refactor: make code a bit cleaner n stuff

src/event_loop/event_loop_conn.c

@@ -14,47 +14,46 @@
 
 #include "event_loop_internal.h"
 
-const char http_200_ok[] = "HTTP/1.1 200 OK\nContent-Length: 5\n\nhello";
+void event_loop_conn_io_res(event_loop_conn *conn) {
+  while (1) {
+    ssize_t res = 0;
+    size_t remain = conn->wbuf_size - conn->wbuf_sent;
 
-bool event_loop_conn_io_res(event_loop_conn *conn) {
-  ssize_t res = 0;
-  size_t remain = conn->wbuf_size - conn->wbuf_sent;
+    do {
+      res = write(conn->fd, &conn->wbuf[conn->wbuf_sent], remain);
+    } while (res < 0 && errno == EINTR);
 
-  do {
-    res = write(conn->fd, &conn->wbuf[conn->wbuf_sent], remain);
-  } while (res < 0 && errno == EINTR);
+    // EAGAIN doesn't mean there was an error, but rather that there's no more
+    // data right now, but there might be more later, aka "try again later"
+    if (res < 0 && errno == EAGAIN) {
+      return;
+    }
 
-  // EAGAIN doesn't mean there was an error, but rather that there's no more
-  // data right now, but there might be more later, aka "try again later"
-  if (res < 0 && errno == EAGAIN) {
-    return false;
+    // If it's not EGAIN, there was an error writing so we simply end the
+    // request
+    if (res < 0) {
+      conn->state = event_loop_conn_state_end;
+      return;
+    }
+
+    conn->wbuf_sent += (size_t)res;
+
+    // After writing a response, we switch back to request mode to process a
+    // next request
+    if (conn->wbuf_sent == conn->wbuf_size) {
+      conn->state = conn->close_after_write ? event_loop_conn_state_end
+                                            : event_loop_conn_state_req;
+      /* c->wbuf_sent = 0; */
+      /* c->wbuf_size = 0; */
+
+      return;
+    }
   }
-
-  // If it's not EGAIN, there was an error writing so we simply end the request
-  if (res < 0) {
-    conn->state = event_loop_conn_state_end;
-    return false;
-  }
-
-  conn->wbuf_sent += (size_t)res;
-
-  // After writing a response, we switch back to request mode to process a next
-  // request
-  if (conn->wbuf_sent == conn->wbuf_size) {
-    conn->state = conn->close_after_write ? event_loop_conn_state_end
-                                          : event_loop_conn_state_req;
-    /* c->wbuf_sent = 0; */
-    /* c->wbuf_size = 0; */
-
-    return false;
-  }
-
-  // still got some data in wbuf, could try to write again
-  return true;
 }
 
-bool try_one_request(event_loop_conn *conn) {
-  // We definitely can't do anything with zero bytes.
+bool event_loop_handle_request(event_loop_conn *conn) {
+  // Prevents the request handler function from looping indefinitely without
+  // ever consuming new data
   if (conn->rbuf_size == 0) {
     return false;
   }
@@ -117,76 +116,68 @@ bool try_one_request(event_loop_conn *conn) {
  *
  * Returns whether the function should be retried immediately or not.
  */
-bool event_loop_conn_io_req(event_loop_conn *conn) {
-  ssize_t res;
-  size_t cap = EVENT_LOOP_BUFFER_SIZE - conn->rbuf_size;
+void event_loop_conn_io_req(event_loop_conn *conn) {
+  while (1) {
+    ssize_t res;
+    size_t cap = EVENT_LOOP_BUFFER_SIZE - conn->rbuf_size;
 
-  // Try to read at most cap bytes from the file descriptor
-  do {
-    res = read(conn->fd, &conn->rbuf[conn->rbuf_size], cap);
-  } while (res < 0 && errno == EINTR);
+    // Try to read at most cap bytes from the file descriptor
+    do {
+      res = read(conn->fd, &conn->rbuf[conn->rbuf_size], cap);
+    } while (res < 0 && errno == EINTR);
 
