Implement snapshot restore

api/api.go

@@ -943,8 +943,15 @@ func decodeBody(resp *http.Response, out interface{}) error {
 	}
 }
 
-// encodeBody is used to encode a request body
+// encodeBody prepares the reader to serve as the request body.
+//
+// Returns the `obj` input if it is a raw io.Reader object; otherwise
+// returns a reader of the json format of the passed argument.
 func encodeBody(obj interface{}) (io.Reader, error) {
+	if reader, ok := obj.(io.Reader); ok {
+		return reader, nil
+	}
+
 	buf := bytes.NewBuffer(nil)
 	enc := json.NewEncoder(buf)
 	if err := enc.Encode(obj); err != nil {

api/operator.go

@@ -222,6 +222,17 @@ func (op *Operator) Snapshot(q *QueryOptions) (io.ReadCloser, error) {
 	return cr, nil
 }
 
+// SnapshotRestore is used to restore a running nomad cluster to an original
+// state.
+func (op *Operator) SnapshotRestore(in io.Reader, q *WriteOptions) (*WriteMeta, error) {
+	wm, err := op.c.write("/v1/operator/snapshot", in, nil, q)
+	if err != nil {
+		return nil, err
+	}
+
+	return wm, nil
+}
+
 type License struct {
 	// The unique identifier of the license
 	LicenseID string

command/agent/operator_endpoint.go

@@ -14,6 +14,7 @@ import (
 	"github.com/hashicorp/consul/agent/consul/autopilot"
 	"github.com/hashicorp/go-msgpack/codec"
 	"github.com/hashicorp/nomad/api"
+	cstructs "github.com/hashicorp/nomad/client/structs"
 	"github.com/hashicorp/nomad/nomad/structs"
 	"github.com/hashicorp/raft"
 )
@@ -292,6 +293,8 @@ func (s *HTTPServer) SnapshotRequest(resp http.ResponseWriter, req *http.Request
 	switch req.Method {
 	case "GET":
 		return s.snapshotSaveRequest(resp, req)
+	case "PUT", "POST":
+		return s.snapshotRestoreRequest(resp, req)
 	default:
 		return nil, CodedError(405, ErrInvalidMethod)
 	}
@@ -331,7 +334,7 @@ func (s *HTTPServer) snapshotSaveRequest(resp http.ResponseWriter, req *http.Req
 		httpPipe.Close()
 	}()
 
-	errCh := make(chan HTTPCodedError, 1)
+	errCh := make(chan HTTPCodedError, 2)
 	go func() {
 		defer cancel()
 
@@ -372,3 +375,91 @@ func (s *HTTPServer) snapshotSaveRequest(resp http.ResponseWriter, req *http.Req
 
 	return nil, codedErr
 }
+
+func (s *HTTPServer) snapshotRestoreRequest(resp http.ResponseWriter, req *http.Request) (interface{}, error) {
+	args := &structs.SnapshotRestoreRequest{}
+	s.parseWriteRequest(req, &args.WriteRequest)
+
+	var handler structs.StreamingRpcHandler
+	var handlerErr error
+
+	if server := s.agent.Server(); server != nil {
+		handler, handlerErr = server.StreamingRpcHandler("Operator.SnapshotRestore")
+	} else if client := s.agent.Client(); client != nil {
+		handler, handlerErr = client.RemoteStreamingRpcHandler("Operator.SnapshotRestore")
+	} else {
+		handlerErr = fmt.Errorf("misconfigured connection")
+	}
+
+	if handlerErr != nil {
+		return nil, CodedError(500, handlerErr.Error())
+	}
+
+	httpPipe, handlerPipe := net.Pipe()
+	decoder := codec.NewDecoder(httpPipe, structs.MsgpackHandle)
+	encoder := codec.NewEncoder(httpPipe, structs.MsgpackHandle)
+
+	// Create a goroutine that closes the pipe if the connection closes.
+	ctx, cancel := context.WithCancel(req.Context())
+	defer cancel()
+	go func() {
+		<-ctx.Done()
+		httpPipe.Close()
+	}()
+
+	errCh := make(chan HTTPCodedError, 2)
+	go func() {
+		defer cancel()
+
+		// Send the request
+		if err := encoder.Encode(args); err != nil {
+			errCh <- CodedError(500, err.Error())
+			return
+		}
+
+		go func() {
+			var wrapper cstructs.StreamErrWrapper
+			bytes := make([]byte, 1024)
+
+			for {
+				n, err := req.Body.Read(bytes)
+				if n > 0 {
+					wrapper.Payload = bytes[:n]
+					err := encoder.Encode(wrapper)
+					if err != nil {
+						errCh <- CodedError(500, err.Error())
+						return
+					}
+				}
+				if err != nil {
+					wrapper.Payload = nil
+					wrapper.Error = &cstructs.RpcError{Message: err.Error()}
+					err := encoder.Encode(wrapper)
+					if err != nil {
+						errCh <- CodedError(500, err.Error())
+					}
+					return
+				}
+			}
+		}()
+
+		var res structs.SnapshotRestoreResponse
+		if err := decoder.Decode(&res); err != nil {
+			errCh <- CodedError(500, err.Error())
+			return
+		}
+
+		if res.ErrorMsg != "" {
+			errCh <- CodedError(res.ErrorCode, res.ErrorMsg)
+			return
+		}
+
+		errCh <- nil
+	}()
+
+	handler(handlerPipe)
+	cancel()
+	codedErr := <-errCh
+
+	return nil, codedErr
+}

