/
util.go
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/
util.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 exec
import (
"context"
"fmt"
"runtime/debug"
"github.com/apache/beam/sdks/v2/go/pkg/beam/internal/errors"
)
// GenID is a simple UnitID generator.
type GenID struct {
last int
}
// New returns a fresh ID.
func (g *GenID) New() UnitID {
g.last++
return UnitID(g.last)
}
type doFnError struct {
doFn string
err error
uid UnitID
pid string
}
func (e *doFnError) Error() string {
return fmt.Sprintf("DoFn[UID:%v, PID:%v, Name: %v] failed:\n%v", e.uid, e.pid, e.doFn, e.err)
}
// callNoPanic calls the given function and catches any panic.
func callNoPanic(ctx context.Context, fn func(context.Context) error) (err error) {
defer func() {
if r := recover(); r != nil {
// Check if the panic value is from a failed DoFn, and return it without a panic trace.
if e, ok := r.(*doFnError); ok {
err = e
} else {
// Top level error is the panic itself, but also include the stack trace as the original error.
// Higher levels can then add appropriate context without getting pushed down by the stack trace.
err = errors.SetTopLevelMsgf(errors.Errorf("panic: %v %s", r, debug.Stack()), "panic: %v", r)
}
}
}()
return fn(ctx)
}
// MultiStartBundle calls StartBundle on multiple nodes. Convenience function.
func MultiStartBundle(ctx context.Context, id string, data DataContext, list ...Node) error {
for _, n := range list {
if err := n.StartBundle(ctx, id, data); err != nil {
return err
}
}
return nil
}
// MultiFinishBundle calls FinishBundle on multiple nodes. Convenience function.
func MultiFinishBundle(ctx context.Context, list ...Node) error {
for _, n := range list {
if err := n.FinishBundle(ctx); err != nil {
return err
}
}
return nil
}
// IDs returns the unit IDs of the given nodes.
func IDs(list ...Node) []UnitID {
var ret []UnitID
for _, n := range list {
ret = append(ret, n.ID())
}
return ret
}