private static Task <FunctionExecutor> GetAsync(string functionDir, string functionJsonFileName, TraceWriter log)
{
TaskCompletionSource <FunctionExecutor> tcs;
lock (_d) {
if (_d.TryGetValue(functionJsonFileName, out tcs))
{
return(tcs.Task);
}
_d.Add(functionJsonFileName, tcs = new TaskCompletionSource <FunctionExecutor>());
}
try {
var functionJsonLastWriteTime = File.GetLastWriteTimeUtc(functionJsonFileName);
var functionJson = JObject.Parse(File.ReadAllText(functionJsonFileName));
var metadata = functionJson["cloudPad"];
var applicationBase = (string)metadata["applicationBase"];
var scriptFile = (string)metadata["scriptFile"];
var typeName = (string)metadata["typeName"];
var methodName = (string)metadata["methodName"];
var providerName = (string)metadata["providerName"];
var connectionString = (string)metadata["connectionString"];
log.Info($"InitializingFunction ApplicationBase='{applicationBase}', ScriptFile='{scriptFile}'", nameof(FunctionExecutor));
var root = Path.GetFullPath(Path.Combine(functionDir, applicationBase));
var fullPath = Path.Combine(root, scriptFile);
var dir = Path.GetDirectoryName(fullPath);
// binder...
UpdateAssemblyResolveHandler(functionDir, root);
log.Info($"ScriptFileLoad '{fullPath}'", nameof(FunctionExecutor));
var assembly = Assembly.LoadFrom(fullPath);
var type = assembly.GetType(typeName);
var method = type.GetMethod(methodName, BindingFlags.Public | BindingFlags.Instance);
var func = FunctionBinder.Bind(method);
// launch cleanup task
var f = new FunctionExecutor(func, functionJsonLastWriteTime, dir, providerName: providerName, connectionString: connectionString);
tcs.SetResult(f);
} catch (Exception ex) {
tcs.SetException(ex);
}
return(tcs.Task);
}
public static async Task Run(
CloudBlockBlob blob,
System.Threading.CancellationToken cancellationToken,
ExecutionContext executionContext, // note that this name is also found in namespace "System.Threading" we don't want that
TraceWriter log)
{
var func = await FunctionExecutor.GetAndInvalidateAsync(executionContext.FunctionDirectory, log);
var arguments = new FunctionArgumentList();
arguments.AddArgument(typeof(CloudBlockBlob), blob);
arguments.AddArgument(typeof(System.Threading.CancellationToken), cancellationToken);
arguments.AddArgument(typeof(ITraceWriter), new TraceWriterWrapper(log));
var cloudStorageHelperType = typeof(ICloudStorage);
if (func.Function.ParameterBindings.HasBinding(cloudStorageHelperType))
{
arguments.AddArgument(cloudStorageHelperType, new CloudStorage(CloudStorageAccount.Parse(Environment.GetEnvironmentVariable("AzureWebJobsStorage"))));
}
await func.InvokeAsync(arguments, log);
}
