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A foundation for building Elixir Phoenix apps — SaaS, social networks, ERP systems, marketplaces, and more
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Files
lib/phoenix_kit/system/dependencies.ex
defmodule PhoenixKit.System.Dependencies do
@moduledoc """
System dependency checker for PhoenixKit.
Probes for required system tools like ImageMagick and FFmpeg.
Results are cached to avoid repeated system calls.
"""
require Logger
# Cache TTL for dependency checks (1 hour)
@cache_ttl 3_600_000
@doc """
Check if ImageMagick is installed and available.
Returns:
- `{:ok, version}` - ImageMagick is installed with version string
- `{:error, :not_installed}` - ImageMagick not found
- `{:error, reason}` - Other error occurred
"""
def check_imagemagick do
case check_command("identify", ["--version"]) do
{:ok, output} ->
# Extract version from output (first line is usually the version)
version =
output
|> String.split("\n")
|> List.first("")
|> String.trim()
{:ok, version}
{:error, :enoent} ->
{:error, :not_installed}
error ->
error
end
rescue
_error -> {:error, :not_installed}
end
@doc """
Check if FFmpeg is installed and available.
Returns:
- `{:ok, version}` - FFmpeg is installed with version string
- `{:error, :not_installed}` - FFmpeg not found
- `{:error, reason}` - Other error occurred
"""
def check_ffmpeg do
case check_command("ffmpeg", ["-version"]) do
{:ok, output} ->
# Extract version from output (first line is usually the version)
version =
output
|> String.split("\n")
|> List.first("")
|> String.trim()
{:ok, version}
{:error, :enoent} ->
{:error, :not_installed}
error ->
error
end
rescue
_error -> {:error, :not_installed}
end
@doc """
Check if ImageMagick is installed (cached version).
Returns the cached result if available, otherwise probes system.
"""
def check_imagemagick_cached do
case get_cached("imagemagick") do
nil ->
result = check_imagemagick()
cache_result("imagemagick", result)
result
cached_result ->
cached_result
end
end
@doc """
Check if FFmpeg is installed (cached version).
Returns the cached result if available, otherwise probes system.
"""
def check_ffmpeg_cached do
case get_cached("ffmpeg") do
nil ->
result = check_ffmpeg()
cache_result("ffmpeg", result)
result
cached_result ->
cached_result
end
end
@doc """
Clear the dependency check cache.
Useful for testing or when you know system dependencies have changed.
"""
def clear_cache do
:persistent_term.erase(:phoenix_kit_deps_imagemagick)
:persistent_term.erase(:phoenix_kit_deps_ffmpeg)
:ok
end
# Private helper to check a system command
defp check_command(command, args) do
case System.cmd(command, args, stderr_to_stdout: true) do
{output, 0} ->
{:ok, output}
{_output, _code} ->
{:error, :command_failed}
end
rescue
e in ErlangError ->
# ErlangError with :enoent means command not found
if e.reason == :enoent do
{:error, :enoent}
else
{:error, "Error checking #{command}: #{inspect(e.reason)}"}
end
error ->
{:error, "Unexpected error: #{inspect(error)}"}
end
# Get cached result with TTL check
defp get_cached(tool) do
cache_key = String.to_atom("phoenix_kit_deps_#{tool}")
case :persistent_term.get(cache_key, nil) do
{timestamp, result} ->
current_time = System.monotonic_time(:millisecond)
if current_time - timestamp < @cache_ttl do
result
else
# Cache expired
:persistent_term.erase(cache_key)
nil
end
_ ->
nil
end
end
# Cache a result with timestamp
defp cache_result(tool, result) do
cache_key = String.to_atom("phoenix_kit_deps_#{tool}")
timestamp = System.monotonic_time(:millisecond)
:persistent_term.put(cache_key, {timestamp, result})
end
end