feat: inching our way towards http routing

include/event_loop.h

@@ -1,6 +1,12 @@
 #ifndef LANDER_EVENT_LOOP
 #define LANDER_EVENT_LOOP
 
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "http_req.h"
+
 // Size of the read and write buffers for each connection, in bytes
 #define EVENT_LOOP_BUFFER_SIZE 1024
 
@@ -30,4 +36,52 @@ event_loop *event_loop_init();
  */
 void event_loop_run(event_loop *el, int port);
 
+typedef struct event_loop_conn {
+  int fd;
+  event_loop_conn_state state;
+  // buffer for reading
+  size_t rbuf_size;
+  size_t rbuf_read;
+  uint8_t rbuf[EVENT_LOOP_BUFFER_SIZE];
+  // buffer for writing
+  size_t wbuf_size;
+  size_t wbuf_sent;
+  uint8_t wbuf[EVENT_LOOP_BUFFER_SIZE];
+
+  // If true, the server will close the connection after the final write buffer
+  // has been written
+  bool close_after_write;
+  /* void (*process_func)(struct event_loop_conn *); */
+  http_request req;
+} event_loop_conn;
+
+/*
+ * Initialize a new event_loop_conn struct
+ */
+event_loop_conn *event_loop_conn_init();
+
+typedef struct event_loop {
+  event_loop_conn **connections;
+  size_t connection_count;
+} event_loop;
+
+/*
+ * Initialize a new event_loop struct
+ */
+event_loop *event_loop_init();
+
+/*
+ * Place a new connection into the event loop's internal array.
+ *
+ * Returns -1 if the internal realloc failed
+ */
+int event_loop_put(event_loop *loop, event_loop_conn *conn);
+
+/**
+ * Accept a new connection for the given file descriptor.
+ */
+int event_loop_accept(event_loop *loop, int fd);
+
+void event_loop_conn_io(event_loop_conn *conn);
+
 #endif

include/http.h

@@ -3,31 +3,16 @@
 
 #include <stdlib.h>
 
+#include "picohttpparser.h"
+
+#include "event_loop.h"
+#include "http_req.h"
+
 extern const char http_404[];
 extern const size_t http_404_len;
 extern const char http_500[];
 extern const size_t http_500_len;
 
-typedef enum http_request_entity {
-  event_loop_request_type_unknown = 0
-} http_request_entity;
-
-typedef enum http_request_method {
-  http_request_method_get = 0,
-  http_request_method_post = 1,
-  http_request_method_put = 2,
-  http_request_method_patch = 3,
-  http_request_method_delete = 4
-} http_request_method;
-
-/*
- * Struct representing the specific type of request
- */
-typedef struct http_request {
-  http_request_method type;
-  http_request_entity entity;
-} http_request;
-
 typedef enum http_parse_error {
   http_parse_error_ok = 0,
   http_parse_error_incomplete = 1,
@@ -37,4 +22,6 @@ typedef enum http_parse_error {
 http_parse_error http_parse_request(http_request *req, const char *path,
                                     size_t path_len);
 
+void http_route(event_loop_conn *conn);
+
 #endif

include/http_req.h

@@ -0,0 +1,31 @@
+#ifndef HTTP_REQ
+#define HTTP_REQ
+
+#include <stdlib.h>
+
+#include "picohttpparser.h"
+
+#define HTTP_MAX_ALLOWED_HEADERS 16
+
+typedef enum http_request_method {
+  http_request_method_get = 0,
+  http_request_method_post = 1,
+  http_request_method_put = 2,
+  http_request_method_patch = 3,
+  http_request_method_delete = 4
+} http_request_method;
+
+/*
+ * Struct representing the specific type of request
+ */
+typedef struct http_request {
+  size_t len;
+  int minor_version;
+  const char *method;
+  size_t method_len;
+  const char *path;
+  size_t path_len;
+  struct phr_header headers[HTTP_MAX_ALLOWED_HEADERS];
+} http_request;
+
+#endif

src/event_loop/event_loop.c

@@ -10,7 +10,7 @@
 #include <sys/socket.h>
 #include <unistd.h>
 
-#include "event_loop_internal.h"
+#include "event_loop.h"
 #include "log.h"
 #include "picohttpparser.h"
 

src/event_loop/event_loop_conn.c

@@ -11,9 +11,9 @@
 #include <unistd.h>
 
 #include "picohttpparser.h"
-#include "http.h"
 
-#include "event_loop_internal.h"
+#include "event_loop.h"
+#include "http.h"
 
 void event_loop_conn_io_res(event_loop_conn *conn) {
   while (1) {
@@ -59,58 +59,34 @@ bool event_loop_handle_request(event_loop_conn *conn) {
     return false;
   }
 
-  /* if (conn->process_func != NULL) { */
-  /*   conn->process_func(conn); */
-  /* } */
+  http_parse_error res =
+      http_parse_request(&conn->req, (const char *)&conn->rbuf[conn->rbuf_read],
+                         conn->rbuf_size - conn->rbuf_read);
 
-  const char *method, *path;
-  struct phr_header headers[16];
-  size_t method_len, path_len, num_headers;
-  int minor_version;
-
-  num_headers = sizeof(headers) / sizeof(headers[0]);
-
-  int res = phr_parse_request((const char *)&conn->rbuf[conn->rbuf_read], conn->rbuf_size - conn->rbuf_read,
-                              &method, &method_len, &path, &path_len,
-                              &minor_version, headers, &num_headers, 0);
-
-  if (res > 0) {
-    /* for (size_t i = 0; i < num_headers; i++) { */
-    /*   /1* printf("%.*s: ", headers[i].name_len, headers[i].name); *1/ */
-    /*   /1* printf("%.*s\n", headers[i].value_len, headers[i].value); *1/ */
-    /*   if (strncmp("Connection", headers[i].name, headers[i].name_len) == 0) {
-     */
-    /*     if (strncmp("close", headers[i].value, headers[i].value_len) == 0) {
-     */
-    /*       conn->close_after_write = true; */
-    /*       break; */
-    /*     } */
-    /*   } */
-    /* } */
-
-    // Advance the read buffer
-    conn->rbuf_read += res;
+  if (res == http_parse_error_ok) {
+    conn->rbuf_read += conn->req.len;
 
     memcpy(conn->wbuf, http_404, http_404_len);
 
