diff --git a/src/github.com/matrix-org/dendrite/roomserver/api/input.go b/src/github.com/matrix-org/dendrite/roomserver/api/input.go
index fd177b19d..ad32286ab 100644
--- a/src/github.com/matrix-org/dendrite/roomserver/api/input.go
+++ b/src/github.com/matrix-org/dendrite/roomserver/api/input.go
@@ -1,6 +1,10 @@
 // Package api provides the types that are used to communicate with the roomserver.
 package api
 
+import (
+	"encoding/json"
+)
+
 const (
 	// KindOutlier event fall outside the contiguous event graph.
 	// We do not have the state for these events.
@@ -36,7 +40,61 @@ type InputRoomEvent struct {
 	// For example many matrix events forget to reference the m.room.create event even though it is needed for auth.
 	// (since synapse allows this to happen we have to allow it as well.)
 	AuthEventIDs []string
+	// Whether the state is supplied as a list of event IDs or whether it
+	// should be derived from the state at the previous events.
+	HasState bool
 	// Optional list of state event IDs forming the state before this event.
 	// These state events must have already been persisted.
+	// These are only used if HasState is true.
+	// The list can be empty, for example when storing the first event in a room.
 	StateEventIDs []string
 }
+
+// UnmarshalJSON implements json.Unmarshaller
+func (ire *InputRoomEvent) UnmarshalJSON(data []byte) error {
+	// Create a struct rather than unmarshalling directly into the InputRoomEvent
+	// so that we can use json.RawMessage.
+	// We use json.RawMessage so that the event JSON is sent as JSON rather than
+	// being base64 encoded which is the default for []byte.
+	var content struct {
+		Kind          int
+		Event         *json.RawMessage
+		AuthEventIDs  []string
+		StateEventIDs []string
+		HasState      bool
+	}
+	if err := json.Unmarshal(data, &content); err != nil {
+		return err
+	}
+	ire.Kind = content.Kind
+	ire.AuthEventIDs = content.AuthEventIDs
+	ire.StateEventIDs = content.StateEventIDs
+	ire.HasState = content.HasState
+	if content.Event != nil {
+		ire.Event = []byte(*content.Event)
+	}
+	return nil
+}
+
+// MarshalJSON implements json.Marshaller
+func (ire InputRoomEvent) MarshalJSON() ([]byte, error) {
+	// Create a struct rather than marshalling directly from the InputRoomEvent
+	// so that we can use json.RawMessage.
+	// We use json.RawMessage so that the event JSON is sent as JSON rather than
+	// being base64 encoded which is the default for []byte.
+	event := json.RawMessage(ire.Event)
+	content := struct {
+		Kind          int
+		Event         *json.RawMessage
+		AuthEventIDs  []string
+		StateEventIDs []string
+		HasState      bool
+	}{
+		Kind:          ire.Kind,
+		AuthEventIDs:  ire.AuthEventIDs,
+		StateEventIDs: ire.StateEventIDs,
+		Event:         &event,
+		HasState:      ire.HasState,
+	}
+	return json.Marshal(&content)
+}
diff --git a/src/github.com/matrix-org/dendrite/roomserver/input/events.go b/src/github.com/matrix-org/dendrite/roomserver/input/events.go
index e146d5734..91999916e 100644
--- a/src/github.com/matrix-org/dendrite/roomserver/input/events.go
+++ b/src/github.com/matrix-org/dendrite/roomserver/input/events.go
@@ -69,7 +69,7 @@ func processRoomEvent(db RoomEventDatabase, input api.InputRoomEvent) error {
 	if stateAtEvent.BeforeStateSnapshotNID == 0 {
 		// We haven't calculated a state for this event yet.
 		// Lets calculate one.
-		if input.StateEventIDs != nil {
+		if input.HasState {
 			// We've been told what the state at the event is so we don't need to calculate it.
 			// Check that those state events are in the database and store the state.
 			entries, err := db.StateEntriesForEventIDs(input.StateEventIDs)
@@ -89,6 +89,11 @@ func processRoomEvent(db RoomEventDatabase, input api.InputRoomEvent) error {
 		db.SetState(stateAtEvent.EventNID, stateAtEvent.BeforeStateSnapshotNID)
 	}
 
