| // |
| // |
| // Copyright 2015 gRPC authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| // |
| // |
| |
| #include <grpc/support/port_platform.h> |
| |
| #include "src/core/lib/channel/channel_args.h" |
| |
| #include <limits.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include <algorithm> |
| #include <initializer_list> |
| #include <map> |
| #include <vector> |
| |
| #include "absl/strings/match.h" |
| #include "absl/strings/str_cat.h" |
| #include "absl/strings/str_format.h" |
| #include "absl/strings/str_join.h" |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| |
| #include "src/core/lib/gpr/useful.h" |
| #include "src/core/lib/gprpp/crash.h" |
| #include "src/core/lib/gprpp/match.h" |
| |
| namespace grpc_core { |
| |
| ChannelArgs::Pointer::Pointer(void* p, const grpc_arg_pointer_vtable* vtable) |
| : p_(p), vtable_(vtable == nullptr ? EmptyVTable() : vtable) {} |
| |
| ChannelArgs::Pointer::Pointer(const Pointer& other) |
| : p_(other.vtable_->copy(other.p_)), vtable_(other.vtable_) {} |
| |
| ChannelArgs::Pointer::Pointer(Pointer&& other) noexcept |
| : p_(other.p_), vtable_(other.vtable_) { |
| other.p_ = nullptr; |
| other.vtable_ = EmptyVTable(); |
| } |
| |
| const grpc_arg_pointer_vtable* ChannelArgs::Pointer::EmptyVTable() { |
| static const grpc_arg_pointer_vtable vtable = { |
| // copy |
| [](void* p) { return p; }, |
| // destroy |
| [](void*) {}, |
| // cmp |
| [](void* p1, void* p2) -> int { return QsortCompare(p1, p2); }, |
| }; |
| return &vtable; |
| } |
| |
| ChannelArgs::ChannelArgs() = default; |
| ChannelArgs::~ChannelArgs() = default; |
| ChannelArgs::ChannelArgs(const ChannelArgs& other) = default; |
| ChannelArgs& ChannelArgs::operator=(const ChannelArgs& other) = default; |
| ChannelArgs::ChannelArgs(ChannelArgs&& other) noexcept = default; |
| ChannelArgs& ChannelArgs::operator=(ChannelArgs&& other) noexcept = default; |
| |
| const ChannelArgs::Value* ChannelArgs::Get(absl::string_view name) const { |
| return args_.Lookup(name); |
| } |
| |
| bool ChannelArgs::Contains(absl::string_view name) const { |
| return Get(name) != nullptr; |
| } |
| |
| bool ChannelArgs::operator<(const ChannelArgs& other) const { |
| return args_ < other.args_; |
| } |
| |
| bool ChannelArgs::operator==(const ChannelArgs& other) const { |
| return args_ == other.args_; |
| } |
| |
| bool ChannelArgs::operator!=(const ChannelArgs& other) const { |
| return !(*this == other); |
| } |
| |
| bool ChannelArgs::WantMinimalStack() const { |
| return GetBool(GRPC_ARG_MINIMAL_STACK).value_or(false); |
| } |
| |
| ChannelArgs::ChannelArgs(AVL<std::string, Value> args) |
| : args_(std::move(args)) {} |
| |
| ChannelArgs ChannelArgs::Set(grpc_arg arg) const { |
| switch (arg.type) { |
| case GRPC_ARG_INTEGER: |
| return Set(arg.key, arg.value.integer); |
| case GRPC_ARG_STRING: |
| if (arg.value.string != nullptr) return Set(arg.key, arg.value.string); |
| return Set(arg.key, ""); |
| case GRPC_ARG_POINTER: |
| return Set(arg.key, |
| Pointer(arg.value.pointer.vtable->copy(arg.value.pointer.p), |
| arg.value.pointer.vtable)); |
| } |
| GPR_UNREACHABLE_CODE(return ChannelArgs()); |
| } |
| |
| ChannelArgs ChannelArgs::FromC(const grpc_channel_args* args) { |
| ChannelArgs result; |
| if (args != nullptr) { |
| for (size_t i = 0; i < args->num_args; i++) { |
