public async Task <TaskSetResult> Execute(List <TaskParameters> tasks, TaskEngineConfig engineConfig)
{
var tasksetresult = new TaskSetResult();
#region Iterate through all tasks in collection
foreach (var task in tasks)
{
try
{
// Create TaskAdapter instance based on configuration object:
using (var t = LoadAdapter(task))
{
// Merge return values from previous step(s) into parameter set (overwriting configuration parameters, if required):
task.MergeParameters(tasksetresult.ReturnValues);
#region Execute TaskAdapter and handle result
var result = await t.ExecuteTask(task);
if (result.Success == false || result.Exceptions.Any()) // Execution failed, or succeeded with errors
{
// Generate logging data for caller:
tasksetresult.LogMessage.AppendLine($"Task [{task.TaskName}] {(result.Success ? "succeeded with errors" : "execution failed")}");
foreach (var ex in result.Exceptions)
{
tasksetresult.LogMessage.AppendLine(ex.ToString());
}
// Update return value, unless it is already set to a higher (i.e. worse) value:
if (tasksetresult.ReturnValue < (result.Success ? 7 : 8))
{
tasksetresult.ReturnValue = (result.Success ? 7 : 8);
}
}
else // Execution succeeded
{
tasksetresult.LogMessage.AppendLine($"Task [{task.TaskName}] executed successfully");
if (tasksetresult.ReturnValue < 0)
{
tasksetresult.ReturnValue = 0;
}
// Merge any return values output by TaskAdapter into overall set result:
tasksetresult.MergeReturnValues(result.ReturnValues);
}
#endregion
}
}
catch (LoadAdapterException ex)
{
// Exception loading adapter object; if value returned is higher (i.e. worse) than current return value, update:
if (tasksetresult.ReturnValue < ex.ErrorCode)
{
tasksetresult.ReturnValue = ex.ErrorCode;
}
// Add details to logging output:
tasksetresult.LogMessage.AppendLine($"Task [{task.TaskName}] failed adapter creation: {ex}");
}
catch (Exception ex) // General exception (likely during TaskAdapter execution):
{
if (tasksetresult.ReturnValue < 9)
{
tasksetresult.ReturnValue = 9;
}
if (ex is AggregateException ae) // Exception caught from async task; simplify if possible
{
ex = TaskUtilities.General.SimplifyAggregateException(ae);
}
// Add details to logging output:
tasksetresult.LogMessage.AppendLine($"Task [{task.TaskName}] execution error: {ex}");
}
// If this step was not successful and caller requested halting batch when error encountered, stop now:
if (tasksetresult.ReturnValue != 0 && engineConfig.HaltOnError)
{
tasksetresult.LogMessage.AppendLine("Halting task list due to error executing previous step");
break;
}
}
#endregion
#region If return value debugging requested, log final set of return values
if (engineConfig.DebugReturnValues)
{
foreach (var returnvalue in tasksetresult.ReturnValues)
{
logger.LogDebug("RETURN VALUE {@returnvalue}", new { key = returnvalue.Key, value = returnvalue.Value });
}
}
#endregion
return(tasksetresult);
}
static void Main(string[] args)
{
var engineConfig = new TaskEngineConfig(); // Engine execution parameter collection
string jobName = null; // For logging purposes
string taskFileName = null; // For running a single file
string taskFolderName = null; // For running all files in a folder
var cmdlineTaskParameters = new Dictionary <string, string>(StringComparer.OrdinalIgnoreCase); // Global overrides for task parameters
#region Load application configuration
var env = Environment.GetEnvironmentVariable("DOTNET_ENVIRONMENT");
var configbuilder = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("appsettings.json", optional: true, reloadOnChange: false)
.AddJsonFile($"appsettings.{env}.json", optional: true, reloadOnChange: false)
.AddEnvironmentVariables();
if (env == "Development")
{
configbuilder.AddUserSecrets <Program>();
}
if (args != null)
{
var configargs = new List <string>(); // Store unrecognized/generic parameters
#region Parse command-line arguments
// Name/value pairs with an "@" prefix are TaskParameter override values:
var REGEX_TASKPARM = new Regex(@"^@(?<name>\S+)[=](?<value>.+)$");
// Flag-only parameters (i.e. not a name/value pair):