+	if input.Kind == api.KindBackfill {
+		// Backfill is not implemented.
+		panic("Not implemented")
+	}
+
 	// Update the extremities of the event graph for the room
 	if err := updateLatestEvents(db, roomNID, stateAtEvent, event); err != nil {
 		return err
@@ -102,5 +107,5 @@ func processRoomEvent(db RoomEventDatabase, input api.InputRoomEvent) error {
 	//      - The event itself
 	//      - The visiblity of the event, i.e. who is allowed to see the event.
 	//      - The changes to the current state of the room.
-	panic("Not implemented")
+	return nil
 }
diff --git a/src/github.com/matrix-org/dendrite/roomserver/input/latest_events.go b/src/github.com/matrix-org/dendrite/roomserver/input/latest_events.go
index c37c17001..0bd18ff75 100644
--- a/src/github.com/matrix-org/dendrite/roomserver/input/latest_events.go
+++ b/src/github.com/matrix-org/dendrite/roomserver/input/latest_events.go
@@ -58,15 +58,23 @@ func doUpdateLatestEvents(
 	}
 
 	// Check if this event references any of the latest events in the room.
+	var alreadyInLatest bool
 	var newLatest []types.StateAtEventAndReference
 	for _, l := range oldLatest {
+		keep := true
 		for _, prevEvent := range prevEvents {
 			if l.EventID == prevEvent.EventID && bytes.Compare(l.EventSHA256, prevEvent.EventSHA256) == 0 {
 				// This event can be removed from the latest events cause we've found an event that references it.
 				// (If an event is referenced by another event then it can't be one of the latest events in the room
 				//  because we have an event that comes after it)
-				continue
+				keep = false
+				break
 			}
+		}
+		if l.EventNID == stateAtEvent.EventNID {
+			alreadyInLatest = true
+		}
+		if keep {
 			// Keep the event in the latest events.
 			newLatest = append(newLatest, l)
 		}
@@ -79,8 +87,9 @@ func doUpdateLatestEvents(
 		return err
 	}
 
-	if !alreadyReferenced {
-		// This event is not referenced by any of the events in the room.
+	if !alreadyReferenced && !alreadyInLatest {
+		// This event is not referenced by any of the events in the room
+		// and the event is not already in the latest events.
 		// Add it to the latest events
 		newLatest = append(newLatest, types.StateAtEventAndReference{
 			StateAtEvent:   stateAtEvent,
diff --git a/src/github.com/matrix-org/dendrite/roomserver/storage/event_state_keys_table.go b/src/github.com/matrix-org/dendrite/roomserver/storage/event_state_keys_table.go
index ff4a76f29..88e1a5609 100644
--- a/src/github.com/matrix-org/dendrite/roomserver/storage/event_state_keys_table.go
+++ b/src/github.com/matrix-org/dendrite/roomserver/storage/event_state_keys_table.go
@@ -31,8 +31,7 @@ INSERT INTO event_state_keys (event_state_key_nid, event_state_key) VALUES
 const insertEventStateKeyNIDSQL = "" +
 	"INSERT INTO event_state_keys (event_state_key) VALUES ($1)" +
 	" ON CONFLICT ON CONSTRAINT event_state_key_unique" +
-	" DO UPDATE SET event_state_key = $1" +
-	" RETURNING (event_state_key_nid)"
+	" DO NOTHING RETURNING (event_state_key_nid)"
 