| result = result.Set(args->args[i]); |
| } |
| } |
| return result; |
| } |
| |
| grpc_arg ChannelArgs::Value::MakeCArg(const char* name) const { |
| char* c_name = const_cast<char*>(name); |
| return Match( |
| rep_, |
| [c_name](int i) { return grpc_channel_arg_integer_create(c_name, i); }, |
| [c_name](const std::shared_ptr<const std::string>& s) { |
| return grpc_channel_arg_string_create(c_name, |
| const_cast<char*>(s->c_str())); |
| }, |
| [c_name](const Pointer& p) { |
| return grpc_channel_arg_pointer_create(c_name, p.c_pointer(), |
| p.c_vtable()); |
| }); |
| } |
| |
| bool ChannelArgs::Value::operator<(const Value& rhs) const { |
| if (rhs.rep_.index() != rep_.index()) return rep_.index() < rhs.rep_.index(); |
| switch (rep_.index()) { |
| case 0: |
| return absl::get<int>(rep_) < absl::get<int>(rhs.rep_); |
| case 1: |
| return *absl::get<std::shared_ptr<const std::string>>(rep_) < |
| *absl::get<std::shared_ptr<const std::string>>(rhs.rep_); |
| case 2: |
| return absl::get<Pointer>(rep_) < absl::get<Pointer>(rhs.rep_); |
| default: |
| Crash("unreachable"); |
| } |
| } |
| |
| bool ChannelArgs::Value::operator==(const Value& rhs) const { |
| if (rhs.rep_.index() != rep_.index()) return false; |
| switch (rep_.index()) { |
| case 0: |
| return absl::get<int>(rep_) == absl::get<int>(rhs.rep_); |
| case 1: |
| return *absl::get<std::shared_ptr<const std::string>>(rep_) == |
| *absl::get<std::shared_ptr<const std::string>>(rhs.rep_); |
| case 2: |
| return absl::get<Pointer>(rep_) == absl::get<Pointer>(rhs.rep_); |
| default: |
| Crash("unreachable"); |
| } |
| } |
| |
| ChannelArgs::CPtr ChannelArgs::ToC() const { |
| std::vector<grpc_arg> c_args; |
| args_.ForEach([&c_args](const std::string& key, const Value& value) { |
| c_args.push_back(value.MakeCArg(key.c_str())); |
| }); |
| return CPtr(static_cast<const grpc_channel_args*>( |
| grpc_channel_args_copy_and_add(nullptr, c_args.data(), c_args.size()))); |
| } |
| |
| ChannelArgs ChannelArgs::Set(absl::string_view name, Pointer value) const { |
| return Set(name, Value(std::move(value))); |
| } |
| |
| ChannelArgs ChannelArgs::Set(absl::string_view name, int value) const { |
| return Set(name, Value(value)); |
| } |
| |
| ChannelArgs ChannelArgs::Set(absl::string_view key, Value value) const { |
| return ChannelArgs(args_.Add(std::string(key), std::move(value))); |
| } |
| |
| ChannelArgs ChannelArgs::Set(absl::string_view key, |
| absl::string_view value) const { |
| return Set(key, std::string(value)); |
| } |
| |
| ChannelArgs ChannelArgs::Set(absl::string_view key, const char* value) const { |
| return Set(key, std::string(value)); |
| } |
| |
| ChannelArgs ChannelArgs::Set(absl::string_view key, std::string value) const { |
| return Set(key, Value(std::move(value))); |
| } |
| |
| ChannelArgs ChannelArgs::Remove(absl::string_view key) const { |
| return ChannelArgs(args_.Remove(key)); |
| } |
| |
| absl::optional<int> ChannelArgs::GetInt(absl::string_view name) const { |
| auto* v = Get(name); |
| if (v == nullptr) return absl::nullopt; |
| const auto* i = v->GetIfInt(); |
| if (i == nullptr) return absl::nullopt; |
| return *i; |
| } |
| |
| absl::optional<Duration> ChannelArgs::GetDurationFromIntMillis( |
| absl::string_view name) const { |
| auto ms = GetInt(name); |
| if (!ms.has_value()) return absl::nullopt; |
