Removing support for Go Modules

As explained in https://discuss.dgraph.io/t/go-modules-on-badger-and-dgraph/4662,
Go Modules force an import path rename that currently breaks support for most other
dependency management systems, including dep.

It seems an effort is being made to add support for this import path renaming by
patching the go tool itself, but until the community hasn't settled and Go Modules
is an easier option to adopt, we are simply not supporting them.

For those willing to use badger v2 from Go modules it is still very simple, you might
notice that once you set the version to be v2.0.0 a +incompatible will be added to it
indicating the dependency has not opted-in into Go Modules. That's normal and not to
be a concern.

README.md

@@ -55,7 +55,7 @@ few months. The [Changelog] is kept fairly up-to-date.
 To start using Badger, install Go 1.11 or above and run `go get`:
 
 ```sh
-$ go get github.com/dgraph-io/badger/v2/...
+$ go get github.com/dgraph-io/badger/...
 ```
 
 This will retrieve the library and install the `badger` command line
@@ -76,7 +76,7 @@ package main
 import (
 	"log"
 
-	badger "github.com/dgraph-io/badger/v2"
+	badger "github.com/dgraph-io/badger"
 )
 
 func main() {

appveyor.yml

@@ -34,8 +34,8 @@ build_script:
 test_script:
   # Unit tests
   - ps: Add-AppveyorTest "Unit Tests" -Outcome Running
-  - go test -v github.com/dgraph-io/badger/v2/...
-  - go test -v -vlog_mmap=false github.com/dgraph-io/badger/v2/...
+  - go test -v github.com/dgraph-io/badger/...
+  - go test -v -vlog_mmap=false github.com/dgraph-io/badger/...
   - ps: Update-AppveyorTest "Unit Tests" -Outcome Passed
 
 notifications:

backup.go

@@ -23,8 +23,8 @@ import (
 	"encoding/binary"
 	"io"
 
-	"github.com/dgraph-io/badger/v2/pb"
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger/pb"
+	"github.com/dgraph-io/badger/y"
 )
 
 // Backup is a wrapper function over Stream.Backup to generate full and incremental backups of the

backup_test.go

@@ -28,7 +28,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/dgraph-io/badger/v2/pb"
+	"github.com/dgraph-io/badger/pb"
 	"github.com/stretchr/testify/require"
 )
 

badger/cmd/backup.go

@@ -20,8 +20,8 @@ import (
 	"bufio"
 	"os"
 
-	"github.com/dgraph-io/badger/v2"
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger"
+	"github.com/dgraph-io/badger/y"
 	"github.com/spf13/cobra"
 )
 

badger/cmd/bank.go

@@ -30,10 +30,10 @@ import (
 	"sync/atomic"
 	"time"
 
-	"github.com/dgraph-io/badger/v2"
-	"github.com/dgraph-io/badger/v2/options"
-	"github.com/dgraph-io/badger/v2/pb"
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger"
+	"github.com/dgraph-io/badger/options"
+	"github.com/dgraph-io/badger/pb"
+	"github.com/dgraph-io/badger/y"
 	"github.com/spf13/cobra"
 )
 

badger/cmd/flatten.go

@@ -17,7 +17,7 @@
 package cmd
 
 import (
-	"github.com/dgraph-io/badger/v2"
+	"github.com/dgraph-io/badger"
 	"github.com/spf13/cobra"
 )
 

badger/cmd/info.go

@@ -29,10 +29,10 @@ import (
 
 	"github.com/pkg/errors"
 
-	"github.com/dgraph-io/badger/v2"
-	"github.com/dgraph-io/badger/v2/options"
-	"github.com/dgraph-io/badger/v2/table"
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger"
+	"github.com/dgraph-io/badger/options"
+	"github.com/dgraph-io/badger/table"
+	"github.com/dgraph-io/badger/y"
 	humanize "github.com/dustin/go-humanize"
 	"github.com/spf13/cobra"
 )

badger/cmd/read_bench.go

@@ -27,10 +27,10 @@ import (
 	humanize "github.com/dustin/go-humanize"
 	"github.com/spf13/cobra"
 