var REGEX_FLAGPARM = new Regex(@"^(--|-|/)?(?<value>[\S-[=]]+)$");
// Other name/value pairs (optionally starting with any of "-", "--" or "/") are program-level:
var REGEX_NAMEDPARM = new Regex(@"^(--|-|/)?(?<name>\S+)[=](?<value>.+)$");
var REGEX_NAMEDPARM_SHORTKEY = new Regex(@"^-(?![-])");
// Iterate through all arguments, looking for recognized values (may short-circuit normal
// configuration behavior to allow custom parameters for this application or any adapter)
foreach (var arg in args)
{
// Check for task parameter override value first
var match = REGEX_TASKPARM.Match(arg);
if (match.Success)
{
cmdlineTaskParameters[$"Parameters:{match.Groups["name"].Value}"] = match.Groups["value"].Value;
}
else
{
// Check for flag-only parameter:
match = REGEX_FLAGPARM.Match(arg);
if (match.Success)
{
// Check for reserved configuration flag values; if not one of the specified supported
// options, add to configuration collection (DI clients may recognize/use it):
switch (match.Groups["value"].Value.ToLowerInvariant())
{
case "console": // Enable console logging
// Add console sink to Serilog config (added at node "99" to prevent overwriting
// any existing sinks; note that if a console sink is already configured, this
// will result in messages being output to console twice)
configargs.Add("Serilog:WriteTo:99:Name=Console");
break;
case "debug": // Set minimum logging level to Debug
configargs.Add("Serilog:MinimumLevel=Debug");
break;
case "haltonerror": // Halt batch of tasks if any individual step fails
engineConfig.HaltOnError = true;
break;
case "debugreturn": // Dump return values at end of execution to debug log
engineConfig.DebugReturnValues = true;
break;
default: // Unrecognized value - add to config collection
configargs.Add(arg);
break;
}
;
}
else
{
// Check for named parameter:
match = REGEX_NAMEDPARM.Match(arg);
if (match.Success)
{
// Check for reserved configuration names; if not one of the specified supported
// options, add to configuration collection (DI clients may recognize/use it):
switch (match.Groups["name"].Value.ToLowerInvariant())
{
case "jobname": // Name of job, for logging purposes
jobName = match.Groups["value"].Value;
break;
case "taskfile": // Name of specific task file to execute
taskFileName = match.Groups["value"].Value;
break;
case "taskfolder": // Name of folder of task files to execute
taskFolderName = match.Groups["value"].Value;
// Use folder name as default jobName, unless already provided:
if (string.IsNullOrEmpty(jobName))
{
jobName = taskFolderName;
}
break;
default: // Unrecognized parameter - add to config collection
// (replace single leading "-" with "--", as MS config provider will
// hysterically throw a formatting exception for unmapped "short keys")
configargs.Add(REGEX_NAMEDPARM_SHORTKEY.Replace(arg, "--"));
break;
}
;
}
else
{
// Argument is in unrecognized format, just add to configuration collection:
configargs.Add(arg);
}
}
}
}
// If any arguments were added to configuration collection, add to ConfigBuilder now:
if (configargs.Count > 0)
{
configbuilder.AddCommandLine(configargs.ToArray());
}
#endregion
}
var config = configbuilder.Build();
#endregion
// Build logger configuration from application config file and create logger:
Log.Logger = new LoggerConfiguration()
.ReadFrom.Configuration(config)
.Enrich.WithProperty("AppVer", typeof(Program).Assembly.GetName().Version)
.Enrich.WithProperty("LibVer", typeof(TaskEngine).Assembly.GetName().Version)
.CreateLogger();
// Set up services and configurations for dependency injection:
var serviceCollection = new ServiceCollection()
.AddLogging(configure => configure.AddSerilog(dispose: true))
.AddMemoryCache()
.AddSingleton <IConfiguration>(config)
.Configure <TaskUtilities.SmtpOptions>(config.GetSection("Smtp"))
.AddTransient <TaskUtilities.Smtp>()
.AddSingleton(x => ActivatorUtilities.CreateInstance <TaskEngine>(x, jobName))
;
using (var serviceProvider = serviceCollection.BuildServiceProvider())
{
var adapterConfigs = new List <TaskParameters>();
