[PATCH RFC v3 02/11] ti: tools: config: Add board config class to generate config binaries

[Alper Nebi Yasak]

On 15/06/2022 09:47, Neha Malcom Francis wrote:
> For validating config files and generating binary config artifacts, here
> board specific config class is added.
> 
> Add function cfgBinaryGen() in tibcfg_gen.py. It uses TIBoardConfig
> class to load given schema and config files in YAML, validate them and
> generate binaries.
> 
> Signed-off-by: Tarun Sahu <t-sahu at ti.com>
> [n-francis at ti.com: prepared patch for upstreaming]
> Signed-off-by: Neha Malcom Francis <n-francis at ti.com>
> ---
>  test/py/requirements.txt |   1 +
>  tools/tibcfg_gen.py      | 114 +++++++++++++++++++++++++++++++++++++++
>  2 files changed, 115 insertions(+)
>  create mode 100644 tools/tibcfg_gen.py
> 
> diff --git a/test/py/requirements.txt b/test/py/requirements.txt
> index 33c5c0bbc4..a91ba64563 100644
> --- a/test/py/requirements.txt
> +++ b/test/py/requirements.txt
> @@ -4,6 +4,7 @@ coverage==4.5.4
>  extras==1.0.0
>  fixtures==3.0.0
>  importlib-metadata==0.23
> +jsonschema==4.0.0
>  linecache2==1.0.0
>  more-itertools==7.2.0
>  packaging==19.2
> diff --git a/tools/tibcfg_gen.py b/tools/tibcfg_gen.py
> new file mode 100644
> index 0000000000..e5fa2690c8
> --- /dev/null
> +++ b/tools/tibcfg_gen.py
> @@ -0,0 +1,114 @@
> +# SPDX-License-Identifier: GPL-2.0+
> +# Copyright (C) 2022 Texas Instruments Incorporated - https://www.ti.com/
> +#
> +# TI Board Configuration Class for Schema Validation and Binary Generation
> +#
> +
> +import os
> +import getopt
> +import sys
> +
> +import yaml
> +
> +from jsonschema import validate
> +
> +
> +class TIBoardConfig:
> +
> +    """ Texas Instruments Board Configuration File"""
> +
> +    def __init__(self, file, schema, data_rules=""):
> +        """Load a YAML configuration file and YAML schema
> +
> +        Validation of the config file against the schema is also done."""
> +        with open(file, 'r') as f:
> +            self.file_yaml = yaml.safe_load(f)
> +        with open(schema, 'r') as sch:
> +            self.schema_yaml = yaml.safe_load(sch)
> +        self.data_rules = data_rules
> +        try:
> +            validate(self.file_yaml, self.schema_yaml)
> +        except Exception as e:
> +            print(e)

Don't catch the exception here, so that we never have a non-validated
TIBoardConfig object. Instead, catch it in cfgBinaryGen() below to
report the validation error.

> +
> +    def _convert_to_byte_chunk(self, val, data_type):
> +        """Convert value into byte array"""
> +        size = 0
> +        if(data_type == "#/definitions/u8"):
> +            size = 1
> +        elif(data_type == "#/definitions/u16"):
> +            size = 2
> +        elif(data_type == "#/definitions/u32"):
> +            size = 4

Parentheses are unnecessary for these as well.

> +        else:
> +            raise Exception("Data type not present in definitions")
> +        if type(val) == int:
> +            br = val.to_bytes(size, byteorder="little")
> +        return br
> +
> +    def _compile_yaml(self, schema_yaml, file_yaml):
> +        """Convert YAML file into byte array based on YAML schema"""
> +        br = bytearray()
> +        for key in file_yaml.keys():
> +            node = file_yaml[key]
> +            node_schema = schema_yaml['properties'][key]
> +            node_type = node_schema.get('type')
> +            if not 'type' in node_schema:
> +                br += self._convert_to_byte_chunk(node,
> +                                                  node_schema.get('$ref'))
> +            elif node_type == 'object':
> +                br += self._compile_yaml(node_schema, node)
> +            elif node_type == 'array':
> +                for item in node:
> +                    if not isinstance(item, dict):
> +                        br += self._convert_to_byte_chunk(
> +                            item, schema_yaml['properties'][key]['items']["$ref"])
> +                    else:
> +                        br += self._compile_yaml(node_schema.get('items'), item)
> +        return br
> +
> +    def generate_binaries(self, out_path=""):
> +        """Generate config binary artifacts from the loaded YAML configuration file"""
> +        if not os.path.isdir(out_path):
> +            os.mkdir(out_path)
> +        for key in self.file_yaml.keys():
> +            node = self.file_yaml[key]
> +            node_schema = self.schema_yaml['properties'][key]
> +            br = self._compile_yaml(node_schema, node)
> +            path = os.path.join(out_path, key + ".bin")
> +            with open(path, 'wb') as cfg:
> +                cfg.write(br)
> +
> +    def delete_binaries(self, out_path=""):
> +        """Delete generated binaries"""
> +        if os.path.isdir(out_path):
> +            for key in self.file_yaml.keys():
> +                path = os.path.join(out_path, key + ".bin")
> +                if os.path.isfile(path):
> +                    os.remove(path)
> +
> +
> +def cfgBinaryGen():
> +    """Generate config binaries from YAML config file and YAML schema
> +        Arguments:
> +            - config_yaml: board config file in YAML
> +            - schema_yaml: schema file in YAML to validate config_yaml against
> +            - output_dir: output directory where generated binaries can be populated
> +    Pass the arguments along with the filename in the Makefile.
> +    """
> +    opts, args = getopt.getopt(sys.argv[1:], "c:s:o")

I'd prefer argparse, with both long/short forms of arguments and proper
help messages.

> +    for opt, val in opts:
> +        if opt == "-c":
> +            config_yaml = val
> +        elif opt == "-s":
> +            schema_yaml = val
> +        elif opt == "-o":
> +            output_dir = os.path.abspath(val)
> +    try:
> +        tibcfg = TIBoardConfig(config_yaml, schema_yaml)
> +        tibcfg.generate_binaries(output_dir)
> +    except:
> +        raise ValueError("Could not find config files!")
> +
> +
> +cfgBinaryGen()

This needs to be

    if __name__ == "__main__":
        cfgBinaryGen()

or it will be run when anything uses 'import tibcfg_gen' in Python.