github.com/bartle-stripe/trillian@v1.2.1/storage/tools/log_client/main.go (about)

     1  // Copyright 2016 Google Inc. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // The log_client binary retrieves leaves from a log.
    16  package main
    17  
    18  import (
    19  	"context"
    20  	"flag"
    21  	"fmt"
    22  	"time"
    23  
    24  	"github.com/golang/glog"
    25  	"github.com/google/trillian"
    26  	"google.golang.org/grpc"
    27  )
    28  
    29  var (
    30  	treeIDFlag     = flag.Int64("treeid", 3, "The tree id to use")
    31  	serverPortFlag = flag.Int("port", 8090, "Log server port (must be on localhost)")
    32  	startLeafFlag  = flag.Int64("start_leaf", 0, "The first leaf index to fetch")
    33  	numLeavesFlag  = flag.Int64("num_leaves", 1, "The number of leaves to fetch")
    34  )
    35  
    36  func buildGetLeavesByIndexRequest(logID int64, startLeaf, numLeaves int64) *trillian.GetLeavesByIndexRequest {
    37  	if startLeaf < 0 || numLeaves <= 0 {
    38  		panic("Start leaf index and num_leaves must be >= 0")
    39  	}
    40  
    41  	var leafIndices []int64
    42  
    43  	for l := int64(0); l < numLeaves; l++ {
    44  		leafIndices = append(leafIndices, l+startLeaf)
    45  	}
    46  
    47  	return &trillian.GetLeavesByIndexRequest{LogId: logID, LeafIndex: leafIndices}
    48  }
    49  
    50  // TODO: Move this code out to a better place when we tidy up the initial test main stuff
    51  // It's just a basic skeleton at the moment.
    52  func main() {
    53  	flag.Parse()
    54  	defer glog.Flush()
    55  
    56  	ctx := context.Background()
    57  
    58  	// TODO: Other options apart from insecure connections
    59  	port := *serverPortFlag
    60  	dialCtx, cancel := context.WithTimeout(ctx, time.Second*5)
    61  	defer cancel()
    62  	conn, err := grpc.DialContext(dialCtx, fmt.Sprintf("localhost:%d", port), grpc.WithInsecure())
    63  
    64  	if err != nil {
    65  		panic(err)
    66  	}
    67  
    68  	defer conn.Close()
    69  
    70  	client := trillian.NewTrillianLogClient(conn)
    71  
    72  	req := buildGetLeavesByIndexRequest(*treeIDFlag, *startLeafFlag, *numLeavesFlag)
    73  	getLeafByIndexResponse, err := client.GetLeavesByIndex(ctx, req)
    74  
    75  	if err != nil {
    76  		fmt.Printf("Got error in call: %v", err)
    77  	} else {
    78  		fmt.Printf("Got server response: %v", getLeafByIndexResponse)
    79  	}
    80  }