Vista SDK - Python Implementation

The Python implementation of the Vista SDK. For an overview of the SDK and its concepts, see the main README.

📦 Installation

PyPI Installation

pip install vista-sdk --pre

uv add vista-sdk --prerelease allow

Development Installation

# Clone the repository
git clone https://github.com/dnv-opensource/vista-sdk.git
cd vista-sdk/python

# Install with uv (recommended)
uv sync
uv run pre-commit install

# Or install with pip
pip install -e .

🚀 Quick Start

💡 For more complete examples, see the samples directory.

Basic Usage

from vista_sdk.vis import VIS
from vista_sdk.vis_version import VisVersion
from vista_sdk.local_id_builder import LocalIdBuilder
from vista_sdk.codebook_names import CodebookName

# Initialize VIS instance
vis = VIS()

# Get GMOD data for a specific VIS version
gmod = vis.get_gmod(VisVersion.v3_4a)
codebooks = vis.get_codebooks(VisVersion.v3_4a)
locations = vis.get_locations(VisVersion.v3_4a)

# Get a GMOD node by code by lookup
node = gmod["411.1"]
print(f"Node code: {node.code}")
print(f"Node common name: {node.metadata.common_name}")

# Get a GMOD node by try_get
result, node = gmod.try_get_node("411.1")
print(f"Get node result: {result}")
print(f"Node code: {node.code}")
print(f"Node common name: {node.metadata.common_name}")

# Parse a GMOD path
path = gmod.parse_path("411.1/C101.31-2")
print(f"Parsed path: {path}")

# Build a Local ID
# First create metadata tags from codebooks
quantity_tag = codebooks.create_tag(CodebookName.Quantity, "temperature")
content_tag = codebooks.create_tag(CodebookName.Content, "exhaust.gas")
position_tag = codebooks.create_tag(CodebookName.Position, "inlet")

local_id = (LocalIdBuilder.create(VisVersion.v3_4a)
    .with_primary_item(path)
    .with_metadata_tag(quantity_tag)
    .with_metadata_tag(content_tag)
    .with_metadata_tag(position_tag)
    .build())

print(f"Local ID: {local_id}")

Working with Codebooks

from vista_sdk.vis import VIS
from vista_sdk.vis_version import VisVersion
from vista_sdk.codebook_names import CodebookName

vis = VIS()
codebooks = vis.get_codebooks(VisVersion.v3_4a)

# Get a specific codebook
position_codebook = codebooks[CodebookName.Position]

# Create metadata tags
position_tag = position_codebook.create_tag("centre")
quantity_tag = codebooks.create_tag(CodebookName.Quantity, "temperature")

print(f"Position tag: {position_tag}")
print(f"Quantity tag: {quantity_tag}")

# Check if values are valid
print(f"Is 'centre' valid position? {position_codebook.has_standard_value('centre')}")

GMOD Path Operations

from vista_sdk.vis import VIS
from vista_sdk.vis_version import VisVersion

vis = VIS()

gmod = vis.get_gmod(VisVersion.v3_4a)

# Parse a path
path = gmod.parse_path("411.1/C101.31-2")

# Get path information
print(f"Path depth: {len(path)}")
print(f"Node at depth 1: {path.node}")
print(f"Short path string: {str(path)}")
print(f"Full path string: {path.to_full_path_string()}")

# Traverse the path
for depth, node in path.get_full_path():
    print(f"Depth {depth}: {node.code} - {node.metadata.common_name}")

# Get common names context of the path
for depth, common_name in path.get_common_names():
    print(f"Depth {depth}: {common_name}")

Version Conversion

from vista_sdk.vis import VIS
from vista_sdk.vis_version import VisVersion

vis = VIS()

# Convert paths between VIS versions
source_version = VisVersion.v3_4a
target_version = VisVersion.v3_5a

gmod = vis.get_gmod(source_version)
path = gmod.parse_path("411.1/C101.72/I101")

try:
    new_path = vis.convert_path(source_version, path, target_version)
    print(f"Converted path: {path} -> {new_path}")
except Exception as e:
    print(f"Conversion failed: {e}")

📚 Core Components

For a detailed overview of VIS concepts (GMOD, Codebooks, Locations, etc.), see the main README.

VIS (Vessel Information Structure)

The main entry point for accessing VIS data via VIS().

