// Retrieve the image specified for this item in its metadata.
internal IEnumerator GetImage(Action <ImageInfo> listener)
{
// First retrieve basic metadata if we have not done so for this item.
if (this.metadata == null)
{
Debug.Log("Retrieving metadata first");
this.GetMetadata((metadataInfo) =>
{
if (metadataInfo.state == MetadataInfo.MetadataRequestState.SUCCESS)
{
this.metadata = metadataInfo.metadata;
GetImageHelper(listener);
}
// Trigger our callback with a notice about bad metadata.
else
{
ImageInfo response = new ImageInfo
{
state = ImageInfo.ImageRequestState.BAD_METADATA,
exception = new ImageRetrievalException()
};
listener(response);
}
});
}
else
{
// Prepare a response object.
ImageInfo response = new ImageInfo();
// Retrieve the item's image.
string imageURI = this.metadata.image;
UnityWebRequest imageRequest = UnityWebRequestTexture.GetTexture(imageURI);
yield return(imageRequest.SendWebRequest());
// If the request failed, log an error and throw an exception.
if (imageRequest.isNetworkError || imageRequest.isHttpError)
{
Debug.Log("<color=red>[ERROR]</color> Image network error: " + imageRequest.error);
response.state = ImageInfo.ImageRequestState.RETRIEVAL_FAILED;
response.exception = new ImageRetrievalException();
}
// Otherwise the request succeeded, so attempt to parse and return.
else
{
Texture2D texture = DownloadHandlerTexture.GetContent(imageRequest);
response.state = ImageInfo.ImageRequestState.SUCCESS;
response.image = Sprite.Create(texture, new Rect(0, 0, texture.width, texture.height), new Vector2(0, 0));
}
// Trigger our callback.
listener(response);
}
}
// Retrieve the basic metadata object required for all items.
internal IEnumerator GetMetadata(Action <MetadataInfo> listener)
{
// Prepare the response object for the callback.
MetadataInfo response = new MetadataInfo();
// Issue the web request to fetch the metadata JSON at the item URI.
UnityWebRequest metadataRequest = UnityWebRequest.Get(itemURI);
yield return(metadataRequest.SendWebRequest());
// If the request failed, log an error and throw an exception.
if (metadataRequest.isNetworkError)
{
Debug.Log("<color=red>[ERROR]</color> Metadata network error: " + metadataRequest.error);
response.state = MetadataInfo.MetadataRequestState.RETRIEVAL_FAILED;
response.exception = new MetadataRetrievalException();
}
// Otherwise the request succeeded, so attempt to parse and return.
else
{
string metadataString = metadataRequest.downloadHandler.text;
try
{
this.metadata = JsonUtility.FromJson <MetadataBase>(metadataString);
response.state = MetadataInfo.MetadataRequestState.SUCCESS;
response.metadata = this.metadata;
}
catch (Exception e)
{
Debug.Log("<color=red>[ERROR]</color> Failed to parse metadata: " + metadataString);
response.state = MetadataInfo.MetadataRequestState.PARSE_FAILED;
response.exception = new MetadataParseException(e);
}
}
// Trigger our callback.
listener(response);
}