rocky-sdk 0.1.4

Typed Python client for the Rocky SQL transformation engine

rocky-sdk

A typed Python client for the Rocky SQL transformation engine.

rocky-sdk wraps the rocky CLI binary (subprocess + --output json) behind a typed RockyClient. Each method builds the right argv, runs the binary, parses the JSON output, and returns a Pydantic model. Failures surface as RockyError subclasses carrying structured fields (exit code, stderr tail, version strings) rather than opaque messages.

It is for human Python callers: notebooks, scripts, and orchestrators. The dagster-rocky integration is a thin Dagster adapter built on this client. For AI agents, use rocky mcp; for a language-agnostic HTTP surface, use rocky serve.

Install

pip install rocky-sdk

The rocky binary is not bundled. Install it separately and put it on $PATH (or pass binary_path=). See the releases page. The SDK requires engine v1.34.0 or newer.

Usage

from rocky_sdk import RockyClient

client = RockyClient(config_path="rocky.toml")

# Read-only inspection — all return typed Pydantic models
result = client.compile()
for diag in result.diagnostics:
    print(diag.severity, diag.message)

lineage = client.lineage("customer_orders", column="email")
catalog = client.catalog()

# Execute a pipeline; stream live progress to a callback
run = client.run(filter="tenant=acme", log_callback=print)
print(run.summary)

Errors

from rocky_sdk import RockyClient
from rocky_sdk.exceptions import RockyVersionError, RockyCommandError, RockyTimeoutError

client = RockyClient(config_path="rocky.toml", timeout_seconds=600)
try:
    client.run(filter="tenant=acme")
except RockyTimeoutError as exc:
    print("timed out after", exc.timeout_seconds, "s")
    print(exc.stderr_tail)
except RockyCommandError as exc:
    print("exit", exc.returncode)
    print(exc.stderr_tail)

RockyError is the base of the hierarchy:

Exception	Raised when
RockyBinaryNotFoundError	the rocky binary is missing
RockyVersionError	the binary is older than the SDK's minimum
RockyTimeoutError	a command exceeds timeout_seconds
RockyCommandError	a command exits non-zero
RockyPartialFailure	a non-zero run still returned a parseable partial result (only with allow_partial=False)
RockyOutputParseError	stdout was not the expected JSON shape
RockyServerError	a rocky serve HTTP request failed
RockyGovernanceError	a governance_override would silently full-revoke

Example

A runnable end-to-end script lives at examples/quickstart.py. With the rocky binary on your PATH:

python examples/quickstart.py

It spins up a throwaway DuckDB playground (no credentials) and walks through compile, DAG, lineage, a real run, and typed error handling.

License

Apache-2.0