| /* |
| * |
| * Copyright 2015, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #include "src/core/lib/channel/channel_args.h" |
| #include <grpc/grpc.h> |
| #include "src/core/lib/support/string.h" |
| |
| #include <grpc/compression.h> |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| #include <grpc/support/useful.h> |
| |
| #include <string.h> |
| |
| static grpc_arg copy_arg(const grpc_arg *src) { |
| grpc_arg dst; |
| dst.type = src->type; |
| dst.key = gpr_strdup(src->key); |
| switch (dst.type) { |
| case GRPC_ARG_STRING: |
| dst.value.string = gpr_strdup(src->value.string); |
| break; |
| case GRPC_ARG_INTEGER: |
| dst.value.integer = src->value.integer; |
| break; |
| case GRPC_ARG_POINTER: |
| dst.value.pointer = src->value.pointer; |
| dst.value.pointer.p = |
| src->value.pointer.vtable->copy(src->value.pointer.p); |
| break; |
| } |
| return dst; |
| } |
| |
| grpc_channel_args *grpc_channel_args_copy_and_add(const grpc_channel_args *src, |
| const grpc_arg *to_add, |
| size_t num_to_add) { |
| grpc_channel_args *dst = gpr_malloc(sizeof(grpc_channel_args)); |
| size_t i; |
| size_t src_num_args = (src == NULL) ? 0 : src->num_args; |
| if (!src && !to_add) { |
| dst->num_args = 0; |
| dst->args = NULL; |
| return dst; |
| } |
| dst->num_args = src_num_args + num_to_add; |
| dst->args = gpr_malloc(sizeof(grpc_arg) * dst->num_args); |
| for (i = 0; i < src_num_args; i++) { |
| dst->args[i] = copy_arg(&src->args[i]); |
| } |
| for (i = 0; i < num_to_add; i++) { |
| dst->args[i + src_num_args] = copy_arg(&to_add[i]); |
| } |
| return dst; |
| } |
| |
| grpc_channel_args *grpc_channel_args_copy(const grpc_channel_args *src) { |
| return grpc_channel_args_copy_and_add(src, NULL, 0); |
| } |
| |
| grpc_channel_args *grpc_channel_args_merge(const grpc_channel_args *a, |
| const grpc_channel_args *b) { |
| return grpc_channel_args_copy_and_add(a, b->args, b->num_args); |
| } |
| |
| static int cmp_arg(const grpc_arg *a, const grpc_arg *b) { |
| int c = GPR_ICMP(a->type, b->type); |
| if (c != 0) return c; |
| c = strcmp(a->key, b->key); |
| if (c != 0) return c; |
| switch (a->type) { |
| case GRPC_ARG_STRING: |
| return strcmp(a->value.string, b->value.string); |
| case GRPC_ARG_INTEGER: |
| return GPR_ICMP(a->value.integer, b->value.integer); |
| case GRPC_ARG_POINTER: |
| c = GPR_ICMP(a->value.pointer.p, b->value.pointer.p); |
| if (c != 0) { |
| c = GPR_ICMP(a->value.pointer.vtable, b->value.pointer.vtable); |
| if (c == 0) { |
| c = a->value.pointer.vtable->cmp(a->value.pointer.p, |
| b->value.pointer.p); |
| } |
| } |
| return c; |
| } |
| GPR_UNREACHABLE_CODE(return 0); |
| } |
| |
| /* stabilizing comparison function: since channel_args ordering matters for |
| * keys with the same name, we need to preserve that ordering */ |
| static int cmp_key_stable(const void *ap, const void *bp) { |
| const grpc_arg *const *a = ap; |
| const grpc_arg *const *b = bp; |
| int c = strcmp((*a)->key, (*b)->key); |
| if (c == 0) c = GPR_ICMP(*a, *b); |
| return c; |
| } |
| |
| grpc_channel_args *grpc_channel_args_normalize(const grpc_channel_args *a) { |
| grpc_arg **args = gpr_malloc(sizeof(grpc_arg *) * a->num_args); |
| for (size_t i = 0; i < a->num_args; i++) { |
| args[i] = &a->args[i]; |
| } |
| if (a->num_args > 1) |
| qsort(args, a->num_args, sizeof(grpc_arg *), cmp_key_stable); |
| |
| grpc_channel_args *b = gpr_malloc(sizeof(grpc_channel_args)); |
| b->num_args = a->num_args; |
| b->args = gpr_malloc(sizeof(grpc_arg) * b->num_args); |
| for (size_t i = 0; i < a->num_args; i++) { |
| b->args[i] = copy_arg(args[i]); |
| } |
| |
| gpr_free(args); |
| return b; |
| } |
| |
| void grpc_channel_args_destroy(grpc_channel_args *a) { |
| size_t i; |
| if (!a) return; |
| for (i = 0; i < a->num_args; i++) { |
| switch (a->args[i].type) { |
| case GRPC_ARG_STRING: |
| gpr_free(a->args[i].value.string); |
| break; |