command/agent/operator_endpoint_test.go

@@ -11,12 +11,14 @@ import (
 	"net/http/httptest"
 	"os"
 	"path"
+	"path/filepath"
 	"strings"
 	"testing"
 	"time"
 
 	"github.com/hashicorp/consul/sdk/testutil/retry"
 	"github.com/hashicorp/nomad/api"
+	"github.com/hashicorp/nomad/nomad/mock"
 	"github.com/hashicorp/nomad/nomad/structs"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
@@ -389,25 +391,44 @@ func TestOperator_SchedulerCASConfiguration(t *testing.T) {
 	})
 }
 
-func TestOperator_SnapshotSaveRequest(t *testing.T) {
+func TestOperator_SnapshotRequests(t *testing.T) {
 	t.Parallel()
 
-	////// Nomad clusters topology - not specific to test
 	dir, err := ioutil.TempDir("", "nomadtest-operator-")
 	require.NoError(t, err)
 	defer os.RemoveAll(dir)
 
+	snapshotPath := filepath.Join(dir, "snapshot.bin")
+	job := mock.Job()
+
+	// test snapshot generation
 	httpTest(t, func(c *Config) {
 		c.Server.BootstrapExpect = 1
 		c.DevMode = false
 		c.DataDir = path.Join(dir, "server")
 		c.AdvertiseAddrs.HTTP = "127.0.0.1"
 		c.AdvertiseAddrs.RPC = "127.0.0.1"
 		c.AdvertiseAddrs.Serf = "127.0.0.1"
+
+		// don't actually run the job
+		c.Client.Enabled = false
 	}, func(s *TestAgent) {
+		// make a simple update
+		jargs := structs.JobRegisterRequest{
+			Job: job,
+			WriteRequest: structs.WriteRequest{
+				Region:    "global",
+				Namespace: structs.DefaultNamespace,
+			},
+		}
+		var jresp structs.JobRegisterResponse
+		err := s.Agent.RPC("Job.Register", &jargs, &jresp)
+		require.NoError(t, err)
+
+		// now actually snapshot
 		req, _ := http.NewRequest("GET", "/v1/operator/snapshot", nil)
 		resp := httptest.NewRecorder()
-		_, err := s.Server.SnapshotRequest(resp, req)
+		_, err = s.Server.SnapshotRequest(resp, req)
 		require.NoError(t, err)
 		require.Equal(t, 200, resp.Code)
 
@@ -416,11 +437,52 @@ func TestOperator_SnapshotSaveRequest(t *testing.T) {
 		require.Contains(t, digest, "sha-256=")
 
 		hash := sha256.New()
-		_, err = io.Copy(hash, resp.Body)
+		f, err := os.Create(snapshotPath)
+		require.NoError(t, err)
+		defer f.Close()
+
+		_, err = io.Copy(io.MultiWriter(f, hash), resp.Body)
 		require.NoError(t, err)
 
 		expectedChecksum := "sha-256=" + base64.StdEncoding.EncodeToString(hash.Sum(nil))
 		require.Equal(t, digest, expectedChecksum)
 	})
 
