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// Copyright 2018 Google LLC. 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 client
import (
"context"
"fmt"
"time"
"github.com/google/trillian"
"github.com/google/trillian/client/backoff"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"k8s.io/klog/v2"
)
// CreateAndInitTree uses the adminClient and logClient to create the tree
// described by req.
// If req describes a LOG tree, then this function will also call the InitLog
// function using logClient.
// Internally, the function will continue to retry failed requests until either
// the tree is created (and if necessary, initialised) successfully, or ctx is
// cancelled.
func CreateAndInitTree(
ctx context.Context,
req *trillian.CreateTreeRequest,
adminClient trillian.TrillianAdminClient,
logClient trillian.TrillianLogClient) (*trillian.Tree, error) {
b := &backoff.Backoff{
Min: 100 * time.Millisecond,
Max: 10 * time.Second,
Factor: 2,
Jitter: true,
}
var tree *trillian.Tree
err := b.Retry(ctx, func() error {
klog.Info("CreateTree...")
var err error
tree, err = adminClient.CreateTree(ctx, req)
switch code := status.Code(err); code {
case codes.Unavailable:
klog.Errorf("Admin server unavailable: %v", err)
return err
case codes.OK:
return nil
default:
klog.Errorf("failed to CreateTree(%+v): %T %v", req, err, err)
return err
}
})
if err != nil {
return nil, err
}
switch tree.TreeType {
case trillian.TreeType_LOG, trillian.TreeType_PREORDERED_LOG:
if err := InitLog(ctx, tree, logClient); err != nil {
return nil, err
}
default:
return nil, fmt.Errorf("don't know how or whether to initialise tree type %v", tree.TreeType)
}
return tree, nil
}
// InitLog initialises a freshly created Log tree.
func InitLog(ctx context.Context, tree *trillian.Tree, logClient trillian.TrillianLogClient) error {
if tree.TreeType != trillian.TreeType_LOG &&
tree.TreeType != trillian.TreeType_PREORDERED_LOG {
return fmt.Errorf("InitLog called with tree of type %v", tree.TreeType)
}
b := &backoff.Backoff{
Min: 100 * time.Millisecond,
Max: 10 * time.Second,
Factor: 2,
Jitter: true,
}
err := b.Retry(ctx, func() error {
klog.Infof("Initialising Log %v...", tree.TreeId)
req := &trillian.InitLogRequest{LogId: tree.TreeId}
resp, err := logClient.InitLog(ctx, req)
switch code := status.Code(err); code {
case codes.Unavailable:
klog.Errorf("Log server unavailable: %v", err)
return err
case codes.AlreadyExists:
klog.Warningf("Bizarrely, the just-created Log (%v) is already initialised!: %v", tree.TreeId, err)
return err
case codes.OK:
klog.Infof("Initialised Log (%v) with new SignedTreeHead:\n%+v",
tree.TreeId, resp.Created)
return nil
default:
klog.Errorf("failed to InitLog(%+v): %T %v", req, err, err)
return err
}
})
if err != nil {
return err
}
// Wait for log root to become available.
return b.Retry(ctx, func() error {
_, err := logClient.GetLatestSignedLogRoot(ctx,
&trillian.GetLatestSignedLogRootRequest{LogId: tree.TreeId})
return err
}, codes.FailedPrecondition)
}
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