Refresh stream search when stream changes (#3006)

Most of the time, search results include links to other streams. When
the user is currently searching on a stream, clicking on one of those
links was not working properly: the stream didn't update and the search
was still refering to the old stream.

These changes tackle that problem, by updating the stream when it
changes, and reloading search results as well.

Fixes #2998

graylog2-web-interface/src/pages/SearchPage.jsx

@@ -55,11 +55,11 @@ const SearchPage = React.createClass({
     const currentLocation = this.props.location || {};
     const nextLocation = nextProps.location || {};
 
-    if ((currentLocation !== nextLocation) || (currentLocation.search !== nextLocation.search)) {
+    if (currentLocation.search !== nextLocation.search || this.props.searchInStream !== nextProps.searchInStream) {
       if (this.promise) {
         this.promise.cancel();
       }
-      this._refreshData();
+      this._refreshData(nextProps.searchInStream);
     }
   },
   componentWillUnmount() {
@@ -79,9 +79,10 @@ const SearchPage = React.createClass({
   _getEffectiveQuery() {
     return SearchStore.query.length > 0 ? SearchStore.query : '*';
   },
-  _refreshData() {
+  _refreshData(searchInStream) {
     const query = this._getEffectiveQuery();
-    const streamId = this.props.searchInStream ? this.props.searchInStream.id : undefined;
+    const stream = searchInStream || this.props.searchInStream || {};
+    const streamId = stream.id;
     if (this.promise && !this.promise.isCancelled()) {
       return this.promise;
     }

graylog2-web-interface/src/pages/StreamSearchPage.jsx

@@ -15,7 +15,15 @@ const StreamSearchPage = React.createClass({
     };
   },
   componentDidMount() {
-    StreamsStore.get(this.props.params.streamId, (stream) => this.setState({stream: stream}));
+    this._fetchStream(this.props.params.streamId);
+  },
+  componentWillReceiveProps(nextProps) {
+    if (this.props.params.streamId !== nextProps.params.streamId) {
+      this._fetchStream(nextProps.params.streamId);
+    }
+  },
+  _fetchStream(streamId) {
+    StreamsStore.get(streamId, (stream) => this.setState({stream: stream}));
   },
   render() {
     if (!this.state.stream) {