From 9ba9fe818d252ee9770371f0ccad68e3d09fbf5c Mon Sep 17 00:00:00 2001
From: Nick Johnson <arachnid@notdot.net>
Date: Mon, 12 Dec 2016 15:08:23 +0000
Subject: cmd/utils, eth: Add gzip support for chain dump and restore

---
 cmd/utils/cmd.go | 31 ++++++++++++++++++++++++++++---
 eth/api.go       | 19 +++++++++++++++++--
 2 files changed, 45 insertions(+), 5 deletions(-)

diff --git a/cmd/utils/cmd.go b/cmd/utils/cmd.go
index 584afc804..a56507e4d 100644
--- a/cmd/utils/cmd.go
+++ b/cmd/utils/cmd.go
@@ -18,12 +18,14 @@
 package utils
 
 import (
+	"compress/gzip"
 	"fmt"
 	"io"
 	"os"
 	"os/signal"
 	"regexp"
 	"runtime"
+	"strings"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
@@ -133,7 +135,15 @@ func ImportChain(chain *core.BlockChain, fn string) error {
 		return err
 	}
 	defer fh.Close()
-	stream := rlp.NewStream(fh, 0)
+
+	var reader io.Reader = fh
+	if strings.HasSuffix(fn, ".gz") {
+		if reader, err = gzip.NewReader(reader); err != nil {
+			return err
+		}
+	}
+
+	stream := rlp.NewStream(reader, 0)
 
 	// Run actual the import.
 	blocks := make(types.Blocks, importBatchSize)
@@ -195,10 +205,18 @@ func ExportChain(blockchain *core.BlockChain, fn string) error {
 		return err
 	}
 	defer fh.Close()
-	if err := blockchain.Export(fh); err != nil {
+
+	var writer io.Writer = fh
+	if strings.HasSuffix(fn, ".gz") {
+		writer = gzip.NewWriter(writer)
+		defer writer.(*gzip.Writer).Close()
+	}
+
+	if err := blockchain.Export(writer); err != nil {
 		return err
 	}
 	glog.Infoln("Exported blockchain to ", fn)
+
 	return nil
 }
 
@@ -210,7 +228,14 @@ func ExportAppendChain(blockchain *core.BlockChain, fn string, first uint64, las
 		return err
 	}
 	defer fh.Close()
-	if err := blockchain.ExportN(fh, first, last); err != nil {
+
+	var writer io.Writer = fh
+	if strings.HasSuffix(fn, ".gz") {
+		writer = gzip.NewWriter(writer)
+		defer writer.(*gzip.Writer).Close()
+	}
+
+	if err := blockchain.ExportN(writer, first, last); err != nil {
 		return err
 	}
 	glog.Infoln("Exported blockchain to ", fn)
diff --git a/eth/api.go b/eth/api.go
index a86ed95cf..0a1d097e3 100644
--- a/eth/api.go
+++ b/eth/api.go
@@ -18,6 +18,7 @@ package eth
 
 import (
 	"bytes"
+	"compress/gzip"
 	"errors"
 	"fmt"
 	"io"
@@ -25,6 +26,7 @@ import (
 	"math/big"
 	"os"
 	"runtime"
+	"strings"
 	"time"
 
 	"github.com/ethereum/ethash"
@@ -217,8 +219,14 @@ func (api *PrivateAdminAPI) ExportChain(file string) (bool, error) {
 	}
 	defer out.Close()
 
+	var writer io.Writer = out
+	if strings.HasSuffix(file, ".gz") {
+		writer = gzip.NewWriter(writer)
+		defer writer.(*gzip.Writer).Close()
+	}
+
 	// Export the blockchain
-	if err := api.eth.BlockChain().Export(out); err != nil {
+	if err := api.eth.BlockChain().Export(writer); err != nil {
 		return false, err
 	}
 	return true, nil
@@ -243,8 +251,15 @@ func (api *PrivateAdminAPI) ImportChain(file string) (bool, error) {
 	}
 	defer in.Close()
 
+	var reader io.Reader = in
+	if strings.HasSuffix(file, ".gz") {
+		if reader, err = gzip.NewReader(reader); err != nil {
+			return false, err
+		}
+	}
+
 	// Run actual the import in pre-configured batches
-	stream := rlp.NewStream(in, 0)
+	stream := rlp.NewStream(reader, 0)
 
 	blocks, index := make([]*types.Block, 0, 2500), 0
 	for batch := 0; ; batch++ {
-- 
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