var logMessage = new StringBuilder();
#region Create collection of adapter configurations from incoming parameters
try
{
IOrderedEnumerable <string> configFiles = null;
if (!string.IsNullOrEmpty(taskFolderName))
{
// Running all adapter files in folder; retrieve list of JSON files:
configFiles = Directory.EnumerateFiles(taskFolderName, "*.json")
// Ensure file extension is actually JSON (avoid false-positives with 8.3 filenames):
.Where(filename => filename.EndsWith(".json", StringComparison.OrdinalIgnoreCase))
// Sort files in alphabetical order, to allow deliberate ordering of steps:
.OrderBy(filename => filename);
}
else if (!string.IsNullOrEmpty(taskFileName))
{
// Running single task file only - create collection with single entry:
configFiles = new List <string>()
{
taskFileName
}.OrderBy(x => x);
}
// (else leave configFiles null, and fall through to error logic below)
#region Iterate through all files, constructing parameter objects
if (configFiles != null)
{
foreach (var configFile in configFiles)
{
try
{
// Build configuration object from Json file (combined with override parameters
// from command line), bind to a TaskParameterTemplate object:
var taskconfig = new ConfigurationBuilder()
.AddJsonFile(configFile, optional: false, reloadOnChange: false)
.AddInMemoryCollection(cmdlineTaskParameters)
.Build();
var taskparms = taskconfig.Get <TaskParametersTemplate>().EnsureValid();
// Create TaskParameters object from template object, and add to collection:
adapterConfigs.Add(new TaskParameters(taskparms.Parameters)
{
TaskName = string.IsNullOrEmpty(taskparms.TaskName) ? Path.GetFileName(configFile) : taskparms.TaskName,
AdapterClassName = taskparms.AdapterClassName,
AdapterDLLName = taskparms.AdapterDLLName,
AdapterDLLPath = taskparms.AdapterDLLPath,
Configuration = taskconfig
});
}
catch (Exception ex)
{
// Error reading file or deserializing configuration object; if this is not part of a batch OR
// batch specifies halt on error, empty list and re-throw exception to stop all processing:
if (string.IsNullOrEmpty(taskFolderName) || engineConfig.HaltOnError)
{
adapterConfigs.Clear();
throw new Exception($"Error reading configuration file {configFile}", ex);
}
else // Otherwise just log error and proceed with other configurations:
{
Log.Logger.Warning(ex, $"Error reading configuration file {configFile}, skipped");
logMessage.AppendLine($"Error reading configuration file {configFile}, skipped");
}
}
}
}
#endregion
}
catch (Exception ex)
{
Log.Logger.Error(ex, "Error retrieving task configurations");
}
#endregion
#region Execute TaskAdapter collection
if (adapterConfigs.Count > 0)
{
// Activate TaskEngine service, and pass in TaskAdapter configuration collection for (synchronous) execution:
using var te = serviceProvider.GetRequiredService <TaskEngine>();
var result = te.Execute(adapterConfigs, engineConfig).Result;
// Set executable exit code to execution return value, save log message for use below:
Environment.ExitCode = result.ReturnValue;
logMessage.Append(result.LogMessage);
}
else // No configurations available - exit with error message
{
Environment.ExitCode = 1;
logMessage.Append("No task configurations available");
}
#endregion
#region Notify users of execution results, if required
if (logMessage.Length > 0)
{
//Console.Error.WriteLine(logMessage); // TODO: UNCOMMENT CONSOLE OUTPUT
}
// If configuration specifies that results should be emailed (or it specifies that errors should be
// emailed and application is NOT exiting with success), send alert now:
var sendresultsto = (string.IsNullOrEmpty(config["sendresult"]) && Environment.ExitCode != 0) ?
config["senderror"] : config["sendresult"];
if (!string.IsNullOrEmpty(sendresultsto))
{
using (var smtp = serviceProvider.GetService <TaskUtilities.Smtp>())
{
smtp.SendEmail($"Execution {(Environment.ExitCode == 0 ? "results" : "ERROR")} job [{jobName}] on {Environment.MachineName}",
$"Return code {Environment.ExitCode} at {DateTime.Now:yyyy-MM-dd HH:mm:ss}<br/><br/><pre>{logMessage}</pre>",
sendresultsto).Wait();
}
}
#endregion
}
}