-  // EGAIN means we try again later
-  if (res < 0 && errno == EAGAIN) {
-    return false;
-  }
+    // EGAIN means we try again later
+    if (res < 0 && errno == EAGAIN) {
+      return;
+    }
 
-  // Any other negative error message means the read errored out
-  if (res < 0) {
-    conn->state = event_loop_conn_state_end;
+    // Any other negative error message means the read errored out
+    if (res < 0) {
+      conn->state = event_loop_conn_state_end;
 
-    return false;
-  }
+      return;
+    }
 
-  // Output of 0 and no error means we've reached the end of the input. We run
-  // try_one_request one more time and close the connection if this doesn't
-  // change the result.
-  if (res == 0) {
-    conn->state = event_loop_conn_state_end;
+    // Output of 0 and no error means we've reached the end of the input. We run
+    // try_one_request one more time and close the connection if this doesn't
+    // change the result.
+    if (res == 0) {
+      conn->state = event_loop_conn_state_end;
 
-    return false;
-  }
+      return;
+    }
 
-  // We switch to processing mode if we've reached the end of the data stream,
-  // or if the read buffer is filled
-  /* if (res == 0 || c->rbuf_size == MAX_MSG_SIZE) { */
-  /*     c->state = STATE_PROCESS; */
-  /*     return false; */
-  /* } */
+    // We switch to processing mode if we've reached the end of the data stream,
+    // or if the read buffer is filled
+    /* if (res == 0 || c->rbuf_size == MAX_MSG_SIZE) { */
+    /*     c->state = STATE_PROCESS; */
+    /*     return false; */
+    /* } */
 
-  conn->rbuf_size += (size_t)res;
+    conn->rbuf_size += (size_t)res;
 
-  /* assert(conn->rbuf_size <= sizeof(conn->rbuf)); */
+    /* assert(conn->rbuf_size <= sizeof(conn->rbuf)); */
 
-  // Try to process requests one by one.
-  // Try to process requests one by one.
-  // Why is there a loop? Please read the explanation of "pipelining".
-  while (try_one_request(conn)) {
-  };
+    // Try to process requests one by one.
+    // Try to process requests one by one.
+    // Why is there a loop? Please read the explanation of "pipelining".
+    while (event_loop_handle_request(conn)) {
+    };
 
-  // We can keep reading as long as we're in request mode
-  return conn->state == event_loop_conn_state_req;
-  /* while (try_one_request(conn)) {} */
-  /* return (conn->state == STATE_REQ); */
-}
-
-void conn_state_res(event_loop_conn *conn) {
-  while (event_loop_conn_io_res(conn)) {
-  }
-}
-
-void conn_state_req(event_loop_conn *conn) {
-  while (event_loop_conn_io_req(conn)) {
+    // We can keep reading as long as we're in request mode
+    if (conn->state != event_loop_conn_state_req) {
+      return;
+    };
   }
 }
 
 void event_loop_conn_io(event_loop_conn *conn) {
   switch (conn->state) {
   case event_loop_conn_state_req:
-    conn_state_req(conn);
+    event_loop_conn_io_req(conn);
     break;
   case event_loop_conn_state_res:
-    conn_state_res(conn);
+    event_loop_conn_io_res(conn);
     break;
   case event_loop_conn_state_end:
     printf("we shouldn't be here\n");

src/event_loop/event_loop_consts.c

@@ -0,0 +1,11 @@
+#include <stdlib.h>
+
+const char http_404[] = "HTTP/1.1 404 Not Found\n"
+                        "Connection: close\n"
+                        "Content-Length: 0\n\n";
+const size_t http_404_len = sizeof(http_404) - 1;
+
+const char http_500[] = "HTTP/1.1 500 Internal Server Error\n"
+                        "Connection: close\n"
+                        "Content-Length: 0\n\n";
+const size_t http_500_len = sizeof(http_500) - 1;

src/event_loop/event_loop_internal.h

@@ -53,4 +53,9 @@ int event_loop_accept(event_loop *loop, int fd);
 
 void event_loop_conn_io(event_loop_conn *conn);
 
+extern const char http_404[];
+extern const size_t http_404_len;
+extern const char http_500[];
+extern const size_t http_500_len;
+
 #endif