIG"
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controlPlaneAddressEnvironment = "PROXY_POOL_CONTROL_PLANE_ADDRESS"
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clusterIDEnvironment = "PROXY_POOL_CLUSTER_ID"
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workerIDEnvironment = "PROXY_POOL_WORKER_ID"
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instanceIDEnvironment = "PROXY_POOL_INSTANCE_ID"
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zoneEnvironment = "PROXY_POOL_ZONE"
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)
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type environmentLookup func(string) string
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type gatewayRun func(context.Context, bootstrap.Options) error
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func main() {
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ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
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defer stop()
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os.Exit(execute(ctx, os.Args[1:], os.Getenv, bootstrap.Run, os.Stderr))
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}
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func execute(
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ctx context.Context,
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args []string,
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getenv environmentLookup,
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run gatewayRun,
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stderr io.Writer,
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) int {
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flags := flag.NewFlagSet("proxy-gateway", flag.ContinueOnError)
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flags.SetOutput(stderr)
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configPath := flags.String("config", "", "configuration file path")
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controlPlaneAddress := flags.String("control-plane", "", "remote Controller control-plane address")
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clusterID := flags.String("cluster-id", "", "cluster identifier")
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workerID := flags.String("worker-id", "", "unique Worker identifier")
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instanceID := flags.String("instance-id", "", "unique process instance identifier")
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zone := flags.String("zone", "", "availability zone identifier")
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if err := flags.Parse(args); err != nil {
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if errors.Is(err, flag.ErrHelp) {
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return 0
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}
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return 2
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}
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if flags.NArg() != 0 {
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_, _ = fmt.Fprintln(stderr, "proxy-gateway: unexpected positional arguments")
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return 2
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}
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if getenv != nil {
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setIfEmpty(configPath, getenv(configEnvironment))
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setIfEmpty(controlPlaneAddress, getenv(controlPlaneAddressEnvironment))
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setIfEmpty(clusterID, getenv(clusterIDEnvironment))
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setIfEmpty(workerID, getenv(workerIDEnvironment))
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setIfEmpty(instanceID, getenv(instanceIDEnvironment))
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setIfEmpty(zone, getenv(zoneEnvironment))
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}
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if ctx == nil || run == nil || !validValue(*configPath) || !validValue(*controlPlaneAddress) ||
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!validValue(*clusterID) || !validValue(*workerID) || !validValue(*instanceID) || !validValue(*zone) {
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_, _ = fmt.Fprintf(stderr,
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"proxy-gateway: -config, -control-plane, -cluster-id, -worker-id, -instance-id and -zone are required; "+
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"environment fallbacks: %s, %s, %s, %s, %s, %s\n",
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configEnvironment, controlPlaneAddressEnvironment, clusterIDEnvironment, workerIDEnvironment, instanceIDEnvironment, zoneEnvironment,
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)
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return 2
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}
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err := run(ctx, bootstrap.Options{
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ConfigPath: *configPath, Resolver: config.OSResolver{}, ControlPlaneAddress: *controlPlaneAddress,
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ClusterID: *clusterID, WorkerID: *workerID, InstanceID: *instanceID, Zone: *zone,
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})
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if err == nil || (errors.Is(err, context.Canceled) && ctx.Err() != nil) {
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return 0
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}
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logging.WriteProcessError(stderr, "proxy-gateway", err)
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return 1
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}
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func setIfEmpty(target *string, value string) {
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if target != nil && *target == "" {
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*target = value
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}
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}
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func validValue(value string) bool {
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return value != "" && strings.TrimSpace(value) == value
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}
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