Mercurial > hg > nginx-quic
view src/http/v3/ngx_http_v3_parse.h @ 8759:56dec0d4e5b1 quic
QUIC: avoid excessive buffer allocations in stream output.
Previously, when a few bytes were send to a QUIC stream by the application, a
4K buffer was allocated for these bytes. Then a STREAM frame was created and
that entire buffer was used as data for that frame. The frame with the buffer
were in use up until the frame was acked by client. Meanwhile, when more
bytes were send to the stream, more buffers were allocated and assigned as
data to newer STREAM frames. In this scenario most buffer memory is unused.
Now the unused part of the stream output buffer is available for further
stream output while earlier parts of the buffer are waiting to be acked.
This is achieved by splitting the output buffer.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Fri, 24 Dec 2021 18:13:51 +0300 |
parents | d6e191a583cc |
children |
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/* * Copyright (C) Roman Arutyunyan * Copyright (C) Nginx, Inc. */ #ifndef _NGX_HTTP_V3_PARSE_H_INCLUDED_ #define _NGX_HTTP_V3_PARSE_H_INCLUDED_ #include <ngx_config.h> #include <ngx_core.h> #include <ngx_http.h> typedef struct { ngx_uint_t state; uint64_t value; } ngx_http_v3_parse_varlen_int_t; typedef struct { ngx_uint_t state; ngx_uint_t shift; uint64_t value; } ngx_http_v3_parse_prefix_int_t; typedef struct { ngx_uint_t state; uint64_t id; ngx_http_v3_parse_varlen_int_t vlint; } ngx_http_v3_parse_settings_t; typedef struct { ngx_uint_t state; ngx_uint_t insert_count; ngx_uint_t delta_base; ngx_uint_t sign; ngx_uint_t base; ngx_http_v3_parse_prefix_int_t pint; } ngx_http_v3_parse_field_section_prefix_t; typedef struct { ngx_uint_t state; ngx_uint_t length; ngx_uint_t huffman; ngx_str_t value; u_char *last; u_char huffstate; } ngx_http_v3_parse_literal_t; typedef struct { ngx_uint_t state; ngx_uint_t index; ngx_uint_t base; ngx_uint_t dynamic; ngx_str_t name; ngx_str_t value; ngx_http_v3_parse_prefix_int_t pint; ngx_http_v3_parse_literal_t literal; } ngx_http_v3_parse_field_t; typedef struct { ngx_uint_t state; ngx_http_v3_parse_field_t field; } ngx_http_v3_parse_field_rep_t; typedef struct { ngx_uint_t state; ngx_uint_t type; ngx_uint_t length; ngx_http_v3_parse_varlen_int_t vlint; ngx_http_v3_parse_field_section_prefix_t prefix; ngx_http_v3_parse_field_rep_t field_rep; } ngx_http_v3_parse_headers_t; typedef struct { ngx_uint_t state; ngx_http_v3_parse_field_t field; ngx_http_v3_parse_prefix_int_t pint; } ngx_http_v3_parse_encoder_t; typedef struct { ngx_uint_t state; ngx_http_v3_parse_prefix_int_t pint; } ngx_http_v3_parse_decoder_t; typedef struct { ngx_uint_t state; ngx_uint_t type; ngx_uint_t length; ngx_http_v3_parse_varlen_int_t vlint; ngx_http_v3_parse_settings_t settings; } ngx_http_v3_parse_control_t; typedef struct { ngx_uint_t state; ngx_http_v3_parse_varlen_int_t vlint; union { ngx_http_v3_parse_encoder_t encoder; ngx_http_v3_parse_decoder_t decoder; ngx_http_v3_parse_control_t control; } u; } ngx_http_v3_parse_uni_t; typedef struct { ngx_uint_t state; ngx_uint_t type; ngx_uint_t length; ngx_http_v3_parse_varlen_int_t vlint; } ngx_http_v3_parse_data_t; /* * Parse functions return codes: * NGX_DONE - parsing done * NGX_OK - sub-element done * NGX_AGAIN - more data expected * NGX_BUSY - waiting for external event * NGX_ERROR - internal error * NGX_HTTP_V3_ERROR_XXX - HTTP/3 or QPACK error */ ngx_int_t ngx_http_v3_parse_headers(ngx_connection_t *c, ngx_http_v3_parse_headers_t *st, ngx_buf_t *b); ngx_int_t ngx_http_v3_parse_data(ngx_connection_t *c, ngx_http_v3_parse_data_t *st, ngx_buf_t *b); ngx_int_t ngx_http_v3_parse_uni(ngx_connection_t *c, ngx_http_v3_parse_uni_t *st, ngx_buf_t *b); #endif /* _NGX_HTTP_V3_PARSE_H_INCLUDED_ */