forked from google/certificate-transparency-go
/
util.go
77 lines (69 loc) · 2.39 KB
/
util.go
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// Copyright 2018 Google Inc. All Rights Reserved.
//
// 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 core
import (
"context"
"fmt"
"os"
"os/signal"
"syscall"
"github.com/golang/glog"
ct "github.com/google/certificate-transparency-go"
"github.com/google/certificate-transparency-go/trillian/util"
"github.com/google/certificate-transparency-go/x509"
"github.com/google/trillian"
)
func buildLogLeaf(logPrefix string, index int64, entry *ct.LeafEntry) (*trillian.LogLeaf, error) {
logEntry, err := ct.LogEntryFromLeaf(index, entry)
if _, ok := err.(x509.NonFatalErrors); !ok && err != nil {
return nil, fmt.Errorf("failed to build LogEntry: %v", err)
}
// TODO(pavelkalinnikov): Verify the cert chain.
var cert ct.ASN1Cert
isPrecert := false
switch {
case logEntry.X509Cert != nil:
cert = ct.ASN1Cert{Data: logEntry.X509Cert.Raw}
case logEntry.Precert != nil:
isPrecert = true
cert = logEntry.Precert.Submitted
default:
return nil, fmt.Errorf("entry at %d is neither cert nor pre-cert", index)
}
leaf, err := util.BuildLogLeaf(logPrefix, logEntry.Leaf, logEntry.Index, cert, logEntry.Chain, isPrecert)
if err != nil {
return nil, fmt.Errorf("failed to build LogLeaf: %v", err)
}
return &leaf, nil
}
// WithSignalCancel acts like context.WithCancel(), but it also automatically
// invokes cancel if a termination signal (SIGINT/SIGTERM) is received by the
// process.
func WithSignalCancel(ctx context.Context) (context.Context, context.CancelFunc) {
ctx, cancel := context.WithCancel(ctx)
go func() {
// Subscribe for the standard set of signals used to terminate a server.
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
defer signal.Stop(sigs)
// Wait for a signal or explicit context cancellation.
select {
case sig := <-sigs:
glog.Warningf("Signal received: %v", sig)
cancel()
case <-ctx.Done():
}
}()
return ctx, cancel
}