rspmsg 0.6.3

# What is it?

A python rspmsg module with simplication and modification attached.


# Note:
python version: >=3.6

(For python2.7 version, use rspmsg_version < 0.9, eg: https://github.com/darkdarkfruit/rspmsg/releases/tag/v_0.7.1)


# Rspmsg specification

|--------+--------+-----------+-----------+------------+-------------------------------------------------------|
| Field | type | Required? | Optional? | value | Meaning |
|--------+--------+-----------+-----------+------------+-------------------------------------------------------|
| status | string | * | | "S" or "F" | Is the response successful? |
| code | any | | * | | CODE for application logic(Normally it is an integer) |
| data | any | | * | | Data(payload) of the response |
| desc | any | | * | | Description: normally it's a helping infomation |
| meta | any | | * | | Meta info. eg: servers/ips chain in distributed env. |
| | | | | | |
|--------+--------+-----------+-----------+------------+-------------------------------------------------------|

* Field:status is always in state: "S" or "F"(represents "Successful", "Failed"), no 3th state.

## Decide essage type responded in server side

#### When do we set the message as successful or faild? It varies. Here are some suggestions.
* If the server can reponse with correspondent resource right now, we should mark the message as a 'S' (SUCCESSFUL) message.
* If the server can **NOT** response with correspondent resource right now, we should mark the message as a 'F' (FAILED) message while setting a meaningful code.
* eg1:

rspmsg_successful = {
status : "S",
...
}

* eg2:

# If we want to return a response message to tell client that:
# 1. debug info: the message has flowed to nodes: ["192.168.1.6", "192.168.1.7"]
# 2. Please wait 5 seconds to retry.
# we might response a message like below:
rspmsg_failed = {
status : "F",
code : 100,
data : {
seconds: 5
},
desc : "Server is busy, please wait 5 seconds to continue",
meta : {
nodes: ["192.168.1.6", "192.168.1.7"]
}




# Install:
* pip install rspmsg or (pip3 install rspmsg)
Or
* download the tarbal, decompress it, then run "python setup.py install"

# Test:
# ensure you have the pytest for python3
> pip3 install pytest
> whereis pytest
> pytest: /usr/local/bin/pytest
> pytest --version
> This is pytest version 3.3.2, imported from /usr/local/lib/python3.6/site-packages/pytest.py
>
> pytest rspmsg/

# API: (only 1 class and 2 functions)
* class

* Message
* functions:

* make_successful_message
* make_failed_message

# FAQ
* Why use "S" and "F" to represents "SUCCESSFUL" and "FAILED"? How about 1 or 0, or true or false.


1. "S" and "F" is clear and presentative.
2. 1 or 0? In many programing languages, 1 stands for true, 0 stands for false; while in linux return code,
triditionally, 0 stands for successful-code, non-0(eg:1) stands for error-code.
3. true or false? In interactive envirenment, we might confuse boolean value: (true, false) with string value
("true", "false"), and that will make us misarable in large project.

# Usage: (sample)


Python 3.6.2 (default, Aug 10 2017, 10:07:10)
Type 'copyright', 'credits' or 'license' for more information
IPython 6.1.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: import rspmsg
...:

In [2]: rspmsg.__version__
...:
Out[2]: '0.6.0'

In [3]: msg = rspmsg.make_successful_message(code=0, data={'payload' : 'yes'})
...:

In [4]: msg
Out[4]:
{'code': 0,
'data': {'payload': 'yes'},
'desc': None,
'meta': None,
'status': 'S'}

In [5]: msg.dumps()
Out[5]: '{"status": "S", "code": 0, "data": {"payload": "yes"}, "desc": null, "meta": null}'

In [6]: msg.dumps(skip_none=True)
Out[6]: '{"status": "S", "code": 0, "data": {"payload": "yes"}}'

In [7]: msg_failed = rspmsg.make_failed_message()
...:

In [8]: msg_failed
Out[8]: {'code': None, 'data': None, 'desc': None, 'meta': None, 'status': 'F'}

In [9]: msg_failed.dumps()
Out[9]: '{"status": "F", "code": null, "data": null, "desc": null, "meta": null}'

In [10]: msg_failed.dumps(skip_none=True)
Out[10]: '{"status": "F"}'

In [11]: msg_loaded = rspmsg.Message.loads(msg.dumps())
...:

In [12]: msg_loaded
Out[12]:
{'code': 0,
'data': {'payload': 'yes'},
'desc': None,
'meta': None,
'status': 'S'}

In [13]: msg_loaded.data = 0

In [14]: msg_loaded = rspmsg.Message.loads(msg.dumps())
...:

In [15]: msg_loaded
Out[15]:
{'code': 0,
'data': {'payload': 'yes'},
'desc': None,
'meta': None,
'status': 'S'}

In [16]: msg_loaded.dumps()
Out[16]: '{"status": "S", "code": 0, "data": {"payload": "yes"}, "desc": null, "meta": null}'

In [17]: msg_loaded.dumps(skip_none=True)
Out[17]: '{"status": "S", "code": 0, "data": {"payload": "yes"}}'

In [18]: rspmsg.loads(json.dumps({'status' : 'S', 'code' : 0, 'data' : {'payload' : 'yes'}}))
Out[18]:
{'code': 0,
'data': {'payload': 'yes'},
'desc': None,
'meta': None,
'status': 'S'}