module executable import os import time import dl import strconv import live // The live reloader code is implemented here. // NB: new_live_reload_info will be called by generated C code inside main() pub fn new_live_reload_info(original string, vexe string, vopts string, live_fn_mutex voidptr, live_linkfn live.FNLinkLiveSymbols) &live.LiveReloadInfo { file_base := os.file_name(original).replace('.v', '') so_dir := os.cache_dir() so_extension := dl.dl_ext // $if msvc { so_extension = '.dll' } $else { so_extension = '.so' } return &live.LiveReloadInfo{ original: original vexe: vexe vopts: vopts live_fn_mutex: live_fn_mutex live_linkfn: live_linkfn so_extension: so_extension so_name_template: '${so_dir}/tmp.%d.${file_base}' live_lib: 0 reloads: 0 reload_time_ms: 0 } } // NB: start_reloader will be called by generated code inside main(), to start // the hot code reloader thread. start_reloader is executed in the context of // the original main thread. pub fn start_reloader(mut r live.LiveReloadInfo) { // The shared library should be loaded once in the main thread // If that fails, the program would crash anyway, just provide // an error message to the user and exit: r.reloads++ compile_and_reload_shared_lib(mut r) or { eprintln( err ) exit(1) } go reloader(mut r) } [if debuglive] fn elog(r &live.LiveReloadInfo, s string){ eprintln(s) } fn compile_and_reload_shared_lib(mut r live.LiveReloadInfo) ?bool { sw := time.new_stopwatch({}) new_lib_path := compile_lib(mut r) or { return error('errors while compiling $r.original') } elog(r,'> compile_and_reload_shared_lib compiled: ${new_lib_path}') load_lib(mut r, new_lib_path ) r.reload_time_ms = int(sw.elapsed().milliseconds()) return true } fn compile_lib(mut r live.LiveReloadInfo) ?string { new_lib_path, new_lib_path_with_extension := current_shared_library_path(mut r) cmd := '$r.vexe $r.vopts -o $new_lib_path $r.original' elog(r,'> compilation cmd: $cmd') cwatch := time.new_stopwatch({}) recompilation_result := os.exec( cmd ) or { eprintln('recompilation failed') return none } elog(r,'compilation took: ${cwatch.elapsed().milliseconds()}ms') if recompilation_result.exit_code != 0 { eprintln('recompilation error:') eprintln( recompilation_result.output ) return none } if !os.exists( new_lib_path_with_extension ) { eprintln('new_lib_path: $new_lib_path_with_extension does not exist') return none } return new_lib_path_with_extension } fn current_shared_library_path(mut r live.LiveReloadInfo) (string, string) { lib_path := strconv.v_sprintf(r.so_name_template.replace('\\', '\\\\'), r.reloads) lib_path_with_extension := lib_path + r.so_extension return lib_path, lib_path_with_extension } fn load_lib(mut r live.LiveReloadInfo, new_lib_path string) { elog(r,'live mutex locking...') C.pthread_mutex_lock(r.live_fn_mutex) elog(r,'live mutex locked') // if r.cb_locked_before != voidptr(0) { r.cb_locked_before( r ) } // protected_load_lib(mut r, new_lib_path) // r.reloads_ok++ if r.cb_locked_after != voidptr(0) { r.cb_locked_after( r ) } // elog(r,'live mutex unlocking...') C.pthread_mutex_unlock(r.live_fn_mutex) elog(r,'live mutex unlocked') } fn protected_load_lib(mut r live.LiveReloadInfo, new_lib_path string) { if r.live_lib != 0 { dl.close( r.live_lib ) r.live_lib = 0 } r.live_lib = dl.open(new_lib_path, dl.rtld_lazy) if r.live_lib == 0 { eprintln('opening $new_lib_path failed') exit(1) } r.live_linkfn( r.live_lib ) elog(r,'> load_lib OK, new live_lib: $r.live_lib') // removing the .so file from the filesystem after dlopen-ing // it is safe, since it will still be mapped in memory os.rm( new_lib_path ) } // NB: r.reloader() is executed in a new, independent thread fn reloader(mut r live.LiveReloadInfo) { // elog(r,'reloader, r: $r') mut last_ts := os.file_last_mod_unix( r.original ) for { if r.cb_recheck != voidptr(0) { r.cb_recheck( r ) } now_ts := os.file_last_mod_unix( r.original ) if last_ts != now_ts { r.reloads++ last_ts = now_ts r.last_mod_ts = last_ts if r.cb_before != voidptr(0) { r.cb_before( r ) } compile_and_reload_shared_lib(mut r) or { if r.cb_compile_failed != voidptr(0) { r.cb_compile_failed( r ) } if r.cb_after != voidptr(0) { r.cb_after( r ) } continue } if r.cb_after != voidptr(0) { r.cb_after( r ) } } if r.recheck_period_ms > 0 { time.sleep_ms(r.recheck_period_ms) } } }