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boot.go
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boot.go
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// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You 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 (
"context"
"flag"
"io"
"log"
"os"
"path/filepath"
"strings"
"github.com/apache/beam/sdks/go/pkg/beam/artifact"
"github.com/apache/beam/sdks/go/pkg/beam/provision"
"github.com/apache/beam/sdks/go/pkg/beam/util/execx"
"github.com/apache/beam/sdks/go/pkg/beam/util/grpcx"
)
var (
// Contract: https://s.apache.org/beam-fn-api-container-contract.
id = flag.String("id", "", "Local identifier (required).")
loggingEndpoint = flag.String("logging_endpoint", "", "Local logging endpoint for FnHarness (required).")
artifactEndpoint = flag.String("artifact_endpoint", "", "Local artifact endpoint for FnHarness (required).")
provisionEndpoint = flag.String("provision_endpoint", "", "Local provision endpoint for FnHarness (required).")
controlEndpoint = flag.String("control_endpoint", "", "Local control endpoint for FnHarness (required).")
semiPersistDir = flag.String("semi_persist_dir", "/tmp", "Local semi-persistent directory (optional).")
)
func main() {
flag.Parse()
if *id == "" {
log.Fatal("No id provided.")
}
if *provisionEndpoint == "" {
log.Fatal("No provision endpoint provided.")
}
ctx := grpcx.WriteWorkerID(context.Background(), *id)
info, err := provision.Info(ctx, *provisionEndpoint)
if err != nil {
log.Fatalf("Failed to obtain provisioning information: %v", err)
}
log.Printf("Provision info:\n%v", info)
// TODO(BEAM-8201): Simplify once flags are no longer used.
if info.GetLoggingEndpoint().GetUrl() != "" {
*loggingEndpoint = info.GetLoggingEndpoint().GetUrl()
}
if info.GetArtifactEndpoint().GetUrl() != "" {
*artifactEndpoint = info.GetArtifactEndpoint().GetUrl()
}
if info.GetControlEndpoint().GetUrl() != "" {
*controlEndpoint = info.GetControlEndpoint().GetUrl()
}
if *loggingEndpoint == "" {
log.Fatal("No logging endpoint provided.")
}
if *artifactEndpoint == "" {
log.Fatal("No artifact endpoint provided.")
}
if *controlEndpoint == "" {
log.Fatal("No control endpoint provided.")
}
log.Printf("Initializing Go harness: %v", strings.Join(os.Args, " "))
// (1) Obtain the pipeline options
options, err := provision.ProtoToJSON(info.GetPipelineOptions())
if err != nil {
log.Fatalf("Failed to convert pipeline options: %v", err)
}
// (2) Retrieve the staged files.
//
// The Go SDK harness downloads the worker binary and invokes
// it. The binary is required to be keyed as "worker", if there
// are more than one artifact.
dir := filepath.Join(*semiPersistDir, "staged")
artifacts, err := artifact.Materialize(ctx, *artifactEndpoint, info.GetDependencies(), info.GetRetrievalToken(), dir)
if err != nil {
log.Fatalf("Failed to retrieve staged files: %v", err)
}
const worker = "worker"
name := worker
switch len(artifacts) {
case 0:
log.Fatal("No artifacts staged")
case 1:
name, _ = artifact.MustExtractFilePayload(artifacts[0])
default:
found := false
for _, a := range artifacts {
n, _ := artifact.MustExtractFilePayload(a)
if n == worker {
found = true
break
}
}
if !found {
log.Fatalf("No artifact named '%v' found", worker)
}
}
// (3) The persist dir may be on a noexec volume, so we must
// copy the binary to a different location to execute.
const prog = "/bin/worker"
if err := copyExe(filepath.Join(dir, name), prog); err != nil {
log.Fatalf("Failed to copy worker binary: %v", err)
}
args := []string{
"--worker=true",
"--id=" + *id,
"--logging_endpoint=" + *loggingEndpoint,
"--control_endpoint=" + *controlEndpoint,
"--semi_persist_dir=" + *semiPersistDir,
"--options=" + options,
}
if info.GetStatusEndpoint() != nil {
args = append(args, "--status_endpoint="+info.GetStatusEndpoint().GetUrl())
}
log.Fatalf("User program exited: %v", execx.Execute(prog, args...))
}
func copyExe(from, to string) error {
src, err := os.Open(from)
if err != nil {
return err
}
defer src.Close()
dst, err := os.OpenFile(to, os.O_WRONLY|os.O_CREATE, 0755)
if err != nil {
return err
}
if _, err := io.Copy(dst, src); err != nil {
return err
}
return dst.Close()
}