-    // Move the new request up to the front of the read buffer
-    /* memmove(conn->rbuf, &conn->rbuf[res], conn->rbuf_size - res); */
-    /* conn->rbuf_size -= res; */
-
     conn->state = event_loop_conn_state_res;
     conn->wbuf_size = http_404_len;
     conn->wbuf_sent = 0;
 
-    event_loop_conn_io_res(conn);
+    /* event_loop_conn_io_res(conn); */
 
-    /* // End the connection if the http request is invalid, or when the
-     * response */
-    /* // is too large to fit into a single read buffer */
-  } else if (res == -1 ||
-             (res == -2 && conn->rbuf_size == EVENT_LOOP_BUFFER_SIZE)) {
+  }
+  // Both in the case of an invalid HTTP request or one that's larger than the
+  // read buffer, we cannot determine when the next, possibly valid, HTTP
+  // request begins in the data stream. Therefore, we close the connection,
+  // even if additional pipelined requests are incoming.
+  else if (res == http_parse_error_invalid ||
+           (res == http_parse_error_incomplete &&
+            conn->rbuf_size == EVENT_LOOP_BUFFER_SIZE)) {
     conn->state = event_loop_conn_state_end;
   }
 
+  // TODO in highly concurrent situations, it might actually be better to always
+  // return false here, as this allows cycling better through all connections
   return conn->state == event_loop_conn_state_req;
 }
 
@@ -123,7 +99,8 @@ bool event_loop_handle_request(event_loop_conn *conn) {
 void event_loop_conn_io_req(event_loop_conn *conn) {
   do {
     // Move remaining data to start of buffer
-    memmove(conn->rbuf, &conn->rbuf[conn->rbuf_read], conn->rbuf_size - conn->rbuf_read);
+    memmove(conn->rbuf, &conn->rbuf[conn->rbuf_read],
+            conn->rbuf_size - conn->rbuf_read);
     conn->rbuf_size -= conn->rbuf_read;
     conn->rbuf_read = 0;
 

src/event_loop/event_loop_internal.h

@@ -1,57 +0,0 @@
-#ifndef LANDER_EVENT_LOOP_INTERNAL
-#define LANDER_EVENT_LOOP_INTERNAL
-
-#include <stdbool.h>
-#include <stdint.h>
-#include <stdlib.h>
-
-#include "event_loop.h"
-
-typedef struct event_loop_conn {
-  int fd;
-  event_loop_conn_state state;
-  // buffer for reading
-  size_t rbuf_size;
-  size_t rbuf_read;
-  uint8_t rbuf[EVENT_LOOP_BUFFER_SIZE];
-  // buffer for writing
-  size_t wbuf_size;
-  size_t wbuf_sent;
-  uint8_t wbuf[EVENT_LOOP_BUFFER_SIZE];
-
-  // If true, the server will close the connection after the final write buffer
-  // has been written
-  bool close_after_write;
-  /* void (*process_func)(struct event_loop_conn *); */
-} event_loop_conn;
-
-/*
- * Initialize a new event_loop_conn struct
- */
-event_loop_conn *event_loop_conn_init();
-
-typedef struct event_loop {
-  event_loop_conn **connections;
-  size_t connection_count;
-} event_loop;
-
-/*
- * Initialize a new event_loop struct
- */
-event_loop *event_loop_init();
-
-/*
- * Place a new connection into the event loop's internal array.
- *
- * Returns -1 if the internal realloc failed
- */
-int event_loop_put(event_loop *loop, event_loop_conn *conn);
-
-/**
- * Accept a new connection for the given file descriptor.
- */
-int event_loop_accept(event_loop *loop, int fd);
-
-void event_loop_conn_io(event_loop_conn *conn);
-
-#endif

src/http/http_parse.c

@@ -7,25 +7,19 @@
 http_parse_error http_parse_request(http_request *req, const char *buf,
                                     size_t buf_size) {
   // First we try to parse the incoming HTTP request
-  const char *method, *path;
-  struct phr_header headers[16];
-  size_t method_len, path_len, num_headers;
-  int minor_version;
+  size_t num_headers = HTTP_MAX_ALLOWED_HEADERS;
 
-  int res =
-      phr_parse_request(buf, buf_size, &method, &method_len, &path, &path_len,
-                        &minor_version, headers, &num_headers, 0);
+  int res = phr_parse_request(buf, buf_size, &req->method, &req->method_len,
+                              &req->path, &req->path_len, &req->minor_version,
+                              req->headers, &num_headers, 0);
 
-  if (res == -2) {
+  if (res == -1) {
+    return http_parse_error_invalid;
+  } else if (res == -2) {
     return http_parse_error_incomplete;
-  } else if (res < 0) {
-    return http_parse_error_invalid;
   }
 
-  // Next, we parse the HTTP request as a lander-specific request
-  if (path_len == 0 || path[0] != '/') {
-    return http_parse_error_invalid;
-  }
+  req->len = res;
 
   return http_parse_error_ok;
 }

src/http/http_route.c

@@ -0,0 +1,5 @@
+#include "event_loop.h"
+
+typedef void (*routing_func)(event_loop_conn *);
+
+routing_func http_route();