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author | 2020-02-25 22:27:31 +0100 | |
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committer | 2020-02-25 17:56:58 -0500 | |
commit | b832dce8489ef7b6231384909fd9b68d5a5ff2b7 (patch) | |
tree | 3ad4be9a9a4105366be714da9458e076a77be18f /absl/status/status.cc | |
parent | aa844899c937bde5d2b24f276b59997e5b668bde (diff) |
Creation of LTS branch "lts_2020_02_25"20200225
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GitOrigin-RevId: 0033c9ea91a52ade7c6b725aa2ef3cbe15463421
Change-Id: I8a2b70063cb3ab40c6943a6db0fe40cae71ed8d7
Diffstat (limited to 'absl/status/status.cc')
-rw-r--r-- | absl/status/status.cc | 439 |
1 files changed, 439 insertions, 0 deletions
diff --git a/absl/status/status.cc b/absl/status/status.cc new file mode 100644 index 00000000..bbc1895e --- /dev/null +++ b/absl/status/status.cc @@ -0,0 +1,439 @@ +// Copyright 2019 The Abseil 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 +// +// https://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 "absl/status/status.h" + +#include <cassert> + +#include "absl/base/internal/raw_logging.h" +#include "absl/debugging/stacktrace.h" +#include "absl/debugging/symbolize.h" +#include "absl/status/status_payload_printer.h" +#include "absl/strings/escaping.h" +#include "absl/strings/str_cat.h" +#include "absl/strings/str_format.h" +#include "absl/strings/str_split.h" + +namespace absl { +ABSL_NAMESPACE_BEGIN + +// The implementation was intentionally kept same as util::error::Code_Name() +// to ease the migration. +std::string StatusCodeToString(StatusCode code) { + switch (code) { + case StatusCode::kOk: + return "OK"; + case StatusCode::kCancelled: + return "CANCELLED"; + case StatusCode::kUnknown: + return "UNKNOWN"; + case StatusCode::kInvalidArgument: + return "INVALID_ARGUMENT"; + case StatusCode::kDeadlineExceeded: + return "DEADLINE_EXCEEDED"; + case StatusCode::kNotFound: + return "NOT_FOUND"; + case StatusCode::kAlreadyExists: + return "ALREADY_EXISTS"; + case StatusCode::kPermissionDenied: + return "PERMISSION_DENIED"; + case StatusCode::kUnauthenticated: + return "UNAUTHENTICATED"; + case StatusCode::kResourceExhausted: + return "RESOURCE_EXHAUSTED"; + case StatusCode::kFailedPrecondition: + return "FAILED_PRECONDITION"; + case StatusCode::kAborted: + return "ABORTED"; + case StatusCode::kOutOfRange: + return "OUT_OF_RANGE"; + case StatusCode::kUnimplemented: + return "UNIMPLEMENTED"; + case StatusCode::kInternal: + return "INTERNAL"; + case StatusCode::kUnavailable: + return "UNAVAILABLE"; + case StatusCode::kDataLoss: + return "DATA_LOSS"; + default: + return ""; + } +} + +std::ostream& operator<<(std::ostream& os, StatusCode code) { + return os << StatusCodeToString(code); +} + +namespace status_internal { + +static int FindPayloadIndexByUrl(const Payloads* payloads, + absl::string_view type_url) { + if (payloads == nullptr) return -1; + + for (int i = 0; i < payloads->size(); ++i) { + if ((*payloads)[i].type_url == type_url) return i; + } + + return -1; +} + +// Convert canonical code to a value known to this binary. +absl::StatusCode MapToLocalCode(int value) { + absl::StatusCode code = static_cast<absl::StatusCode>(value); + switch (code) { + case absl::StatusCode::kOk: + case absl::StatusCode::kCancelled: + case absl::StatusCode::kUnknown: + case absl::StatusCode::kInvalidArgument: + case absl::StatusCode::kDeadlineExceeded: + case absl::StatusCode::kNotFound: + case absl::StatusCode::kAlreadyExists: + case absl::StatusCode::kPermissionDenied: + case absl::StatusCode::kResourceExhausted: + case absl::StatusCode::kFailedPrecondition: + case absl::StatusCode::kAborted: + case absl::StatusCode::kOutOfRange: + case absl::StatusCode::kUnimplemented: + case absl::StatusCode::kInternal: + case absl::StatusCode::kUnavailable: + case absl::StatusCode::kDataLoss: + case absl::StatusCode::kUnauthenticated: + return code; + default: + return absl::StatusCode::kUnknown; + } +} +} // namespace status_internal + +absl::optional<absl::Cord> Status::GetPayload( + absl::string_view type_url) const { + const auto* payloads = GetPayloads(); + int index = status_internal::FindPayloadIndexByUrl(payloads, type_url); + if (index != -1) return (*payloads)[index].payload; + + return absl::nullopt; +} + +void Status::SetPayload(absl::string_view type_url, absl::Cord payload) { + if (ok()) return; + + PrepareToModify(); + + status_internal::StatusRep* rep = RepToPointer(rep_); + if (!rep->payloads) { + rep->payloads = absl::make_unique<status_internal::Payloads>(); + } + + int index = + status_internal::FindPayloadIndexByUrl(rep->payloads.get(), type_url); + if (index != -1) { + (*rep->payloads)[index].payload = std::move(payload); + return; + } + + rep->payloads->push_back({std::string(type_url), std::move(payload)}); +} + +bool Status::ErasePayload(absl::string_view type_url) { + int index = status_internal::FindPayloadIndexByUrl(GetPayloads(), type_url); + if (index != -1) { + GetPayloads()->erase(GetPayloads()->begin() + index); + return true; + } + + return false; +} + +void Status::ForEachPayload( + const std::function<void(absl::string_view, const absl::Cord&)>& visitor) + const { + if (auto* payloads = GetPayloads()) { + bool in_reverse = + payloads->size() > 1 && reinterpret_cast<uintptr_t>(payloads) % 13 > 6; + + for (int index = 0; index < payloads->size(); ++index) { + const auto& elem = + (*payloads)[in_reverse ? payloads->size() - 1 - index : index]; + +#ifdef NDEBUG + visitor(elem.type_url, elem.payload); +#else + // In debug mode invaldiate the type url to prevent users from relying on + // this std::string lifetime. + + // NOLINTNEXTLINE intentional extra conversion to force temporary. + visitor(std::string(elem.type_url), elem.payload); +#endif // NDEBUG + } + } +} + +const std::string* Status::EmptyString() { + static std::string* empty_string = new std::string(); + return empty_string; +} + +constexpr const char Status::kMovedFromString[]; + +const std::string* Status::MovedFromString() { + static std::string* moved_from_string = new std::string(kMovedFromString); + return moved_from_string; +} + +void Status::UnrefNonInlined(uintptr_t rep) { + status_internal::StatusRep* r = RepToPointer(rep); + // Fast path: if ref==1, there is no need for a RefCountDec (since + // this is the only reference and therefore no other thread is + // allowed to be mucking with r). + if (r->ref.load(std::memory_order_acquire) == 1 || + r->ref.fetch_sub(1, std::memory_order_acq_rel) - 1 == 0) { + delete r; + } +} + +uintptr_t Status::NewRep(absl::StatusCode code, absl::string_view msg, + std::unique_ptr<status_internal::Payloads> payloads) { + status_internal::StatusRep* rep = new status_internal::StatusRep; + rep->ref.store(1, std::memory_order_relaxed); + rep->code = code; + rep->message.assign(msg.data(), msg.size()); + rep->payloads = std::move(payloads); + return PointerToRep(rep); +} + +Status::Status(absl::StatusCode code, absl::string_view msg) + : rep_(CodeToInlinedRep(code)) { + if (code != absl::StatusCode::kOk && !msg.empty()) { + rep_ = NewRep(code, msg, nullptr); + } +} + +int Status::raw_code() const { + if (IsInlined(rep_)) { + return static_cast<int>(InlinedRepToCode(rep_)); + } + status_internal::StatusRep* rep = RepToPointer(rep_); + return static_cast<int>(rep->code); +} + +absl::StatusCode Status::code() const { + return status_internal::MapToLocalCode(raw_code()); +} + +void Status::PrepareToModify() { + ABSL_RAW_CHECK(!ok(), "PrepareToModify shouldn't be called on OK status."); + if (IsInlined(rep_)) { + rep_ = NewRep(static_cast<absl::StatusCode>(raw_code()), + absl::string_view(), nullptr); + return; + } + + uintptr_t rep_i = rep_; + status_internal::StatusRep* rep = RepToPointer(rep_); + if (rep->ref.load(std::memory_order_acquire) != 1) { + std::unique_ptr<status_internal::Payloads> payloads; + if (rep->payloads) { + payloads = absl::make_unique<status_internal::Payloads>(*rep->payloads); + } + rep_ = NewRep(rep->code, message(), std::move(payloads)); + UnrefNonInlined(rep_i); + } +} + +bool Status::EqualsSlow(const absl::Status& a, const absl::Status& b) { + if (IsInlined(a.rep_) != IsInlined(b.rep_)) return false; + if (a.message() != b.message()) return false; + if (a.raw_code() != b.raw_code()) return false; + if (a.GetPayloads() == b.GetPayloads()) return true; + + const status_internal::Payloads no_payloads; + const status_internal::Payloads* larger_payloads = + a.GetPayloads() ? a.GetPayloads() : &no_payloads; + const status_internal::Payloads* smaller_payloads = + b.GetPayloads() ? b.GetPayloads() : &no_payloads; + if (larger_payloads->size() < smaller_payloads->size()) { + std::swap(larger_payloads, smaller_payloads); + } + if ((larger_payloads->size() - smaller_payloads->size()) > 1) return false; + // Payloads can be ordered differently, so we can't just compare payload + // vectors. + for (const auto& payload : *larger_payloads) { + + bool found = false; + for (const auto& other_payload : *smaller_payloads) { + if (payload.type_url == other_payload.type_url) { + if (payload.payload != other_payload.payload) { + return false; + } + found = true; + break; + } + } + if (!found) return false; + } + return true; +} + +std::string Status::ToStringSlow() const { + std::string text; + absl::StrAppend(&text, absl::StatusCodeToString(code()), ": ", message()); + status_internal::StatusPayloadPrinter printer = + status_internal::GetStatusPayloadPrinter(); + this->ForEachPayload([&](absl::string_view type_url, + const absl::Cord& payload) { + absl::optional<std::string> result; + if (printer) result = printer(type_url, payload); + absl::StrAppend( + &text, " [", type_url, "='", + result.has_value() ? *result : absl::CHexEscape(std::string(payload)), + "']"); + }); + + return text; +} + +std::ostream& operator<<(std::ostream& os, const Status& x) { + os << x.ToString(); + return os; +} + +Status AbortedError(absl::string_view message) { + return Status(absl::StatusCode::kAborted, message); +} + +Status AlreadyExistsError(absl::string_view message) { + return Status(absl::StatusCode::kAlreadyExists, message); +} + +Status CancelledError(absl::string_view message) { + return Status(absl::StatusCode::kCancelled, message); +} + +Status DataLossError(absl::string_view message) { + return Status(absl::StatusCode::kDataLoss, message); +} + +Status DeadlineExceededError(absl::string_view message) { + return Status(absl::StatusCode::kDeadlineExceeded, message); +} + +Status FailedPreconditionError(absl::string_view message) { + return Status(absl::StatusCode::kFailedPrecondition, message); +} + +Status InternalError(absl::string_view message) { + return Status(absl::StatusCode::kInternal, message); +} + +Status InvalidArgumentError(absl::string_view message) { + return Status(absl::StatusCode::kInvalidArgument, message); +} + +Status NotFoundError(absl::string_view message) { + return Status(absl::StatusCode::kNotFound, message); +} + +Status OutOfRangeError(absl::string_view message) { + return Status(absl::StatusCode::kOutOfRange, message); +} + +Status PermissionDeniedError(absl::string_view message) { + return Status(absl::StatusCode::kPermissionDenied, message); +} + +Status ResourceExhaustedError(absl::string_view message) { + return Status(absl::StatusCode::kResourceExhausted, message); +} + +Status UnauthenticatedError(absl::string_view message) { + return Status(absl::StatusCode::kUnauthenticated, message); +} + +Status UnavailableError(absl::string_view message) { + return Status(absl::StatusCode::kUnavailable, message); +} + +Status UnimplementedError(absl::string_view message) { + return Status(absl::StatusCode::kUnimplemented, message); +} + +Status UnknownError(absl::string_view message) { + return Status(absl::StatusCode::kUnknown, message); +} + +bool IsAborted(const Status& status) { + return status.code() == absl::StatusCode::kAborted; +} + +bool IsAlreadyExists(const Status& status) { + return status.code() == absl::StatusCode::kAlreadyExists; +} + +bool IsCancelled(const Status& status) { + return status.code() == absl::StatusCode::kCancelled; +} + +bool IsDataLoss(const Status& status) { + return status.code() == absl::StatusCode::kDataLoss; +} + +bool IsDeadlineExceeded(const Status& status) { + return status.code() == absl::StatusCode::kDeadlineExceeded; +} + +bool IsFailedPrecondition(const Status& status) { + return status.code() == absl::StatusCode::kFailedPrecondition; +} + +bool IsInternal(const Status& status) { + return status.code() == absl::StatusCode::kInternal; +} + +bool IsInvalidArgument(const Status& status) { + return status.code() == absl::StatusCode::kInvalidArgument; +} + +bool IsNotFound(const Status& status) { + return status.code() == absl::StatusCode::kNotFound; +} + +bool IsOutOfRange(const Status& status) { + return status.code() == absl::StatusCode::kOutOfRange; +} + +bool IsPermissionDenied(const Status& status) { + return status.code() == absl::StatusCode::kPermissionDenied; +} + +bool IsResourceExhausted(const Status& status) { + return status.code() == absl::StatusCode::kResourceExhausted; +} + +bool IsUnauthenticated(const Status& status) { + return status.code() == absl::StatusCode::kUnauthenticated; +} + +bool IsUnavailable(const Status& status) { + return status.code() == absl::StatusCode::kUnavailable; +} + +bool IsUnimplemented(const Status& status) { + return status.code() == absl::StatusCode::kUnimplemented; +} + +bool IsUnknown(const Status& status) { + return status.code() == absl::StatusCode::kUnknown; +} + +ABSL_NAMESPACE_END +} // namespace absl |