 const selectEventStateKeyNIDSQL = "" +
 	"SELECT event_state_key_nid FROM event_state_keys WHERE event_state_key = $1"
diff --git a/src/github.com/matrix-org/dendrite/roomserver/storage/event_types_table.go b/src/github.com/matrix-org/dendrite/roomserver/storage/event_types_table.go
index d8f132d6c..8437747d6 100644
--- a/src/github.com/matrix-org/dendrite/roomserver/storage/event_types_table.go
+++ b/src/github.com/matrix-org/dendrite/roomserver/storage/event_types_table.go
@@ -50,14 +50,18 @@ INSERT INTO event_types (event_type_nid, event_type) VALUES
 // In that case the ID will be assigned using the next value from the sequence.
 // We use `RETURNING` to tell postgres to return the assigned ID.
 // But it's possible that the type was added in a query that raced with us.
-// This will result in a conflict on the event_type_unique constraint.
-// We peform a update that does nothing rather that doing nothing at all because
-// postgres won't return anything unless we touch a row in the table.
+// This will result in a conflict on the event_type_unique constraint, in this
+// case we do nothing. Postgresql won't return a row in that case so we rely on
+// the caller catching the sql.ErrNoRows error and running a select to get the row.
+// We could get postgresql to return the row on a conflict by updating the row
+// but it doesn't seem like a good idea to modify the rows just to make postgresql
+// return it. Modifying the rows will cause postgres to assign a new tuple for the
+// row even though the data doesn't change resulting in unncesssary modifications
+// to the indexes.
 const insertEventTypeNIDSQL = "" +
 	"INSERT INTO event_types (event_type) VALUES ($1)" +
 	" ON CONFLICT ON CONSTRAINT event_type_unique" +
-	" DO UPDATE SET event_type = $1" +
-	" RETURNING (event_type_nid)"
+	" DO NOTHING RETURNING (event_type_nid)"
 
 const selectEventTypeNIDSQL = "" +
 	"SELECT event_type_nid FROM event_types WHERE event_type = $1"
diff --git a/src/github.com/matrix-org/dendrite/roomserver/storage/events_table.go b/src/github.com/matrix-org/dendrite/roomserver/storage/events_table.go
index 4a8957dd0..d89a1a0dd 100644
--- a/src/github.com/matrix-org/dendrite/roomserver/storage/events_table.go
+++ b/src/github.com/matrix-org/dendrite/roomserver/storage/events_table.go
@@ -47,9 +47,12 @@ const insertEventSQL = "" +
 	"INSERT INTO events (room_nid, event_type_nid, event_state_key_nid, event_id, reference_sha256, auth_event_nids)" +
 	" VALUES ($1, $2, $3, $4, $5, $6)" +
 	" ON CONFLICT ON CONSTRAINT event_id_unique" +
-	" DO UPDATE SET event_id = $1" +
+	" DO NOTHING" +
 	" RETURNING event_nid, state_snapshot_nid"
 
+const selectEventSQL = "" +
+	"SELECT event_nid, state_snapshot_nid FROM events WHERE event_id = $1"
+
 // Bulk lookup of events by string ID.
 // Sort by the numeric IDs for event type and state key.
 // This means we can use binary search to lookup entries by type and state key.
@@ -71,6 +74,7 @@ const bulkSelectStateAtEventAndReferenceSQL = "" +
 
 type eventStatements struct {
 	insertEventStmt                        *sql.Stmt
+	selectEventStmt                        *sql.Stmt
 	bulkSelectStateEventByIDStmt           *sql.Stmt
 	bulkSelectStateAtEventByIDStmt         *sql.Stmt
 	updateEventStateStmt                   *sql.Stmt
@@ -85,6 +89,9 @@ func (s *eventStatements) prepare(db *sql.DB) (err error) {
 	if s.insertEventStmt, err = db.Prepare(insertEventSQL); err != nil {
 		return
 	}
+	if s.selectEventStmt, err = db.Prepare(selectEventSQL); err != nil {
+		return
+	}
 	if s.bulkSelectStateEventByIDStmt, err = db.Prepare(bulkSelectStateEventByIDSQL); err != nil {
 		return
 	}
@@ -119,6 +126,13 @@ func (s *eventStatements) insertEvent(
 	return types.EventNID(eventNID), types.StateSnapshotNID(stateNID), err
 }
 
