Copy certifiers from light-client

certifiers/files/commit.go

@@ -0,0 +1,77 @@
+package files
+
+import (
+	"encoding/json"
+	"os"
+
+	"github.com/pkg/errors"
+
+	wire "github.com/tendermint/go-wire"
+
+	"github.com/tendermint/tendermint/certifiers"
+	certerr "github.com/tendermint/tendermint/certifiers/errors"
+)
+
+const (
+	// MaxFullCommitSize is the maximum number of bytes we will
+	// read in for a full commit to avoid excessive allocations
+	// in the deserializer
+	MaxFullCommitSize = 1024 * 1024
+)
+
+// SaveFullCommit exports the seed in binary / go-wire style
+func SaveFullCommit(fc certifiers.FullCommit, path string) error {
+	f, err := os.Create(path)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	defer f.Close()
+
+	var n int
+	wire.WriteBinary(fc, f, &n, &err)
+	return errors.WithStack(err)
+}
+
+// SaveFullCommitJSON exports the seed in a json format
+func SaveFullCommitJSON(fc certifiers.FullCommit, path string) error {
+	f, err := os.Create(path)
+	if err != nil {
+		return errors.WithStack(err)
+	}
+	defer f.Close()
+	stream := json.NewEncoder(f)
+	err = stream.Encode(fc)
+	return errors.WithStack(err)
+}
+
+func LoadFullCommit(path string) (certifiers.FullCommit, error) {
+	var fc certifiers.FullCommit
+	f, err := os.Open(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return fc, certerr.ErrCommitNotFound()
+		}
+		return fc, errors.WithStack(err)
+	}
+	defer f.Close()
+
+	var n int
+	wire.ReadBinaryPtr(&fc, f, MaxFullCommitSize, &n, &err)
+	return fc, errors.WithStack(err)
+}
+
+func LoadFullCommitJSON(path string) (certifiers.FullCommit, error) {
+	var fc certifiers.FullCommit
+	f, err := os.Open(path)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return fc, certerr.ErrCommitNotFound()
+		}
+		return fc, errors.WithStack(err)
+	}
+	defer f.Close()
+
+	stream := json.NewDecoder(f)
+	err = stream.Decode(&fc)
+	return fc, errors.WithStack(err)
+}