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Very fast Python JSON parsing library

License: Apache License 2.0

Python 0.28% C++ 99.46% Dockerfile 0.01% C 0.03% Cython 0.21% Shell 0.02%

python cython json simdjson

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cysimdjson's Issues

TypeError: expected bytes, str found

Im not computer science guy (mechanical eng.), so hopefully the question is not too off. My project involves streaming millions of data (speed is very important) via websocket client delivered as string messages containing a system's operational parameters in json/dict format. One pushed message is a list (actual list in string) containing several dictionaries through which we iterate and analyse in real time. A 3 abbreviated separately pushed messages would look sth like this:

[{"t":1611064750942,"Signal003":"Q","Signal003_MODE":1,"Signal003_TARGET":11,"Signal003_NEXT":8,"Signal003_IRV":9.05,"Signal003_ONOFF":9.06,"Signal003_TEMP":5,"Signal001_PRES":98, ,"Signal001_ENT":3}]
[{"t":1611064750943,"Signal033":"T","Signal003_MODE":1,"Signal003_TARGET":5170,"Signal001_ONOFF":19,"Signal001_TEMP":91.28,"s":6445,"Signal033_IRV":[12],"Signal003_ENT":3},{"Signal003":"T","Signal003_MODE":2,"Signal003_TARGET":5171,"Signal001_ONOFF":8,"Signal001_TEMP":9.04,"s":100,"Signal033_IRV":[12],"t":1611064750943,"Signal003_ENT":3}]
[{"t":1611064750943,"Signal065":"T","Signal003_MODE":3,"Signal003_TARGET":5172,"Signal001_ONOFF":8,"Signal001_TEMP":9.04,"s":1000,"Signal033_IRV":[12],"Signal003_ENT":3},{"Signal003":"T","Signal003_MODE":1,"Signal003_TARGET":5173,"Signal001_ONOFF":8,"Signal001_TEMP":9.04,"s":100,"Signal033_IRV":[12],"t":1611064750943,"Signal003_ENT":3},{"Signal003":"T","Signal003_MODE":1,"Signal003_TARGET":7116,"Signal001_ONOFF":12,"Signal001_TEMP":9.04,"s":10,"Signal033_IRV":[14,12,37,41],"t":1611064750943,Signal003_ENT":3},{"Signal003":"T","Signal003_MODE":1,"Signal003_TARGET":961,"Signal001_ONOFF":19,"Signal001_TEMP":9.04,"s":4,"Signal033_IRV":[14,12,37,41],"t":1611064750943,Signal003_ENT":3},{"Signal003":"T","Signal003_MODE":1,"Signal003_TARGET":962,"Signal001_ONOFF":19,"Signal001_TEMP":9.04,"s":10,"Signal033_IRV":[14,12,37,41],"t":1611064750943,"Signal003_ENT":3}]

On your frontpage, I saw the example and if understood it correctly, the message should be in byte format, hence I understand the TypeError Im getting:

json_bytes = b'''
{
  "foo": [1,2,[3]]
}
'''

Would it be possible to parse a string message within the cysimdjson library as we have no influence on the type of the pushed message from the websocket? I hope the question is not too off, but since websockets libraries in conjunction with json formats are widely used, I was thinking the problem might be worth looking into. Also, I can imagine that one could do the string conversion somehow in python, but C speed would probably be affected. At the moment, I use orjson, which is pretty fast and working well, but looking at your results, it ignites the interest. Regardless of the answer, thank you for the efforts with the library.

How to convert to a dict when needed?

What is the best way to convert to a dict? I tried dict(obj) and was able to get a dict but some keys are still things like <cysimdjson.cysimdjson.JSONArray object at 0x7f523a0ff090>

Would creating a method to recursively go through the fields and convert be the best method or is there a built-in method to convert a JSON with nested fields / arrays into a dict? I understand the sacrifice in speed but we would only be doing this with JSON objects that match a specific key value within the JSON.

Thanks so much for this amazing module! It is amazingly fast.

Support for serializing

Hi!
Does cysimdjson not support dumping/serializing a loaded JSON? I want to extract certain parts and then write them back to disk.

Thank you,
Patrick

GIL?

Hello,

I was wondering if there's a reason not to drop the GIL during simdjson parse() invocations.

Thanks!

detailed documentation and examples

there is not any documentation to introduce any function and module. so it is difficult to use it for a person that have not experience

Explode/Flatten to CSV example?

