esphome/esphome/helpers.py

337 lines
9.4 KiB
Python

import codecs
from contextlib import suppress
import logging
import os
from pathlib import Path
from typing import Union
import tempfile
from urllib.parse import urlparse
_LOGGER = logging.getLogger(__name__)
def ensure_unique_string(preferred_string, current_strings):
test_string = preferred_string
current_strings_set = set(current_strings)
tries = 1
while test_string in current_strings_set:
tries += 1
test_string = f"{preferred_string}_{tries}"
return test_string
def indent_all_but_first_and_last(text, padding=" "):
lines = text.splitlines(True)
if len(lines) <= 2:
return text
return lines[0] + "".join(padding + line for line in lines[1:-1]) + lines[-1]
def indent_list(text, padding=" "):
return [padding + line for line in text.splitlines()]
def indent(text, padding=" "):
return "\n".join(indent_list(text, padding))
# From https://stackoverflow.com/a/14945195/8924614
def cpp_string_escape(string, encoding="utf-8"):
def _should_escape(byte: int) -> bool:
if not 32 <= byte < 127:
return True
if byte in (ord("\\"), ord('"')):
return True
return False
if isinstance(string, str):
string = string.encode(encoding)
result = ""
for character in string:
if _should_escape(character):
result += f"\\{character:03o}"
else:
result += chr(character)
return f'"{result}"'
def run_system_command(*args):
import subprocess
with subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE) as p:
stdout, stderr = p.communicate()
rc = p.returncode
return rc, stdout, stderr
def mkdir_p(path):
if not path:
# Empty path - means create current dir
return
try:
os.makedirs(path)
except OSError as err:
import errno
if err.errno == errno.EEXIST and os.path.isdir(path):
pass
else:
from esphome.core import EsphomeError
raise EsphomeError(f"Error creating directories {path}: {err}") from err
def is_ip_address(host):
parts = host.split(".")
if len(parts) != 4:
return False
try:
for p in parts:
int(p)
return True
except ValueError:
return False
def _resolve_with_zeroconf(host):
from esphome.core import EsphomeError
from esphome.zeroconf import EsphomeZeroconf
try:
zc = EsphomeZeroconf()
except Exception as err:
raise EsphomeError(
"Cannot start mDNS sockets, is this a docker container without "
"host network mode?"
) from err
try:
info = zc.resolve_host(f"{host}.")
except Exception as err:
raise EsphomeError(f"Error resolving mDNS hostname: {err}") from err
finally:
zc.close()
if info is None:
raise EsphomeError(
"Error resolving address with mDNS: Did not respond. "
"Maybe the device is offline."
)
return info
def resolve_ip_address(host):
from esphome.core import EsphomeError
import socket
errs = []
if host.endswith(".local"):
try:
return _resolve_with_zeroconf(host)
except EsphomeError as err:
errs.append(str(err))
try:
host_url = host if (urlparse(host).scheme != "") else "http://" + host
return socket.gethostbyname(urlparse(host_url).hostname)
except OSError as err:
errs.append(str(err))
raise EsphomeError(f"Error resolving IP address: {', '.join(errs)}") from err
def get_bool_env(var, default=False):
return bool(os.getenv(var, default))
def is_ha_addon():
return get_bool_env("ESPHOME_IS_HA_ADDON")
def walk_files(path):
for root, _, files in os.walk(path):
for name in files:
yield os.path.join(root, name)
def read_file(path):
try:
with codecs.open(path, "r", encoding="utf-8") as f_handle:
return f_handle.read()
except OSError as err:
from esphome.core import EsphomeError
raise EsphomeError(f"Error reading file {path}: {err}") from err
except UnicodeDecodeError as err:
from esphome.core import EsphomeError
raise EsphomeError(f"Error reading file {path}: {err}") from err
def _write_file(path: Union[Path, str], text: Union[str, bytes]):
"""Atomically writes `text` to the given path.
Automatically creates all parent directories.
