dp-frontend-dataset-controller

An HTTP service for the controlling of data and rendering templates relevant to a particular dataset.

Configuration

Environment variable	Default	Description
API_ROUTER_URL	http://localhost:23200/v1	The URL of the dp-api-router
BIND_ADDR	:20200	The host and port to bind to.
CACHE_NAVIGATION_UPDATE_INTERVAL	10s	How often the navigation cache is updated
DEBUG	false	Enable debug mode
DOWNLOAD_SERVICE_URL	http://localhost:23600	The URL of dp-download-service.
ENABLE_MULTIVARIATE	false	Enable 2021 multivariate datasets
ENABLE_NEW_NAV_BAR	false	Enable new nav bar
ENABLE_PROFILER	false	Flag to enable go profiler
FEEDBACK_API_URL	http://localhost:23200/v1/feedback	The public dp-api-router address for feedback, not the internal one
GRACEFUL_SHUTDOWN_TIMEOUT	5s	The graceful shutdown timeout in seconds
HEALTHCHECK_CRITICAL_TIMEOUT	90s	The time taken for the health changes from warning state to critical due to subsystem check failures
HEALTHCHECK_INTERVAL	30s	The time between calling healthcheck endpoints for check subsystems
OTEL_BATCH_TIMEOUT	5s	Interval between pushes to OT Collector
OTEL_EXPORTER_OTLP_ENDPOINT	http://localhost:4317	URL for OpenTelemetry endpoint
OTEL_SERVICE_NAME	"dp-frontend-dataset-controller"	Service name to report to telemetry tools
OTEL_ENABLED	false	Feature flag to enable OpenTelemetry
PATTERN_LIBRARY_ASSETS_PATH	""	Pattern library location
PPROF_TOKEN	""	The profiling token to access service profiling
SITE_DOMAIN	localhost
SUPPORTED_LANGUAGES	[]string{"en", "cy"}	Supported languages

Profiling

An optional /debug endpoint has been added, in order to profile this service via pprof go library. In order to use this endpoint, you will need to enable profiler flag and set a PPROF_TOKEN:

export ENABLE_PROFILER=true
export PPROF_TOKEN={generated uuid}

Then you can us the profiler as follows:

1- Start service, load test or if on environment wait for a number of requests to be made.

2- Send authenticated request and store response in a file (this can be best done in command line like so: curl <host>:<port>/debug/pprof/heap -H "Authorization: Bearer {generated uuid} > heap.out - see pprof documentation on other endpoints

3- View profile either using a web ui to navigate data (a) or using pprof on command line to navigate data (b) a) go tool pprof -http=:8080 heap.out b) go tool pprof heap.out, -o flag to see various options

Licence

Copyright © 2025, Office for National Statistics (https://www.ons.gov.uk)

Released under MIT license, see LICENSE for details.