+func (s *eventStatements) selectEvent(eventID string) (types.EventNID, types.StateSnapshotNID, error) {
+	var eventNID int64
+	var stateNID int64
+	err := s.selectEventStmt.QueryRow(eventID).Scan(&eventNID, &stateNID)
+	return types.EventNID(eventNID), types.StateSnapshotNID(stateNID), err
+}
+
 func (s *eventStatements) bulkSelectStateEventByID(eventIDs []string) ([]types.StateEntry, error) {
 	rows, err := s.bulkSelectStateEventByIDStmt.Query(pq.StringArray(eventIDs))
 	if err != nil {
@@ -134,9 +148,9 @@ func (s *eventStatements) bulkSelectStateEventByID(eventIDs []string) ([]types.S
 	for ; rows.Next(); i++ {
 		result := &results[i]
 		if err = rows.Scan(
-			&result.EventNID,
 			&result.EventTypeNID,
 			&result.EventStateKeyNID,
+			&result.EventNID,
 		); err != nil {
 			return nil, err
 		}
@@ -163,9 +177,9 @@ func (s *eventStatements) bulkSelectStateAtEventByID(eventIDs []string) ([]types
 	for ; rows.Next(); i++ {
 		result := &results[i]
 		if err = rows.Scan(
-			&result.EventNID,
 			&result.EventTypeNID,
 			&result.EventStateKeyNID,
+			&result.EventNID,
 			&result.BeforeStateSnapshotNID,
 		); err != nil {
 			return nil, err
diff --git a/src/github.com/matrix-org/dendrite/roomserver/storage/rooms_table.go b/src/github.com/matrix-org/dendrite/roomserver/storage/rooms_table.go
index 07d668fac..78c1c883f 100644
--- a/src/github.com/matrix-org/dendrite/roomserver/storage/rooms_table.go
+++ b/src/github.com/matrix-org/dendrite/roomserver/storage/rooms_table.go
@@ -16,7 +16,7 @@ CREATE TABLE IF NOT EXISTS rooms (
     -- The most recent events in the room that aren't referenced by another event.
     -- This list may empty if the server hasn't joined the room yet.
     -- (The server will be in that state while it stores the events for the initial state of the room)
-    latest_event_nids BIGINT[] NOT NULL
+    latest_event_nids BIGINT[] NOT NULL DEFAULT '{}'::BIGINT[]
 );
 `
 
@@ -24,8 +24,7 @@ CREATE TABLE IF NOT EXISTS rooms (
 const insertRoomNIDSQL = "" +
 	"INSERT INTO rooms (room_id) VALUES ($1)" +
 	" ON CONFLICT ON CONSTRAINT room_id_unique" +
-	" DO UPDATE SET room_id = $1" +
-	" RETURNING (room_nid)"
+	" DO NOTHING RETURNING (room_nid)"
 
 const selectRoomNIDSQL = "" +
 	"SELECT room_nid FROM rooms WHERE room_id = $1"
diff --git a/src/github.com/matrix-org/dendrite/roomserver/storage/storage.go b/src/github.com/matrix-org/dendrite/roomserver/storage/storage.go
index a49d0d84f..11fc9f6c4 100644
--- a/src/github.com/matrix-org/dendrite/roomserver/storage/storage.go
+++ b/src/github.com/matrix-org/dendrite/roomserver/storage/storage.go
@@ -73,7 +73,13 @@ func (d *Database) StoreEvent(event gomatrixserverlib.Event, authEventNIDs []typ
 		event.EventReference().EventSHA256,
 		authEventNIDs,
 	); err != nil {
-		return 0, types.StateAtEvent{}, err
+		if err == sql.ErrNoRows {
+			// We've already inserted the event so select the numeric event ID
+			eventNID, stateNID, err = d.statements.selectEvent(event.EventID())
+		}
+		if err != nil {
+			return 0, types.StateAtEvent{}, err
+		}
 	}
 
 	if err = d.statements.insertEventJSON(eventNID, event.JSON()); err != nil {
@@ -97,12 +103,13 @@ func (d *Database) assignRoomNID(roomID string) (types.RoomNID, error) {
 	roomNID, err := d.statements.selectRoomNID(roomID)
 	if err == sql.ErrNoRows {
 		// We don't have a numeric ID so insert one into the database.
-		return d.statements.insertRoomNID(roomID)
+		roomNID, err = d.statements.insertRoomNID(roomID)
+		if err == sql.ErrNoRows {
+			// We raced with another insert so run the select again.
+			roomNID, err = d.statements.selectRoomNID(roomID)
+		}
 	}
-	if err != nil {
-		return 0, err
-	}
-	return roomNID, nil
+	return roomNID, err
 }
 
