dbl-gateway 0.3.5

DBL Gateway

DBL Gateway

Authoritative DBL and KL gateway. This service is the single writer for append-only trails, applies policy via dbl-policy, and executes via kl-kernel-logic. UI and boundary services consume its snapshots and emit INTENT only.

This release stabilizes the 0.3.x stackline and does not introduce new wire contracts.

Compatible stack versions:

• dbl-core==0.3.2
• dbl-policy==0.2.2
• dbl-main==0.3.1
• kl-kernel-logic==0.5.0

Quickstart (PowerShell)

py -3.11 -m venv .venv
.venv\Scripts\Activate.ps1
python -m pip install -e ".[dev]"

Run the gateway:

dbl-gateway serve --db .\data\trail.sqlite --host 127.0.0.1 --port 8010

Run with uvicorn:

$env:DBL_GATEWAY_DB=".\data\trail.sqlite"
py -3.11 -m uvicorn dbl_gateway.app:app --host 127.0.0.1 --port 8010

Local API docs (OpenAPI)

When the gateway is running, the interactive API docs are available at:

• Swagger UI: http://127.0.0.1:8010/docs
• OpenAPI JSON: http://127.0.0.1:8010/openapi.json

Quick verification:

• Health: http://127.0.0.1:8010/healthz
• Capabilities: http://127.0.0.1:8010/capabilities
• Snapshot (first page): http://127.0.0.1:8010/snapshot?offset=0&limit=50&stream_id=default

Quick probes (PowerShell)

Health:

curl -s "http://127.0.0.1:8010/healthz"

Capabilities:

curl -s "http://127.0.0.1:8010/capabilities"

Snapshot (page through the trail):

curl -s "http://127.0.0.1:8010/snapshot?offset=0&limit=50&stream_id=default"
curl -s "http://127.0.0.1:8010/snapshot?offset=50&limit=50&stream_id=default"

Tail (SSE stream):

curl -N "http://127.0.0.1:8010/tail?since=0&stream_id=default"

Emit an INTENT (example):

$body = @{
  interface_version = 1
  correlation_id = [guid]::NewGuid().ToString()
  payload = @{
    stream_id = "default"
    lane = "ui"
    actor = "dev"
    intent_type = "ui.ping"
    payload = @{ text = "hello" }
  }
} | ConvertTo-Json -Depth 8

curl -s -X POST "http://127.0.0.1:8010/ingress/intent" `
  -H "content-type: application/json" `
  -d $body

Endpoints

Write:

• POST /ingress/intent

Read:

• GET /snapshot
• GET /capabilities
• GET /healthz

Environment contract

See docs/env_contract.md.

Validation against dbl-reference

See docs/validation_workflow.md.

Notes

• The gateway is the only component that performs governance and execution.
• All stabilization is expressed explicitly via DECISION events.
• Boundary and UI clients do not import dbl-core or dbl-policy.
• The gateway uses dbl-core for canonicalization and digest computation.