Do you have an example of this?
https://stackoverflow.com/questions/54210389/is-there-a-generic-way-to-read-the-multiline-json-in-spark-more-specifically-sp

Documentation for Pythonic drop-in API is wrong

parser = cysimdjson.JSONParser()
json_parsed = parser.loads(json_bytes)

# Access using JSON Pointer
print(json_parsed.json_parsed['foo'])

passing bytes to parser.loads returns a TypeError: the param is expected to be str https://github.com/TeskaLabs/cysimdjson/blob/main/cysimdjson/cysimdjson.pyx#L454
even passing str json_parsed has no json_parsed element, like it is written in the print example

I ended up doing something like:

parser.parse(payload).get_value()

I still have to validate that's what I need :)
(at the moment I'm parsing only and not accessing the object)

Reusing parser modifies previous results

Installed via PyPI

from cysimdjson import JSONParser
parser = JSONParser()
result = parser.parse(b'{"hello": "world"}')
print(result['hello'])  # "world"
new_result = parser.parse(b'{"hello": "universe"}')
print(result['hello'])  # "universe"

This only happens when reusing a previous parser instance. I'm not sure whether this is by design, but if it is, it should probably be explicitly documented to avoid confusion.

It also becomes especially iffy when mixing different types:

result = parser.parse(b'{"hello": "world"}')
print(type(result))  # JSONObject
print(list(result.keys()))  # ['hello']
new_result = parser.parse(b'[1,2,3]')
print(type(result))  # JSONObject
print(type(new_result))  # JSONArray
print(list(result.keys()))  # ['hello', 'hello', 'hello']

So if it is by design, it might be worthwhile to somehow invalidate the previous reference when a new document is parsed.

Segfault when installed from pip

$ pip3 install --user cysimdjson
Collecting cysimdjson
  Downloading cysimdjson-21.11-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (1.5 MB)
     |████████████████████████████████| 1.5 MB 1.3 MB/s
Installing collected packages: cysimdjson
Successfully installed cysimdjson-21.11
$ python3 convert-pa-json.py infile.geojson
ID,Name,Polygon
Segmentation fault (core dumped)

Error when installing 21.11b2 from pypi

Hi.
When i try to install latest version from pypi i get this error: ValueError: 'cysimdjson/cysimdjson.pyx' doesn't match any files
Looks like cysimdjson.pyx is missing.

Implement iter on JSONArray

When looping over a long array (e.g. 100,000 elements), the current JSONArray implementation with len and getitem manifests quadratic running time. If a new iter method on JSONArray were implemented using the yield keyword and the loop pattern already used in contains, this could be reduced to the expected linear time.

(The same logic would apply to implementing iter on JSONElement.)

Get " ambiguous template specialization ‘get<>’" error when trying to install with PIP

This is on CentOS 7 with gcc 7.3.0 trying to install for Python 3.10. Is the latter maybe not supported yet?

Here is the entire PIP error trace:

