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perusing zig stdlib sources revealed idiomatic filter

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This commit is contained in:
Emil Lerch 2023-05-10 15:21:21 -07:00
parent 4a1548b4be
commit 2f349f2e50
Signed by: lobo
GPG Key ID: A7B62D657EF764F8
1 changed files with 46 additions and 62 deletions
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110
src/main.zig
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@ -26,29 +26,13 @@ var watcher = Watch.init(executorChanged);
const log = std.log.scoped(.main);
pub const std_options = struct {
// Set the log level to info
pub const log_level = .info;
pub const log_level = .debug;
// Define logFn to override the std implementation
pub const logFn = myLogFn;
pub const log_scope_levels = &[_]std.log.ScopeLevel{
.{ .scope = .watch, .level = .info },
};
};
pub fn myLogFn(
comptime level: std.log.Level,
comptime scope: @TypeOf(.EnumLiteral),
comptime format: []const u8,
args: anytype,
) void {
// Ignore all non-error logging from sources other than
// .my_project, .nice_library and the default
switch (scope) {
.watch => if (@enumToInt(level) >= @enumToInt(std.log.Level.debug))
return, // Kill debug messages
else => {},
}
std.log.defaultLog(level, scope, format, args);
}
fn serve() !void {
// if (some path routing thing) {
@ -94,61 +78,61 @@ fn getExecutor(key: usize) !serve_op {
}
// This works
fn executorChanged(watch: usize) void {
log.debug("executor changed event", .{});
for (&executors) |*executor| {
if (executor.watch) |w| {
if (w == watch) {
if (executor.library) |l| {
log.info("library {s} changed. Unloading library", .{executor.path});
// TODO: These two lines could introduce a race. Right now that would mean a panic
executor.serve = null;
if (std.c.dlclose(l) != 0)
@panic("System unstable: Error after library open and cannot close");
}
executor.library = null;
executor.serve = null;
// NOTE: Would love to reload the library here, but that action
// does not seem to be thread safe
}
}
}
}
// NOTE: this will be on a different thread. This code does not work, and I
// am fairly certain it is because we can't share a function pointer between
// threads
// fn executorChanged(watch: usize) void {
// std.debug.print("executor with watch {d} changed\n", .{watch});
// log.debug("executor changed event", .{});
// for (&executors) |*executor| {
// if (executor.watch) |w| {
// if (w == watch) {
// if (executor.library) |l| {
// std.debug.print("reloading executor at path: {s}\n", .{executor.path});
// const newlib = dlopen(executor.path) catch {
// std.debug.print("could not reload! error opening library\n", .{});
// return;
// };
// errdefer if (std.c.dlclose(newlib) != 0)
// @panic("System unstable: Error after library open and cannot close");
// const serve_function = std.c.dlsym(newlib, "serve");
// if (serve_function == null) {
// std.debug.print("could not reload! error finding symbol\n", .{});
// return;
// }
// // new lib all loaded up - do the swap and close the old
// std.debug.print("updating function and library\n", .{});
// executor.serve = @ptrCast(serve_op, serve_function.?);
// executor.library = newlib;
// log.info("library {s} changed. Unloading library", .{executor.path});
// // TODO: These two lines could introduce a race. Right now that would mean a panic
// executor.serve = null;
// if (std.c.dlclose(l) != 0)
// @panic("System unstable: Error after library open and cannot close");
// std.debug.print("closed old library\n", .{});
// }
// }
// executor.library = null;
// executor.serve = null;
// // NOTE: Would love to reload the library here, but that action
// // does not seem to be thread safe
// }
// }
// }
// }
// NOTE: this will be on a different thread. This code does not work, and I
// am fairly certain it is because we can't share a function pointer between
// threads
fn executorChanged(watch: usize) void {
log.debug("executor with watch {d} changed", .{watch});
for (&executors) |*executor| {
if (executor.watch) |w| {
if (w == watch) {
if (executor.library) |l| {
log.debug("reloading executor at path: {s}", .{executor.path});
const newlib = dlopen(executor.path) catch {
log.warn("could not reload! error opening library", .{});
return;
};
errdefer if (std.c.dlclose(newlib) != 0)
@panic("System unstable: Error after library open and cannot close");
const serve_function = std.c.dlsym(newlib, "serve");
if (serve_function == null) {
log.warn("could not reload! error finding symbol", .{});
return;
}
// new lib all loaded up - do the swap and close the old
log.debug("updating function and library", .{});
executor.serve = @ptrCast(serve_op, serve_function.?);
executor.library = newlib;
if (std.c.dlclose(l) != 0)
@panic("System unstable: Error after library open and cannot close");
log.debug("closed old library", .{});
}
}
}
}
}
fn dlopen(path: [:0]const u8) !*anyopaque {
// We need now (and local) because we're about to call it
const lib = std.c.dlopen(path, c.RTLD_NOW);