feat: add context information to requests

Makefile

@@ -48,7 +48,7 @@ objs: $(OBJS)
 .PHONY: bin
 bin: $(BIN)
 $(BIN): $(OBJS)
-	$(CC) $(INTERNALCFLAGS) -o $@ $^
+	$(CC) $(INTERNALCFLAGS) $(LDFLAGS) -o $@ $^
 
 $(BUILD_DIR)/$(SRC_DIR)/%.c.o: $(SRC_DIR)/%.c
 	mkdir -p $(dir $@)

include/event_loop.h

@@ -6,36 +6,35 @@
 #include <stdlib.h>
 
 #include "http_req.h"
+#include "trie.h"
 
 // Size of the read and write buffers for each connection, in bytes
 #define EVENT_LOOP_BUFFER_SIZE 1024
 
+typedef struct event_loop_gctx {
+  Trie *trie;
+} event_loop_gctx;
+
+event_loop_gctx *event_loop_gctx_init();
+
+typedef struct event_loop_ctx {
+  http_request req;
+  event_loop_gctx *g;
+} event_loop_ctx;
+
+event_loop_ctx *event_loop_ctx_init(event_loop_gctx *g);
+
+void event_loop_ctx_free(event_loop_ctx *ctx);
+
 /**
  * Represents an active connection managed by the event loop
  */
-typedef struct event_loop_conn event_loop_conn;
-
 typedef enum {
   event_loop_conn_state_req = 0,
   event_loop_conn_state_res = 1,
   event_loop_conn_state_end = 2,
 } event_loop_conn_state;
 
-/*
- * Main struct object representing the event loop
- */
-typedef struct event_loop event_loop;
-
-/*
- * Initialize a new event loop
- */
-event_loop *event_loop_init();
-
-/*
- * Run the event loop. This function never returns.
- */
-void event_loop_run(event_loop *el, int port);
-
 typedef struct event_loop_conn {
   int fd;
   event_loop_conn_state state;
@@ -51,24 +50,34 @@ typedef struct event_loop_conn {
   // 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_ctx *ctx;
-  http_request req;
 } event_loop_conn;
 
 /*
  * Initialize a new event_loop_conn struct
  */
-event_loop_conn *event_loop_conn_init();
+event_loop_conn *event_loop_conn_init(event_loop_gctx *g);
 
+void event_loop_conn_free(event_loop_conn *conn);
+
+/*
+ * Process data on a connection
+ */
+void event_loop_conn_io(event_loop_conn *conn);
+
+/*
+ * Main struct object representing the event loop
+ */
 typedef struct event_loop {
   event_loop_conn **connections;
   size_t connection_count;
+  event_loop_gctx *gctx;
 } event_loop;
 
 /*
  * Initialize a new event_loop struct
  */
-event_loop *event_loop_init();
+event_loop *event_loop_init(event_loop_gctx *g);
 
 /*
  * Place a new connection into the event loop's internal array.
@@ -82,6 +91,9 @@ int event_loop_put(event_loop *loop, event_loop_conn *conn);
  */
 int event_loop_accept(event_loop *loop, int fd);
 
-void event_loop_conn_io(event_loop_conn *conn);
+/*
+ * Run the event loop. This function never returns.
+ */
+void event_loop_run(event_loop *el, int port);
 
 #endif

src/event_loop/event_loop.c

@@ -12,7 +12,6 @@
 
 #include "event_loop.h"
 #include "log.h"
-#include "picohttpparser.h"
 
 static int event_loop_fd_set_nb(int fd) {
   int flags = fcntl(fd, F_GETFL);
@@ -24,12 +23,13 @@ static int event_loop_fd_set_nb(int fd) {
   return 0;
 }
 
-event_loop *event_loop_init() {
+event_loop *event_loop_init(event_loop_gctx *gctx) {
   event_loop *el = calloc(sizeof(event_loop), 1);
 
   // No idea if this is a good starter value
   el->connections = calloc(sizeof(event_loop_conn), 16);
   el->connection_count = 16;
+  el->gctx = gctx;
 
   return el;
 }
@@ -52,7 +52,7 @@ int event_loop_put(event_loop *el, event_loop_conn *conn) {
   return 0;
 }
 
