# HG changeset patch
# User Maxim Dounin <mdounin@mdounin.ru>
# Date 1316113247 0
# Node ID b66712cde67d3d7aaac61252df24336f3773f0f1
# Parent  dbddec65fdab46e3d97a3fa0f84b4e8ede67b2b5
Upstream: pipe length and input_filter_init in buffered mode.

As long as ngx_event_pipe() has more data read from upstream than specified
in p->length it's passed to input filter even if buffer isn't yet full.  This
allows to process data with known length without relying on connection close
to signal data end.

By default p->length is set to -1 in upstream module, i.e. end of data is
indicated by connection close.  To set it from per-protocol handlers upstream
input_filter_init() now called in buffered mode (as well as in
unbuffered mode).

diff --git a/src/event/ngx_event_pipe.c b/src/event/ngx_event_pipe.c
--- a/src/event/ngx_event_pipe.c
+++ b/src/event/ngx_event_pipe.c
@@ -392,8 +392,31 @@ ngx_event_pipe_read_upstream(ngx_event_p
                        cl->buf->file_last - cl->buf->file_pos);
     }
 
+    ngx_log_debug1(NGX_LOG_DEBUG_EVENT, p->log, 0,
+                   "pipe length: %O", p->length);
+
 #endif
 
+    if (p->free_raw_bufs && p->length != -1) {
+        cl = p->free_raw_bufs;
+
+        if (cl->buf->last - cl->buf->pos >= p->length) {
+
+            /* STUB */ cl->buf->num = p->num++;
+
+            if (p->input_filter(p, cl->buf) == NGX_ERROR) {
+                 return NGX_ABORT;
+            }
+
+            p->free_raw_bufs = cl->next;
+        }
+    }
+
+    if (p->length == 0) {
+        p->upstream_done = 1;
+        p->read = 1;
+    }
+
     if ((p->upstream_eof || p->upstream_error) && p->free_raw_bufs) {
 
         /* STUB */ p->free_raw_bufs->buf->num = p->num++;
@@ -848,6 +871,12 @@ ngx_event_pipe_copy_input_filter(ngx_eve
     }
     p->last_in = &cl->next;
 
+    if (p->length == -1) {
+        return NGX_OK;
+    }
+
+    p->length -= b->last - b->pos;
+
     return NGX_OK;
 }
 
diff --git a/src/event/ngx_event_pipe.h b/src/event/ngx_event_pipe.h
--- a/src/event/ngx_event_pipe.h
+++ b/src/event/ngx_event_pipe.h
@@ -65,6 +65,7 @@ struct ngx_event_pipe_s {
     ssize_t            busy_size;
 
     off_t              read_length;
+    off_t              length;
 
     off_t              max_temp_file_size;
     ssize_t            temp_file_write_size;
diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -2304,6 +2304,15 @@ ngx_http_upstream_send_response(ngx_http
     p->send_timeout = clcf->send_timeout;
     p->send_lowat = clcf->send_lowat;
 
+    p->length = -1;
+
+    if (u->input_filter_init
+        && u->input_filter_init(p->input_ctx) != NGX_OK)
+    {
+        ngx_http_upstream_finalize_request(r, u, 0);
+        return;
+    }
+
     u->read_event_handler = ngx_http_upstream_process_upstream;
     r->write_event_handler = ngx_http_upstream_process_downstream;