Revendor serf to pull in keyring list truncation changes. (#5251)

vendor/github.com/hashicorp/serf/serf/event.go

@@ -123,8 +123,30 @@ func (q *Query) Deadline() time.Time {
 	return q.deadline
 }
 
-// Respond is used to send a response to the user query
-func (q *Query) Respond(buf []byte) error {
+func (q *Query) createResponse(buf []byte) messageQueryResponse {
+	// Create response
+	return messageQueryResponse{
+		LTime:   q.LTime,
+		ID:      q.id,
+		From:    q.serf.config.NodeName,
+		Payload: buf,
+	}
+}
+
+// Check response size
+func (q *Query) checkResponseSize(resp []byte) error {
+	if len(resp) > q.serf.config.QueryResponseSizeLimit {
+		return fmt.Errorf("response exceeds limit of %d bytes", q.serf.config.QueryResponseSizeLimit)
+	}
+	return nil
+}
+
+func (q *Query) respondWithMessageAndResponse(raw []byte, resp messageQueryResponse) error {
+	// Check the size limit
+	if err := q.checkResponseSize(raw); err != nil {
+		return err
+	}
+
 	q.respLock.Lock()
 	defer q.respLock.Unlock()
 
@@ -138,25 +160,6 @@ func (q *Query) Respond(buf []byte) error {
 		return fmt.Errorf("response is past the deadline")
 	}
 
-	// Create response
-	resp := messageQueryResponse{
-		LTime:   q.LTime,
-		ID:      q.id,
-		From:    q.serf.config.NodeName,
-		Payload: buf,
-	}
-
-	// Send a direct response
-	raw, err := encodeMessage(messageQueryResponseType, &resp)
-	if err != nil {
-		return fmt.Errorf("failed to format response: %v", err)
-	}
-
-	// Check the size limit
-	if len(raw) > q.serf.config.QueryResponseSizeLimit {
-		return fmt.Errorf("response exceeds limit of %d bytes", q.serf.config.QueryResponseSizeLimit)
-	}
-
 	// Send the response directly to the originator
 	addr := net.UDPAddr{IP: q.addr, Port: int(q.port)}
 	if err := q.serf.memberlist.SendTo(&addr, raw); err != nil {
@@ -170,5 +173,24 @@ func (q *Query) Respond(buf []byte) error {
 
 	// Clear the deadline, responses sent
 	q.deadline = time.Time{}
+
+	return nil
+}
+
+// Respond is used to send a response to the user query
+func (q *Query) Respond(buf []byte) error {
+	// Create response
+	resp := q.createResponse(buf)
+
+	// Encode response
+	raw, err := encodeMessage(messageQueryResponseType, resp)
+	if err != nil {
+		return fmt.Errorf("failed to format response: %v", err)
+	}
+
+	if err := q.respondWithMessageAndResponse(raw, resp); err != nil {
+		return fmt.Errorf("failed to respond to key query: %v", err)
+	}
+
 	return nil
 }

vendor/github.com/hashicorp/serf/serf/internal_query.go

@@ -2,6 +2,7 @@ package serf
 
 import (
 	"encoding/base64"
+	"fmt"
 	"log"
 	"strings"
 )
@@ -28,6 +29,13 @@ const (
 
 	// listKeysQuery is used to list all known keys in the cluster
 	listKeysQuery = "list-keys"
+
+	// minEncodedKeyLength is used to compute the max number of keys in a list key
+	// response. eg 1024/25 = 40. a message with max size of 1024 bytes cannot
+	// contain more than 40 keys. There is a test
+	// (TestSerfQueries_estimateMaxKeysInListKeyResponse) which does the
+	// computation and in case of changes, the value can be adjusted.
+	minEncodedKeyLength = 25
 )
 
 // internalQueryName is used to generate a query name for an internal query
@@ -149,17 +157,62 @@ func (s *serfQueries) handleConflict(q *Query) {
 	}
 }
 
