// 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 <errno.h>

#include <atomic>

#include <cstddef>

#include <cstdint>

#include <cstring>

#include <memory>

#include <ostream>

#include <string>

#include "absl/base/attributes.h"

#include "absl/base/config.h"

#include "absl/base/internal/raw_logging.h"

#include "absl/base/internal/strerror.h"

#include "absl/base/macros.h"

#include "absl/base/no_destructor.h"

#include "absl/base/nullability.h"

#include "absl/debugging/stacktrace.h"

#include "absl/debugging/symbolize.h"

#include "absl/status/internal/status_internal.h"

#include "absl/strings/str_cat.h"

#include "absl/strings/str_format.h"

#include "absl/strings/str_split.h"

#include "absl/strings/string_view.h"

#include "absl/types/optional.h"

namespace absl {

ABSL_NAMESPACE_BEGIN

static_assert(

    alignof(status_internal::StatusRep) >= 4,

    "absl::Status assumes it can use the bottom 2 bits of a StatusRep*.");

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);

}

absl::Nonnull<const std::string*> Status::EmptyString() {

  static const absl::NoDestructor<std::string> kEmpty;

  return kEmpty.get();

}

#ifdef ABSL_INTERNAL_NEED_REDUNDANT_CONSTEXPR_DECL

constexpr const char Status::kMovedFromString[];

#endif

absl::Nonnull<const std::string*> Status::MovedFromString() {

  static const absl::NoDestructor<std::string> kMovedFrom(kMovedFromString);

  return kMovedFrom.get();

}

Status::Status(absl::StatusCode code, absl::string_view msg)

    : rep_(CodeToInlinedRep(code)) {

  if (code != absl::StatusCode::kOk && !msg.empty()) {

    rep_ = PointerToRep(new status_internal::StatusRep(code, msg, nullptr));

  }

}

absl::Nonnull<status_internal::StatusRep*> Status::PrepareToModify(

    uintptr_t rep) {

  if (IsInlined(rep)) {

    return new status_internal::StatusRep(InlinedRepToCode(rep),

                                          absl::string_view(), nullptr);

  }

  return RepToPointer(rep)->CloneAndUnref();

}

std::string Status::ToStringSlow(uintptr_t rep, StatusToStringMode mode) {

  if (IsInlined(rep)) {

    return absl::StrCat(absl::StatusCodeToString(InlinedRepToCode(rep)), ": ");

  }

  return RepToPointer(rep)->ToString(mode);

}

std::ostream& operator<<(std::ostream& os, const Status& x) {

  os << x.ToString(StatusToStringMode::kWithEverything);

  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;

}

StatusCode ErrnoToStatusCode(int error_number) {

  switch (error_number) {

    case 0:

      return StatusCode::kOk;

    case EINVAL:        // Invalid argument

    case ENAMETOOLONG:  // Filename too long

    case E2BIG:         // Argument list too long

    case EDESTADDRREQ:  // Destination address required

    case EDOM:          // Mathematics argument out of domain of function

    case EFAULT:        // Bad address

    case EILSEQ:        // Illegal byte sequence

    case ENOPROTOOPT:   // Protocol not available

    case ENOSTR:        // Not a STREAM

    case ENOTSOCK:      // Not a socket

    case ENOTTY:        // Inappropriate I/O control operation

    case EPROTOTYPE:    // Protocol wrong type for socket

    case ESPIPE:        // Invalid seek

      return StatusCode::kInvalidArgument;

    case ETIMEDOUT:  // Connection timed out

    case ETIME:      // Timer expired

      return StatusCode::kDeadlineExceeded;

    case ENODEV:  // No such device

    case ENOENT:  // No such file or directory

#ifdef ENOMEDIUM

    case ENOMEDIUM:  // No medium found

#endif

    case ENXIO:  // No such device or address

    case ESRCH:  // No such process

      return StatusCode::kNotFound;

    case EEXIST:         // File exists

    case EADDRNOTAVAIL:  // Address not available

    case EALREADY:       // Connection already in progress

#ifdef ENOTUNIQ

    case ENOTUNIQ:  // Name not unique on network

#endif

      return StatusCode::kAlreadyExists;

    case EPERM:   // Operation not permitted

    case EACCES:  // Permission denied

#ifdef ENOKEY

    case ENOKEY:  // Required key not available

#endif

    case EROFS:  // Read only file system

      return StatusCode::kPermissionDenied;

