Esempio n. 1
0
/* encode an mdelem */
static void hpack_enc(grpc_chttp2_hpack_compressor *c, grpc_mdelem *elem,
                      framer_state *st) {
  uint32_t key_hash = elem->key->hash;
  uint32_t elem_hash = GRPC_MDSTR_KV_HASH(key_hash, elem->value->hash);
  size_t decoder_space_usage;
  uint32_t indices_key;
  int should_add_elem;

  GPR_ASSERT(GPR_SLICE_LENGTH(elem->key->slice) > 0);
  if (GPR_SLICE_START_PTR(elem->key->slice)[0] != ':') { /* regular header */
    st->seen_regular_header = 1;
  } else {
    GPR_ASSERT(
        st->seen_regular_header == 0 &&
        "Reserved header (colon-prefixed) happening after regular ones.");
  }

  inc_filter(HASH_FRAGMENT_1(elem_hash), &c->filter_elems_sum, c->filter_elems);

  /* is this elem currently in the decoders table? */

  if (c->entries_elems[HASH_FRAGMENT_2(elem_hash)] == elem &&
      c->indices_elems[HASH_FRAGMENT_2(elem_hash)] > c->tail_remote_index) {
    /* HIT: complete element (first cuckoo hash) */
    emit_indexed(c, dynidx(c, c->indices_elems[HASH_FRAGMENT_2(elem_hash)]),
                 st);
    return;
  }

  if (c->entries_elems[HASH_FRAGMENT_3(elem_hash)] == elem &&
      c->indices_elems[HASH_FRAGMENT_3(elem_hash)] > c->tail_remote_index) {
    /* HIT: complete element (second cuckoo hash) */
    emit_indexed(c, dynidx(c, c->indices_elems[HASH_FRAGMENT_3(elem_hash)]),
                 st);
    return;
  }

  /* should this elem be in the table? */
  decoder_space_usage = grpc_mdelem_get_size_in_hpack_table(elem);
  should_add_elem = decoder_space_usage < MAX_DECODER_SPACE_USAGE &&
                    c->filter_elems[HASH_FRAGMENT_1(elem_hash)] >=
                        c->filter_elems_sum / ONE_ON_ADD_PROBABILITY;

  /* no hits for the elem... maybe there's a key? */

  indices_key = c->indices_keys[HASH_FRAGMENT_2(key_hash)];
  if (c->entries_keys[HASH_FRAGMENT_2(key_hash)] == elem->key &&
      indices_key > c->tail_remote_index) {
    /* HIT: key (first cuckoo hash) */
    if (should_add_elem) {
      emit_lithdr_incidx(c, dynidx(c, indices_key), elem, st);
      add_elem(c, elem);
      return;
    } else {
      emit_lithdr_noidx(c, dynidx(c, indices_key), elem, st);
      return;
    }
    GPR_UNREACHABLE_CODE(return );
  }

  indices_key = c->indices_keys[HASH_FRAGMENT_3(key_hash)];
  if (c->entries_keys[HASH_FRAGMENT_3(key_hash)] == elem->key &&
      indices_key > c->tail_remote_index) {
    /* HIT: key (first cuckoo hash) */
    if (should_add_elem) {
      emit_lithdr_incidx(c, dynidx(c, indices_key), elem, st);
      add_elem(c, elem);
      return;
    } else {
      emit_lithdr_noidx(c, dynidx(c, indices_key), elem, st);
      return;
    }
    GPR_UNREACHABLE_CODE(return );
  }

  /* no elem, key in the table... fall back to literal emission */

  if (should_add_elem) {
    emit_lithdr_incidx_v(c, elem, st);
    add_elem(c, elem);
    return;
  } else {
    emit_lithdr_noidx_v(c, elem, st);
    return;
  }
  GPR_UNREACHABLE_CODE(return );
}
Esempio n. 2
0
/* encode an mdelem */
static void hpack_enc(grpc_exec_ctx *exec_ctx, grpc_chttp2_hpack_compressor *c,
                      grpc_mdelem elem, framer_state *st) {
  GPR_ASSERT(GRPC_SLICE_LENGTH(GRPC_MDKEY(elem)) > 0);
  if (GRPC_SLICE_START_PTR(GRPC_MDKEY(elem))[0] != ':') { /* regular header */
    st->seen_regular_header = 1;
  } else {
    GPR_ASSERT(
        st->seen_regular_header == 0 &&
        "Reserved header (colon-prefixed) happening after regular ones.");
  }

