# Path: grpclib/metadata.py
# class Deadline:
#     """Represents request's deadline - fixed point in time
#     """
#     def __init__(self, *, _timestamp: float) -> None:
#         self._timestamp = _timestamp
# 
#     def __lt__(self, other: object) -> bool:
#         if not isinstance(other, Deadline):
#             raise TypeError('comparison is not supported between '
#                             'instances of \'{}\' and \'{}\''
#                             .format(type(self).__name__, type(other).__name__))
#         return self._timestamp < other._timestamp
# 
#     def __eq__(self, other: object) -> bool:
#         if not isinstance(other, Deadline):
#             return False
#         return self._timestamp == other._timestamp
# 
#     @classmethod
#     def from_headers(cls, headers: _Headers) -> Optional['Deadline']:
#         timeout = min(map(decode_timeout,
#                           (v for k, v in headers if k == 'grpc-timeout')),
#                       default=None)
#         if timeout is not None:
#             return cls.from_timeout(timeout)
#         else:
#             return None
# 
#     @classmethod
#     def from_timeout(cls, timeout: float) -> 'Deadline':
#         return cls(_timestamp=time.monotonic() + timeout)
# 
#     def time_remaining(self) -> float:
#         """Calculates remaining time for the current request completion
# 
#         This function returns time in seconds as a floating point number,
#         greater or equal to zero.
#         """
#         return max(0, self._timestamp - time.monotonic())
# 
# Path: grpclib/metadata.py
# def encode_timeout(timeout: float) -> str:
#     if timeout > 10:
#         return '{}S'.format(int(timeout))
#     elif timeout > 0.01:
#         return '{}m'.format(int(timeout * 10 ** 3))
#     elif timeout > 0.00001:
#         return '{}u'.format(int(timeout * 10 ** 6))
#     else:
#         return '{}n'.format(int(timeout * 10 ** 9))
# 
# def decode_timeout(value: str) -> float:
#     match = _TIMEOUT_RE.match(value)
#     if match is None:
#         raise ValueError('Invalid timeout: {}'.format(value))
#     timeout, unit = match.groups()
#     return int(timeout) * _UNITS[unit]
# 
# Path: grpclib/metadata.py
# def encode_metadata(metadata: _MetadataLike) -> _Headers:
#     if isinstance(metadata, Mapping):
#         metadata = metadata.items()
#     result = []
#     for key, value in metadata:
#         if (
#             key in _SPECIAL
#             or key.startswith('grpc-')
#             or not _KEY_RE.fullmatch(key)
#         ):
#             raise ValueError('Invalid metadata key: {!r}'.format(key))
#         if key.endswith('-bin'):
#             if not isinstance(value, bytes):
#                 raise TypeError('Invalid metadata value type, bytes expected: '
#                                 '{!r}'.format(value))
#             result.append((key, encode_bin_value(value).decode('ascii')))
#         else:
#             if not isinstance(value, str):
#                 raise TypeError('Invalid metadata value type, str expected: '
#                                 '{!r}'.format(value))
#             if not _VALUE_RE.fullmatch(value):
#                 raise ValueError('Invalid metadata value: {!r}'.format(value))
#             result.append((key, value))
#     return result
# 
# def decode_metadata(headers: _Headers) -> _Metadata:
#     metadata = cast(_Metadata, MultiDict())
#     for key, value in headers:
#         if key.startswith((':', 'grpc-')) or key in _SPECIAL:
#             continue
#         elif key.endswith('-bin'):
#             metadata.add(key, decode_bin_value(value.encode('ascii')))
#         else:
#             metadata.add(key, value)
#     return metadata
# 
# Path: grpclib/metadata.py
# def encode_grpc_message(message: str) -> str:
#     return quote(message, safe=_UNQUOTED, encoding='utf-8')
# 
# def decode_grpc_message(value: str) -> str:
#     return unquote(value, encoding='utf-8', errors='replace')


import pytest
from multidict import MultiDict
from grpclib.metadata import Deadline
from grpclib.metadata import encode_timeout, decode_timeout
from grpclib.metadata import encode_metadata, decode_metadata
from grpclib.metadata import encode_grpc_message, decode_grpc_message
    (0.00002, '20u'),
    (0.000001, '1000n'),
    (0.00000002, '20n'),
])
def test_encode_timeout(value, expected):
    assert encode_timeout(value) == expected


@pytest.mark.parametrize('value, expected', [
    ('5H', 5 * 3600),
    ('4M', 4 * 60),
    ('3S', 3),
    ('200m', pytest.approx(0.2)),
    ('100u', pytest.approx(0.0001)),
    ('50n', pytest.approx(0.00000005)),
])
def test_decode_timeout(value, expected):
    assert decode_timeout(value) == expected


def test_deadline():
    assert Deadline.from_timeout(1) < Deadline.from_timeout(2)

    with pytest.raises(TypeError) as err:
        Deadline.from_timeout(1) < 'invalid'
    err.match('comparison is not supported between instances '
              'of \'Deadline\' and \'str\'')

    assert Deadline(_timestamp=1) == Deadline(_timestamp=1)


