be7f584010
Dynamically supervise a GRPC connection and keep it alive for a while, using a timeout to kill the process on inactivity. The Connection GenServer keeps the connection alive, while listening to a health stream from the GRPC endpoint, notifying any subscribed listeners about changes to health. This health is then propagated to the main servers page. Also create a looping get_sys_info which retrieves some basic system information.
48 lines
1.4 KiB
Elixir
48 lines
1.4 KiB
Elixir
defmodule Prymn.Agents do
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@moduledoc ~S"""
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Prymn Agents are programs that manage a remote client machine. Prymn backend
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communicates with them using GRPC calls. GRPC connections are started using
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the Prymn.Agents.ConnectionSupervisor and are book-kept using the
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Prymn.Agents.Registry.
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"""
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@doc """
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Establishes a dynamically supervised, background connection with the target
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host agent, keeping it alive if it is already started.
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"""
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@spec start_connection_or_keep_alive(String.t()) :: :ok
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def start_connection_or_keep_alive(host_address) do
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spec = {Prymn.Agents.Connection, host_address}
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case DynamicSupervisor.start_child(Prymn.Agents.ConnectionSupervisor, spec) do
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{:error, {:already_started, pid}} ->
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:ok = Prymn.Agents.Connection.keep_alive(pid)
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:ok
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{:ok, _pid} ->
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:ok
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end
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end
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@doc """
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Subscribe to the host's Health using Phoenix.PubSub Broadcasted messages are
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in the form of:
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{host_address, %Prymn.Agents.Health{}}
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## Returns
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This function returns the last health status of the Agent that was saved.
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"""
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@spec subscribe_to_health(String.t()) :: Prymn.Agents.Health.t()
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def subscribe_to_health(host_address) do
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Prymn.Agents.Health.subscribe(host_address)
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Prymn.Agents.Health.lookup(host_address)
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end
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@spec get_channel(String.t()) :: GRPC.Channel.t()
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def get_channel(host_address) do
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Prymn.Agents.Connection.get_channel(host_address)
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end
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end
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