-int event_loop_accept(event_loop *loop, int fd) {
+int event_loop_accept(event_loop *el, int fd) {
   struct sockaddr_in client_addr;
   socklen_t socklen = sizeof(client_addr);
   int connfd = accept(fd, (struct sockaddr *)&client_addr, &socklen);
@@ -71,7 +71,7 @@ int event_loop_accept(event_loop *loop, int fd) {
   }
 
   // creating the struct Conn
-  event_loop_conn *conn = calloc(sizeof(event_loop_conn), 1);
+  event_loop_conn *conn = event_loop_conn_init(el->gctx);
 
   // Close the connectoin if we fail to allocate a connection struct
   if (conn == NULL) {
@@ -83,7 +83,7 @@ int event_loop_accept(event_loop *loop, int fd) {
   conn->fd = connfd;
   conn->state = event_loop_conn_state_req;
 
-  res = event_loop_put(loop, conn);
+  res = event_loop_put(el, conn);
 
   if (res != 0) {
     close(connfd);
@@ -190,7 +190,7 @@ void event_loop_run(event_loop *el, int port) {
           el->connections[conn->fd] = NULL;
 
           close(conn->fd);
-          free(conn);
+          event_loop_conn_free(conn);
         }
       }
     }

src/event_loop/event_loop_conn.c

@@ -1,165 +1,28 @@
-#include <errno.h>
-#include <fcntl.h>
-#include <netinet/in.h>
-#include <poll.h>
-#include <stdbool.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/socket.h>
-#include <unistd.h>
-
-#include "picohttpparser.h"
-
 #include "event_loop.h"
-#include "http.h"
 
-void event_loop_conn_io_res(event_loop_conn *conn) {
+event_loop_gctx *event_loop_gctx_init() {
-  while (1) {
+  event_loop_gctx *gctx = calloc(sizeof(event_loop_gctx), 1);
-    ssize_t res = 0;
-    size_t remain = conn->wbuf_size - conn->wbuf_sent;
 
-    do {
+  return gctx;
-      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;
 }
 
-    // If it's not EGAIN, there was an error writing so we simply end the
+event_loop_ctx *event_loop_ctx_init(event_loop_gctx *g) {
-    // request
+  event_loop_ctx *ctx = calloc(sizeof(event_loop_ctx), 1);
-    if (res < 0) {
+  ctx->g = g;
-      conn->state = event_loop_conn_state_end;
+
-      return;
+  return ctx;
 }
 
-    conn->wbuf_sent += (size_t)res;
+void event_loop_ctx_free(event_loop_ctx *ctx) { free(ctx); }
 
-    // After writing a response, we switch back to request mode to process a
+event_loop_conn *event_loop_conn_init(event_loop_gctx *g) {
-    // next request
+  event_loop_conn *conn = calloc(sizeof(event_loop_conn), 1);
-    if (conn->wbuf_sent == conn->wbuf_size) {
+  conn->ctx = event_loop_ctx_init(g);
-      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;
+  return conn;
-    }
-  }
 }
 
-bool event_loop_handle_request(event_loop_conn *conn) {
+void event_loop_conn_free(event_loop_conn *conn) {
-  // Prevents the request handler function from looping indefinitely without
+  event_loop_ctx_free(conn->ctx);
-  // ever consuming new data
+  free(conn);
-  if (conn->rbuf_size - conn->rbuf_read == 0) {
-    return false;
-  }
-
-  http_parse_error res =
-      http_parse_request(&conn->req, (const char *)&conn->rbuf[conn->rbuf_read],
-                         conn->rbuf_size - conn->rbuf_read);
-
-  if (res == http_parse_error_ok) {
-    conn->rbuf_read += conn->req.len;
-
-    memcpy(conn->wbuf, http_404, http_404_len);
-
-    conn->state = event_loop_conn_state_res;
-    conn->wbuf_size = http_404_len;
-    conn->wbuf_sent = 0;
-
-    /* event_loop_conn_io_res(conn); */
-
-  }
-  // 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;
-}
-
-/**
- * Read new data into the read buffer. This command performs at most one
- * successful read syscall.
- *
- * Returns whether the function should be retried immediately or not.
- */
-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);
-    conn->rbuf_size -= conn->rbuf_read;
-    conn->rbuf_read = 0;
-
-    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);
-
-    // 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;
-
-      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;
-
-      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; */
-    /* } */
-
-    conn->rbuf_size += (size_t)res;
-
-    // This loop allows processing multiple requests from a single read buffer
-    while (event_loop_handle_request(conn))
-      ;
-  }
-  // We can keep reading as long as we're in request mode
-  while (conn->state == event_loop_conn_state_req);
-}
-
-void event_loop_conn_io(event_loop_conn *conn) {
-  switch (conn->state) {
-  case event_loop_conn_state_req:
-    event_loop_conn_io_req(conn);
-    break;
-  case event_loop_conn_state_res:
-    event_loop_conn_io_res(conn);
-    break;
-  case event_loop_conn_state_end:
-    printf("we shouldn't be here\n");
-    break;
-  }
 }

