Graham McIntire
9fcf19b304
- Read DEPLOY_TIMESTAMP environment variable for actual deploy time - Fall back to compile time in development when env var not set - Add Kubernetes Downward API to inject metadata.creationTimestamp - Update k8s/deployment.yaml to set DEPLOY_TIMESTAMP env var - Document deployment timestamp mechanism in k8s/README.md This ensures the footer shows when the pod was deployed to the cluster, not when the Docker image was built in CI/CD.
89 lines
2.6 KiB
Elixir
89 lines
2.6 KiB
Elixir
defmodule Towerops.Application do
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# See https://hexdocs.pm/elixir/Application.html
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# for more information on OTP Applications
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@moduledoc false
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use Application
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# Capture the build timestamp at compile time (fallback for development)
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@build_timestamp DateTime.utc_now()
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@impl true
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def start(_type, _args) do
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# Run migrations on startup (Ecto handles locking for concurrent runs)
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_ =
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if Application.get_env(:towerops, Towerops.Repo)[:database] != "towerops_test" do
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Towerops.Release.migrate()
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end
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topologies = Application.get_env(:libcluster, :topologies, [])
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children = [
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{Cluster.Supervisor, [topologies, [name: Towerops.ClusterSupervisor]]},
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ToweropsWeb.Telemetry,
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Towerops.Repo,
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{DNSCluster, query: Application.get_env(:towerops, :dns_cluster_query) || :ignore},
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{Phoenix.PubSub, name: Towerops.PubSub},
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# Start event logger (subscribes to PubSub)
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Towerops.Equipment.EventLogger,
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# Start monitoring supervisor
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Towerops.Monitoring.Supervisor,
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# Start a worker by calling: Towerops.Worker.start_link(arg)
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# {Towerops.Worker, arg},
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# Start to serve requests, typically the last entry
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ToweropsWeb.Endpoint
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]
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# See https://hexdocs.pm/elixir/Supervisor.html
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# for other strategies and supported options
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opts = [strategy: :one_for_one, name: Towerops.Supervisor]
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Supervisor.start_link(children, opts)
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end
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# Tell Phoenix to update the endpoint configuration
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# whenever the application is updated.
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@impl true
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def config_change(changed, _new, removed) do
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ToweropsWeb.Endpoint.config_change(changed, removed)
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:ok
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end
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@doc """
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Returns the deployment timestamp.
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In production (Kubernetes), this reads from the DEPLOY_TIMESTAMP environment
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variable which should be set during deployment. Falls back to compile time
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in development.
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Set DEPLOY_TIMESTAMP in your Kubernetes deployment:
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```yaml
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env:
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- name: DEPLOY_TIMESTAMP
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value: "2026-01-17T12:34:56Z"
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```
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Or use a downward API to inject the pod creation time:
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```yaml
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env:
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- name: DEPLOY_TIMESTAMP
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valueFrom:
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fieldRef:
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fieldPath: metadata.creationTimestamp
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```
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"""
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@spec build_timestamp() :: DateTime.t()
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def build_timestamp do
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case System.get_env("DEPLOY_TIMESTAMP") do
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nil ->
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# Development/fallback: use compile time
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@build_timestamp
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timestamp_string ->
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# Production: parse from environment variable
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case DateTime.from_iso8601(timestamp_string) do
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{:ok, datetime, _offset} -> datetime
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{:error, _} -> @build_timestamp
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end
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end
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end
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end
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