Abstract out chunk_queue code.

This moves the chunk handling code to separate functions cq_foo().  They
take pointers to a chunk queue, which makes them orthogonal to the rest of
http_send.c.

diff --git a/http_send.c b/http_send.c
index 2597066a2a329787ba713f4c48146818d7abd56a..65b6c5a2ebee3b518a5383acd45273ce696a629c 100644 (file)
--- a/http_send.c
+++ b/http_send.c
@@ -106,18 +106,96 @@ struct access_info {
 static int server_fd = -1, numclients;
 static struct sender *self;
 
-static void http_shutdown_client(struct http_client *hc, const char *msg)
+
+static int cq_enqueue(struct chunk_queue *cq, long unsigned chunk_num,
+       size_t sent)
+{
+       struct queued_chunk *qc;
+       char *buf;
+       size_t len;
+       int ret;
+
+       if (chunk_num != -1U) {
+               ret = vss_get_chunk(chunk_num, &buf, &len);
+               if (ret < 0)
+                       return ret;
+       } else
+               buf = vss_get_header(&len);
+       if (cq->num_pending + len > cq->max_pending)
+               return -E_QUEUE;
+       qc = para_malloc(sizeof(struct queued_chunk));
+       cq->num_pending += len;
+       qc->chunk_num = chunk_num;
+       qc->sent = sent;
+       list_add_tail(&qc->node, &cq->q);
+       PARA_DEBUG_LOG("%lu bytes queued for %p\n", cq->num_pending, &cq->q);
+       return 1;
+}
+
+static struct queued_chunk *cq_peek(struct chunk_queue *cq)
+{
+       if (list_empty(&cq->q))
+               return NULL;
+       return list_entry(cq->q.next, struct queued_chunk, node);
+}
+
+int cq_dequeue(struct chunk_queue *cq)
+{
+       struct queued_chunk *qc = cq_peek(cq);
+       assert(qc);
+       list_del(&qc->node);
+       free(qc);
+       return 1;
+}
+
+void cq_update(struct chunk_queue *cq, size_t sent)
+{
+       struct queued_chunk *qc = cq_peek(cq);
+       assert(qc);
+       qc->sent += sent;
+       cq->num_pending -= sent;
+}
+
+int cq_get(struct queued_chunk *qc, char **buf, size_t *len)
+{
+       int ret;
+
+       if (qc->chunk_num != -1U) {
+               ret = vss_get_chunk(qc->chunk_num, buf, len);
+               if (ret < 0)
+                       return ret;
+       } else
+               *buf = vss_get_header(len);
+       assert(*len > qc->sent);
+       *buf += qc->sent;
+       *len -= qc->sent;
+       return 1;
+}
+
+void cq_init(struct chunk_queue *cq, size_t max_pending)
+{
+       INIT_LIST_HEAD(&cq->q);
+       cq->max_pending = max_pending;
+       cq->num_pending = 0;
+}
+
+void cq_destroy(struct chunk_queue *cq)
 {
        struct queued_chunk *qc, *tmp;
+       list_for_each_entry_safe(qc, tmp, &cq->q, node) {
+               list_del(&qc->node);
+               free(qc);
+       }
+}
+
+static void http_shutdown_client(struct http_client *hc, const char *msg)
+{
        PARA_INFO_LOG("shutting down %s on fd %d (%s)\n", CLIENT_ADDR(hc),
                hc->fd, msg);
        numclients--;
        close(hc->fd);
        del_close_on_fork_list(hc->fd);
-       list_for_each_entry_safe(qc, tmp, &hc->cq.q, node) {
-               list_del(&qc->node);
-               free(qc);
-       }
+       cq_destroy(&hc->cq);
        list_del(&hc->node);
        free(hc);
 }
@@ -150,61 +228,24 @@ static int http_send_err_msg(struct http_client *hc)
        return http_send_msg(hc, HTTP_ERR_MSG);
 }
 
-static int enqueue_chunk(struct chunk_queue *cq, long unsigned chunk_num,
-       size_t sent)
-{
-       struct queued_chunk *qc;
-       char *buf;
-       size_t len;
-       int ret;
-
-       if (chunk_num != -1U) {
-               ret = vss_get_chunk(chunk_num, &buf, &len);
-               if (ret < 0)
-                       return ret;
-       } else
-               buf = vss_get_header(&len);
-       if (cq->num_pending + len > MAX_BACKLOG)
-               return -E_QUEUE;
-       qc = para_malloc(sizeof(struct queued_chunk));
-       cq->num_pending += len;
-       qc->chunk_num = chunk_num;
-       qc->sent = sent;
-       list_add_tail(&qc->node, &cq->q);
-       PARA_INFO_LOG("%lu bytes queued for q %p\n", cq->num_pending, &cq->q);
-       return 1;
-}
 
 static int send_queued_chunks(struct http_client *hc)
 {
-       int ret;
-       struct queued_chunk *qc, *tmp;
-
-       if (list_empty(&hc->cq.q))
-               return 1;
-       list_for_each_entry_safe(qc, tmp, &hc->cq.q, node) {
+       struct queued_chunk *qc;
+       while ((qc = cq_peek(&hc->cq))) {
                char *buf;
                size_t len;
-               ret = write_ok(hc->fd);
+               int ret = write_ok(hc->fd);
                if (ret <= 0)
                        return ret? -E_WRITE_OK : 0;
-               if (qc->chunk_num != -1U) {
-                       ret = vss_get_chunk(qc->chunk_num, &buf, &len);
-                       if (ret < 0)
-                               return ret;
-               } else
-                       buf = vss_get_header(&len);
-               assert(len && len > qc->sent);
-               ret = write(hc->fd, buf + qc->sent, len - qc->sent);
+               cq_get(qc, &buf, &len);
+               ret = write(hc->fd, buf, len);
                if (ret < 0)
                        return -1; /* FIXME */
-               hc->cq.num_pending -= ret;
-               if (ret != len - qc->sent) {
-                       qc->sent += ret;
-                       return 0;
-               }
-               list_del(&qc->node);
-               free(qc);
+               cq_update(&hc->cq, ret);
+               if (ret != len)
+                       return 1;
+               cq_dequeue(&hc->cq);
        }
        return 1;
 }
@@ -212,7 +253,7 @@ static int send_queued_chunks(struct http_client *hc)
 static int queue_chunk_or_shutdown(struct http_client *hc, long unsigned chunk_num,
        size_t sent)
 {
-       int ret = enqueue_chunk(&hc->cq, chunk_num, sent);
+       int ret = cq_enqueue(&hc->cq, chunk_num, sent);
        if (ret < 0)
                http_shutdown_client(hc, "queue error");
        return ret;
@@ -248,9 +289,6 @@ static void http_send( long unsigned current_chunk,
                if (!len)
                        continue;
                if (!ret || write_ok(hc->fd) <= 0) {
-                       PARA_INFO_LOG("fd %d not ready (%lu bytes queued),"
-                               " trying to queue chunk\n", hc->fd,
-                               hc->cq.num_pending);
                        queue_chunk_or_shutdown(hc, current_chunk, 0);
                        continue;
                }
@@ -342,7 +380,7 @@ static void http_post_select(fd_set *rfds, fd_set *wfds)
                goto err_out;
        }
        hc->status = HTTP_CONNECTED;
-       INIT_LIST_HEAD(&hc->cq.q);
+       cq_init(&hc->cq, MAX_BACKLOG);
        PARA_INFO_LOG("accepted client #%d: %s (fd %d)\n", numclients,
                CLIENT_ADDR(hc), hc->fd);
        numclients++;