Collecting cysimdjson
  Using cached cysimdjson-21.4a4.tar.gz (370 kB)
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
    Preparing wheel metadata ... done
Building wheels for collected packages: cysimdjson
  Building wheel for cysimdjson (PEP 517) ... error
  ERROR: Command errored out with exit status 1:
   command: /usr/local/bin/python3.10 /usr/local/lib/python3.10/site-packages/pip/_vendor/pep517/in_process/_in_process.py build_wheel /tmp/tmp1cpu0ci3
       cwd: /tmp/pip-install-7c4qotgp/cysimdjson_9b536c74e59e4472990b6003d8d6d3e9
  Complete output (263 lines):
  /tmp/pip-build-env-tzj3aepc/overlay/lib/python3.10/site-packages/setuptools/dist.py:487: UserWarning: Normalizing '21.4-a4' to '21.4a4'
    warnings.warn(tmpl.format(**locals()))
  running bdist_wheel
  running build
  running build_py
  package init file 'cysimdjson/__init__.py' not found (or not a regular file)
  running build_ext
  building 'cysimdjson' extension
  creating build
  creating build/temp.linux-x86_64-3.10
  creating build/temp.linux-x86_64-3.10/cysimdjson
  creating build/temp.linux-x86_64-3.10/cysimdjson/pysimdjson
  creating build/temp.linux-x86_64-3.10/cysimdjson/simdjson
  /usr/local/bin/gcc -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -fPIC -Icysimdjson -I/usr/local/include/python3.10 -c cysimdjson/cysimdjson.cpp -o build/temp.linux-x86_64-3.10/cysimdjson/cysimdjson.o -std=c++17 -O3
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:6262:38: warning: ‘Iterator’ is deprecated [-Wdeprecated-declarations]
     inline Iterator(const Iterator &o) noexcept;
                                        ^~~~~~~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:6265:49: warning: ‘Iterator’ is deprecated: Use the new DOM navigation API instead (see doc/basics.md) [-Wdeprecated-declarations]
     inline Iterator& operator=(const Iterator&) = delete;
                                                   ^~~~~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:6259:97: note: declared here
   class [[deprecated("Use the new DOM navigation API instead (see doc/basics.md)")]] dom::parser::Iterator {
                                                                                                   ^~~~~~~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:6265:49: warning: ‘Iterator’ is deprecated [-Wdeprecated-declarations]
     inline Iterator& operator=(const Iterator&) = delete;
                                                   ^~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:22965:58: error: ambiguous template specialization ‘get<>’ for ‘simdjson::simdjson_result<simdjson::fallback::ondemand::array> simdjson::fallback::ondemand::document::get() &’
   template<> simdjson_really_inline simdjson_result<array> document::get() & noexcept { return get_array(); }
                                                            ^~~~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20099:66: note: candidates are: template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &
     template<typename T> simdjson_really_inline simdjson_result<T> get() & noexcept {
                                                                    ^~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20105:66: note:                 template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &&
     template<typename T> simdjson_really_inline simdjson_result<T> get() && noexcept {
                                                                    ^~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:22966:59: error: ambiguous template specialization ‘get<>’ for ‘simdjson::simdjson_result<simdjson::fallback::ondemand::object> simdjson::fallback::ondemand::document::get() &’
   template<> simdjson_really_inline simdjson_result<object> document::get() & noexcept { return get_object(); }
                                                             ^~~~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20099:66: note: candidates are: template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &
     template<typename T> simdjson_really_inline simdjson_result<T> get() & noexcept {
                                                                    ^~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20105:66: note:                 template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &&
     template<typename T> simdjson_really_inline simdjson_result<T> get() && noexcept {
                                                                    ^~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:22967:68: error: ambiguous template specialization ‘get<>’ for ‘simdjson::simdjson_result<simdjson::fallback::ondemand::raw_json_string> simdjson::fallback::ondemand::document::get() &’
   template<> simdjson_really_inline simdjson_result<raw_json_string> document::get() & noexcept { return get_raw_json_string(); }
                                                                      ^~~~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20099:66: note: candidates are: template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &
     template<typename T> simdjson_really_inline simdjson_result<T> get() & noexcept {
                                                                    ^~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20105:66: note:                 template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &&
     template<typename T> simdjson_really_inline simdjson_result<T> get() && noexcept {
                                                                    ^~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:22968:69: error: ambiguous template specialization ‘get<>’ for ‘simdjson::simdjson_result<std::basic_string_view<char> > simdjson::fallback::ondemand::document::get() &’
   template<> simdjson_really_inline simdjson_result<std::string_view> document::get() & noexcept { return get_string(); }
                                                                       ^~~~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20099:66: note: candidates are: template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &
     template<typename T> simdjson_really_inline simdjson_result<T> get() & noexcept {
                                                                    ^~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20105:66: note:                 template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &&
     template<typename T> simdjson_really_inline simdjson_result<T> get() && noexcept {
                                                                    ^~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:22969:59: error: ambiguous template specialization ‘get<>’ for ‘simdjson::simdjson_result<double> simdjson::fallback::ondemand::document::get() &’
   template<> simdjson_really_inline simdjson_result<double> document::get() & noexcept { return get_double(); }
                                                             ^~~~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20099:66: note: candidates are: template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &
     template<typename T> simdjson_really_inline simdjson_result<T> get() & noexcept {
                                                                    ^~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20105:66: note:                 template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &&
     template<typename T> simdjson_really_inline simdjson_result<T> get() && noexcept {
