Load error (#936)

* Add load-error callbacks, dispatchEvent function

* rename symbols to "error"

* Update plugin errors

Author: gkjohnson

src/base/TilesRendererBase.js

@@ -368,6 +368,12 @@ export class TilesRendererBase {
 	}
 
 	// Overrideable
+	dispatchEvent( e ) {
+
+		// event to be overriden for dispatching via an event system
+
+	}
+
 	fetchData( url, options ) {
 
 		return fetch( url, options );
@@ -590,11 +596,18 @@ export class TilesRendererBase {
 
 			} );
 
-		pr.catch( err => {
+		pr.catch( error => {
 
-			console.error( err );
+			console.error( error );
 			this.rootTileSet = null;
 
+			this.dispatchEvent( {
+				type: 'load-error',
+				tile: null,
+				error,
+				uri: processedUrl,
+			} );
+
 		} );
 
 		return pr;
@@ -785,7 +798,7 @@ export class TilesRendererBase {
 				}
 
 			} )
-			.catch( e => {
+			.catch( error => {
 
 				// if it has been unloaded then the tile has been disposed
 				if ( signal.aborted ) {
@@ -794,7 +807,7 @@ export class TilesRendererBase {
 
 				}
 
-				if ( e.name !== 'AbortError' ) {
+				if ( error.name !== 'AbortError' ) {
 
 					parseQueue.remove( tile );
 					downloadQueue.remove( tile );
@@ -812,10 +825,17 @@ export class TilesRendererBase {
 					stats.failed ++;
 
 					console.error( `TilesRenderer : Failed to load tile at url "${ tile.content.uri }".` );
-					console.error( e );
+					console.error( error );
 					tile.__loadingState = FAILED;
 					lruCache.setLoaded( tile, true );
 
+					this.dispatchEvent( {
+						type: 'load-error',
+						tile,
+						error,
+						uri,
+					} );
+
 				} else {
 
 					lruCache.remove( tile );

src/plugins/three/CesiumIonAuthPlugin.js

@@ -166,6 +166,19 @@ export class CesiumIonAuthPlugin {
 
 				} );
 
+			// dispatch an error if we fail to refresh the token
+			this._tokenRefreshPromise
+				.catch( error => {
+
+					this.tiles.dispatchEvent( {
+						type: 'load-error',
+						tile: null,
+						error,
+						url,
+					} );
+
+				} );
+
 		}
 
 		return this._tokenRefreshPromise;

src/plugins/three/GoogleCloudAuthPlugin.js

@@ -191,6 +191,20 @@ export class GoogleCloudAuthPlugin {
 
 				} );
 
+			// dispatch an error if we fail to refresh the token
+			this._tokenRefreshPromise
+				.catch( error => {
+
+					this.tiles.dispatchEvent( {
+						type: 'load-error',
+						tile: null,
+						error,
+						rootURL,
+					} );
+
+				} );
+
+
 		}
 
 		return this._tokenRefreshPromise;