Merge pull request #208 from martinRenou/make_orjson_optional

Make orjson optional

Author: martinRenou

README.md

@@ -14,7 +14,7 @@ It allows you to draw simple primitives directly from Python like text, lines, p
 
 You can try it online by clicking on this badge:
 
-[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/martinRenou/ipycanvas/stable?urlpath=lab%2Ftree%2Fexamples) 
+[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/martinRenou/ipycanvas/stable?urlpath=lab%2Ftree%2Fexamples)
 
 ## Documentation
 
@@ -32,7 +32,7 @@ Or join the gitter channel: [![Join the chat at https://gitter.im/martinRenou/ip
 You can install using `pip`:
 
 ```bash
-pip install ipycanvas
+pip install ipycanvas orjson
 ```
 
 Or using `conda`:

ipycanvas/utils.py

@@ -5,7 +5,12 @@
 
 import numpy as np
 
-import orjson
+try:
+    import orjson
+    ORJSON_AVAILABLE = True
+except ImportError:
+    import json
+    ORJSON_AVAILABLE = False
 
 
 def image_bytes_to_array(im_bytes):
@@ -71,7 +76,12 @@ def populate_args(arg, args, buffers):
 
 def commands_to_buffer(commands):
     # Turn the commands list into a binary buffer
-    return array_to_binary(np.frombuffer(
-        bytes(orjson.dumps(commands, option=orjson.OPT_SERIALIZE_NUMPY)),
-        dtype=np.uint8)
-    )
+    if ORJSON_AVAILABLE:
+        return array_to_binary(np.frombuffer(
+            bytes(orjson.dumps(commands, option=orjson.OPT_SERIALIZE_NUMPY)),
+            dtype=np.uint8)
+        )
+    else:
+        return array_to_binary(np.frombuffer(
+            bytes(json.dumps(commands), encoding='utf8'), dtype=np.uint8
+        ))

setup.py

@@ -96,8 +96,7 @@
     install_requires = [
         'ipywidgets>=7.6.0',
         'pillow>=6.0',
-        'numpy',
-        'orjson'
+        'numpy'
     ],
     extras_require = {},
     entry_points = {