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|
// Package main provides a sigsum-log-go binary
package main
import (
"context"
"crypto"
"crypto/ed25519"
"encoding/hex"
"flag"
"fmt"
"net/http"
"os"
"os/signal"
"strings"
"sync"
"syscall"
"time"
"github.com/golang/glog"
"github.com/google/trillian"
"github.com/prometheus/client_golang/prometheus/promhttp"
"google.golang.org/grpc"
"git.sigsum.org/sigsum-lib-go/pkg/types"
"git.sigsum.org/sigsum-log-go/pkg/db"
"git.sigsum.org/sigsum-log-go/pkg/dns"
"git.sigsum.org/sigsum-log-go/pkg/instance"
"git.sigsum.org/sigsum-log-go/pkg/state"
)
var (
httpEndpoint = flag.String("http_endpoint", "localhost:6965", "host:port specification of where sigsum-log-go serves clients")
rpcBackend = flag.String("log_rpc_server", "localhost:6962", "host:port specification of where Trillian serves clients")
prefix = flag.String("prefix", "", "a prefix that proceeds /sigsum/v0/<endpoint>")
trillianID = flag.Int64("trillian_id", 0, "log identifier in the Trillian database")
deadline = flag.Duration("deadline", time.Second*10, "deadline for backend requests")
key = flag.String("key", "", "hex-encoded Ed25519 signing key")
witnesses = flag.String("witnesses", "", "comma-separated list of trusted witness verification keys in hex")
maxRange = flag.Int64("max_range", 10, "maximum number of entries that can be retrived in a single request")
interval = flag.Duration("interval", time.Second*30, "interval used to rotate the log's cosigned STH")
shardStart = flag.Int64("shard_interval_start", 0, "start of shard interval since the UNIX epoch in seconds")
gitCommit = "unknown"
)
func main() {
flag.Parse()
defer glog.Flush()
glog.Infof("sigsum-log-go git-commit %s", gitCommit)
// wait for clean-up before exit
var wg sync.WaitGroup
defer wg.Wait()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
glog.V(3).Infof("configuring sigsum-log-go instance...")
instance, err := setupInstanceFromFlags()
if err != nil {
glog.Errorf("setupInstance: %v", err)
return
}
glog.V(3).Infof("spawning state manager")
go func() {
wg.Add(1)
defer wg.Done()
instance.Stateman.Run(ctx)
glog.Errorf("state manager shutdown")
cancel() // must have state manager running
}()
glog.V(3).Infof("spawning await")
server := http.Server{Addr: *httpEndpoint}
go await(ctx, func() {
wg.Add(1)
defer wg.Done()
ctxInner, _ := context.WithTimeout(ctx, time.Second*60)
glog.Infof("Shutting down HTTP server...")
server.Shutdown(ctxInner)
glog.V(3).Infof("HTTP server shutdown")
glog.Infof("Shutting down spawned go routines...")
cancel()
})
glog.Infof("Serving on %v/%v", *httpEndpoint, *prefix)
if err = server.ListenAndServe(); err != http.ErrServerClosed {
glog.Errorf("ListenAndServe: %v", err)
}
}
// SetupInstance sets up a new sigsum-log-go instance from flags
func setupInstanceFromFlags() (*instance.Instance, error) {
var i instance.Instance
var err error
// Setup log configuration
i.Signer, i.LogID, err = newLogIdentity(*key)
if err != nil {
return nil, fmt.Errorf("newLogIdentity: %v", err)
}
i.TreeID = *trillianID
i.Prefix = *prefix
i.MaxRange = *maxRange
i.Deadline = *deadline
i.Interval = *interval
i.ShardStart = uint64(*shardStart)
if *shardStart < 0 {
return nil, fmt.Errorf("shard start must be larger than zero")
}
i.Witnesses, err = newWitnessMap(*witnesses)
if err != nil {
return nil, fmt.Errorf("newWitnessMap: %v", err)
}
// Setup log client
dialOpts := []grpc.DialOption{grpc.WithInsecure(), grpc.WithBlock(), grpc.WithTimeout(i.Deadline)}
conn, err := grpc.Dial(*rpcBackend, dialOpts...)
if err != nil {
return nil, fmt.Errorf("Dial: %v", err)
}
i.Client = &db.TrillianClient{
TreeID: i.TreeID,
GRPC: trillian.NewTrillianLogClient(conn),
}
// Setup state manager
i.Stateman, err = state.NewStateManagerSingle(i.Client, i.Signer, i.Interval, i.Deadline)
if err != nil {
return nil, fmt.Errorf("NewStateManager: %v", err)
}
// Setup DNS verifier
i.DNS = dns.NewDefaultResolver()
// Register HTTP endpoints
mux := http.NewServeMux()
http.Handle("/", mux)
for _, handler := range i.Handlers() {
glog.V(3).Infof("adding handler: %s", handler.Path())
mux.Handle(handler.Path(), handler)
}
glog.V(3).Infof("Adding prometheus handler on path: /metrics")
http.Handle("/metrics", promhttp.Handler())
return &i, nil
}
func newLogIdentity(key string) (crypto.Signer, string, error) {
buf, err := hex.DecodeString(key)
if err != nil {
return nil, "", fmt.Errorf("DecodeString: %v", err)
}
sk := crypto.Signer(ed25519.PrivateKey(buf))
vk := sk.Public().(ed25519.PublicKey)
return sk, hex.EncodeToString([]byte(vk[:])), nil
}
// newWitnessMap creates a new map of trusted witnesses
func newWitnessMap(witnesses string) (map[types.Hash]types.PublicKey, error) {
w := make(map[types.Hash]types.PublicKey)
if len(witnesses) > 0 {
for _, witness := range strings.Split(witnesses, ",") {
b, err := hex.DecodeString(witness)
if err != nil {
return nil, fmt.Errorf("DecodeString: %v", err)
}
var vk types.PublicKey
if n := copy(vk[:], b); n != types.PublicKeySize {
return nil, fmt.Errorf("Invalid verification key size: %v", n)
}
w[*types.HashFn(vk[:])] = vk
}
}
return w, nil
}
// await waits for a shutdown signal and then runs a clean-up function
func await(ctx context.Context, done func()) {
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)
select {
case <-sigs:
case <-ctx.Done():
}
glog.V(3).Info("received shutdown signal")
done()
}
|
