//public async Task GetMetadata(byte[] asset)
//{
// var key = Convert.ToBase64String(asset);
// if (_Cache.ContainsKey(key))
// return;
// var assetMetadata = new AssetMetadata() { Asset = asset, Display = key };
// _Cache.TryAdd(key, assetMetadata);
// AssetMatadataChanged(assetMetadata); // firstly, with initial Display
// await GetAssetMatadataAsync(assetMetadata);
// AssetMatadataChanged(assetMetadata); // again, now with updated Display
//}
public void GetMetadata(string key, byte[] asset)
{
Task.Factory.StartNew(async() => {
var assetMetadata = new AssetMetadata()
{
Asset = asset, Display = key
};
_Cache.TryAdd(key, assetMetadata);
await GetAssetMatadataAsync(assetMetadata);
try
{
if (AssetMatadataChanged != null)
{
AssetMatadataChanged(assetMetadata);
}
}
catch (Exception e)
{
InfrastructureTrace.Information($"Error invoking subscriber: {e.Message}");
}
});
}
async Task GetAssetMatadataAsync(AssetMetadata assetMetadata)
{
var uri = new Uri(string.Format($"http://{Utils.Config("assetsDiscovery")}/AssetMetadata/Index/" + HttpServerUtility.UrlTokenEncode(assetMetadata.Asset)));
InfrastructureTrace.Information($"Loading asset metadata from web: {uri.AbsoluteUri}");
using (var response = await new HttpClient().GetAsync(uri.AbsoluteUri))
{
if (response.IsSuccessStatusCode)
{
var remoteString = await response.Content.ReadAsStringAsync();
try
{
//Version currentVersion = null;
//Version remoteVersion = null;
var remoteJson = JsonConvert.DeserializeObject <AssetMetadataJson>(remoteString);
//currentVersion = _Cache.Value.ContainsKey(_hash) ? new Version(_Cache.Value[_hash].version) : new Version();
//remoteVersion = remoteJson.version == null ? new Version() : new Version(remoteJson.version);
//TODO: check if newer version
//if (remoteVersion > currentVersion)
//TODO: fetch image
if (string.IsNullOrWhiteSpace(remoteJson.name))
{
//assetMetadata.Display += " (No metadada)";
}
else
{
lock (_lock)
{
assetMetadata.Display = remoteJson.name;
_CacheJsonStore.Value[Convert.ToBase64String(assetMetadata.Asset)] = remoteJson;
_CacheJsonStore.Save();
}
}
}
catch (Exception e)
{
InfrastructureTrace.Information($"Error fetching asset metadata from url: {uri.AbsoluteUri}");
assetMetadata.Display += " (Metadata error)";
}
}
else
{
assetMetadata.Display += " (Network error)";
}
}
}
public AssetsMetadata(WalletManager wallet)
{
try
{
string directory = Utils.PathCombine(Path.GetDirectoryName(Assembly.GetEntryAssembly().Location), Utils.Config("assetsDir"));
_CacheJsonStore.FileName = Utils.PathCombine(directory, "metadata.json");
_CacheJsonStore.Value.ToList().ForEach(t => _Cache.TryAdd(t.Key, new AssetMetadata()
{
Asset = Convert.FromBase64String(t.Key), Display = t.Value.name
}));
_Cache.TryAdd(Convert.ToBase64String(Consensus.Tests.zhash), new AssetMetadata()
{
Asset = Consensus.Tests.zhash, Display = ZEN
});
wallet.OnItems += OnItems;
} catch (Exception e)
{
InfrastructureTrace.Error("AssetsMetadata ctor", e);
}
}
