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@ -779,6 +779,7 @@ static grpc_error* parse_indexed_field(grpc_chttp2_hpack_parser* p, |
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const uint8_t* cur, const uint8_t* end) { |
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p->dynamic_table_update_allowed = 0; |
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p->index = (*cur) & 0x7f; |
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p->md_for_index.payload = 0; /* Invalidate cached md when index changes. */ |
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return finish_indexed_field(p, cur + 1, end); |
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} |
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@ -791,17 +792,32 @@ static grpc_error* parse_indexed_field_x(grpc_chttp2_hpack_parser* p, |
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p->dynamic_table_update_allowed = 0; |
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p->next_state = and_then; |
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p->index = 0x7f; |
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p->md_for_index.payload = 0; /* Invalidate cached md when index changes. */ |
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p->parsing.value = &p->index; |
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return parse_value0(p, cur + 1, end); |
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} |
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/* When finishing with a header, get the cached md element for this index.
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This is set in parse_value_string(). We ensure (in debug mode) that the |
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cached metadata corresponds with the index we are examining. */ |
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static grpc_mdelem get_precomputed_md_for_idx(grpc_chttp2_hpack_parser* p) { |
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GPR_DEBUG_ASSERT(p->md_for_index.payload != 0); |
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GPR_DEBUG_ASSERT(static_cast<int64_t>(p->index) == p->precomputed_md_index); |
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grpc_mdelem md = p->md_for_index; |
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GPR_DEBUG_ASSERT(!GRPC_MDISNULL(md)); /* handled in string parsing */ |
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p->md_for_index.payload = 0; /* Invalidate cached md when index changes. */ |
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#ifndef NDEBUG |
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p->precomputed_md_index = -1; |
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#endif |
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return md; |
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} |
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/* finish a literal header with incremental indexing */ |
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static grpc_error* finish_lithdr_incidx(grpc_chttp2_hpack_parser* p, |
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const uint8_t* cur, |
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const uint8_t* end) { |
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grpc_mdelem md = grpc_chttp2_hptbl_lookup(&p->table, p->index); |
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GPR_ASSERT(!GRPC_MDISNULL(md)); /* handled in string parsing */ |
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GRPC_STATS_INC_HPACK_RECV_LITHDR_INCIDX(); |
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grpc_mdelem md = get_precomputed_md_for_idx(p); |
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grpc_error* err = on_hdr<true>( |
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p, grpc_mdelem_from_slices(grpc_slice_ref_internal(GRPC_MDKEY(md)), |
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take_string(p, &p->value, true))); |
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@ -829,6 +845,7 @@ static grpc_error* parse_lithdr_incidx(grpc_chttp2_hpack_parser* p, |
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p->dynamic_table_update_allowed = 0; |
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p->next_state = and_then; |
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p->index = (*cur) & 0x3f; |
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p->md_for_index.payload = 0; /* Invalidate cached md when index changes. */ |
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return parse_string_prefix(p, cur + 1, end); |
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} |
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@ -842,6 +859,7 @@ static grpc_error* parse_lithdr_incidx_x(grpc_chttp2_hpack_parser* p, |
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p->dynamic_table_update_allowed = 0; |
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p->next_state = and_then; |
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p->index = 0x3f; |
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p->md_for_index.payload = 0; /* Invalidate cached md when index changes. */ |
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p->parsing.value = &p->index; |
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return parse_value0(p, cur + 1, end); |
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} |
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@ -862,9 +880,8 @@ static grpc_error* parse_lithdr_incidx_v(grpc_chttp2_hpack_parser* p, |
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static grpc_error* finish_lithdr_notidx(grpc_chttp2_hpack_parser* p, |
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const uint8_t* cur, |
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const uint8_t* end) { |
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grpc_mdelem md = grpc_chttp2_hptbl_lookup(&p->table, p->index); |
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GPR_ASSERT(!GRPC_MDISNULL(md)); /* handled in string parsing */ |
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GRPC_STATS_INC_HPACK_RECV_LITHDR_NOTIDX(); |
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grpc_mdelem md = get_precomputed_md_for_idx(p); |
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grpc_error* err = on_hdr<false>( |
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p, grpc_mdelem_from_slices(grpc_slice_ref_internal(GRPC_MDKEY(md)), |
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take_string(p, &p->value, false))); |
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@ -892,6 +909,7 @@ static grpc_error* parse_lithdr_notidx(grpc_chttp2_hpack_parser* p, |
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p->dynamic_table_update_allowed = 0; |
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p->next_state = and_then; |
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p->index = (*cur) & 0xf; |
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p->md_for_index.payload = 0; /* Invalidate cached md when index changes. */ |
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return parse_string_prefix(p, cur + 1, end); |
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} |
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@ -905,6 +923,7 @@ static grpc_error* parse_lithdr_notidx_x(grpc_chttp2_hpack_parser* p, |
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p->dynamic_table_update_allowed = 0; |
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p->next_state = and_then; |
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p->index = 0xf; |
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p->md_for_index.payload = 0; /* Invalidate cached md when index changes. */ |
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p->parsing.value = &p->index; |
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return parse_value0(p, cur + 1, end); |
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} |
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@ -925,9 +944,8 @@ static grpc_error* parse_lithdr_notidx_v(grpc_chttp2_hpack_parser* p, |
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static grpc_error* finish_lithdr_nvridx(grpc_chttp2_hpack_parser* p, |
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const uint8_t* cur, |
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const uint8_t* end) { |