 func (d *Database) assignEventTypeNID(eventType string) (types.EventTypeNID, error) {
@@ -110,12 +117,13 @@ func (d *Database) assignEventTypeNID(eventType string) (types.EventTypeNID, err
 	eventTypeNID, err := d.statements.selectEventTypeNID(eventType)
 	if err == sql.ErrNoRows {
 		// We don't have a numeric ID so insert one into the database.
-		return d.statements.insertEventTypeNID(eventType)
+		eventTypeNID, err = d.statements.insertEventTypeNID(eventType)
+		if err == sql.ErrNoRows {
+			// We raced with another insert so run the select again.
+			eventTypeNID, err = d.statements.selectEventTypeNID(eventType)
+		}
 	}
-	if err != nil {
-		return 0, err
-	}
-	return eventTypeNID, nil
+	return eventTypeNID, err
 }
 
 func (d *Database) assignStateKeyNID(eventStateKey string) (types.EventStateKeyNID, error) {
@@ -123,12 +131,13 @@ func (d *Database) assignStateKeyNID(eventStateKey string) (types.EventStateKeyN
 	eventStateKeyNID, err := d.statements.selectEventStateKeyNID(eventStateKey)
 	if err == sql.ErrNoRows {
 		// We don't have a numeric ID so insert one into the database.
-		return d.statements.insertEventStateKeyNID(eventStateKey)
+		eventStateKeyNID, err = d.statements.insertEventStateKeyNID(eventStateKey)
+		if err == sql.ErrNoRows {
+			// We raced with another insert so run the select again.
+			eventStateKeyNID, err = d.statements.selectEventStateKeyNID(eventStateKey)
+		}
 	}
-	if err != nil {
-		return 0, err
-	}
-	return eventStateKeyNID, nil
+	return eventStateKeyNID, err
 }
 
