Support SesionTTLMin configuration

- Allow setting SessionTTLMin
- Validate on the Server

command/agent/agent.go

@@ -261,6 +261,9 @@ func (a *Agent) consulConfig() *consul.Config {
 	if a.config.ACLDownPolicy != "" {
 		base.ACLDownPolicy = a.config.ACLDownPolicy
 	}
+	if a.config.SessionTTLMinRaw != "" {
+		base.SessionTTLMin = a.config.SessionTTLMin
+	}
 
 	// Format the build string
 	revision := a.config.Revision

command/agent/config.go

@@ -363,6 +363,10 @@ type Config struct {
 
 	// UnixSockets is a map of socket configuration data
 	UnixSockets UnixSocketConfig `mapstructure:"unix_sockets"`
+
+	// Minimum Session TTL
+	SessionTTLMin    time.Duration `mapstructure:"-"`
+	SessionTTLMinRaw string        `mapstructure:"session_ttl_min"`
 }
 
 // UnixSocketPermissions contains information about a unix socket, and
@@ -609,6 +613,14 @@ func DecodeConfig(r io.Reader) (*Config, error) {
 		result.DNSRecursors = append(result.DNSRecursors, result.DNSRecursor)
 	}
 
+	if raw := result.SessionTTLMinRaw; raw != "" {
+		dur, err := time.ParseDuration(raw)
+		if err != nil {
+			return nil, fmt.Errorf("Session TTL Min invalid: %v", err)
+		}
+		result.SessionTTLMin = dur
+	}
+
 	return &result, nil
 }
 
@@ -970,7 +982,10 @@ func MergeConfig(a, b *Config) *Config {
 	if b.AtlasJoin {
 		result.AtlasJoin = true
 	}
-
+	if b.SessionTTLMinRaw != "" {
+		result.SessionTTLMin = b.SessionTTLMin
+		result.SessionTTLMinRaw = b.SessionTTLMinRaw
+	}
 	if len(b.HTTPAPIResponseHeaders) != 0 {
 		if result.HTTPAPIResponseHeaders == nil {
 			result.HTTPAPIResponseHeaders = make(map[string]string)

command/agent/config_test.go

@@ -653,6 +653,17 @@ func TestDecodeConfig(t *testing.T) {
 	if !config.AtlasJoin {
 		t.Fatalf("bad: %#v", config)
 	}
+
+	// SessionTTLMin
+	input = `{"session_ttl_min": "5s"}`
+	config, err = DecodeConfig(bytes.NewReader([]byte(input)))
+	if err != nil {
+		t.Fatalf("err: %s", err)
+	}
+
+	if config.SessionTTLMin != 5*time.Second {
+		t.Fatalf("bad: %s %#v", config.SessionTTLMin.String(), config)
+	}
 }
 
 func TestDecodeConfig_invalidKeys(t *testing.T) {
@@ -1120,6 +1131,8 @@ func TestMergeConfig(t *testing.T) {
 		AtlasToken:          "123456789",
 		AtlasACLToken:       "abcdefgh",
 		AtlasJoin:           true,
+		SessionTTLMinRaw:    "1000s",
+		SessionTTLMin:       1000 * time.Second,
 	}
 
 	c := MergeConfig(a, b)

command/agent/http_test.go

@@ -521,7 +521,11 @@ func getIndex(t *testing.T, resp *httptest.ResponseRecorder) uint64 {
 }
 
 func httpTest(t *testing.T, f func(srv *HTTPServer)) {
-	dir, srv := makeHTTPServer(t)
+	httpTestWithConfig(t, f, nil)
+}
+
+func httpTestWithConfig(t *testing.T, f func(srv *HTTPServer), cb func(c *Config)) {
+	dir, srv := makeHTTPServerWithConfig(t, cb)
 	defer os.RemoveAll(dir)
 	defer srv.Shutdown()
 	defer srv.agent.Shutdown()

command/agent/session_endpoint.go

@@ -53,21 +53,6 @@ func (s *HTTPServer) SessionCreate(resp http.ResponseWriter, req *http.Request)
 			resp.Write([]byte(fmt.Sprintf("Request decode failed: %v", err)))
 			return nil, nil
 		}
-
-		if args.Session.TTL != "" {
-			ttl, err := time.ParseDuration(args.Session.TTL)
-			if err != nil {
-				resp.WriteHeader(400)
-				resp.Write([]byte(fmt.Sprintf("Request TTL decode failed: %v", err)))
-				return nil, nil
-			}
-
-			if ttl != 0 && (ttl < structs.SessionTTLMin || ttl > structs.SessionTTLMax) {
-				resp.WriteHeader(400)
-				resp.Write([]byte(fmt.Sprintf("Request TTL '%s', must be between [%v-%v]", args.Session.TTL, structs.SessionTTLMin, structs.SessionTTLMax)))
-				return nil, nil
-			}
-		}
 	}
 