| if (*ms == INT_MAX) return Duration::Infinity(); |
| if (*ms == INT_MIN) return Duration::NegativeInfinity(); |
| return Duration::Milliseconds(*ms); |
| } |
| |
| absl::optional<absl::string_view> ChannelArgs::GetString( |
| absl::string_view name) const { |
| auto* v = Get(name); |
| if (v == nullptr) return absl::nullopt; |
| const auto* s = v->GetIfString(); |
| if (s == nullptr) return absl::nullopt; |
| return *s; |
| } |
| |
| absl::optional<std::string> ChannelArgs::GetOwnedString( |
| absl::string_view name) const { |
| absl::optional<absl::string_view> v = GetString(name); |
| if (!v.has_value()) return absl::nullopt; |
| return std::string(*v); |
| } |
| |
| void* ChannelArgs::GetVoidPointer(absl::string_view name) const { |
| auto* v = Get(name); |
| if (v == nullptr) return nullptr; |
| const auto* pp = v->GetIfPointer(); |
| if (pp == nullptr) return nullptr; |
| return pp->c_pointer(); |
| } |
| |
| absl::optional<bool> ChannelArgs::GetBool(absl::string_view name) const { |
| auto* v = Get(name); |
| if (v == nullptr) return absl::nullopt; |
| auto* i = v->GetIfInt(); |
| if (i == nullptr) { |
| gpr_log(GPR_ERROR, "%s ignored: it must be an integer", |
| std::string(name).c_str()); |
| return absl::nullopt; |
| } |
| switch (*i) { |
| case 0: |
| return false; |
| case 1: |
| return true; |
| default: |
| gpr_log(GPR_ERROR, "%s treated as bool but set to %d (assuming true)", |
| std::string(name).c_str(), *i); |
| return true; |
| } |
| } |
| |
| std::string ChannelArgs::ToString() const { |
| std::vector<std::string> arg_strings; |
| args_.ForEach([&arg_strings](const std::string& key, const Value& value) { |
| std::string value_str; |
| if (auto* i = value.GetIfInt()) { |
| value_str = std::to_string(*i); |
| } else if (auto* s = value.GetIfString()) { |
| value_str = *s; |
| } else if (auto* p = value.GetIfPointer()) { |
| value_str = absl::StrFormat("%p", p->c_pointer()); |
| } |
| arg_strings.push_back(absl::StrCat(key, "=", value_str)); |
| }); |
| return absl::StrCat("{", absl::StrJoin(arg_strings, ", "), "}"); |
| } |
| |
| ChannelArgs ChannelArgs::UnionWith(ChannelArgs other) const { |
| if (args_.Empty()) return other; |
| if (other.args_.Empty()) return *this; |
| if (args_.Height() <= other.args_.Height()) { |
| args_.ForEach([&other](const std::string& key, const Value& value) { |
| other.args_ = other.args_.Add(key, value); |
| }); |
| return other; |
| } else { |
| auto result = *this; |
| other.args_.ForEach([&result](const std::string& key, const Value& value) { |
| if (result.args_.Lookup(key) == nullptr) { |
| result.args_ = result.args_.Add(key, value); |
| } |
| }); |
| return result; |
| } |
| } |
| |
| ChannelArgs ChannelArgs::FuzzingReferenceUnionWith(ChannelArgs other) const { |
| // DO NOT OPTIMIZE THIS!! |
| args_.ForEach([&other](const std::string& key, const Value& value) { |
| other.args_ = other.args_.Add(key, value); |
| }); |
| return other; |
| } |
| |
| void ChannelArgs::ChannelArgsDeleter::operator()( |
| const grpc_channel_args* p) const { |
| grpc_channel_args_destroy(p); |
| } |
| |
| std::ostream& operator<<(std::ostream& out, const ChannelArgs& args) { |
| return out << args.ToString(); |
| } |
| |
| } // namespace grpc_core |
| |
| 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) { |