src/event_loop/event_loop_io.c

@@ -0,0 +1,157 @@
+#include <errno.h>
+#include <fcntl.h>
+#include <netinet/in.h>
+#include <poll.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+#include "picohttpparser.h"
+
+#include "event_loop.h"
+#include "http.h"
+
+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;
+
+    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;
+    }
+
+    // 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;
+    }
+  }
+}
+
+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 - conn->rbuf_read == 0) {
+    return false;
+  }
+
+  http_parse_error res = http_parse_request(
+      &conn->ctx->req, (const char *)&conn->rbuf[conn->rbuf_read],
+      conn->rbuf_size - conn->rbuf_read);
+
+  if (res == http_parse_error_ok) {
+    // Perform the request
+    http_route(conn);
+  }
+  // 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;
+}
+
+/**
+ * Read new data into the read buffer. This command performs at most one
+ * successful read syscall.
+ *
+ * Returns whether the function should be retried immediately or not.
+ */
+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);
+    conn->rbuf_size -= conn->rbuf_read;
+    conn->rbuf_read = 0;
+
+    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);
+
+    // 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;
+
+      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;
+
+      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; */
+    /* } */
+
+    conn->rbuf_size += (size_t)res;
+
+    // This loop allows processing multiple requests from a single read buffer
+    while (event_loop_handle_request(conn))
+      ;
+  }
+  // We can keep reading as long as we're in request mode
+  while (conn->state == event_loop_conn_state_req);
+}
+
+void event_loop_conn_io(event_loop_conn *conn) {
+  switch (conn->state) {
+  case event_loop_conn_state_req:
+    event_loop_conn_io_req(conn);
+    break;
+  case event_loop_conn_state_res:
+    event_loop_conn_io_res(conn);
+    break;
+  case event_loop_conn_state_end:
+    printf("we shouldn't be here\n");
+    break;
+  }
+}

src/http/http_route.c

@@ -1,5 +1,17 @@
+#include <string.h>
+
 #include "event_loop.h"
+#include "http.h"
 
 typedef void (*routing_func)(event_loop_conn *);
 
-routing_func http_route();
+void http_route(event_loop_conn *conn) {
+  // TODO routing
+
+  // Fallthrough is to return a 404
+  memcpy(conn->wbuf, http_404, http_404_len);
+
+  conn->state = event_loop_conn_state_res;
+  conn->wbuf_size = http_404_len;
+  conn->wbuf_sent = 0;
+}

src/main.c

@@ -1,11 +1,25 @@
 #include <stdio.h>
 
 #include "event_loop.h"
+#include "log.h"
 
 int main() {
   setvbuf(stdout, NULL, _IONBF, 0);
 
-  event_loop *el = event_loop_init();
+  info("Initializing trie");
+
+  Trie *trie = trie_init();
+  int count = trie_populate(trie, "lander.data");
+
+  if (count < 0) {
+    critical(1, "An error occured while populating the trie.");
+  }
+
+  info("Trie initialized and populated with %i entries", count);
+
+  event_loop_gctx *gctx = event_loop_gctx_init();
+  gctx->trie = trie;
+  event_loop *el = event_loop_init(gctx);
 
   event_loop_run(el, 8000);
 }