Compare commits
8 Commits
Author | SHA1 | Date |
---|---|---|
Timothée Floure | 31fe677c20 | |
Timothée Floure | b4eb4f524d | |
Timothée Floure | 992ff7f5ef | |
Timothée Floure | fb3338b4d9 | |
Timothée Floure | 884796d50c | |
Timothée Floure | 4a2b6a4948 | |
Timothée Floure | aeb6db4f77 | |
Timothée Floure | 06b52b3b2a |
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@ -4,7 +4,7 @@ name: default
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steps:
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- name: build-release
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image: alpine:latest
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image: alpine:3.15
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environment:
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MIX_ENV: prod
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commands:
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@ -17,7 +17,7 @@ steps:
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- cd _build/prod/rel
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- tar czf "ha-handler-$(git describe --exact-match --tags $(git log -n1 --pretty='%h') || git rev-parse HEAD).tar.gz" ha_handler/
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- name: publish-release-archive
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image: alpine:latest
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image: alpine:3.15
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environment:
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LFTP_PASSWORD:
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from_secret: ssh_password
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12
changelog.md
12
changelog.md
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@ -1,4 +1,14 @@
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# 2022-04-20 - v0.4.0
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# 2022-07-04 - v0.4.2
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* Fix eventual crash on failed DRBD backend.
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* Appsignal: ignore errors on backends (failed PSQL backend currently generate
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errors, and floods appsignal).
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# 2022-06-13 - v0.4.1
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* Fix crash on failed SSHEx / Postgrex connection failure.
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# 2022-06-09 - v0.4.0
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* Add minimal clustering logic.
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* Fix crash on unavailable HAProxy socket.
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@ -1,16 +1,20 @@
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import Config
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config :ha_handler,
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http_port: 4000,
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http_port: 4040,
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acme_challenge_path: "acme-challenge",
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haproxy_socket: System.get_env("HAPROXY_SOCKET") || "/var/run/haproxy.sock",
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handler_instances: [
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:"ha_handler@fenschel",
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:"ha_handler2@fenschel"
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],
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pgsql_instances: [
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[
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hostname: "pgsql.lnth.ch.recycled.cloud",
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username: "postgres",
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database: "postgres",
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haproxy_server: "lnth",
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password: "eicheeR6ieph5jae7oozahf3vesio9Ae",
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password: "secret",
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socket_options: [:inet6],
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ssl: true
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],
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@ -19,7 +23,7 @@ config :ha_handler,
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haproxy_server: "fvil",
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username: "postgres",
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database: "postgres",
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password: "eicheeR6ieph5jae7oozahf3vesio9Ae",
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password: "secret",
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socket_options: [:inet6],
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ssl: true
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]
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@ -27,12 +31,12 @@ config :ha_handler,
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drbd_instances: [
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[
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hostname: "drbd.lnth.ch.recycled.cloud",
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password: "tu9laiz9teece6aithohjohph6eCh3qu",
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password: "secret",
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haproxy_server: "lnth"
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],
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[
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hostname: "drbd.fvil.ch.recycled.cloud",
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password: "tu9laiz9teece6aithohjohph6eCh3qu",
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password: "secret",
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haproxy_server: "fvil"
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]
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]
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@ -42,4 +46,5 @@ config :appsignal, :config,
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otp_app: :ha_handler,
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name: "ha-handler",
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push_api_key: "secret",
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ignore_namespaces: ["pgsql", "drbd"],
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env: config_env()
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@ -1,4 +1,6 @@
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defmodule HAHandler.DRBD do
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require Logger
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@supervisor HAHandler.DRBD.Supervisor
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# There might be >1 resources configured in DRBD!
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@ -18,6 +20,15 @@ defmodule HAHandler.DRBD do
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@id_extraction_regex ~r/\n\s(?<id>\d+)\:\s/
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@data_extraction_regex ~r/cs:(?<cs>(\w|\/)+)\sro:(?<ro>(\w|\/)+)\sds:(?<ds>(\w|\/)+)\s/
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# Empty state, when backend is not queryable for some reason.