Local ID Builder

Construct standardized local identifiers:

from vista_sdk.vis import VIS
from vista_sdk.vis_version import VisVersion
from vista_sdk.local_id_builder import LocalIdBuilder
from vista_sdk.codebook_names import CodebookName

vis = VIS()
gmod = vis.get_gmod(VisVersion.v3_4a)
codebooks = vis.get_codebooks(VisVersion.v3_4a)

# Create metadata tags
path = gmod.parse_path("411.1/C101.31")
quantity_tag = codebooks.create_tag(CodebookName.Quantity, "temperature")
content_tag = codebooks.create_tag(CodebookName.Content, "cooling.water")
state_tag = codebooks.create_tag(CodebookName.State, "high")

builder = LocalIdBuilder.create(VisVersion.v3_4a)
local_id = (builder
    .with_primary_item(path)
    .with_metadata_tag(quantity_tag)
    .with_metadata_tag(content_tag)
    .with_metadata_tag(state_tag)
    .build())

Builder Pattern Support

The SDK follows a fluent builder pattern:

• with_*() - Add or set values (throws on invalid input)
• try_with_*() - Only applies valid changes; returns builder for chaining
• without_*() - Remove specific components

🔧 Advanced Usage

Parsing Local IDs

from vista_sdk.local_id_builder import LocalIdBuilder

local_id_str = "/dnv-v2/vis-3-4a/411.1/C101.31-2/meta/qty-temperature"

result, _, local_id = LocalIdBuilder.try_parse(local_id_str)
if result:
    print(f"Parsed Local ID: {local_id}")
else:
    print("Failed to parse Local ID")

Working with Different VIS Versions

from vista_sdk.vis import VIS
from vista_sdk.vis_version import VisVersions

vis = VIS()

# Get all available versions
available_versions = VisVersions.all_versions()

# Load data for multiple versions
version_data = {}
for version in available_versions:
    version_data[version] = {
        'gmod': vis.get_gmod(version),
        'codebooks': vis.get_codebooks(version),
        'locations': vis.get_locations(version)
    }

print(f"Loaded data for {len(version_data)} VIS versions")

MQTT Integration

from vista_sdk.mqtt import MqttLocalId
from vista_sdk.local_id_builder import LocalIdBuilder

# Parse a Local ID string
local_id_str = "/dnv-v2/vis-3-4a/411.1/C101.31/meta/qty-temperature"
local_id = LocalIdBuilder.parse(local_id_str)

# Convert to MQTT format
mqtt_id = MqttLocalId(local_id)
print(f"MQTT Topic: {mqtt_id}")  # Uses underscores instead of slashes

🧪 Testing

Running Tests

# Run all tests
uv run pytest

# Run with coverage
uv run pytest --cov=vista_sdk --cov-report=html

# Run specific test categories
uv run pytest tests/test_gmod.py -v
uv run pytest tests/test_local_id.py -v

Running Benchmarks

# Run all benchmarks
python run_benchmarks.py

# Run specific benchmark group
python run_benchmarks.py --group gmod

# Run with memory profiling
python run_benchmarks.py --save-data

📈 Performance

The Python implementation includes comprehensive benchmarks that mirror the C# implementation:

• GMOD Operations: Path parsing, traversal, versioning
• Codebook Lookups: Tag creation and validation
• Local ID Processing: Parsing and building
• Transport: JSON serialization performance

Benchmark Results

See BENCHMARKS.md for comprehensive benchmark results.

🛠️ Development

Setting up Development Environment

# Clone and setup
git clone https://github.com/dnv-opensource/vista-sdk.git
cd vista-sdk/python

# Install development dependencies
uv sync

# Install pre-commit hooks
uv run pre-commit install

# Run tests
uv run pytest

# Run type checking
uv run mypy src/vista_sdk

# Run linting
uv run ruff check src/vista_sdk

Project Structure

python/
├── src/vista_sdk/          # Main package
│   ├── __init__.py         # Public API exports
│   ├── vis.py             # Main VIS class
│   ├── gmod.py            # GMOD implementation
│   ├── codebooks.py       # Codebook handling
│   ├── local_id.py        # Local ID implementation
│   ├── mqtt/              # MQTT-specific modules
│   └── system_text_json/  # JSON serialization
├── tests/                  # Test suite
├── samples/               # Usage examples
└── docs/                  # Additional documentation

🤝 Contributing

1. Fork the repository
2. Create a feature branch (git checkout -b feature/amazing-feature)
3. Make your changes
4. Add tests for new functionality
5. Run the test suite (uv run pytest)
6. Commit your changes (git commit -m 'Add amazing feature')
7. Push to the branch (git push origin feature/amazing-feature)
8. Open a Pull Request

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🔗 Links

• Documentation: docs.vista.dnv.com
• GitHub Repository: vista-sdk
• PyPI Package: vista-sdk
• Issues: GitHub Issues

📞 Support

For questions and support:

• Create an issue on GitHub Issues
• Check the documentation
• Review the samples directory for examples