    case ENOTEMPTY:   // Directory not empty

    case EISDIR:      // Is a directory

    case ENOTDIR:     // Not a directory

    case EADDRINUSE:  // Address already in use

    case EBADF:       // Invalid file descriptor

#ifdef EBADFD

    case EBADFD:  // File descriptor in bad state

#endif

    case EBUSY:    // Device or resource busy

    case ECHILD:   // No child processes

    case EISCONN:  // Socket is connected

#ifdef EISNAM

    case EISNAM:  // Is a named type file

#endif

#ifdef ENOTBLK

    case ENOTBLK:  // Block device required

#endif

    case ENOTCONN:  // The socket is not connected

    case EPIPE:     // Broken pipe

#ifdef ESHUTDOWN

    case ESHUTDOWN:  // Cannot send after transport endpoint shutdown

#endif

    case ETXTBSY:  // Text file busy

#ifdef EUNATCH

    case EUNATCH:  // Protocol driver not attached

#endif

      return StatusCode::kFailedPrecondition;

    case ENOSPC:  // No space left on device

#ifdef EDQUOT

    case EDQUOT:  // Disk quota exceeded

#endif

    case EMFILE:   // Too many open files

    case EMLINK:   // Too many links

    case ENFILE:   // Too many open files in system

    case ENOBUFS:  // No buffer space available

    case ENODATA:  // No message is available on the STREAM read queue

    case ENOMEM:   // Not enough space

    case ENOSR:    // No STREAM resources

#ifdef EUSERS

    case EUSERS:  // Too many users

#endif

      return StatusCode::kResourceExhausted;

#ifdef ECHRNG

    case ECHRNG:  // Channel number out of range

#endif

    case EFBIG:      // File too large

    case EOVERFLOW:  // Value too large to be stored in data type

    case ERANGE:     // Result too large

      return StatusCode::kOutOfRange;

#ifdef ENOPKG

    case ENOPKG:  // Package not installed

#endif

    case ENOSYS:        // Function not implemented

    case ENOTSUP:       // Operation not supported

    case EAFNOSUPPORT:  // Address family not supported

#ifdef EPFNOSUPPORT

    case EPFNOSUPPORT:  // Protocol family not supported

#endif

    case EPROTONOSUPPORT:  // Protocol not supported

#ifdef ESOCKTNOSUPPORT

    case ESOCKTNOSUPPORT:  // Socket type not supported

#endif

    case EXDEV:  // Improper link

      return StatusCode::kUnimplemented;

    case EAGAIN:  // Resource temporarily unavailable

#ifdef ECOMM

    case ECOMM:  // Communication error on send

#endif

    case ECONNREFUSED:  // Connection refused

    case ECONNABORTED:  // Connection aborted

    case ECONNRESET:    // Connection reset

    case EINTR:         // Interrupted function call

#ifdef EHOSTDOWN

    case EHOSTDOWN:  // Host is down

#endif

    case EHOSTUNREACH:  // Host is unreachable

    case ENETDOWN:      // Network is down

    case ENETRESET:     // Connection aborted by network

    case ENETUNREACH:   // Network unreachable

    case ENOLCK:        // No locks available

    case ENOLINK:       // Link has been severed

#ifdef ENONET

    case ENONET:  // Machine is not on the network

#endif

      return StatusCode::kUnavailable;

    case EDEADLK:  // Resource deadlock avoided

#ifdef ESTALE

    case ESTALE:  // Stale file handle

#endif

      return StatusCode::kAborted;

    case ECANCELED:  // Operation cancelled

      return StatusCode::kCancelled;

    default:

      return StatusCode::kUnknown;

  }

}

namespace {

std::string MessageForErrnoToStatus(int error_number,

                                    absl::string_view message) {

  return absl::StrCat(message, ": ",

                      absl::base_internal::StrError(error_number));

}

}  // namespace

Status ErrnoToStatus(int error_number, absl::string_view message) {

  return Status(ErrnoToStatusCode(error_number),

                MessageForErrnoToStatus(error_number, message));

}

absl::Nonnull<const char*> StatusMessageAsCStr(const Status& status) {

  // As an internal implementation detail, we guarantee that if status.message()

  // is non-empty, then the resulting string_view is null terminated.

  auto sv_message = status.message();

  return sv_message.empty() ? "" : sv_message.data();

}

ABSL_NAMESPACE_END

}  // namespace absl