-	"github.com/dgraph-io/badger/v2"
-	"github.com/dgraph-io/badger/v2/options"
-	"github.com/dgraph-io/badger/v2/pb"
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger"
+	"github.com/dgraph-io/badger/options"
+	"github.com/dgraph-io/badger/pb"
+	"github.com/dgraph-io/badger/y"
 )
 
 var readBenchCmd = &cobra.Command{

badger/cmd/restore.go

@@ -21,7 +21,7 @@ import (
 	"os"
 	"path"
 
-	"github.com/dgraph-io/badger/v2"
+	"github.com/dgraph-io/badger"
 	"github.com/spf13/cobra"
 )
 

badger/cmd/write_bench.go

@@ -28,9 +28,9 @@ import (
 	humanize "github.com/dustin/go-humanize"
 	"github.com/spf13/cobra"
 
-	"github.com/dgraph-io/badger/v2"
-	"github.com/dgraph-io/badger/v2/pb"
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger"
+	"github.com/dgraph-io/badger/pb"
+	"github.com/dgraph-io/badger/y"
 )
 
 var writeBenchCmd = &cobra.Command{

badger/main.go

@@ -22,7 +22,7 @@ import (
 	_ "net/http/pprof"
 	"runtime"
 
-	"github.com/dgraph-io/badger/v2/badger/cmd"
+	"github.com/dgraph-io/badger/badger/cmd"
 )
 
 func main() {

batch.go

@@ -19,7 +19,7 @@ package badger
 import (
 	"sync"
 
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger/y"
 )
 
 // WriteBatch holds the necessary info to perform batched writes.

compaction.go

@@ -25,8 +25,8 @@ import (
 
 	"golang.org/x/net/trace"
 
-	"github.com/dgraph-io/badger/v2/table"
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger/table"
+	"github.com/dgraph-io/badger/y"
 )
 
 type keyRange struct {

db.go

@@ -32,11 +32,11 @@ import (
 	"sync/atomic"
 	"time"
 
-	"github.com/dgraph-io/badger/v2/options"
-	"github.com/dgraph-io/badger/v2/pb"
-	"github.com/dgraph-io/badger/v2/skl"
-	"github.com/dgraph-io/badger/v2/table"
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger/options"
+	"github.com/dgraph-io/badger/pb"
+	"github.com/dgraph-io/badger/skl"
+	"github.com/dgraph-io/badger/table"
+	"github.com/dgraph-io/badger/y"
 	humanize "github.com/dustin/go-humanize"
 	"github.com/pkg/errors"
 	"golang.org/x/net/trace"

db_test.go

@@ -35,11 +35,11 @@ import (
 	"testing"
 	"time"
 
-	"github.com/dgraph-io/badger/v2/options"
-	"github.com/dgraph-io/badger/v2/pb"
-	"github.com/dgraph-io/badger/v2/skl"
+	"github.com/dgraph-io/badger/options"
+	"github.com/dgraph-io/badger/pb"
+	"github.com/dgraph-io/badger/skl"
 
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger/y"
 	"github.com/stretchr/testify/require"
 )
 

integration/testgc/main.go

@@ -12,9 +12,9 @@ import (
 	"sync/atomic"
 	"time"
 
-	"github.com/dgraph-io/badger/v2"
-	"github.com/dgraph-io/badger/v2/options"
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger"
+	"github.com/dgraph-io/badger/options"
+	"github.com/dgraph-io/badger/y"
 )
 
 var maxValue int64 = 10000000

iterator.go

@@ -24,10 +24,10 @@ import (
 	"sync/atomic"
 	"time"
 
