Don't install mmh3 dependency at runtime

README.md

@@ -25,6 +25,16 @@ To install using pip:
 ```bash
 pip3 install tb-mqtt-client
 ```
+### Note on dependencies
+
+If you are running this on a platform that can't run packages with C library dependencies, and want to use the package `pymmh3` instead of `mmh3`, do the following instead:
+
+```bash
+pip3 install pymmh3 tb-mqtt-client --no-binary tb-mqtt-client
+```
+What happens by default, is that if python doesn't detect that `pymmh3` is installed, it will install `mmh3`. By running this command you install `pymmh3`. Therefore it is used, and `mmh3` is not installed.
+
+`--no-binary tb-mqtt-client` is required.
 
 ## Getting Started
 

sdk_utils.py

@@ -15,20 +15,8 @@
 from random import randint
 from zlib import crc32
 from hashlib import sha256, sha384, sha512, md5
+from mmh3 import hash, hash128
 import logging
-from subprocess import CalledProcessError
-
-from utils import install_package
-
-try:
-    install_package('mmh3')
-except CalledProcessError:
-    install_package('pymmh3')
-
-try:
-    from mmh3 import hash, hash128
-except ImportError:
-    from pymmh3 import hash, hash128
 
 log = logging.getLogger(__name__)
 

setup.py

@@ -14,6 +14,8 @@
 #
 
 from os import path
+from pkg_resources import DistributionNotFound, get_distribution
+from re import split
 from setuptools import setup
 
 
@@ -23,6 +25,39 @@
 
 VERSION = "1.5"
 
+INSTALL_REQUIRES = ['tb-paho-mqtt-client>=1.6.3', 'requests>=2.31.0', 'simplejson']
+
+# If none of packages in first installed, install second package
+CHOOSE_INSTALL_REQUIRES = [
+    (
+        ('pymmh3'),
+        'mmh3',
+    )
+]
+
+def choose_requirement(mains, secondary):
+    """If some version of main requirement installed, return main,
+    else return secondary.
+
+    """
+    chosen = secondary
+    for main in mains:
+        try:
+            name = split(r"[!<>=]", main)[0]
+            get_distribution(name)
+            chosen = main
+            break
+        except DistributionNotFound:
+            pass
+
+    return str(chosen)
+
+def get_install_requirements(install_requires, choose_install_requires):
+    for mains, secondary in choose_install_requires:
+        install_requires.append(choose_requirement(mains, secondary))
+
+    return install_requires
+
 setup(
     version=VERSION,
     name="tb-mqtt-client",
@@ -35,5 +70,5 @@
     long_description_content_type="text/markdown",
     python_requires=">=3.7",
     packages=["."],
-    install_requires=['tb-paho-mqtt-client>=1.6.3', 'requests>=2.31.0', 'simplejson'],
+    install_requires=get_install_requirements(INSTALL_REQUIRES, CHOOSE_INSTALL_REQUIRES),
     download_url='https://github.com/thingsboard/thingsboard-python-client-sdk/archive/%s.tar.gz' % VERSION)