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const ThreadPool = @import("thread_pool");
pub const Batch = ThreadPool.Batch;
pub const Task = ThreadPool.Task;
const Node = ThreadPool.Node;
pub const Completion = AsyncIO.Completion;
const std = @import("std");
pub const AsyncIO = @import("io");
const Output = @import("./global.zig").Output;
const IdentityContext = @import("./identity_context.zig").IdentityContext;
const HTTP = @import("./http_client_async.zig");
const NetworkThread = @This();
const Environment = @import("./global.zig").Environment;
const Lock = @import("./lock.zig").Lock;
const FIFO = @import("./io/fifo.zig").FIFO;
/// Single-thread in this pool
io: *AsyncIO = undefined,
thread: std.Thread = undefined,
waker: AsyncIO.Waker = undefined,
queued_tasks_mutex: Lock = Lock.init(),
queued_tasks: Batch = .{},
processing_tasks: Batch = .{},
timer: std.time.Timer = undefined,
pub var global: NetworkThread = undefined;
pub var global_loaded: std.atomic.Atomic(u32) = std.atomic.Atomic(u32).init(0);
const log = Output.scoped(.NetworkThread, true);
fn queueEvents(this: *@This()) void {
this.queued_tasks_mutex.lock();
defer this.queued_tasks_mutex.unlock();
if (this.queued_tasks.len == 0)
return;
log("Received {d} tasks\n", .{this.queued_tasks.len});
this.processing_tasks.push(this.queued_tasks);
this.queued_tasks = .{};
}
pub fn processEvents(this: *@This()) void {
processEvents_(this) catch {};
unreachable;
}
/// Should only be called on the HTTP thread!
fn processEvents_(this: *@This()) !void {
while (true) {
this.queueEvents();
var count: usize = 0;
while (this.processing_tasks.pop()) |task| {
var callback = task.callback;
callback(task);
if (comptime Environment.allow_assert) {
count += 1;
}
}
if (comptime Environment.allow_assert) {
if (count > 0)
log("Processed {d} tasks\n", .{count});
}
var start: i128 = 0;
if (comptime Environment.isDebug) {
start = std.time.nanoTimestamp();
}
Output.flush();
this.io.wait(this, queueEvents);
if (comptime Environment.isDebug) {
var end = std.time.nanoTimestamp();
log("Waited {any}\n", .{std.fmt.fmtDurationSigned(@truncate(i64, end - start))});
Output.flush();
}
}
}
pub fn schedule(this: *@This(), batch: Batch) void {
if (batch.len == 0)
return;
{
this.queued_tasks_mutex.lock();
defer this.queued_tasks_mutex.unlock();
this.queued_tasks.push(batch);
}
if (comptime Environment.isLinux) {
const one = @bitCast([8]u8, @as(usize, batch.len));
_ = std.os.write(this.waker.fd, &one) catch @panic("Failed to write to eventfd");
} else {
this.waker.wake() catch @panic("Failed to wake");
}
}
const CachedAddressList = struct {
address_list: *std.net.AddressList,
expire_after: u64,
key: u64,
index: ?u32 = null,
invalidated: bool = false,
pub fn hash(name: []const u8, port: u16) u64 {
var hasher = std.hash.Wyhash.init(0);
hasher.update(name);
hasher.update(":");
hasher.update(std.mem.asBytes(&port));
return hasher.final();
}
pub fn init(key: u64, address_list: *std.net.AddressList, now: u64) CachedAddressList {
return CachedAddressList{
.address_list = address_list,
.expire_after = now + std.time.ms_per_hour,
.key = key,
};
}
pub fn invalidate(this: *CachedAddressList) void {
if (!this.invalidated) {
this.invalidated = true;
this.address_list.deinit();
}
_ = address_list_cached.remove(this.key);
}
};
pub const AddressListCache = std.HashMap(u64, CachedAddressList, IdentityContext(u64), 80);
pub var address_list_cached: AddressListCache = undefined;
pub fn getAddressList(allocator: std.mem.Allocator, name: []const u8, port: u16) !*std.net.AddressList {
// const hash = CachedAddressList.hash(name, port);
// const now = @intCast(u64, @maximum(0, std.time.milliTimestamp()));
// if (address_list_cached.getPtr(hash)) |cached| {
// if (cached.expire_after > now) {
// return cached;
// }
// cached.address_list.deinit();
// }
return try std.net.getAddressList(allocator, name, port);
}
pub var has_warmed = false;
pub fn warmup() !void {
if (has_warmed or global_loaded.load(.Monotonic) > 0) return;
has_warmed = true;
try init();
}
pub fn init() !void {
if ((global_loaded.swap(1, .Monotonic)) == 1) return;
AsyncIO.global_loaded = true;
global = NetworkThread{
.timer = try std.time.Timer.start(),
};
if (comptime Environment.isLinux) {
const fd = try std.os.eventfd(0, std.os.linux.EFD.CLOEXEC | 0);
global.waker = .{ .fd = fd };
} else if (comptime Environment.isMac) {
global.waker = try AsyncIO.Waker.init(@import("./global.zig").default_allocator);
} else {
@compileLog("TODO: Waker");
}
global.thread = try std.Thread.spawn(.{ .stack_size = 64 * 1024 * 1024 }, HTTP.onThreadStartNew, .{
global.waker,
});
global.thread.detach();
}
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