# Path: grpclib/metadata.py
# class Deadline:
#     """Represents request's deadline - fixed point in time
#     """
#     def __init__(self, *, _timestamp: float) -> None:
#         self._timestamp = _timestamp
# 
#     def __lt__(self, other: object) -> bool:
#         if not isinstance(other, Deadline):
#             raise TypeError('comparison is not supported between '
#                             'instances of \'{}\' and \'{}\''
#                             .format(type(self).__name__, type(other).__name__))
#         return self._timestamp < other._timestamp
# 
#     def __eq__(self, other: object) -> bool:
#         if not isinstance(other, Deadline):
#             return False
#         return self._timestamp == other._timestamp
# 
#     @classmethod
#     def from_headers(cls, headers: _Headers) -> Optional['Deadline']:
#         timeout = min(map(decode_timeout,
#                           (v for k, v in headers if k == 'grpc-timeout')),
#                       default=None)
#         if timeout is not None:
#             return cls.from_timeout(timeout)
#         else:
#             return None
# 
#     @classmethod
#     def from_timeout(cls, timeout: float) -> 'Deadline':
#         return cls(_timestamp=time.monotonic() + timeout)
# 
#     def time_remaining(self) -> float:
#         """Calculates remaining time for the current request completion
# 
#         This function returns time in seconds as a floating point number,
#         greater or equal to zero.
#         """
#         return max(0, self._timestamp - time.monotonic())
# 
# Path: grpclib/metadata.py
# def encode_timeout(timeout: float) -> str:
#     if timeout > 10:
#         return '{}S'.format(int(timeout))
#     elif timeout > 0.01:
#         return '{}m'.format(int(timeout * 10 ** 3))
#     elif timeout > 0.00001:
#         return '{}u'.format(int(timeout * 10 ** 6))
#     else:
#         return '{}n'.format(int(timeout * 10 ** 9))
# 
# def decode_timeout(value: str) -> float:
#     match = _TIMEOUT_RE.match(value)
#     if match is None:
#         raise ValueError('Invalid timeout: {}'.format(value))
#     timeout, unit = match.groups()
#     return int(timeout) * _UNITS[unit]
# 
# Path: grpclib/metadata.py
# def encode_metadata(metadata: _MetadataLike) -> _Headers:
#     if isinstance(metadata, Mapping):
#         metadata = metadata.items()
#     result = []
#     for key, value in metadata:
#         if (
#             key in _SPECIAL
#             or key.startswith('grpc-')
#             or not _KEY_RE.fullmatch(key)
#         ):
#             raise ValueError('Invalid metadata key: {!r}'.format(key))
#         if key.endswith('-bin'):
#             if not isinstance(value, bytes):
#                 raise TypeError('Invalid metadata value type, bytes expected: '
#                                 '{!r}'.format(value))
#             result.append((key, encode_bin_value(value).decode('ascii')))
#         else:
#             if not isinstance(value, str):
#                 raise TypeError('Invalid metadata value type, str expected: '
#                                 '{!r}'.format(value))
#             if not _VALUE_RE.fullmatch(value):
#                 raise ValueError('Invalid metadata value: {!r}'.format(value))
#             result.append((key, value))
#     return result
# 
# def decode_metadata(headers: _Headers) -> _Metadata:
#     metadata = cast(_Metadata, MultiDict())
#     for key, value in headers:
#         if key.startswith((':', 'grpc-')) or key in _SPECIAL:
#             continue
#         elif key.endswith('-bin'):
#             metadata.add(key, decode_bin_value(value.encode('ascii')))
#         else:
#             metadata.add(key, value)
#     return metadata
# 
# Path: grpclib/metadata.py
# def encode_grpc_message(message: str) -> str:
#     return quote(message, safe=_UNQUOTED, encoding='utf-8')
# 
# def decode_grpc_message(value: str) -> str:
#     return unquote(value, encoding='utf-8', errors='replace')


# Path: tests/test_metadata.py
import pytest
from multidict import MultiDict
from grpclib.metadata import Deadline
from grpclib.metadata import encode_timeout, decode_timeout
from grpclib.metadata import encode_metadata, decode_metadata
from grpclib.metadata import encode_grpc_message, decode_grpc_message

    (0.00002, '20u'),
    (0.000001, '1000n'),
    (0.00000002, '20n'),
])
def test_encode_timeout(value, expected):
    assert encode_timeout(value) == expected


@pytest.mark.parametrize('value, expected', [
    ('5H', 5 * 3600),
    ('4M', 4 * 60),
    ('3S', 3),
    ('200m', pytest.approx(0.2)),
    ('100u', pytest.approx(0.0001)),
    ('50n', pytest.approx(0.00000005)),
])
def test_decode_timeout(value, expected):
    assert decode_timeout(value) == expected


def test_deadline():
    assert Deadline.from_timeout(1) < Deadline.from_timeout(2)

    with pytest.raises(TypeError) as err:
        Deadline.from_timeout(1) < 'invalid'
    err.match('comparison is not supported between instances '
              'of \'Deadline\' and \'str\'')

    assert Deadline(_timestamp=1) == Deadline(_timestamp=1)


    assert Deadline.from_timeout(1) != 'invalid'