"""
if not isinstance(path, Path):
path = Path(path)
data = text
if isinstance(text, str):
data = text.encode()
directory = path.parent
directory.mkdir(exist_ok=True, parents=True)
tmp_path = None
try:
with tempfile.NamedTemporaryFile(
mode="wb", dir=directory, delete=False
) as f_handle:
tmp_path = f_handle.name
f_handle.write(data)
# Newer tempfile implementations create the file with mode 0o600
os.chmod(tmp_path, 0o644)
# If destination exists, will be overwritten
os.replace(tmp_path, path)
finally:
if tmp_path is not None and os.path.exists(tmp_path):
try:
os.remove(tmp_path)
except OSError as err:
_LOGGER.error("Write file cleanup failed: %s", err)
def write_file(path: Union[Path, str], text: str):
try:
_write_file(path, text)
except OSError as err:
from esphome.core import EsphomeError
raise EsphomeError(f"Could not write file at {path}") from err
def write_file_if_changed(path: Union[Path, str], text: str) -> bool:
"""Write text to the given path, but not if the contents match already.
Returns true if the file was changed.
"""
if not isinstance(path, Path):
path = Path(path)
src_content = None
if path.is_file():
src_content = read_file(path)
if src_content == text:
return False
write_file(path, text)
return True
def copy_file_if_changed(src: os.PathLike, dst: os.PathLike) -> None:
import shutil
if file_compare(src, dst):
return
mkdir_p(os.path.dirname(dst))
try:
shutil.copyfile(src, dst)
except OSError as err:
if isinstance(err, PermissionError):
# Older esphome versions copied over the src file permissions too.
# So when the dst file had 444 permissions, the dst file would have those
# too and subsequent writes would fail
# -> delete file (it would be overwritten anyway), and try again
# if that fails, use normal error handler
with suppress(OSError):
os.unlink(dst)
shutil.copyfile(src, dst)
return
from esphome.core import EsphomeError
raise EsphomeError(f"Error copying file {src} to {dst}: {err}") from err
def list_starts_with(list_, sub):
return len(sub) <= len(list_) and all(list_[i] == x for i, x in enumerate(sub))
def file_compare(path1: os.PathLike, path2: os.PathLike) -> bool:
"""Return True if the files path1 and path2 have the same contents."""
import stat
try:
stat1, stat2 = os.stat(path1), os.stat(path2)
except OSError:
# File doesn't exist or another error -> not equal
return False
if (
stat.S_IFMT(stat1.st_mode) != stat.S_IFREG
or stat.S_IFMT(stat2.st_mode) != stat.S_IFREG
):
# At least one of them is not a regular file (or does not exist)
return False
if stat1.st_size != stat2.st_size:
# Different sizes
return False
bufsize = 8 * 1024
# Read files in blocks until a mismatch is found
with open(path1, "rb") as fh1, open(path2, "rb") as fh2:
while True:
blob1, blob2 = fh1.read(bufsize), fh2.read(bufsize)
if blob1 != blob2:
# Different content
return False
if not blob1:
# Reached end
return True
# A dict of types that need to be converted to heaptypes before a class can be added
# to the object
_TYPE_OVERLOADS = {
int: type("EInt", (int,), {}),
float: type("EFloat", (float,), {}),
str: type("EStr", (str,), {}),
dict: type("EDict", (dict,), {}),
list: type("EList", (list,), {}),
}
# cache created classes here
_CLASS_LOOKUP = {}
def add_class_to_obj(value, cls):
"""Add a class to a python type.
This function modifies value so that it has cls as a basetype.
The value itself may be modified by this action! You must use the return
value of this function however, since some types need to be copied first (heaptypes).
"""
if isinstance(value, cls):
# If already is instance, do not add
return value
try:
orig_cls = value.__class__
key = (orig_cls, cls)
new_cls = _CLASS_LOOKUP.get(key)
if new_cls is None:
new_cls = orig_cls.__class__(orig_cls.__name__, (orig_cls, cls), {})
_CLASS_LOOKUP[key] = new_cls
value.__class__ = new_cls
return value
except TypeError:
# Non heap type, look in overloads dict
for type_, func in _TYPE_OVERLOADS.items():
# Use type() here, we only need to trigger if it's the exact type,
# as otherwise we don't need to overload the class
if type(value) is type_: # pylint: disable=unidiomatic-typecheck
return add_class_to_obj(func(value), cls)
raise