ASAM ODS EXD-API MDF4 plugin

This repository contains a ASAM ODS EXD-API plugin that uses asammdf to read the ASAM MDF4 files.

This is only a prototype to check if it works with asammdf.

GRPC stub

Because the repository does not contain the ASAM ODS protobuf files the generated stubs are added. The files that match *_pb2* are generated using the following command. To renew them you must put the proto files from the ODS standard into proto_src and rerun the command.

python -m grpc_tools.protoc --proto_path=proto_src --pyi_out=. --python_out=. --grpc_python_out=. ods.proto ods_external_data.proto

Content

Implementation

• exd_api_server.py
  Runs the GRPC service to be accessed using http-2.
• external_data_reader.py
  Implements the EXD-API interface to access MDF4 files using asammdf.

Tests

• test_exd_api.py
  Some basic tests on example files in data folder.
• example_access_exd_api_mdf4.ipynb
  jupyter notebook the shows communication done by ASAM ODS server or Importer using the EXD-API plugin.

Usage in ODS Server

sequenceDiagram

actor CLIENT as Client
participant PDTT as 🛠️Importer
participant PODS as 🗃️ASAM ODS server 
participant PLUGIN as 📊EXD-API plugin
participant FILE as 🗂️File Storage

autonumber

opt Import phase
  FILE ->>+ PDTT: New file shows up
  PDTT ->>+ PLUGIN : Get Structure
  PLUGIN -> FILE: Extract content information
  PLUGIN ->> PLUGIN: Create Structure
  PLUGIN ->>- PDTT: Return Structure
  PDTT ->> PODS: Import ODS structure
  Note right of PDTT: Create hierarchy<br/>AoTest,AoMeasurement,...
  PDTT ->>- PODS: Add External Data info
  Note right of PDTT: Attach AoFile ... for external data<br/>AoFile,AoSubmatrix,AoLocalColumn,...
end

Note over CLIENT, FILE: Now we can work with the imported files

loop Runtime phase
  CLIENT ->> PODS: Establish ODS session
  CLIENT ->> PODS: Work with meta data imported from structure
  CLIENT ->> PODS: Access external channel in preview
  PODS ->> PLUGIN: GetValues
  PLUGIN ->> FILE: Get Channel values
  PLUGIN ->> PODS: Return values of channels
  PODS ->> CLIENT: Return values needed for plot
end

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