 	// Create the session, get the ID

command/agent/session_endpoint_test.go

@@ -3,12 +3,13 @@ package agent
 import (
 	"bytes"
 	"encoding/json"
-	"github.com/hashicorp/consul/consul"
-	"github.com/hashicorp/consul/consul/structs"
 	"net/http"
 	"net/http/httptest"
 	"testing"
 	"time"
+
+	"github.com/hashicorp/consul/consul"
+	"github.com/hashicorp/consul/consul/structs"
 )
 
 func TestSessionCreate(t *testing.T) {
@@ -215,9 +216,20 @@ func TestSessionDestroy(t *testing.T) {
 }
 
 func TestSessionTTL(t *testing.T) {
-	httpTest(t, func(srv *HTTPServer) {
+	// use the minimum legal ttl
-		TTL := "10s" // use the minimum legal ttl
+	testSessionTTL(t, 10*time.Second, nil)
-		ttl := 10 * time.Second
+}
+
+func TestSessionTTLConfig(t *testing.T) {
+	testSessionTTL(t, 1*time.Second, func(c *Config) {
+		c.SessionTTLMinRaw = "1s"
+		c.SessionTTLMin = 1 * time.Second
+	})
+}
+
+func testSessionTTL(t *testing.T, ttl time.Duration, cb func(c *Config)) {
+	httpTestWithConfig(t, func(srv *HTTPServer) {
+		TTL := ttl.String()
 
 		id := makeTestSessionTTL(t, srv, TTL)
 
@@ -252,85 +264,7 @@ func TestSessionTTL(t *testing.T) {
 		if len(respObj) != 0 {
 			t.Fatalf("session '%s' should have been destroyed", id)
 		}
-	})
+	}, cb)
-}
-
-func TestSessionBadTTL(t *testing.T) {
-	httpTest(t, func(srv *HTTPServer) {
-		badTTL := "10z"
-
-		// Create Session with illegal TTL
-		body := bytes.NewBuffer(nil)
-		enc := json.NewEncoder(body)
-		raw := map[string]interface{}{
-			"TTL": badTTL,
-		}
-		enc.Encode(raw)
-
-		req, err := http.NewRequest("PUT", "/v1/session/create", body)
-		if err != nil {
-			t.Fatalf("err: %v", err)
-		}
-		resp := httptest.NewRecorder()
-		obj, err := srv.SessionCreate(resp, req)
-		if err != nil {
-			t.Fatalf("err: %v", err)
-		}
-		if obj != nil {
-			t.Fatalf("illegal TTL '%s' allowed", badTTL)
-		}
-		if resp.Code != 400 {
-			t.Fatalf("Bad response code, should be 400")
-		}
-
-		// less than SessionTTLMin
-		body = bytes.NewBuffer(nil)
-		enc = json.NewEncoder(body)
-		raw = map[string]interface{}{
-			"TTL": "5s",
-		}
-		enc.Encode(raw)
-
-		req, err = http.NewRequest("PUT", "/v1/session/create", body)
-		if err != nil {
-			t.Fatalf("err: %v", err)
-		}
-		resp = httptest.NewRecorder()
-		obj, err = srv.SessionCreate(resp, req)
-		if err != nil {
-			t.Fatalf("err: %v", err)
-		}
-		if obj != nil {
-			t.Fatalf("illegal TTL '%s' allowed", badTTL)
-		}
-		if resp.Code != 400 {
-			t.Fatalf("Bad response code, should be 400")
-		}
-
-		// more than SessionTTLMax
-		body = bytes.NewBuffer(nil)
-		enc = json.NewEncoder(body)
-		raw = map[string]interface{}{
-			"TTL": "4000s",
-		}
-		enc.Encode(raw)
-
-		req, err = http.NewRequest("PUT", "/v1/session/create", body)
-		if err != nil {
-			t.Fatalf("err: %v", err)
-		}
-		resp = httptest.NewRecorder()
-		obj, err = srv.SessionCreate(resp, req)
-		if err != nil {
-			t.Fatalf("err: %v", err)
-		}
-		if obj != nil {
-			t.Fatalf("illegal TTL '%s' allowed", badTTL)
-		}
-		if resp.Code != 400 {
-			t.Fatalf("Bad response code, should be 400")
-		}
-	})
 }
 
 func TestSessionTTLRenew(t *testing.T) {

consul/config.go

@@ -181,6 +181,9 @@ type Config struct {
 	// to reduce overhead. It is unlikely a user would ever need to tune this.
 	TombstoneTTLGranularity time.Duration
 