| return grpc_channel_args_copy_and_add_and_remove(src, nullptr, 0, to_add, |
| num_to_add); |
| } |
| |
| grpc_channel_args* grpc_channel_args_copy_and_remove( |
| const grpc_channel_args* src, const char** to_remove, |
| size_t num_to_remove) { |
| return grpc_channel_args_copy_and_add_and_remove(src, to_remove, |
| num_to_remove, nullptr, 0); |
| } |
| |
| static bool should_remove_arg(const grpc_arg* arg, const char** to_remove, |
| size_t num_to_remove) { |
| for (size_t i = 0; i < num_to_remove; ++i) { |
| if (strcmp(arg->key, to_remove[i]) == 0) return true; |
| } |
| return false; |
| } |
| |
| grpc_channel_args* grpc_channel_args_copy_and_add_and_remove( |
| const grpc_channel_args* src, const char** to_remove, size_t num_to_remove, |
| const grpc_arg* to_add, size_t num_to_add) { |
| // Figure out how many args we'll be copying. |
| size_t num_args_to_copy = 0; |
| if (src != nullptr) { |
| for (size_t i = 0; i < src->num_args; ++i) { |
| if (!should_remove_arg(&src->args[i], to_remove, num_to_remove)) { |
| ++num_args_to_copy; |
| } |
| } |
| } |
| // Create result. |
| grpc_channel_args* dst = |
| static_cast<grpc_channel_args*>(gpr_malloc(sizeof(grpc_channel_args))); |
| dst->num_args = num_args_to_copy + num_to_add; |
| if (dst->num_args == 0) { |
| dst->args = nullptr; |
| return dst; |
| } |
| dst->args = |
| static_cast<grpc_arg*>(gpr_malloc(sizeof(grpc_arg) * dst->num_args)); |
| // Copy args from src that are not being removed. |
| size_t dst_idx = 0; |
| if (src != nullptr) { |
| for (size_t i = 0; i < src->num_args; ++i) { |
| if (!should_remove_arg(&src->args[i], to_remove, num_to_remove)) { |
| dst->args[dst_idx++] = copy_arg(&src->args[i]); |
| } |
| } |
| } |
| // Add args from to_add. |
| for (size_t i = 0; i < num_to_add; ++i) { |
| dst->args[dst_idx++] = copy_arg(&to_add[i]); |
| } |
| GPR_ASSERT(dst_idx == dst->num_args); |
| return dst; |
| } |
| |
| grpc_channel_args* grpc_channel_args_copy(const grpc_channel_args* src) { |
| return grpc_channel_args_copy_and_add(src, nullptr, 0); |
| } |
| |
| grpc_channel_args* grpc_channel_args_union(const grpc_channel_args* a, |
| const grpc_channel_args* b) { |
| if (a == nullptr) return grpc_channel_args_copy(b); |
| if (b == nullptr) return grpc_channel_args_copy(a); |
| const size_t max_out = (a->num_args + b->num_args); |
| grpc_arg* uniques = |
| static_cast<grpc_arg*>(gpr_malloc(sizeof(*uniques) * max_out)); |
| for (size_t i = 0; i < a->num_args; ++i) uniques[i] = a->args[i]; |
| |
| size_t uniques_idx = a->num_args; |
| for (size_t i = 0; i < b->num_args; ++i) { |
| const char* b_key = b->args[i].key; |
| if (grpc_channel_args_find(a, b_key) == nullptr) { // not found |
| uniques[uniques_idx++] = b->args[i]; |
| } |
| } |
| grpc_channel_args* result = |
| grpc_channel_args_copy_and_add(nullptr, uniques, uniques_idx); |
| gpr_free(uniques); |
| return result; |
| } |
| |
| static int cmp_arg(const grpc_arg* a, const grpc_arg* b) { |
| int c = grpc_core::QsortCompare(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 grpc_core::QsortCompare(a->value.integer, b->value.integer); |
| case GRPC_ARG_POINTER: |
| return grpc_core::channel_args_detail::PointerCompare( |
| a->value.pointer.p, a->value.pointer.vtable, b->value.pointer.p, |
| b->value.pointer.vtable); |
| } |
| 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 = static_cast<const grpc_arg* const*>(ap); |
