I try to create logger from within the libuv server (simple). I followed the examples I barely found on the net.
I do manage to write to file but when I try to write to the log from some different place in the code I'm getting exception.
This is what I have:
const char* logfile = "wsserver.log";
char buf[] = "Server Started!\n";
uv_fs_t open_req;
uv_fs_t write_req;
uv_fs_t close_req;
int resultFD;
void open_cb(uv_fs_t* req);
void write_cb(uv_fs_t* req);
void close_cb(uv_fs_t* req);
void open_cb(uv_fs_t* req) {
resultFD = req->result;
const uv_buf_t buf1 = uv_buf_init(&buf, sizeof(buf));
if (resultFD == -1) {
fprintf(stderr, "Error opening file: %s.\n",
uv_strerror(resultFD));
}
uv_fs_req_cleanup(req);
uv_fs_write(loop, &write_req, resultFD, &buf1, sizeof(buf1), -1, write_cb);
}
void write_cb(uv_fs_t* req) {
int result = req->result;
if (result == -1) {
fprintf(stderr, "Error writting data to file: %s.\n",
uv_strerror(result));
}
uv_fs_req_cleanup(req);
uv_fs_close(loop, &close_req, open_req.result, close_cb);
}
void close_cb(uv_fs_t* req) {
int result = req->result;
if (result == -1) {
fprintf(stderr, "Error closing file: %s.\n",
uv_strerror(result));
}
uv_fs_req_cleanup(req);
}
int main(int argc, char** argv)
{
int port = 8011;
loop = uv_default_loop();
if (server_start(port))
{
return 1;
}
int r = uv_fs_open(loop, &open_req, logfile, O_CREAT | O_APPEND, 0644, open_cb);
if (r) {
fprintf(stderr, "Error opening file: %s.\n",
uv_strerror(r));
}
uv_run(loop, UV_RUN_DEFAULT);
return 0;
}
This code is working and it creates the file and append the "Server Started!\n" String. But the problem is when I try to write to the file from different place in the code.
For example: where I try to print the http request buffer ig getting exception in:
libuv_httpparser_ws.exe!uv__get_osfhandle(int fd) Line 174 C in file : handle-inl.h
Code:
void after_read(uv_stream_t* handle, ssize_t nread, const uv_buf_t * buf) {
if (nread < 0) {
if (buf->base) {
free(buf->base);
}
uv_close((uv_handle_t*)handle, on_close);
return;
}
if (nread == 0) {
free(buf->base);
return;
}
_context* ctx = handle->data;
if (ctx->request->handshake == 0) {
//here you getting the request from the client
printf("buf->base %s\n", buf->base);
uv_fs_write(loop, &write_req, resultFD, buf->base, sizeof(buf->base), -1, write_cb); //<---HERE I TRY TO WRITE TO THE FILE WITHOUT SUCCESS
size_t np = http_parser_execute(ctx->parser, &settings, buf->base, nread);
int _http_errno =ctx->parser->http_errno;
const char * _errno = http_errno_description((enum http_errno)_http_errno);
int _upgrade = ctx->parser->upgrade;
free(buf->base);
if (np != nread) {
uv_shutdown_t* req;
req = (uv_shutdown_t*)malloc(sizeof *req);
uv_shutdown(req, handle, after_shutdown);
}
}
}
What am I doing wrong and how to make proper simple logger?
