26ba60b95d
Some work has been done on making the Connection feel nicer, but also more work is needed to not have the channel be exposed to the upper layers of the application. We should wrap all the GRPC calls in the GenServer (which may also allow caching on certain calls such as get_sys_info)
57 lines
1.6 KiB
Elixir
57 lines
1.6 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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alias Prymn.Agents.Connection
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alias Prymn.Agents.Health
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def start_connection(host_address) do
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spec = {Connection, host_address}
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case DynamicSupervisor.start_child(Prymn.Agents.ConnectionSupervisor, spec) do
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{:ok, _pid} -> :ok
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{:error, {:already_started, _pid}} -> :ok
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{:error, error} -> {:error, error}
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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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the Health struct:
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%Prymn.Agents.Health{}
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"""
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def subscribe_to_health(host_address) do
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:ok = Health.subscribe(host_address)
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end
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@doc """
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Return the last known health status of the Agent, or `nil` if it doesn't
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exist.
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"""
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def get_health(host_address) do
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Health.lookup(host_address)
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end
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# TODO: We should not expose this api, instead wrap every GRPC call in this
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# module GRPC is an "internal implementation detail" (although it probably
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# wont ever change)
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#
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# E.g.
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# def get_sys_info(agent) do
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# PrymnProto.Prymn.Agent.Stub.get_sys_info(agent.channel, %Google.Protobuf.Empty{})
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# end
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def get_channel(host_address) do
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with [{pid, _}] <- Registry.lookup(Prymn.Agents.Registry, host_address),
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channel when channel != nil <- Connection.get_channel(pid) do
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{:ok, channel}
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else
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_ -> {:error, :not_found}
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end
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end
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end
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