| case GRPC_ARG_INTEGER: |
| break; |
| case GRPC_ARG_POINTER: |
| a->args[i].value.pointer.vtable->destroy(a->args[i].value.pointer.p); |
| break; |
| } |
| gpr_free(a->args[i].key); |
| } |
| gpr_free(a->args); |
| gpr_free(a); |
| } |
| |
| grpc_compression_algorithm grpc_channel_args_get_compression_algorithm( |
| const grpc_channel_args *a) { |
| size_t i; |
| if (a == NULL) return 0; |
| for (i = 0; i < a->num_args; ++i) { |
| if (a->args[i].type == GRPC_ARG_INTEGER && |
| !strcmp(GRPC_COMPRESSION_CHANNEL_DEFAULT_ALGORITHM, a->args[i].key)) { |
| return (grpc_compression_algorithm)a->args[i].value.integer; |
| break; |
| } |
| } |
| return GRPC_COMPRESS_NONE; |
| } |
| |
| grpc_channel_args *grpc_channel_args_set_compression_algorithm( |
| grpc_channel_args *a, grpc_compression_algorithm algorithm) { |
| GPR_ASSERT(algorithm < GRPC_COMPRESS_ALGORITHMS_COUNT); |
| grpc_arg tmp; |
| tmp.type = GRPC_ARG_INTEGER; |
| tmp.key = GRPC_COMPRESSION_CHANNEL_DEFAULT_ALGORITHM; |
| tmp.value.integer = algorithm; |
| return grpc_channel_args_copy_and_add(a, &tmp, 1); |
| } |
| |
| /** Returns 1 if the argument for compression algorithm's enabled states bitset |
| * was found in \a a, returning the arg's value in \a states. Otherwise, returns |
| * 0. */ |
| static int find_compression_algorithm_states_bitset(const grpc_channel_args *a, |
| int **states_arg) { |
| if (a != NULL) { |
| size_t i; |
| for (i = 0; i < a->num_args; ++i) { |
| if (a->args[i].type == GRPC_ARG_INTEGER && |
| !strcmp(GRPC_COMPRESSION_CHANNEL_ENABLED_ALGORITHMS_BITSET, |
| a->args[i].key)) { |
| *states_arg = &a->args[i].value.integer; |
| **states_arg |= 0x1; /* forcefully enable support for no compression */ |
| return 1; |
| } |
| } |
| } |
| return 0; /* GPR_FALSE */ |
| } |
| |
| grpc_channel_args *grpc_channel_args_compression_algorithm_set_state( |
| grpc_channel_args **a, grpc_compression_algorithm algorithm, int state) { |
| int *states_arg = NULL; |
| grpc_channel_args *result = *a; |
| const int states_arg_found = |
| find_compression_algorithm_states_bitset(*a, &states_arg); |
| |
| if (grpc_channel_args_get_compression_algorithm(*a) == algorithm && |
| state == 0) { |
| char *algo_name = NULL; |
| GPR_ASSERT(grpc_compression_algorithm_name(algorithm, &algo_name) != 0); |
| gpr_log(GPR_ERROR, |
| "Tried to disable default compression algorithm '%s'. The " |
| "operation has been ignored.", |
| algo_name); |
| } else if (states_arg_found) { |
| if (state != 0) { |
| GPR_BITSET((unsigned *)states_arg, algorithm); |
| } else if (algorithm != GRPC_COMPRESS_NONE) { |
| GPR_BITCLEAR((unsigned *)states_arg, algorithm); |
| } |
| } else { |
| /* create a new arg */ |
| grpc_arg tmp; |
| tmp.type = GRPC_ARG_INTEGER; |
| tmp.key = GRPC_COMPRESSION_CHANNEL_ENABLED_ALGORITHMS_BITSET; |
| /* all enabled by default */ |
| tmp.value.integer = (1u << GRPC_COMPRESS_ALGORITHMS_COUNT) - 1; |
| if (state != 0) { |
| GPR_BITSET((unsigned *)&tmp.value.integer, algorithm); |
| } else if (algorithm != GRPC_COMPRESS_NONE) { |
| GPR_BITCLEAR((unsigned *)&tmp.value.integer, algorithm); |
| } |
| result = grpc_channel_args_copy_and_add(*a, &tmp, 1); |
| grpc_channel_args_destroy(*a); |
| *a = result; |
| } |
| return result; |
| } |
| |
| uint32_t grpc_channel_args_compression_algorithm_get_states( |
| const grpc_channel_args *a) { |
| int *states_arg; |
| if (find_compression_algorithm_states_bitset(a, &states_arg)) { |
| return (uint32_t)*states_arg; |
| } else { |
| return (1u << GRPC_COMPRESS_ALGORITHMS_COUNT) - 1; /* All algs. enabled */ |
| } |
| } |
| |
| int grpc_channel_args_compare(const grpc_channel_args *a, |
| const grpc_channel_args *b) { |
| int c = GPR_ICMP(a->num_args, b->num_args); |
| if (c != 0) return c; |
| for (size_t i = 0; i < a->num_args; i++) { |
| c = cmp_arg(&a->args[i], &b->args[i]); |
| if (c != 0) return c; |
| } |
| return 0; |
| } |