+	// test snapshot restoration
+	httpTest(t, func(c *Config) {
+		c.Server.BootstrapExpect = 1
+		c.DevMode = false
+		c.DataDir = path.Join(dir, "server2")
+		c.AdvertiseAddrs.HTTP = "127.0.0.1"
+		c.AdvertiseAddrs.RPC = "127.0.0.1"
+		c.AdvertiseAddrs.Serf = "127.0.0.1"
+
+		// don't actually run the job
+		c.Client.Enabled = false
+	}, func(s *TestAgent) {
+		jobExists := func() bool {
+			// check job isn't present
+			req, _ := http.NewRequest("GET", "/v1/job/"+job.ID, nil)
+			resp := httptest.NewRecorder()
+			j, _ := s.Server.jobCRUD(resp, req, job.ID)
+			return j != nil
+		}
+
+		// job doesn't get initially
+		require.False(t, jobExists())
+
+		// restrore and check if job exists after
+		f, err := os.Open(snapshotPath)
+		require.NoError(t, err)
+		defer f.Close()
+
+		req, _ := http.NewRequest("PUT", "/v1/operator/snapshot", f)
+		resp := httptest.NewRecorder()
+		_, err = s.Server.SnapshotRequest(resp, req)
+		require.NoError(t, err)
+		require.Equal(t, 200, resp.Code)
+
+		require.True(t, jobExists())
+	})
+
 }

command/agent/testagent.go

@@ -223,7 +223,8 @@ RETRY:
 
 func (a *TestAgent) start() (*Agent, error) {
 	if a.LogOutput == nil {
-		a.LogOutput = testlog.NewWriter(a.T)
+		prefix := fmt.Sprintf("%v:%v ", a.Config.BindAddr, a.Config.Ports.RPC)
+		a.LogOutput = testlog.NewPrefixWriter(a.T, prefix)
 	}
 
 	inm := metrics.NewInmemSink(10*time.Second, time.Minute)

command/commands.go

@@ -517,6 +517,11 @@ func Commands(metaPtr *Meta, agentUi cli.Ui) map[string]cli.CommandFactory {
 				Meta: meta,
 			}, nil
 		},
+		"operator snapshot restore": func() (cli.Command, error) {
+			return &OperatorSnapshotRestoreCommand{
+				Meta: meta,
+			}, nil
+		},
 
 		"plan": func() (cli.Command, error) {
 			return &JobPlanCommand{

command/operator_snapshot_inspect_test.go

@@ -6,6 +6,7 @@ import (
 	"path/filepath"
 	"testing"
 
+	"github.com/hashicorp/nomad/api"
 	"github.com/hashicorp/nomad/command/agent"
 	"github.com/mitchellh/cli"
 	"github.com/stretchr/testify/require"
@@ -14,7 +15,7 @@ import (
 func TestOperatorSnapshotInspect_Works(t *testing.T) {
 	t.Parallel()
 
-	snapPath := generateSnapshotFile(t)
+	snapPath := generateSnapshotFile(t, nil)
 
 	ui := new(cli.MockUi)
 	cmd := &OperatorSnapshotInspectCommand{Meta: Meta{Ui: ui}}
@@ -67,14 +68,14 @@ func TestOperatorSnapshotInspect_HandlesFailure(t *testing.T) {
 
 }
 
-func generateSnapshotFile(t *testing.T) string {
+func generateSnapshotFile(t *testing.T, prepare func(srv *agent.TestAgent, client *api.Client, url string)) string {
 
 	tmpDir, err := ioutil.TempDir("", "nomad-tempdir")
 	require.NoError(t, err)
 
 	t.Cleanup(func() { os.RemoveAll(tmpDir) })
 
-	srv, _, url := testServer(t, false, func(c *agent.Config) {
+	srv, api, url := testServer(t, false, func(c *agent.Config) {
 		c.DevMode = false
 		c.DataDir = filepath.Join(tmpDir, "server")
 
@@ -85,6 +86,10 @@ func generateSnapshotFile(t *testing.T) string {
 
 	defer srv.Shutdown()
 
+	if prepare != nil {
+		prepare(srv, api, url)
+	}
+
 	ui := new(cli.MockUi)
 	cmd := &OperatorSnapshotSaveCommand{Meta: Meta{Ui: ui}}