 // StateEntriesForEventIDs implements input.EventDatabase
diff --git a/vendor/manifest b/vendor/manifest
index 8681132a7..99f433a94 100644
--- a/vendor/manifest
+++ b/vendor/manifest
@@ -59,6 +59,12 @@
 			"revision": "7db9049039a047d955fe8c19b83c8ff5abd765c7",
 			"branch": "master"
 		},
+		{
+			"importpath": "github.com/gorilla/context",
+			"repository": "https://github.com/gorilla/context",
+			"revision": "08b5f424b9271eedf6f9f0ce86cb9396ed337a42",
+			"branch": "master"
+		},
 		{
 			"importpath": "github.com/gorilla/mux",
 			"repository": "https://github.com/gorilla/mux",
@@ -200,4 +206,4 @@
 			"branch": "master"
 		}
 	]
-}
+}
\ No newline at end of file
diff --git a/vendor/src/github.com/gorilla/context/LICENSE b/vendor/src/github.com/gorilla/context/LICENSE
new file mode 100644
index 000000000..0e5fb8728
--- /dev/null
+++ b/vendor/src/github.com/gorilla/context/LICENSE
@@ -0,0 +1,27 @@
+Copyright (c) 2012 Rodrigo Moraes. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+	 * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+	 * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+	 * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/vendor/src/github.com/gorilla/context/README.md b/vendor/src/github.com/gorilla/context/README.md
new file mode 100644
index 000000000..08f86693b
--- /dev/null
+++ b/vendor/src/github.com/gorilla/context/README.md
@@ -0,0 +1,10 @@
+context
+=======
+[![Build Status](https://travis-ci.org/gorilla/context.png?branch=master)](https://travis-ci.org/gorilla/context)
+
+gorilla/context is a general purpose registry for global request variables.
+
+> Note: gorilla/context, having been born well before `context.Context` existed, does not play well
+> with the shallow copying of the request that [`http.Request.WithContext`](https://golang.org/pkg/net/http/#Request.WithContext) (added to net/http Go 1.7 onwards) performs. You should either use *just* gorilla/context, or moving forward, the new `http.Request.Context()`.
+
+Read the full documentation here: http://www.gorillatoolkit.org/pkg/context
diff --git a/vendor/src/github.com/gorilla/context/context.go b/vendor/src/github.com/gorilla/context/context.go
new file mode 100644
index 000000000..81cb128b1
--- /dev/null
+++ b/vendor/src/github.com/gorilla/context/context.go
@@ -0,0 +1,143 @@
+// Copyright 2012 The Gorilla Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package context
+
+import (
+	"net/http"
+	"sync"
+	"time"
+)
+
+var (
+	mutex sync.RWMutex
+	data  = make(map[*http.Request]map[interface{}]interface{})
+	datat = make(map[*http.Request]int64)
+)
+
+// Set stores a value for a given key in a given request.
+func Set(r *http.Request, key, val interface{}) {
+	mutex.Lock()
+	if data[r] == nil {
+		data[r] = make(map[interface{}]interface{})
+		datat[r] = time.Now().Unix()
+	}
+	data[r][key] = val
+	mutex.Unlock()
+}
+
+// Get returns a value stored for a given key in a given request.
+func Get(r *http.Request, key interface{}) interface{} {
+	mutex.RLock()
+	if ctx := data[r]; ctx != nil {
+		value := ctx[key]
+		mutex.RUnlock()
+		return value
+	}
+	mutex.RUnlock()
+	return nil
+}
+
+// GetOk returns stored value and presence state like multi-value return of map access.
+func GetOk(r *http.Request, key interface{}) (interface{}, bool) {
+	mutex.RLock()
+	if _, ok := data[r]; ok {
+		value, ok := data[r][key]
+		mutex.RUnlock()
+		return value, ok
+	}
+	mutex.RUnlock()
+	return nil, false
+}
+
+// GetAll returns all stored values for the request as a map. Nil is returned for invalid requests.
+func GetAll(r *http.Request) map[interface{}]interface{} {
+	mutex.RLock()
+	if context, ok := data[r]; ok {
+		result := make(map[interface{}]interface{}, len(context))
+		for k, v := range context {
+			result[k] = v
+		}
+		mutex.RUnlock()
+		return result
+	}
+	mutex.RUnlock()
+	return nil
+}
+
+// GetAllOk returns all stored values for the request as a map and a boolean value that indicates if
+// the request was registered.
+func GetAllOk(r *http.Request) (map[interface{}]interface{}, bool) {
+	mutex.RLock()
+	context, ok := data[r]
+	result := make(map[interface{}]interface{}, len(context))
+	for k, v := range context {
