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Program.cs
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141 lines (122 loc) · 3.93 KB
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using System.Text.Json;
int exitCode = 0;
string? line;
while ((line = await Console.In.ReadLineAsync()) is not null)
{
if (string.IsNullOrWhiteSpace(line))
continue;
WorkerRequest? request;
try
{
request = JsonSerializer.Deserialize<WorkerRequest>(
line,
WorkerJson.Options);
}
catch (Exception ex)
{
await Console.Error.WriteLineAsync(ex.Message);
return 2;
}
if (request is null)
return 2;
try
{
WorkerResponse response = request.Name switch
{
"Echo" => Echo(request),
"Sleep" => await SleepAsync(request),
"AllocateMemory" => await AllocateMemoryAsync(request),
"Crash" => Crash(),
_ => new WorkerResponse(
Succeeded: false,
Message: $"Unknown command '{request.Name}'.",
ErrorCode: "UnknownCommand"),
};
await Console.Out.WriteLineAsync(JsonSerializer.Serialize(response, WorkerJson.Options));
exitCode = response.Succeeded ? 0 : 3;
}
catch (Exception ex)
{
await Console.Error.WriteLineAsync(ex.ToString());
return 1;
}
}
return exitCode;
static WorkerResponse Echo(WorkerRequest request)
{
string? message = request.Arguments is not null &&
request.Arguments.TryGetValue("message", out JsonElement value) &&
value.ValueKind == JsonValueKind.String
? value.GetString()
: null;
return new WorkerResponse(
Succeeded: true,
Message: "Echo completed.",
Value: JsonSerializer.SerializeToElement(message, WorkerJson.Options));
}
static async Task<WorkerResponse> SleepAsync(WorkerRequest request)
{
int delayMs = 250;
if (request.Arguments is not null &&
request.Arguments.TryGetValue("delayMs", out JsonElement value) &&
value.ValueKind == JsonValueKind.Number &&
value.TryGetInt32(out int parsedDelayMs))
{
delayMs = parsedDelayMs;
}
await Task.Delay(delayMs);
return new WorkerResponse(
Succeeded: true,
Message: $"Slept for {delayMs}ms.",
Value: JsonSerializer.SerializeToElement(delayMs, WorkerJson.Options));
}
static async Task<WorkerResponse> AllocateMemoryAsync(WorkerRequest request)
{
int megabytes = ReadInt32Argument(request, "megabytes", 64);
int holdMs = ReadInt32Argument(request, "holdMs", 250);
if (megabytes <= 0)
{
return new WorkerResponse(
Succeeded: false,
Message: "megabytes must be greater than zero.",
ErrorCode: "InvalidArgument");
}
byte[] buffer = GC.AllocateUninitializedArray<byte>(checked(megabytes * 1024 * 1024));
for (int i = 0; i < buffer.Length; i += 4096)
buffer[i] = 1;
await Task.Delay(Math.Max(holdMs, 0));
return new WorkerResponse(
Succeeded: true,
Message: $"Allocated {megabytes}MB.",
Value: JsonSerializer.SerializeToElement(megabytes, WorkerJson.Options));
}
static WorkerResponse Crash()
{
Environment.Exit(42);
return new WorkerResponse(false, "unreachable", ErrorCode: "Unreachable");
}
static int ReadInt32Argument(WorkerRequest request, string name, int defaultValue)
{
if (request.Arguments is not null &&
request.Arguments.TryGetValue(name, out JsonElement value) &&
value.ValueKind == JsonValueKind.Number &&
value.TryGetInt32(out int parsedValue))
{
return parsedValue;
}
return defaultValue;
}
internal sealed record WorkerRequest(
string Kind,
string Name,
Dictionary<string, JsonElement>? Arguments,
Dictionary<string, string>? Metadata);
internal sealed record WorkerResponse(
bool Succeeded,
string? Message = null,
JsonElement? Value = null,
string? ErrorCode = null);
internal static class WorkerJson
{
public static readonly JsonSerializerOptions Options = new(JsonSerializerDefaults.Web);
}