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author | 2016-03-25 17:07:29 -0700 | |
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committer | 2016-03-25 17:07:29 -0700 | |
commit | f23078cbd302d32649537eedda1769c5685228d8 (patch) | |
tree | b0bb46845658e5b8256868d102076226aa10215e /src/core/lib/channel/channel_args.c | |
parent | f3d76384351039266e250aacf97c90d5b0c07dca (diff) |
Stage #1 of core breakup: move everything under lib
Diffstat (limited to 'src/core/lib/channel/channel_args.c')
-rw-r--r-- | src/core/lib/channel/channel_args.c | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/src/core/lib/channel/channel_args.c b/src/core/lib/channel/channel_args.c new file mode 100644 index 0000000000..e0382fa0d9 --- /dev/null +++ b/src/core/lib/channel/channel_args.c @@ -0,0 +1,271 @@ +/* + * + * Copyright 2015-2016, 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/channel/channel_args.h" +#include <grpc/grpc.h> +#include "src/core/support/string.h" + +#include <grpc/census.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]; + } + 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; + 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); +} + +int grpc_channel_args_is_census_enabled(const grpc_channel_args *a) { + size_t i; + if (a == NULL) return 0; + for (i = 0; i < a->num_args; i++) { + if (0 == strcmp(a->args[i].key, GRPC_ARG_ENABLE_CENSUS)) { + return a->args[i].value.integer != 0 && census_enabled(); + } + } + return census_enabled(); +} + +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_ALGORITHM_ARG, 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) { + grpc_arg tmp; + tmp.type = GRPC_ARG_INTEGER; + tmp.key = GRPC_COMPRESSION_ALGORITHM_ARG; + 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_ALGORITHM_STATE_ARG, a->args[i].key)) { + *states_arg = &a->args[i].value.integer; + return 1; /* GPR_TRUE */ + } + } + } + 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; + grpc_channel_args *result = *a; + const int states_arg_found = + find_compression_algorithm_states_bitset(*a, &states_arg); + + if (states_arg_found) { + if (state != 0) { + GPR_BITSET((unsigned *)states_arg, algorithm); + } else { + GPR_BITCLEAR((unsigned *)states_arg, algorithm); + } + } else { + /* create a new arg */ + grpc_arg tmp; + tmp.type = GRPC_ARG_INTEGER; + tmp.key = GRPC_COMPRESSION_ALGORITHM_STATE_ARG; + /* all enabled by default */ + tmp.value.integer = (1u << GRPC_COMPRESS_ALGORITHMS_COUNT) - 1; + if (state != 0) { + GPR_BITSET((unsigned *)&tmp.value.integer, algorithm); + } else { + 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; +} + +int 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 *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; +} |