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grpc_mdelem md = grpc_chttp2_hptbl_lookup(&p->table, p->index); |
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GPR_ASSERT(!GRPC_MDISNULL(md)); /* handled in string parsing */ |
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GRPC_STATS_INC_HPACK_RECV_LITHDR_NVRIDX(); |
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grpc_mdelem md = get_precomputed_md_for_idx(p); |
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grpc_error* err = on_hdr<false>( |
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p, grpc_mdelem_from_slices(grpc_slice_ref_internal(GRPC_MDKEY(md)), |
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take_string(p, &p->value, false))); |
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@ -955,6 +973,7 @@ static grpc_error* parse_lithdr_nvridx(grpc_chttp2_hpack_parser* p, |
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p->dynamic_table_update_allowed = 0; |
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p->next_state = and_then; |
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p->index = (*cur) & 0xf; |
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p->md_for_index.payload = 0; /* Invalidate cached md when index changes. */ |
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return parse_string_prefix(p, cur + 1, end); |
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} |
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@ -968,6 +987,7 @@ static grpc_error* parse_lithdr_nvridx_x(grpc_chttp2_hpack_parser* p, |
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p->dynamic_table_update_allowed = 0; |
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p->next_state = and_then; |
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p->index = 0xf; |
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p->md_for_index.payload = 0; /* Invalidate cached md when index changes. */ |
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p->parsing.value = &p->index; |
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return parse_value0(p, cur + 1, end); |
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} |
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@ -1007,6 +1027,7 @@ static grpc_error* parse_max_tbl_size(grpc_chttp2_hpack_parser* p, |
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} |
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p->dynamic_table_update_allowed--; |
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p->index = (*cur) & 0x1f; |
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p->md_for_index.payload = 0; /* Invalidate cached md when index changes. */ |
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return finish_max_tbl_size(p, cur + 1, end); |
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} |
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@ -1025,6 +1046,7 @@ static grpc_error* parse_max_tbl_size_x(grpc_chttp2_hpack_parser* p, |
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p->dynamic_table_update_allowed--; |
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p->next_state = and_then; |
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p->index = 0x1f; |
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p->md_for_index.payload = 0; /* Invalidate cached md when index changes. */ |
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p->parsing.value = &p->index; |
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return parse_value0(p, cur + 1, end); |
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} |
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@ -1499,6 +1521,23 @@ static bool is_binary_literal_header(grpc_chttp2_hpack_parser* p) { |
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: p->key.data.referenced); |
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} |
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/* Cache the metadata for the given index during initial parsing. This avoids a
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pointless recomputation of the metadata when finishing a header. We read the |
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cached value in get_precomputed_md_for_idx(). */ |
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static void set_precomputed_md_idx(grpc_chttp2_hpack_parser* p, |
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grpc_mdelem md) { |
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GPR_DEBUG_ASSERT(p->md_for_index.payload == 0); |
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GPR_DEBUG_ASSERT(p->precomputed_md_index == -1); |
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p->md_for_index = md; |
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#ifndef NDEBUG |
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p->precomputed_md_index = p->index; |
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#endif |
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} |
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/* Determines if a metadata element key associated with the current parser index
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is a binary indexed header during string parsing. We'll need to revisit this |
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metadata when we're done parsing, so we cache the metadata for this index |
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here using set_precomputed_md_idx(). */ |
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static grpc_error* is_binary_indexed_header(grpc_chttp2_hpack_parser* p, |
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bool* is) { |
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grpc_mdelem elem = grpc_chttp2_hptbl_lookup(&p->table, p->index); |
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@ -1519,6 +1558,7 @@ static grpc_error* is_binary_indexed_header(grpc_chttp2_hpack_parser* p, |
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* interned. |
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* 4. Both static and interned element slices have non-null refcounts. */ |
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*is = grpc_is_refcounted_slice_binary_header(GRPC_MDKEY(elem)); |
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set_precomputed_md_idx(p, elem); |
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return GRPC_ERROR_NONE; |
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} |
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@ -1557,6 +1597,18 @@ void grpc_chttp2_hpack_parser_init(grpc_chttp2_hpack_parser* p) { |
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p->value.data.copied.str = nullptr; |
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p->value.data.copied.capacity = 0; |
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p->value.data.copied.length = 0; |
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/* Cached metadata for the current index the parser is handling. This is set
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to 0 initially, invalidated when the index changes, and invalidated when it |
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is read (by get_precomputed_md_for_idx()). It is set during string parsing, |
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by set_precomputed_md_idx() - which is called by parse_value_string(). |
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The goal here is to avoid recomputing the metadata for the index when |
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finishing with a header as well as the initial parse. */ |
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p->md_for_index.payload = 0; |
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#ifndef NDEBUG |
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/* In debug mode, this ensures that the cached metadata we're reading is in
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* fact correct for the index we are examining. */ |
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p->precomputed_md_index = -1; |
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#endif |
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p->dynamic_table_update_allowed = 2; |
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p->last_error = GRPC_ERROR_NONE; |
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grpc_chttp2_hptbl_init(&p->table); |
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