-	"github.com/dgraph-io/badger/v2/options"
-	"github.com/dgraph-io/badger/v2/table"
+	"github.com/dgraph-io/badger/options"
+	"github.com/dgraph-io/badger/table"
 
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger/y"
 )
 
 type prefetchStatus uint8

iterator_test.go

@@ -26,8 +26,8 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/dgraph-io/badger/v2/options"
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger/options"
+	"github.com/dgraph-io/badger/y"
 	"github.com/stretchr/testify/require"
 )
 
@@ -162,7 +162,7 @@ func TestIteratePrefix(t *testing.T) {
 // Benchmark with NO opt.Prefix set ===
 // goos: linux
 // goarch: amd64
-// pkg: github.com/dgraph-io/badger/v2
+// pkg: github.com/dgraph-io/badger
 // BenchmarkIteratePrefixSingleKey/Key_lookups-4         	   10000	    460924 ns/op
 // --- BENCH: BenchmarkIteratePrefixSingleKey/Key_lookups-4
 // 	iterator_test.go:147: Inner b.N: 1

level_handler.go

@@ -21,8 +21,8 @@ import (
 	"sort"
 	"sync"
 
-	"github.com/dgraph-io/badger/v2/table"
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger/table"
+	"github.com/dgraph-io/badger/y"
 	"github.com/pkg/errors"
 )
 

levels.go

@@ -30,9 +30,9 @@ import (
 
 	"golang.org/x/net/trace"
 
-	"github.com/dgraph-io/badger/v2/pb"
-	"github.com/dgraph-io/badger/v2/table"
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger/pb"
+	"github.com/dgraph-io/badger/table"
+	"github.com/dgraph-io/badger/y"
 	"github.com/pkg/errors"
 )
 

managed_db_test.go

@@ -12,7 +12,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger/y"
 	"github.com/stretchr/testify/require"
 )
 

manifest.go

@@ -27,8 +27,8 @@ import (
 	"path/filepath"
 	"sync"
 
-	"github.com/dgraph-io/badger/v2/pb"
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger/pb"
+	"github.com/dgraph-io/badger/y"
 	"github.com/pkg/errors"
 )
 

manifest_test.go

@@ -27,10 +27,10 @@ import (
 
 	"golang.org/x/net/trace"
 
-	"github.com/dgraph-io/badger/v2/options"
-	"github.com/dgraph-io/badger/v2/pb"
-	"github.com/dgraph-io/badger/v2/table"
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger/options"
+	"github.com/dgraph-io/badger/pb"
+	"github.com/dgraph-io/badger/table"
+	"github.com/dgraph-io/badger/y"
 	"github.com/stretchr/testify/require"
 )
 

merge.go

@@ -20,7 +20,7 @@ import (
 	"sync"
 	"time"
 
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger/y"
 	"github.com/pkg/errors"
 )
 

options.go

@@ -17,7 +17,7 @@
 package badger
 
 import (
-	"github.com/dgraph-io/badger/v2/options"
+	"github.com/dgraph-io/badger/options"
 )
 
 // Note: If you add a new option X make sure you also add a WithX method on Options.

publisher.go

@@ -20,8 +20,8 @@ import (
 	"bytes"
 	"sync"
 
-	"github.com/dgraph-io/badger/v2/pb"
-	"github.com/dgraph-io/badger/v2/y"
+	"github.com/dgraph-io/badger/pb"
+	"github.com/dgraph-io/badger/y"
 )
 
 type subscriber struct {

publisher_test.go

@@ -23,7 +23,7 @@ import (
 
 	"github.com/stretchr/testify/require"
 
-	"github.com/dgraph-io/badger/v2/pb"
+	"github.com/dgraph-io/badger/pb"
 )
 
 func TestPublisherOrdering(t *testing.T) {

skl/README.md

@@ -110,4 +110,4 @@ Showing top 10 nodes out of 41 (cum >= 185.62MB)
          0  signals received
      46434  voluntary context switches
     597049  involuntary context switches
-```
+```