Wasm: Allow to set the HTTP response status.

This commit enables WebAssembly modules to set the HTTP response status
to something other than the previously hard coded '200 OK'.

To do this they can make a call to nxt_wasm_set_resp_status() providing
the required status code.

If this function isn't called the status code defaults to '200 OK'. The
WebAssembly module can also return -1 from the request_handler function
as a short cut to signal a '500 Internal Server Error'.

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/src/wasm/nxt_wasm.h b/src/wasm/nxt_wasm.h
index cb9dbdfe..2748d764 100644
--- a/src/wasm/nxt_wasm.h
+++ b/src/wasm/nxt_wasm.h
@@ -118,12 +118,14 @@ struct nxt_wasm_ctx_s {
     size_t                   baddr_off;
 
     size_t                   response_off;
+
+    uint16_t                 status;
 };
 
 struct nxt_wasm_operations_s {
     int   (*init)(nxt_wasm_ctx_t *ctx);
     void  (*destroy)(const nxt_wasm_ctx_t *ctx);
-    void  (*exec_request)(const nxt_wasm_ctx_t *ctx);
+    int   (*exec_request)(nxt_wasm_ctx_t *ctx);
     void  (*exec_hook)(const nxt_wasm_ctx_t *ctx, nxt_wasm_fh_t hook);
 };