+	// Minimum Session TTL
+	SessionTTLMin time.Duration
+
 	// ServerUp callback can be used to trigger a notification that
 	// a Consul server is now up and known about.
 	ServerUp func()
@@ -241,6 +244,7 @@ func DefaultConfig() *Config {
 		ACLDownPolicy:           "extend-cache",
 		TombstoneTTL:            15 * time.Minute,
 		TombstoneTTLGranularity: 30 * time.Second,
+		SessionTTLMin:           10 * time.Second,
 	}
 
 	// Increase our reap interval to 3 days instead of 24h.

consul/session_endpoint.go

@@ -47,9 +47,9 @@ func (s *Session) Apply(args *structs.SessionRequest, reply *string) error {
 			return fmt.Errorf("Session TTL '%s' invalid: %v", args.Session.TTL, err)
 		}
 
-		if ttl != 0 && (ttl < structs.SessionTTLMin || ttl > structs.SessionTTLMax) {
+		if ttl != 0 && (ttl < s.srv.config.SessionTTLMin || ttl > structs.SessionTTLMax) {
 			return fmt.Errorf("Invalid Session TTL '%d', must be between [%v=%v]",
-				ttl, structs.SessionTTLMin, structs.SessionTTLMax)
+				ttl, s.srv.config.SessionTTLMin, structs.SessionTTLMax)
 		}
 	}
 

consul/session_endpoint_test.go

@@ -483,3 +483,56 @@ func TestSessionEndpoint_NodeSessions(t *testing.T) {
 		}
 	}
 }
+
+func TestSessionEndpoint_Apply_BadTTL(t *testing.T) {
+	dir1, s1 := testServer(t)
+	defer os.RemoveAll(dir1)
+	defer s1.Shutdown()
+	client := rpcClient(t, s1)
+	defer client.Close()
+
+	testutil.WaitForLeader(t, client.Call, "dc1")
+
+	arg := structs.SessionRequest{
+		Datacenter: "dc1",
+		Op:         structs.SessionCreate,
+		Session: structs.Session{
+			Node: "foo",
+			Name: "my-session",
+		},
+	}
+
+	// Session with illegal TTL
+	arg.Session.TTL = "10z"
+
+	var out string
+	err := client.Call("Session.Apply", &arg, &out)
+	if err == nil {
+		t.Fatal("expected error")
+	}
+	if err.Error() != "Session TTL '10z' invalid: time: unknown unit z in duration 10z" {
+		t.Fatalf("incorrect error message: %s", err.Error())
+	}
+
+	// less than SessionTTLMin
+	arg.Session.TTL = "5s"
+
+	err = client.Call("Session.Apply", &arg, &out)
+	if err == nil {
+		t.Fatal("expected error")
+	}
+	if err.Error() != "Invalid Session TTL '5000000000', must be between [10s=1h0m0s]" {
+		t.Fatalf("incorrect error message: %s", err.Error())
+	}
+
+	// more than SessionTTLMax
+	arg.Session.TTL = "4000s"
+
+	err = client.Call("Session.Apply", &arg, &out)
+	if err == nil {
+		t.Fatal("expected error")
+	}
+	if err.Error() != "Invalid Session TTL '4000000000000', must be between [10s=1h0m0s]" {
+		t.Fatalf("incorrect error message: %s", err.Error())
+	}
+}

consul/state_store.go

@@ -1625,18 +1625,6 @@ func (s *StateStore) SessionCreate(index uint64, session *structs.Session) error
 		return fmt.Errorf("Invalid Session Behavior setting '%s'", session.Behavior)
 	}
 
-	if session.TTL != "" {
-		ttl, err := time.ParseDuration(session.TTL)
-		if err != nil {
-			return fmt.Errorf("Invalid Session TTL '%s': %v", session.TTL, err)
-		}
-
-		if ttl != 0 && (ttl < structs.SessionTTLMin || ttl > structs.SessionTTLMax) {
-			return fmt.Errorf("Invalid Session TTL '%s', must be between [%v-%v]",
-				session.TTL, structs.SessionTTLMin, structs.SessionTTLMax)
-		}
-	}
-
 	// Assign the create index
 	session.CreateIndex = index
 

consul/structs/structs.go

@@ -391,7 +391,6 @@ const (
 )
 
 const (
-	SessionTTLMin        = 10 * time.Second
 	SessionTTLMax        = 3600 * time.Second
 	SessionTTLMultiplier = 2
 )