                                                                    ^~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:22970:61: error: ambiguous template specialization ‘get<>’ for ‘simdjson::simdjson_result<long unsigned int> simdjson::fallback::ondemand::document::get() &’
   template<> simdjson_really_inline simdjson_result<uint64_t> document::get() & noexcept { return get_uint64(); }
                                                               ^~~~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20099:66: note: candidates are: template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &
     template<typename T> simdjson_really_inline simdjson_result<T> get() & noexcept {
                                                                    ^~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20105:66: note:                 template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &&
     template<typename T> simdjson_really_inline simdjson_result<T> get() && noexcept {
                                                                    ^~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:22971:60: error: ambiguous template specialization ‘get<>’ for ‘simdjson::simdjson_result<long int> simdjson::fallback::ondemand::document::get() &’
   template<> simdjson_really_inline simdjson_result<int64_t> document::get() & noexcept { return get_int64(); }
                                                              ^~~~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20099:66: note: candidates are: template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &
     template<typename T> simdjson_really_inline simdjson_result<T> get() & noexcept {
                                                                    ^~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20105:66: note:                 template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &&
     template<typename T> simdjson_really_inline simdjson_result<T> get() && noexcept {
                                                                    ^~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:22972:57: error: ambiguous template specialization ‘get<>’ for ‘simdjson::simdjson_result<bool> simdjson::fallback::ondemand::document::get() &’
   template<> simdjson_really_inline simdjson_result<bool> document::get() & noexcept { return get_bool(); }
                                                           ^~~~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20099:66: note: candidates are: template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &
     template<typename T> simdjson_really_inline simdjson_result<T> get() & noexcept {
                                                                    ^~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20105:66: note:                 template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &&
     template<typename T> simdjson_really_inline simdjson_result<T> get() && noexcept {
                                                                    ^~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:22974:68: error: ambiguous template specialization ‘get<>’ for ‘simdjson::simdjson_result<simdjson::fallback::ondemand::raw_json_string> simdjson::fallback::ondemand::document::get() &&’
   template<> simdjson_really_inline simdjson_result<raw_json_string> document::get() && noexcept { return get_raw_json_string(); }
                                                                      ^~~~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20099:66: note: candidates are: template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &
     template<typename T> simdjson_really_inline simdjson_result<T> get() & noexcept {
                                                                    ^~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20105:66: note:                 template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &&
     template<typename T> simdjson_really_inline simdjson_result<T> get() && noexcept {
                                                                    ^~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:22975:69: error: ambiguous template specialization ‘get<>’ for ‘simdjson::simdjson_result<std::basic_string_view<char> > simdjson::fallback::ondemand::document::get() &&’
   template<> simdjson_really_inline simdjson_result<std::string_view> document::get() && noexcept { return get_string(); }
                                                                       ^~~~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20099:66: note: candidates are: template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &
     template<typename T> simdjson_really_inline simdjson_result<T> get() & noexcept {
                                                                    ^~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20105:66: note:                 template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &&
     template<typename T> simdjson_really_inline simdjson_result<T> get() && noexcept {
                                                                    ^~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:22976:59: error: ambiguous template specialization ‘get<>’ for ‘simdjson::simdjson_result<double> simdjson::fallback::ondemand::document::get() &&’
   template<> simdjson_really_inline simdjson_result<double> document::get() && noexcept { return std::forward<document>(*this).get_double(); }
                                                             ^~~~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20099:66: note: candidates are: template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &
     template<typename T> simdjson_really_inline simdjson_result<T> get() & noexcept {
                                                                    ^~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20105:66: note:                 template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &&
     template<typename T> simdjson_really_inline simdjson_result<T> get() && noexcept {
                                                                    ^~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:22977:61: error: ambiguous template specialization ‘get<>’ for ‘simdjson::simdjson_result<long unsigned int> simdjson::fallback::ondemand::document::get() &&’
   template<> simdjson_really_inline simdjson_result<uint64_t> document::get() && noexcept { return std::forward<document>(*this).get_uint64(); }
                                                               ^~~~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20099:66: note: candidates are: template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &
     template<typename T> simdjson_really_inline simdjson_result<T> get() & noexcept {
                                                                    ^~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20105:66: note:                 template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &&
     template<typename T> simdjson_really_inline simdjson_result<T> get() && noexcept {
                                                                    ^~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:22978:60: error: ambiguous template specialization ‘get<>’ for ‘simdjson::simdjson_result<long int> simdjson::fallback::ondemand::document::get() &&’
   template<> simdjson_really_inline simdjson_result<int64_t> document::get() && noexcept { return std::forward<document>(*this).get_int64(); }