| const grpc_arg* const* b = static_cast<const grpc_arg* const*>(bp); |
| int c = strcmp((*a)->key, (*b)->key); |
| if (c == 0) c = grpc_core::QsortCompare(*a, *b); |
| return c; |
| } |
| |
| grpc_channel_args* grpc_channel_args_normalize(const grpc_channel_args* src) { |
| grpc_arg** args = |
| static_cast<grpc_arg**>(gpr_malloc(sizeof(grpc_arg*) * src->num_args)); |
| for (size_t i = 0; i < src->num_args; i++) { |
| args[i] = &src->args[i]; |
| } |
| if (src->num_args > 1) { |
| qsort(args, src->num_args, sizeof(grpc_arg*), cmp_key_stable); |
| } |
| |
| grpc_channel_args* b = |
| static_cast<grpc_channel_args*>(gpr_malloc(sizeof(grpc_channel_args))); |
| b->num_args = src->num_args; |
| b->args = static_cast<grpc_arg*>(gpr_malloc(sizeof(grpc_arg) * b->num_args)); |
| for (size_t i = 0; i < src->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); |
| } |
| |
| int grpc_channel_args_compare(const grpc_channel_args* a, |
| const grpc_channel_args* b) { |
| if (a == nullptr && b == nullptr) return 0; |
| if (a == nullptr || b == nullptr) return a == nullptr ? -1 : 1; |
| int c = grpc_core::QsortCompare(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; |
| } |
| |
| const grpc_arg* grpc_channel_args_find(const grpc_channel_args* args, |
| const char* name) { |
| if (args != nullptr) { |
| for (size_t i = 0; i < args->num_args; ++i) { |
| if (strcmp(args->args[i].key, name) == 0) { |
| return &args->args[i]; |
| } |
| } |
| } |
| return nullptr; |
| } |
| |
| int grpc_channel_arg_get_integer(const grpc_arg* arg, |
| const grpc_integer_options options) { |
| if (arg == nullptr) return options.default_value; |
| if (arg->type != GRPC_ARG_INTEGER) { |
| gpr_log(GPR_ERROR, "%s ignored: it must be an integer", arg->key); |
| return options.default_value; |
| } |
| if (arg->value.integer < options.min_value) { |
| gpr_log(GPR_ERROR, "%s ignored: it must be >= %d", arg->key, |
| options.min_value); |
| return options.default_value; |
| } |
| if (arg->value.integer > options.max_value) { |
| gpr_log(GPR_ERROR, "%s ignored: it must be <= %d", arg->key, |
| options.max_value); |
| return options.default_value; |
| } |
| return arg->value.integer; |
| } |
| |
| int grpc_channel_args_find_integer(const grpc_channel_args* args, |
| const char* name, |
| const grpc_integer_options options) { |
| const grpc_arg* arg = grpc_channel_args_find(args, name); |
| return grpc_channel_arg_get_integer(arg, options); |
| } |
| |
| char* grpc_channel_arg_get_string(const grpc_arg* arg) { |
| if (arg == nullptr) return nullptr; |
| if (arg->type != GRPC_ARG_STRING) { |
| gpr_log(GPR_ERROR, "%s ignored: it must be an string", arg->key); |
| return nullptr; |
| } |
| return arg->value.string; |
| } |
| |
| char* grpc_channel_args_find_string(const grpc_channel_args* args, |
| const char* name) { |
| const grpc_arg* arg = grpc_channel_args_find(args, name); |
| return grpc_channel_arg_get_string(arg); |
| } |
| |
| bool grpc_channel_arg_get_bool(const grpc_arg* arg, bool default_value) { |
| if (arg == nullptr) return default_value; |
| if (arg->type != GRPC_ARG_INTEGER) { |
| gpr_log(GPR_ERROR, "%s ignored: it must be an integer", arg->key); |
| return default_value; |
| } |
| switch (arg->value.integer) { |
| case 0: |
| return false; |
| case 1: |