  if (grpc_http_trace && !GRPC_MDELEM_IS_INTERNED(elem)) {
    char *k = grpc_slice_to_c_string(GRPC_MDKEY(elem));
    char *v = grpc_slice_to_c_string(GRPC_MDVALUE(elem));
    gpr_log(
        GPR_DEBUG,
        "Encode: '%s: %s', elem_interned=%d [%d], k_interned=%d, v_interned=%d",
        k, v, GRPC_MDELEM_IS_INTERNED(elem), GRPC_MDELEM_STORAGE(elem),
        grpc_slice_is_interned(GRPC_MDKEY(elem)),
        grpc_slice_is_interned(GRPC_MDVALUE(elem)));
    gpr_free(k);
    gpr_free(v);
  }
  if (!GRPC_MDELEM_IS_INTERNED(elem)) {
    emit_lithdr_noidx_v(c, elem, st);
    return;
  }

  uint32_t key_hash;
  uint32_t value_hash;
  uint32_t elem_hash;
  size_t decoder_space_usage;
  uint32_t indices_key;
  int should_add_elem;

  key_hash = grpc_slice_hash(GRPC_MDKEY(elem));
  value_hash = grpc_slice_hash(GRPC_MDVALUE(elem));
  elem_hash = GRPC_MDSTR_KV_HASH(key_hash, value_hash);

  inc_filter(HASH_FRAGMENT_1(elem_hash), &c->filter_elems_sum, c->filter_elems);

  /* is this elem currently in the decoders table? */

  if (grpc_mdelem_eq(c->entries_elems[HASH_FRAGMENT_2(elem_hash)], elem) &&
      c->indices_elems[HASH_FRAGMENT_2(elem_hash)] > c->tail_remote_index) {
    /* HIT: complete element (first cuckoo hash) */
    emit_indexed(c, dynidx(c, c->indices_elems[HASH_FRAGMENT_2(elem_hash)]),
                 st);
    return;
  }

  if (grpc_mdelem_eq(c->entries_elems[HASH_FRAGMENT_3(elem_hash)], elem) &&
      c->indices_elems[HASH_FRAGMENT_3(elem_hash)] > c->tail_remote_index) {
    /* HIT: complete element (second cuckoo hash) */
    emit_indexed(c, dynidx(c, c->indices_elems[HASH_FRAGMENT_3(elem_hash)]),
                 st);
    return;
  }

  /* should this elem be in the table? */
  decoder_space_usage = grpc_mdelem_get_size_in_hpack_table(elem);
  should_add_elem = decoder_space_usage < MAX_DECODER_SPACE_USAGE &&
                    c->filter_elems[HASH_FRAGMENT_1(elem_hash)] >=
                        c->filter_elems_sum / ONE_ON_ADD_PROBABILITY;

  /* no hits for the elem... maybe there's a key? */

  indices_key = c->indices_keys[HASH_FRAGMENT_2(key_hash)];
  if (grpc_slice_eq(c->entries_keys[HASH_FRAGMENT_2(key_hash)],
                    GRPC_MDKEY(elem)) &&
      indices_key > c->tail_remote_index) {
    /* HIT: key (first cuckoo hash) */
    if (should_add_elem) {
      emit_lithdr_incidx(c, dynidx(c, indices_key), elem, st);
      add_elem(exec_ctx, c, elem);
      return;
    } else {
      emit_lithdr_noidx(c, dynidx(c, indices_key), elem, st);
      return;
    }
    GPR_UNREACHABLE_CODE(return );
  }

  indices_key = c->indices_keys[HASH_FRAGMENT_3(key_hash)];
  if (grpc_slice_eq(c->entries_keys[HASH_FRAGMENT_3(key_hash)],
                    GRPC_MDKEY(elem)) &&
      indices_key > c->tail_remote_index) {
    /* HIT: key (first cuckoo hash) */
    if (should_add_elem) {
      emit_lithdr_incidx(c, dynidx(c, indices_key), elem, st);
      add_elem(exec_ctx, c, elem);
      return;
    } else {
      emit_lithdr_noidx(c, dynidx(c, indices_key), elem, st);
      return;
    }
    GPR_UNREACHABLE_CODE(return );
  }

  /* no elem, key in the table... fall back to literal emission */

  if (should_add_elem) {
    emit_lithdr_incidx_v(c, elem, st);
    add_elem(exec_ctx, c, elem);
    return;
  } else {
    emit_lithdr_noidx_v(c, elem, st);
    return;
  }
  GPR_UNREACHABLE_CODE(return );
}