Upstream: flush low-level buffers on write retry. If the data to write is bigger than what the socket can send, and the reminder is smaller than NGX_SSL_BUFSIZE, then SSL_write() fails with SSL_ERROR_WANT_WRITE. The reminder of payload however is successfully copied to the low-level buffer and all the output chain buffers are flushed. This means that retry logic doesn't work because ngx_http_upstream_process_non_buffered_request() checks only if there's anything in the output chain buffers and ignores the fact that something may be buffered in low-level parts of the stack. Signed-off-by: Patryk Lesiewicz <patryk@google.com>

/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_SHA1_H_INCLUDED_
#define _NGX_SHA1_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>


typedef struct {
    uint64_t  bytes;
    uint32_t  a, b, c, d, e, f;
    u_char    buffer[64];
} ngx_sha1_t;


void ngx_sha1_init(ngx_sha1_t *ctx);
void ngx_sha1_update(ngx_sha1_t *ctx, const void *data, size_t size);
void ngx_sha1_final(u_char result[20], ngx_sha1_t *ctx);


#endif /* _NGX_SHA1_H_INCLUDED_ */