+		result[k] = v
+	}
+	mutex.RUnlock()
+	return result, ok
+}
+
+// Delete removes a value stored for a given key in a given request.
+func Delete(r *http.Request, key interface{}) {
+	mutex.Lock()
+	if data[r] != nil {
+		delete(data[r], key)
+	}
+	mutex.Unlock()
+}
+
+// Clear removes all values stored for a given request.
+//
+// This is usually called by a handler wrapper to clean up request
+// variables at the end of a request lifetime. See ClearHandler().
+func Clear(r *http.Request) {
+	mutex.Lock()
+	clear(r)
+	mutex.Unlock()
+}
+
+// clear is Clear without the lock.
+func clear(r *http.Request) {
+	delete(data, r)
+	delete(datat, r)
+}
+
+// Purge removes request data stored for longer than maxAge, in seconds.
+// It returns the amount of requests removed.
+//
+// If maxAge <= 0, all request data is removed.
+//
+// This is only used for sanity check: in case context cleaning was not
+// properly set some request data can be kept forever, consuming an increasing
+// amount of memory. In case this is detected, Purge() must be called
+// periodically until the problem is fixed.
+func Purge(maxAge int) int {
+	mutex.Lock()
+	count := 0
+	if maxAge <= 0 {
+		count = len(data)
+		data = make(map[*http.Request]map[interface{}]interface{})
+		datat = make(map[*http.Request]int64)
+	} else {
+		min := time.Now().Unix() - int64(maxAge)
+		for r := range data {
+			if datat[r] < min {
+				clear(r)
+				count++
+			}
+		}
+	}
+	mutex.Unlock()
+	return count
+}
+
+// ClearHandler wraps an http.Handler and clears request values at the end
+// of a request lifetime.
+func ClearHandler(h http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		defer Clear(r)
+		h.ServeHTTP(w, r)
+	})
+}
diff --git a/vendor/src/github.com/gorilla/context/context_test.go b/vendor/src/github.com/gorilla/context/context_test.go
new file mode 100644
index 000000000..d70e91a23
--- /dev/null
+++ b/vendor/src/github.com/gorilla/context/context_test.go
@@ -0,0 +1,161 @@
+// Copyright 2012 The Gorilla Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package context
+
+import (
+	"net/http"
+	"testing"
+)
+
+type keyType int
+
+const (
+	key1 keyType = iota
+	key2
+)
+
+func TestContext(t *testing.T) {
+	assertEqual := func(val interface{}, exp interface{}) {
+		if val != exp {
+			t.Errorf("Expected %v, got %v.", exp, val)
+		}
+	}
+
+	r, _ := http.NewRequest("GET", "http://localhost:8080/", nil)
+	emptyR, _ := http.NewRequest("GET", "http://localhost:8080/", nil)
+
+	// Get()
+	assertEqual(Get(r, key1), nil)
+
+	// Set()
+	Set(r, key1, "1")
+	assertEqual(Get(r, key1), "1")
+	assertEqual(len(data[r]), 1)
+
+	Set(r, key2, "2")
+	assertEqual(Get(r, key2), "2")
+	assertEqual(len(data[r]), 2)
+
+	//GetOk
+	value, ok := GetOk(r, key1)
+	assertEqual(value, "1")
+	assertEqual(ok, true)
+
+	value, ok = GetOk(r, "not exists")
+	assertEqual(value, nil)
+	assertEqual(ok, false)
+
+	Set(r, "nil value", nil)
+	value, ok = GetOk(r, "nil value")
+	assertEqual(value, nil)
+	assertEqual(ok, true)
+
+	// GetAll()
+	values := GetAll(r)
+	assertEqual(len(values), 3)
+
+	// GetAll() for empty request
+	values = GetAll(emptyR)
+	if values != nil {
+		t.Error("GetAll didn't return nil value for invalid request")
+	}
+
+	// GetAllOk()
+	values, ok = GetAllOk(r)
+	assertEqual(len(values), 3)
+	assertEqual(ok, true)
+
+	// GetAllOk() for empty request
+	values, ok = GetAllOk(emptyR)
+	assertEqual(len(values), 0)
+	assertEqual(ok, false)
+
+	// Delete()
+	Delete(r, key1)
+	assertEqual(Get(r, key1), nil)
+	assertEqual(len(data[r]), 2)
+
+	Delete(r, key2)
+	assertEqual(Get(r, key2), nil)
+	assertEqual(len(data[r]), 1)
+
+	// Clear()
+	Clear(r)
+	assertEqual(len(data), 0)
+}
+
+func parallelReader(r *http.Request, key string, iterations int, wait, done chan struct{}) {
+	<-wait
+	for i := 0; i < iterations; i++ {
+		Get(r, key)
+	}
+	done <- struct{}{}
+
+}
+
+func parallelWriter(r *http.Request, key, value string, iterations int, wait, done chan struct{}) {
+	<-wait
+	for i := 0; i < iterations; i++ {
+		Set(r, key, value)
+	}
+	done <- struct{}{}
+
+}
+
+func benchmarkMutex(b *testing.B, numReaders, numWriters, iterations int) {
+
+	b.StopTimer()
+	r, _ := http.NewRequest("GET", "http://localhost:8080/", nil)