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@empty_state %{
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hostname: "unknown",
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version: "",
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mode: "",
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status: "unknown",
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data: ""
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}
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def get_instances() do
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watchers = Supervisor.which_children(@supervisor)
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@ -32,6 +43,8 @@ defmodule HAHandler.DRBD do
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end
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def get_state({hostname, pid}) do
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empty_reply = %{@empty_state | hostname: hostname}
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case GenServer.call(pid, {:execute, @drbd_proc_cmd}) do
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{:ok, raw, 0} ->
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case Regex.named_captures(@block_regex, raw) do
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@ -54,21 +67,25 @@ defmodule HAHandler.DRBD do
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|> Enum.filter(fn r -> r["id"] == @default_resource_id end)
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|> Enum.at(0)
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%{
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hostname: hostname,
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processed_reply = %{
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version: Map.get(version, "full"),
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mode: Map.get(default_resource, "ro"),
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status: Map.get(default_resource, "ds"),
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data: resources
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}
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Map.merge(empty_reply, processed_reply)
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end
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_ ->
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{:error, "could not parse /proc/drbd"}
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Logger.warning("Failed to query DRBD backend: could not parse /proc/drbd.")
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end
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{:ok, _, posix_err} ->
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{:error, posix_err}
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{:error, _err} = reply ->
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reply
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Logger.warning("Failed to query DRBD backend: POSIX #{inspect(posix_err)}.")
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empty_reply
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{:error, err} ->
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Logger.warning("Failed to query DRBD backend: #{inspect(err)}.")
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empty_reply
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end
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end
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end
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@ -17,7 +17,9 @@ defmodule HAHandler.DRBD.Supervisor do
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}
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end)
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opts = [strategy: :one_for_one]
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opts = [
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strategy: :one_for_one
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]
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Supervisor.init(children, opts)
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end
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end
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@ -25,27 +25,52 @@ defmodule HAHandler.DRBD.Watcher do
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@impl true
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def init(opts) do
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hostname = Keyword.get(opts, :hostname)
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password = Keyword.get(opts, :password)
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{:ok, pid} = connect(hostname, password)
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# Configures this worker's jobs to report in the "drbd" namespace
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Appsignal.Span.set_namespace(Appsignal.Tracer.root_span(), "drbd")
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state = %{
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backend: pid,
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hostname: hostname,
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password: password
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backend: nil,
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last_reconnect: nil,
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hostname: Keyword.get(opts, :hostname),
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password: Keyword.get(opts, :password),
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}
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# This action will be processed once the GenServer is fully
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# started/operational. This process handle connection failures by itself,
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# as we don't want to crash loop into supervisor logic (which is only there
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# to handle unexpected failure).
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send self(), :reconnect
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{:ok, state}
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end
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@impl true
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def handle_info(:reconnect, state = %{hostname: hostname, password: password}) do
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case connect(hostname, password) do
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{:ok, pid} ->
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{:noreply, %{state | backend: pid}}
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{:error, _err} ->
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# Nothing to do, as the next request will trigger the reconnect logic
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# (see :execute call).
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{:noreply, state}
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end
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end
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@impl true
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def handle_call({:execute, cmd}, _from, %{backend: backend} = state) do
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case SSHEx.run(backend, cmd) do
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{:ok, _output, _status} = reply->
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{:reply, reply, state}
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{:error, :closed} = reply ->
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# Asynchroneously tries to reopen the connection to the backend.
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send self(), :reconnect
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{:reply, reply, state}
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{:error, _err} = reply ->
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{:error, reply, state}
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# Do not take action on unknown error.
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{:reply, reply, state}
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end
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end
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end
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@ -8,18 +8,27 @@ defmodule HAHandler.PGSQL.Watcher do
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@impl true
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def init(opts) do
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# Configures this worker's jobs to report in the "pgsql" namespace
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Appsignal.Span.set_namespace(Appsignal.Tracer.root_span(), "pgsql")
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# Starts a Postgrex child but does not means the connection was
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# successful.
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# TODO: set dbconnections backoff and connect hooks
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# See https://github.com/elixir-ecto/db_connection/blob/master/lib/db_connection.ex#L343
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{:ok, pid} = Postgrex.start_link(opts)
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case Postgrex.start_link(opts) do
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{:ok, pid} ->
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state = %{
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backend: pid,
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hostname: Keyword.get(opts, :hostname)
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}
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state = %{
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backend: pid,
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hostname: Keyword.get(opts, :hostname)
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}
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{:ok, state}
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{:ok, state}
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{:error, err} ->
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# Will be catched by the supervisor if anything happen. It should not
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# be triggered even if a PGSQL node down, since Postgrex has its own
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# surpervision tree.
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{:error, err}
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end
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end
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@impl true
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