                                                              ^~~~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20099:66: note: candidates are: template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &
     template<typename T> simdjson_really_inline simdjson_result<T> get() & noexcept {
                                                                    ^~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20105:66: note:                 template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &&
     template<typename T> simdjson_really_inline simdjson_result<T> get() && noexcept {
                                                                    ^~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:22979:57: error: ambiguous template specialization ‘get<>’ for ‘simdjson::simdjson_result<bool> simdjson::fallback::ondemand::document::get() &&’
   template<> simdjson_really_inline simdjson_result<bool> document::get() && noexcept { return std::forward<document>(*this).get_bool(); }
                                                           ^~~~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20099:66: note: candidates are: template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &
     template<typename T> simdjson_really_inline simdjson_result<T> get() & noexcept {
                                                                    ^~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20105:66: note:                 template<class T> simdjson::simdjson_result<T> simdjson::fallback::ondemand::document::get() &&
     template<typename T> simdjson_really_inline simdjson_result<T> get() && noexcept {
                                                                    ^~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:23146:104: error: ambiguous template specialization ‘get<simdjson::fallback::ondemand::document>’ for ‘simdjson::simdjson_result<simdjson::fallback::ondemand::document> simdjson::simdjson_result<simdjson::fallback::ondemand::document>::get() &’
   template<> simdjson_really_inline simdjson_result<SIMDJSON_BUILTIN_IMPLEMENTATION::ondemand::document> simdjson_result<SIMDJSON_BUILTIN_IMPLEMENTATION::ondemand::document>::get<SIMDJSON_BUILTIN_IMPLEMENTATION::ondemand::document>() & noexcept = delete;
                                                                                                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20335:66: note: candidates are: template<class T> simdjson::simdjson_result<T> simdjson::simdjson_result<simdjson::fallback::ondemand::document>::get() &
     template<typename T> simdjson_really_inline simdjson_result<T> get() & noexcept;
                                                                    ^~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20336:66: note:                 template<class T> simdjson::simdjson_result<T> simdjson::simdjson_result<simdjson::fallback::ondemand::document>::get() &&
     template<typename T> simdjson_really_inline simdjson_result<T> get() && noexcept;
                                                                    ^~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:23147:104: error: ambiguous template specialization ‘get<simdjson::fallback::ondemand::document>’ for ‘simdjson::simdjson_result<simdjson::fallback::ondemand::document> simdjson::simdjson_result<simdjson::fallback::ondemand::document>::get() &&’
   template<> simdjson_really_inline simdjson_result<SIMDJSON_BUILTIN_IMPLEMENTATION::ondemand::document> simdjson_result<SIMDJSON_BUILTIN_IMPLEMENTATION::ondemand::document>::get<SIMDJSON_BUILTIN_IMPLEMENTATION::ondemand::document>() && noexcept {
                                                                                                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20335:66: note: candidates are: template<class T> simdjson::simdjson_result<T> simdjson::simdjson_result<simdjson::fallback::ondemand::document>::get() &
     template<typename T> simdjson_really_inline simdjson_result<T> get() & noexcept;
                                                                    ^~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20336:66: note:                 template<class T> simdjson::simdjson_result<T> simdjson::simdjson_result<simdjson::fallback::ondemand::document>::get() &&
     template<typename T> simdjson_really_inline simdjson_result<T> get() && noexcept;
                                                                    ^~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:23151:46: error: ambiguous template specialization ‘get<simdjson::fallback::ondemand::document>’ for ‘simdjson::error_code simdjson::simdjson_result<simdjson::fallback::ondemand::document>::get(simdjson::fallback::ondemand::document&) &’
   template<> simdjson_really_inline error_code simdjson_result<SIMDJSON_BUILTIN_IMPLEMENTATION::ondemand::document>::get<SIMDJSON_BUILTIN_IMPLEMENTATION::ondemand::document>(SIMDJSON_BUILTIN_IMPLEMENTATION::ondemand::document &out) & noexcept = delete;
                                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20338:58: note: candidates are: template<class T> simdjson::error_code simdjson::simdjson_result<simdjson::fallback::ondemand::document>::get(T&) &
     template<typename T> simdjson_really_inline error_code get(T &out) & noexcept;
                                                            ^~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20339:58: note:                 template<class T> simdjson::error_code simdjson::simdjson_result<simdjson::fallback::ondemand::document>::get(T&) &&
     template<typename T> simdjson_really_inline error_code get(T &out) && noexcept;
                                                            ^~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:23152:46: error: ambiguous template specialization ‘get<simdjson::fallback::ondemand::document>’ for ‘simdjson::error_code simdjson::simdjson_result<simdjson::fallback::ondemand::document>::get(simdjson::fallback::ondemand::document&) &&’
   template<> simdjson_really_inline error_code simdjson_result<SIMDJSON_BUILTIN_IMPLEMENTATION::ondemand::document>::get<SIMDJSON_BUILTIN_IMPLEMENTATION::ondemand::document>(SIMDJSON_BUILTIN_IMPLEMENTATION::ondemand::document &out) && noexcept {
                                                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  In file included from cysimdjson/pysimdjson/errors.h:3:0,
                   from cysimdjson/cysimdjson.cpp:668:
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20338:58: note: candidates are: template<class T> simdjson::error_code simdjson::simdjson_result<simdjson::fallback::ondemand::document>::get(T&) &
     template<typename T> simdjson_really_inline error_code get(T &out) & noexcept;
                                                            ^~~
  cysimdjson/pysimdjson/../simdjson/simdjson.h:20339:58: note:                 template<class T> simdjson::error_code simdjson::simdjson_result<simdjson::fallback::ondemand::document>::get(T&) &&
     template<typename T> simdjson_really_inline error_code get(T &out) && noexcept;
                                                            ^~~
  error: command '/usr/local/bin/gcc' failed with exit code 1
  ----------------------------------------
  ERROR: Failed building wheel for cysimdjson
Failed to build cysimdjson
ERROR: Could not build wheels for cysimdjson which use PEP 517 and cannot be installed directly