+	done := make(chan struct{})
+	b.StartTimer()
+
+	for i := 0; i < b.N; i++ {
+		wait := make(chan struct{})
+
+		for i := 0; i < numReaders; i++ {
+			go parallelReader(r, "test", iterations, wait, done)
+		}
+
+		for i := 0; i < numWriters; i++ {
+			go parallelWriter(r, "test", "123", iterations, wait, done)
+		}
+
+		close(wait)
+
+		for i := 0; i < numReaders+numWriters; i++ {
+			<-done
+		}
+
+	}
+
+}
+
+func BenchmarkMutexSameReadWrite1(b *testing.B) {
+	benchmarkMutex(b, 1, 1, 32)
+}
+func BenchmarkMutexSameReadWrite2(b *testing.B) {
+	benchmarkMutex(b, 2, 2, 32)
+}
+func BenchmarkMutexSameReadWrite4(b *testing.B) {
+	benchmarkMutex(b, 4, 4, 32)
+}
+func BenchmarkMutex1(b *testing.B) {
+	benchmarkMutex(b, 2, 8, 32)
+}
+func BenchmarkMutex2(b *testing.B) {
+	benchmarkMutex(b, 16, 4, 64)
+}
+func BenchmarkMutex3(b *testing.B) {
+	benchmarkMutex(b, 1, 2, 128)
+}
+func BenchmarkMutex4(b *testing.B) {
+	benchmarkMutex(b, 128, 32, 256)
+}
+func BenchmarkMutex5(b *testing.B) {
+	benchmarkMutex(b, 1024, 2048, 64)
+}
+func BenchmarkMutex6(b *testing.B) {
+	benchmarkMutex(b, 2048, 1024, 512)
+}
diff --git a/vendor/src/github.com/gorilla/context/doc.go b/vendor/src/github.com/gorilla/context/doc.go
new file mode 100644
index 000000000..448d1bfca
--- /dev/null
+++ b/vendor/src/github.com/gorilla/context/doc.go
@@ -0,0 +1,88 @@
+// Copyright 2012 The Gorilla Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+Package context stores values shared during a request lifetime.
+
+Note: gorilla/context, having been born well before `context.Context` existed,
+does not play well > with the shallow copying of the request that
+[`http.Request.WithContext`](https://golang.org/pkg/net/http/#Request.WithContext)
+(added to net/http Go 1.7 onwards) performs. You should either use *just*
+gorilla/context, or moving forward, the new `http.Request.Context()`.
+
+For example, a router can set variables extracted from the URL and later
+application handlers can access those values, or it can be used to store
+sessions values to be saved at the end of a request. There are several
+others common uses.
+
+The idea was posted by Brad Fitzpatrick to the go-nuts mailing list:
+
+	http://groups.google.com/group/golang-nuts/msg/e2d679d303aa5d53
+
+Here's the basic usage: first define the keys that you will need. The key
+type is interface{} so a key can be of any type that supports equality.
+Here we define a key using a custom int type to avoid name collisions:
+
+	package foo
+
+	import (
+		"github.com/gorilla/context"
+	)
+
+	type key int
+
+	const MyKey key = 0
+
+Then set a variable. Variables are bound to an http.Request object, so you
+need a request instance to set a value:
+
+	context.Set(r, MyKey, "bar")
+
+The application can later access the variable using the same key you provided:
+
+	func MyHandler(w http.ResponseWriter, r *http.Request) {
+		// val is "bar".
+		val := context.Get(r, foo.MyKey)
+
+		// returns ("bar", true)
+		val, ok := context.GetOk(r, foo.MyKey)
+		// ...
+	}
+
+And that's all about the basic usage. We discuss some other ideas below.
+
+Any type can be stored in the context. To enforce a given type, make the key
+private and wrap Get() and Set() to accept and return values of a specific
+type:
+
+	type key int
+
+	const mykey key = 0
+
+	// GetMyKey returns a value for this package from the request values.
+	func GetMyKey(r *http.Request) SomeType {
+		if rv := context.Get(r, mykey); rv != nil {
+			return rv.(SomeType)
+		}
+		return nil
+	}
+
+	// SetMyKey sets a value for this package in the request values.
+	func SetMyKey(r *http.Request, val SomeType) {
+		context.Set(r, mykey, val)
+	}
+
+Variables must be cleared at the end of a request, to remove all values
+that were stored. This can be done in an http.Handler, after a request was
+served. Just call Clear() passing the request:
+
+	context.Clear(r)
+
+...or use ClearHandler(), which conveniently wraps an http.Handler to clear
+variables at the end of a request lifetime.
+
+The Routers from the packages gorilla/mux and gorilla/pat call Clear()
+so if you are using either of them you don't need to clear the context manually.
+*/
+package context