| return true; |
| default: |
| gpr_log(GPR_ERROR, "%s treated as bool but set to %d (assuming true)", |
| arg->key, arg->value.integer); |
| return true; |
| } |
| } |
| |
| bool grpc_channel_args_find_bool(const grpc_channel_args* args, |
| const char* name, bool default_value) { |
| const grpc_arg* arg = grpc_channel_args_find(args, name); |
| return grpc_channel_arg_get_bool(arg, default_value); |
| } |
| |
| bool grpc_channel_args_want_minimal_stack(const grpc_channel_args* args) { |
| return grpc_channel_arg_get_bool( |
| grpc_channel_args_find(args, GRPC_ARG_MINIMAL_STACK), false); |
| } |
| |
| grpc_arg grpc_channel_arg_string_create(char* name, char* value) { |
| grpc_arg arg; |
| arg.type = GRPC_ARG_STRING; |
| arg.key = name; |
| arg.value.string = value; |
| return arg; |
| } |
| |
| grpc_arg grpc_channel_arg_integer_create(char* name, int value) { |
| grpc_arg arg; |
| arg.type = GRPC_ARG_INTEGER; |
| arg.key = name; |
| arg.value.integer = value; |
| return arg; |
| } |
| |
| grpc_arg grpc_channel_arg_pointer_create( |
| char* name, void* value, const grpc_arg_pointer_vtable* vtable) { |
| grpc_arg arg; |
| arg.type = GRPC_ARG_POINTER; |
| arg.key = name; |
| arg.value.pointer.p = value; |
| arg.value.pointer.vtable = vtable; |
| return arg; |
| } |
| |
| std::string grpc_channel_args_string(const grpc_channel_args* args) { |
| return grpc_core::ChannelArgs::FromC(args).ToString(); |
| } |
| |
| namespace grpc_core { |
| ChannelArgs ChannelArgsBuiltinPrecondition(const grpc_channel_args* src) { |
| if (src == nullptr) return ChannelArgs(); |
| ChannelArgs output; |
| std::map<absl::string_view, std::vector<absl::string_view>> |
| concatenated_values; |
| for (size_t i = 0; i < src->num_args; i++) { |
| absl::string_view key = src->args[i].key; |
| // User-agent strings were traditionally multi-valued and concatenated. |
| // We preserve this behavior for backwards compatibility. |
| if (key == GRPC_ARG_PRIMARY_USER_AGENT_STRING || |
| key == GRPC_ARG_SECONDARY_USER_AGENT_STRING) { |
| if (src->args[i].type != GRPC_ARG_STRING) { |
| gpr_log(GPR_ERROR, "Channel argument '%s' should be a string", |
| std::string(key).c_str()); |
| } else { |
| concatenated_values[key].push_back(src->args[i].value.string); |
| } |
| continue; |
| } else if (absl::StartsWith(key, "grpc.internal.")) { |
| continue; |
| } |
| if (!output.Contains(key)) { |
| output = output.Set(src->args[i]); |
| } else { |
| // Traditional grpc_channel_args_find behavior was to pick the first |
| // value. |
| // For compatibility with existing users, we will do the same here. |
| } |
| } |
| // Concatenate the concatenated values. |
| for (const auto& concatenated_value : concatenated_values) { |
| output = output.Set(concatenated_value.first, |
| absl::StrJoin(concatenated_value.second, " ")); |
| } |
| return output; |
| } |
| |
| } // namespace grpc_core |
| |
| namespace { |
| grpc_channel_args_client_channel_creation_mutator g_mutator = nullptr; |
| } // namespace |
| |
| void grpc_channel_args_set_client_channel_creation_mutator( |
| grpc_channel_args_client_channel_creation_mutator cb) { |
| GPR_DEBUG_ASSERT(g_mutator == nullptr); |
| g_mutator = cb; |
| } |
| grpc_channel_args_client_channel_creation_mutator |
| grpc_channel_args_get_client_channel_creation_mutator() { |
| return g_mutator; |
| } |