Vista SDK - Python Implementation

The Vista SDK Python implementation provides comprehensive tools for working with:

• DNV Vessel Information Structure (VIS)
• ISO 19847 - Ships and marine technology — Shipboard data servers to share field data at sea
• ISO 19848 - Ships and marine technology — Standard data for shipboard machinery and equipment

📦 Installation

PyPI Installation

pip install vista-sdk

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.gmod_path import GmodPath
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)

# 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

VIS (Vessel Information Structure)

The main entry point for accessing VIS data:

• GMOD (Generic Product Model) - Function and component hierarchy
• Codebooks - Standardized metadata tags
• Locations - Physical positioning information
• Versioning - Path conversion between VIS versions

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.gmod_path import GmodPath
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_*() - Add values safely (returns success status)
• without_*() - Remove specific components

🔧 Advanced Usage

Custom Error Handling

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, _, _ = LocalIdBuilder.try_parse(local_id_str)
if result is not None:
    print(f"Parsed Local ID: {result}")
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