feat: support serving files

include/http.h

@@ -126,12 +126,18 @@ typedef struct http_response_header {
   bool owned;
 } http_response_header;
 
+typedef enum http_response_body_type {
+  http_response_body_buf = 0,
+  http_response_body_file = 1
+} http_response_body_type;
+
 typedef struct http_response {
   http_response_type type;
   const char *head;
   size_t head_len;
   size_t head_written;
-  const char *body;
+  http_response_body_type body_type;
+  void *body;
   size_t body_len;
   size_t body_written;
   // If false, the body won't be freed

include/http_loop.h

@@ -94,8 +94,10 @@ void http_loop_process_request(event_loop_conn *conn);
  * Set the request body to the given buffer. If owned is set to true, the body
  * buffer will be free'd after the request has finished.
  */
-void http_loop_res_set_body(http_loop_ctx *ctx, const char *body,
-                            size_t body_len, bool owned);
+void http_loop_res_set_body_buf(http_loop_ctx *ctx, const char *body,
+                                size_t body_len, bool owned);
+
+void http_loop_res_set_body_file(http_loop_ctx *ctx, const char *filename);
 
 void http_loop_res_add_header(http_loop_ctx *ctx, http_header type,
                               const char *value, bool owned);

src/http_loop/http_loop_ctx.c

@@ -1,3 +1,5 @@
+#include <stdio.h>
+
 #include "http.h"
 #include "http_loop.h"
 
@@ -29,10 +31,16 @@ void http_loop_ctx_reset(http_loop_ctx *ctx) {
     ctx->res.head = NULL;
   }
 
-  if (ctx->res.owns_body && ctx->res.body != NULL) {
-    free((void *)ctx->res.body);
+  if (ctx->res.body != NULL) {
+    if (ctx->res.body_type == http_response_body_buf && ctx->res.owns_body) {
+      free((void *)ctx->res.body);
+    } else if (ctx->res.body_type == http_response_body_file) {
+      fclose(ctx->res.body);
+    }
   }
 
+  ctx->res.body = NULL;
+
   for (size_t i = 0; i < ctx->res.header_count; i++) {
     if (ctx->res.headers[i].owned) {
       free((void *)ctx->res.headers[i].value);
@@ -41,8 +49,6 @@ void http_loop_ctx_reset(http_loop_ctx *ctx) {
 
   ctx->res.header_count = 0;
 
-  ctx->res.body = NULL;
-
   ctx->res.type = 0;
   ctx->res.head_len = 0;
   ctx->res.head_written = 0;

src/http_loop/http_loop_res.c

@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <sys/stat.h>
 
 #include "http_loop.h"
 #include "log.h"
@@ -82,21 +83,45 @@ void http_loop_write_response(event_loop_conn *conn) {
   if (res->body_written < res->body_len) {
     size_t bytes_to_write = MIN(res->body_len - res->body_written,
                                 EVENT_LOOP_BUFFER_SIZE - conn->wbuf_size);
-    memcpy(&conn->wbuf[conn->wbuf_size], &res->body[res->body_written],
-           bytes_to_write);
+    size_t bytes_written;
 
-    conn->wbuf_size += bytes_to_write;
-    res->body_written += bytes_to_write;
+    switch (res->body_type) {
+    case http_response_body_buf:
+      memcpy(&conn->wbuf[conn->wbuf_size], &res->body[res->body_written],
+             bytes_to_write);
+      conn->wbuf_size += bytes_to_write;
+      res->body_written += bytes_to_write;
+      break;
+    case http_response_body_file:
+      bytes_written = fread(&conn->wbuf[conn->wbuf_size], sizeof(uint8_t),
+                            bytes_to_write, res->body);
+      conn->wbuf_size += bytes_written;
+      res->body_written += bytes_written;
+      break;
+    }
   }
 }
 
-void http_loop_res_set_body(http_loop_ctx *ctx, const char *body,
-                            size_t body_len, bool owned) {
-  ctx->res.body = body;
+void http_loop_res_set_body_buf(http_loop_ctx *ctx, const char *body,
+                                size_t body_len, bool owned) {
+  ctx->res.body_type = http_response_body_buf;
+  ctx->res.body = (void *)body;
   ctx->res.body_len = body_len;
   ctx->res.owns_body = owned;
 }
 
+void http_loop_res_set_body_file(http_loop_ctx *ctx, const char *filename) {
+  struct stat st;
+  stat(filename, &st);
+
+  // TODO error handling
+  FILE *f = fopen(filename, "r");
+
+  ctx->res.body_type = http_response_body_file;
+  ctx->res.body = f;
+  ctx->res.body_len = st.st_size;
+}
+
 void http_loop_res_add_header(http_loop_ctx *ctx, http_header type,
                               const char *value, bool owned) {
   ctx->res.headers[ctx->res.header_count].type = type;

src/main.c

@@ -17,8 +17,7 @@ const char index_page[] =
 bool lander_get_index(event_loop_conn *conn) {
   http_loop_ctx *ctx = conn->ctx;
 
-  http_loop_res_set_body(ctx, index_page, sizeof(index_page) - 1, false);
-  http_loop_res_add_header(ctx, http_header_connection, "close", false);
+  http_loop_res_set_body_file(ctx, "Dockerfile");
 
   conn->state = event_loop_conn_state_res;