+func (s *serfQueries) keyListResponseWithCorrectSize(q *Query, resp *nodeKeyResponse) ([]byte, messageQueryResponse, error) {
+	maxListKeys := q.serf.config.QueryResponseSizeLimit / minEncodedKeyLength
+	actual := len(resp.Keys)
+	for i := maxListKeys; i >= 0; i-- {
+		buf, err := encodeMessage(messageKeyResponseType, resp)
+		if err != nil {
+			return nil, messageQueryResponse{}, err
+		}
+
+		// Create response
+		qresp := q.createResponse(buf)
+
+		// Encode response
+		raw, err := encodeMessage(messageQueryResponseType, qresp)
+		if err != nil {
+			return nil, messageQueryResponse{}, err
+		}
+
+		// Check the size limit
+		if err = q.checkResponseSize(raw); err != nil {
+			resp.Keys = resp.Keys[0:i]
+			resp.Message = fmt.Sprintf("truncated key list response, showing first %d of %d keys", i, actual)
+			continue
+		}
+
+		if actual > i {
+			s.logger.Printf("[WARN] serf: %s", resp.Message)
+		}
+		return raw, qresp, nil
+	}
+	return nil, messageQueryResponse{}, fmt.Errorf("Failed to truncate response so that it fits into message")
+}
+
 // sendKeyResponse handles responding to key-related queries.
 func (s *serfQueries) sendKeyResponse(q *Query, resp *nodeKeyResponse) {
-	buf, err := encodeMessage(messageKeyResponseType, resp)
-	if err != nil {
-		s.logger.Printf("[ERR] serf: Failed to encode key response: %v", err)
-		return
-	}
-
-	if err := q.Respond(buf); err != nil {
-		s.logger.Printf("[ERR] serf: Failed to respond to key query: %v", err)
-		return
+	switch q.Name {
+	case internalQueryName(listKeysQuery):
+		raw, qresp, err := s.keyListResponseWithCorrectSize(q, resp)
+		if err != nil {
+			s.logger.Printf("[ERR] serf: %v", err)
+			return
+		}
+		if err := q.respondWithMessageAndResponse(raw, qresp); err != nil {
+			s.logger.Printf("[ERR] serf: Failed to respond to key query: %v", err)
+			return
+		}
+	default:
+		buf, err := encodeMessage(messageKeyResponseType, resp)
+		if err != nil {
+			s.logger.Printf("[ERR] serf: Failed to encode key response: %v", err)
+			return
+		}
+		if err := q.Respond(buf); err != nil {
+			s.logger.Printf("[ERR] serf: Failed to respond to key query: %v", err)
+			return
+		}
 	}
 }
 

vendor/github.com/hashicorp/serf/serf/keymanager.go

@@ -68,6 +68,11 @@ func (k *KeyManager) streamKeyResp(resp *KeyResponse, ch <-chan NodeResponse) {
 			resp.NumErr++
 		}
 
+		if nodeResponse.Result && len(nodeResponse.Message) > 0 {
+			resp.Messages[r.From] = nodeResponse.Message
+			k.serf.logger.Println("[WARN] serf:", nodeResponse.Message)
+		}
+
 		// Currently only used for key list queries, this adds keys to a counter
 		// and increments them for each node response which contains them.
 		for _, key := range nodeResponse.Keys {

vendor/vendor.json

@@ -150,8 +150,8 @@
 		{"path":"github.com/hashicorp/net-rpc-msgpackrpc","checksumSHA1":"qnlqWJYV81ENr61SZk9c65R1mDo=","revision":"a14192a58a694c123d8fe5481d4a4727d6ae82f3","revisionTime":"2015-11-16T02:03:38Z"},
 		{"path":"github.com/hashicorp/raft","checksumSHA1":"3U9bQLEMikE47n4TZP6uOdgXIyQ=","revision":"da92cfe76e0c1c9b94bbc9d884ec4b2b3b90b699","revisionTime":"2018-08-17T18:12:11Z","version":"master","versionExact":"master"},
 		{"path":"github.com/hashicorp/raft-boltdb","checksumSHA1":"QAxukkv54/iIvLfsUP6IK4R0m/A=","revision":"d1e82c1ec3f15ee991f7cc7ffd5b67ff6f5bbaee","revisionTime":"2015-02-01T20:08:39Z"},
-		{"path":"github.com/hashicorp/serf/coordinate","checksumSHA1":"0PeWsO2aI+2PgVYlYlDPKfzCLEQ=","revision":"c7f3bc96b40972e67dfbe007c1fa825cf59ac8c2","revisionTime":"2019-01-04T15:39:47Z"},
-		{"path":"github.com/hashicorp/serf/serf","checksumSHA1":"siLn7zwVHQk070rpd99BTktGfTs=","revision":"c7f3bc96b40972e67dfbe007c1fa825cf59ac8c2","revisionTime":"2019-01-04T15:39:47Z"},
+		{"path":"github.com/hashicorp/serf/coordinate","checksumSHA1":"0PeWsO2aI+2PgVYlYlDPKfzCLEQ=","revision":"65da6f27f6e551e03d99364ecc0607e91e526b00","revisionTime":"2019-01-22T20:12:06Z"},
+		{"path":"github.com/hashicorp/serf/serf","checksumSHA1":"zXQ+WC7vYZLkqqM38dtDQ2Erv0E=","revision":"65da6f27f6e551e03d99364ecc0607e91e526b00","revisionTime":"2019-01-22T20:12:06Z"},
 		{"path":"github.com/hashicorp/vault/api","checksumSHA1":"LYQZ+o7zJCda/6LibdN0spFco34=","revision":"533003e27840d9646cb4e7d23b3a113895da1dd0","revisionTime":"2018-06-20T14:55:40Z","version":"v0.10.3","versionExact":"v0.10.3"},
 		{"path":"github.com/hashicorp/vault/audit","checksumSHA1":"2JOC+Ur0S3U8Gqv2cfNB3zxgSBk=","revision":"c737968235c8673b872350f0a047877bee396342","revisionTime":"2018-06-20T16:45:32Z"},
 		{"path":"github.com/hashicorp/vault/builtin/logical/database/dbplugin","checksumSHA1":"RCwWixWwKG6j2vF9iVoxbCzo6p4=","revision":"c737968235c8673b872350f0a047877bee396342","revisionTime":"2018-06-20T16:45:32Z"},