More wheels?

Wow, is this library ever fast!

Might it be possible to add Windows and Alpine Linux (musllinux) wheels?

Thank you!

Documenting JSON pointer usage?

This seems to do what I expect...

import cysimdjson
parser = cysimdjson.JSONParser()
parser.parse("[1,2,[3]]".encode('utf8')).at_pointer("/2/0")

Might I suggest that it be covered, if only briefly, under the README ?

implement JSONObject.get()

Implementing method get() of JSONObject would make a better dict compatibility.

I'm using this library to import a large GeoJSON. Trying to feed geometry object directly to shapely library gives an exception:

Traceback (most recent call last):
  File "workspace/convert-pa-json.py", line 18, in <module>
    polygon = geometry.shape(feat['geometry']['coordinates'])
  File ".local/lib/python3.9/site-packages/shapely/geometry/geo.py", line 102, in shape
    geom_type = ob.get("type").lower()
AttributeError: 'cysimdjson.JSONArray' object has no attribute 'get'

Create `export` to string or bytes function and expose it via C API

Switch to SIMDJSON OnDemand API

https://github.com/simdjson/simdjson/releases/tag/v0.9.2

Accessing results outside of scope where parser was referenced leads to segfault?

I found this experimentally: is it assumed that access to the results are only valid as long as the parser object lives / is in scope?

I noticed that when I have a function that instantiates the parser and returns the result of the parse output I will regularly get segfaults. This isn't very Python and might need a bigger warning and/or some utilities to assist managing the lifecycle ...

Feature Request: add Typing / Type Stubs support?

Typing stubs can help IDEs and linters generating proper auto-completion and type-checking on the API, which would be helpful when developing.

reference: https://typing.readthedocs.io/en/latest/source/stubs.html
reference: https://typing.readthedocs.io/en/latest/source/writing_stubs.html

Upgrade to simdjson 0.9.2

https://github.com/simdjson/simdjson/releases/tag/v0.9.2

Memory leak

I am observing a memory leak

Part of the code

metadata_parser, gamedata_parser = cysimdjson.JSONParser(), cysimdjson.JSONParser()
with lz4.frame.open(filepath) as file:
  for line in file:
      idx, metadata, gamedata = line.rstrip(b'\n').split(chr(31).encode())
      metadata, gamedata = metadata_parser.parse(metadata), gamedata_parser.parse(gamedata)
      for key, value in gamedata.at_pointer('/0/common').items():
          if key not in test_data['common']:
              test_data['common'][key] = []
          value_type = str(type(value))
          if value_type not in test_data['common'][key]:
              test_data['common'][key].append(value_type)
      for _, player in gamedata.at_pointer('/1').items():
          for key, value in player.items():
              if key not in test_data['player']:
                  test_data['player'][key] = []
              value_type = str(type(value))
              if value_type not in test_data['player'][key]:
                  test_data['player'][key].append(value_type)
      for _, vehicles in gamedata.at_pointer('/0/vehicles').items():
          vehicles = [vehicles] if isinstance(vehicles, dict) else vehicles
          for vehicle in vehicles:
              if isinstance(vehicle, str):
                  continue
              for key, value in vehicle.items():
                  if key not in test_data['vehicle']:
                      test_data['vehicle'][key] = []
                  value_type = str(type(value))
                  if value_type not in test_data['vehicle'][key]:
                      test_data['vehicle'][key].append(value_type)

I am analyzing a large data dump, over 100gb, and memory leaks are preventing the process from completing successfully. The leak is somewhere on the C side of the extension, since profiling the python part didn't show anything. I followed the first manual and ran valgrind

valgrind log

Gist

I can provide more information, just tell me what and how ))

Doesn't work on windows

Hi!
There is no sys.getdlopenflags on winows, so entire package won't work here.

cysimdjson/cysimdjson/__init__.py

Line 7 in 3515a3a

prev = sys.getdlopenflags()

Better to add check for platform, something like sys.platform != 'win32'

Performance comparison from readme seems a bit unfair

Hi!

First of all thanks for this library! This sounds like a very good idea.

However, what I noticed is that since it evaluates fields lazily, comparing it directly to other JSON libraries that provide you with the full dictionary right away is a bit unfair.

Assuming you will use the whole dict anyway, IMHO, a more fair comparison would be with .export() call.

>>> _json_string = '{"a fairly": "expensive", "json": "goes-in", "here": 121}'
>>> timeit(lambda: cysimdjson_parser.parse_string(_json_string).export(), number=100000)
3.6677306999990833
>>> timeit(lambda: orjson_parser.loads(_json_string), number=100000)
2.9754124999963096

Then however, it is slower than orjson.

It gets a lot faster if you will not use the whole dictionary.

>>> timeit(lambda: cysimdjson_parser.loads(_json_string)[7]['revisionNumber'], number=100000)
0.4328116000033333
>>> timeit(lambda: orjson_parser.loads(_json_string)[7]['revisionNumber'], number=100000)
3.0126906000004965

However, in my experience this is rarely the case.

parsing dicts in a list (support a list on top level of a JSON document)

Thanks for the great wrapper, awsome results. I get data which contain dicts in a list, sth like this:

m = b'[{"evl":"Quest","DAY":"Monday","classes":[1,2,6,9],"sub1":10.23,"sub2":-13.123,"sub3":2.01,"hours1":200,"hours2":4000,"date":1607614205,"signature":1},{"evl":"Quest","DAY":"Monday","classes":[1,2,6,9],"sub1":10.23,"sub2":-13.123,"sub3":2.01,"hours1":200,"hours2":4000,"date":1607614205,"signature":1},{"evl":"Quest","DAY":"Monday","classes":[1,2,6,9],"sub1":10.23,"sub2":-13.123,"sub3":2.01,"hours1":200,"hours2":4000,"date":1607614205,"signature":1},]'

Have tried it with cysimdjson.JSONParser() but no success, is there any possible workaround? Thanks..

load to dict is slower than ujson

A big json_file convert python dict, use simdjson.Parser() Object.as_dict().It‘s load speed is slower than ujson.

python ujson loads 1.43 EPS ( 6.30) 67.02 MB/s
pysimdjson parse 1.42 EPS ( 6.36) 66.36 MB/s
python json loads 1.19 EPS ( 7.57) 55.76 MB/s

Installation error

No matter where I try to install it, I get the following error...

$ pip3 install git+https://github.com/TeskaLabs/cysimdjson.git
çCollecting git+https://github.com/TeskaLabs/cysimdjson.git
  Cloning https://github.com/TeskaLabs/cysimdjson.git to /tmp/pip-req-build-p05qbrke
  Running command git clone -q https://github.com/TeskaLabs/cysimdjson.git /tmp/pip-req-build-p05qbrke
  Installing build dependencies ... done
  Getting requirements to build wheel ... error
  ERROR: Command errored out with exit status 1:
   command: /usr/bin/python3 /tmp/tmppry884i2 get_requires_for_build_wheel /tmp/tmpexwmoc4h
       cwd: /tmp/pip-req-build-p05qbrke
  Complete output (39 lines):
  Compiling cysimdjson/cysimdjson.pyx because it changed.
  [1/1] Cythonizing cysimdjson/cysimdjson.pyx
  running egg_info
  creating cysimdjson.egg-info
  writing cysimdjson.egg-info/PKG-INFO
  Traceback (most recent call last):
    File "/tmp/tmppry884i2", line 280, in <module>
      main()
    File "/tmp/tmppry884i2", line 263, in main
      json_out['return_val'] = hook(**hook_input['kwargs'])
    File "/tmp/tmppry884i2", line 114, in get_requires_for_build_wheel
      return hook(config_settings)
    File "/tmp/pip-build-env-ctarly3y/overlay/lib/python3.8/site-packages/setuptools/build_meta.py", line 149, in get_requires_for_build_wheel
      return self._get_build_requires(
    File "/tmp/pip-build-env-ctarly3y/overlay/lib/python3.8/site-packages/setuptools/build_meta.py", line 130, in _get_build_requires
      self.run_setup()
    File "/tmp/pip-build-env-ctarly3y/overlay/lib/python3.8/site-packages/setuptools/build_meta.py", line 253, in run_setup
      super(_BuildMetaLegacyBackend,
    File "/tmp/pip-build-env-ctarly3y/overlay/lib/python3.8/site-packages/setuptools/build_meta.py", line 145, in run_setup
      exec(compile(code, __file__, 'exec'), locals())
    File "setup.py", line 29, in <module>
      setup(
    File "/tmp/pip-build-env-ctarly3y/overlay/lib/python3.8/site-packages/setuptools/__init__.py", line 153, in setup
      return distutils.core.setup(**attrs)
    File "/usr/lib/python3.8/distutils/core.py", line 148, in setup
      dist.run_commands()
    File "/usr/lib/python3.8/distutils/dist.py", line 966, in run_commands
      self.run_command(cmd)
    File "/usr/lib/python3.8/distutils/dist.py", line 985, in run_command
      cmd_obj.run()
    File "/tmp/pip-build-env-ctarly3y/overlay/lib/python3.8/site-packages/setuptools/command/egg_info.py", line 292, in run
      writer(self, ep.name, os.path.join(self.egg_info, ep.name))
    File "/tmp/pip-build-env-ctarly3y/overlay/lib/python3.8/site-packages/setuptools/command/egg_info.py", line 628, in write_pkg_info
      metadata.write_pkg_info(cmd.egg_info)
    File "/usr/lib/python3.8/distutils/dist.py", line 1117, in write_pkg_info
      self.write_pkg_file(pkg_info)
    File "/tmp/pip-build-env-ctarly3y/overlay/lib/python3.8/site-packages/setuptools/dist.py", line 165, in write_pkg_file
      for project_url in self.project_urls.items():
  AttributeError: 'set' object has no attribute 'items'
  ----------------------------------------
ERROR: Command errored out with exit status 1: /usr/bin/python3 /tmp/tmppry884i2 get_requires_for_build_wheel /tmp/tmpexwmoc4h Check the logs for full command output.

Can be reproduced with the following container...

FROM ubuntu:20.10
 RUN apt-get update -qq
 RUN apt-get install -y vim valgrind golang llvm gdb lldb clang-format sudo pip python python-dev wget cmake g++ g++-9 git clang++-9 linux-tools-generic ruby ruby-dev python3-pip  libboost-all-dev git
 RUN  pip3 install ipython

Doesn't build on Windows + MSVC

Installing cysimdjson using pip on Windows with MSVC fails.

It is due to MSVC not understanding the compiler flag -Wno-deprecated when compiling cysimdjson.cpp.

Also, MSVC won't understand -std=c++17 and will ignore the flag (and use C++11). The syntax for MSVC is /std:c++17.

Here is the relevent error log:

  building 'cysimdjson.cysimdjson' extension
  creating build\temp.win-amd64-cpython-37
  creating build\temp.win-amd64-cpython-37\Release
  creating build\temp.win-amd64-cpython-37\Release\cysimdjson
  creating build\temp.win-amd64-cpython-37\Release\cysimdjson\pysimdjson
  creating build\temp.win-amd64-cpython-37\Release\cysimdjson\simdjson
  "C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.31.31103\bin\HostX86\x64\cl.exe" /c /nologo /O2 /W3 /GL /DNDEBUG /MD -Icysimdjson "-IC:\Program Files\Python37\include" "-IC:\Program Files\Python37\Include" "-IC:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.31.31103\ATLMFC\include" "-IC:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.31.31103\include" "-IC:\Program Files (x86)\Windows Kits\10\include\10.0.19041.0\ucrt" "-IC:\Program Files (x86)\Windows Kits\10\\include\10.0.19041.0\\shared" "-IC:\Program Files (x86)\Windows Kits\10\\include\10.0.19041.0\\um" "-IC:\Program Files (x86)\Windows Kits\10\\include\10.0.19041.0\\winrt" "-IC:\Program Files (x86)\Windows Kits\10\\include\10.0.19041.0\\cppwinrt" /EHsc /Tpcysimdjson/cysimdjson.cpp /Fobuild\temp.win-amd64-cpython-37\Release\cysimdjson/cysimdjson.obj -std=c++17 -Wno-deprecated
  cl : command line error D8021 : Invalid numeric argument '/Wno-deprecated'
  error: command 'C:\\Program Files\\Microsoft Visual Studio\\2022\\Community\\VC\\Tools\\MSVC\\14.31.31103\\bin\\HostX86\\x64\\cl.exe' failed with exit code 2
  ----------------------------------------
  ERROR: Failed building wheel for cysimdjson

please add init.py for type check

like orjson, add init.py for type check, otherwise editor can not recognize JSONParser and JSONObject class ···

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