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</pre></div><pre class="rust"><code><span class="kw">use </span>std::path::PathBuf;
<span class="kw">use </span>std::str::FromStr;

<span class="kw">use </span>configparser::ini::Ini;
<span class="kw">use </span>indexmap::map::IndexMap;
<span class="kw">use </span>int_enum::IntEnum;
<span class="kw">use </span>strum_macros::EnumString;
<span class="kw">use </span>tracing::error;

<span class="attr">#[derive(Clone, Debug, Default, EnumString, Eq, IntEnum, PartialEq, strum_macros::Display)]
#[repr(u8)]
</span><span class="kw">pub enum </span>MonitordOutputFormat {
    <span class="attr">#[default]
    #[strum(serialize = <span class="string">"json"</span>, serialize = <span class="string">"JSON"</span>, serialize = <span class="string">"Json"</span>)]
    </span>Json = <span class="number">0</span>,
    <span class="attr">#[strum(
        serialize = <span class="string">"json-flat"</span>,
        serialize = <span class="string">"json_flat"</span>,
        serialize = <span class="string">"jsonflat"
    </span>)]
    </span>JsonFlat = <span class="number">1</span>,
    <span class="attr">#[strum(
        serialize = <span class="string">"json-pretty"</span>,
        serialize = <span class="string">"json_pretty"</span>,
        serialize = <span class="string">"jsonpretty"
    </span>)]
    </span>JsonPretty = <span class="number">2</span>,
}

<span class="attr">#[derive(Clone, Debug, Eq, PartialEq)]
</span><span class="kw">pub struct </span>MonitordConfig {
    <span class="kw">pub </span>dbus_address: String,
    <span class="kw">pub </span>daemon: bool,
    <span class="kw">pub </span>daemon_stats_refresh_secs: u64,
    <span class="kw">pub </span>key_prefix: String,
    <span class="kw">pub </span>output_format: MonitordOutputFormat,
}
<span class="kw">impl </span>Default <span class="kw">for </span>MonitordConfig {
    <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
        MonitordConfig {
            dbus_address: <span class="kw">crate</span>::DEFAULT_DBUS_ADDRESS.into(),
            daemon: <span class="bool-val">false</span>,
            daemon_stats_refresh_secs: <span class="number">30</span>,
            key_prefix: <span class="string">""</span>.to_string(),
            output_format: MonitordOutputFormat::default(),
        }
    }
}

<span class="attr">#[derive(Clone, Debug, Eq, PartialEq)]
</span><span class="kw">pub struct </span>NetworkdConfig {
    <span class="kw">pub </span>enabled: bool,
    <span class="kw">pub </span>link_state_dir: PathBuf,
}
<span class="kw">impl </span>Default <span class="kw">for </span>NetworkdConfig {
    <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
        NetworkdConfig {
            enabled: <span class="bool-val">false</span>,
            link_state_dir: <span class="kw">crate</span>::networkd::NETWORKD_STATE_FILES.into(),
        }
    }
}

<span class="attr">#[derive(Clone, Debug, Eq, PartialEq)]
</span><span class="kw">pub struct </span>Pid1Config {
    <span class="kw">pub </span>enabled: bool,
}
<span class="kw">impl </span>Default <span class="kw">for </span>Pid1Config {
    <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
        Pid1Config { enabled: <span class="bool-val">true </span>}
    }
}

<span class="attr">#[derive(Clone, Debug, Eq, PartialEq)]
</span><span class="kw">pub struct </span>SystemStateConfig {
    <span class="kw">pub </span>enabled: bool,
}
<span class="kw">impl </span>Default <span class="kw">for </span>SystemStateConfig {
    <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
        SystemStateConfig { enabled: <span class="bool-val">true </span>}
    }
}

<span class="attr">#[derive(Clone, Debug, Eq, PartialEq)]
</span><span class="kw">pub struct </span>UnitsConfig {
    <span class="kw">pub </span>enabled: bool,
    <span class="kw">pub </span>state_stats: bool,
    <span class="kw">pub </span>state_stats_allowlist: Vec&lt;String&gt;,
    <span class="kw">pub </span>state_stats_blocklist: Vec&lt;String&gt;,
}
<span class="kw">impl </span>Default <span class="kw">for </span>UnitsConfig {
    <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
        UnitsConfig {
            enabled: <span class="bool-val">true</span>,
            state_stats: <span class="bool-val">false</span>,
            state_stats_allowlist: Vec::new(),
            state_stats_blocklist: Vec::new(),
        }
    }
}

<span class="attr">#[derive(Clone, Debug, Eq, PartialEq)]
</span><span class="kw">pub struct </span>MachinesConfig {
    <span class="kw">pub </span>enabled: bool,
    <span class="kw">pub </span>allowlist: Vec&lt;String&gt;,
    <span class="kw">pub </span>blocklist: Vec&lt;String&gt;,
}
<span class="kw">impl </span>Default <span class="kw">for </span>MachinesConfig {
    <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
        MachinesConfig {
            enabled: <span class="bool-val">true</span>,
            allowlist: Vec::new(),
            blocklist: Vec::new(),
        }
    }
}

<span class="doccomment">/// Config struct
/// Each section represents an ini file section
</span><span class="attr">#[derive(Clone, Debug, Default, Eq, PartialEq)]
</span><span class="kw">pub struct </span>Config {
    <span class="kw">pub </span>machines: MachinesConfig,
    <span class="kw">pub </span>monitord: MonitordConfig,
    <span class="kw">pub </span>networkd: NetworkdConfig,
    <span class="kw">pub </span>pid1: Pid1Config,
    <span class="kw">pub </span>services: Vec&lt;String&gt;,
    <span class="kw">pub </span>system_state: SystemStateConfig,
    <span class="kw">pub </span>units: UnitsConfig,
}

<span class="kw">impl </span>From&lt;Ini&gt; <span class="kw">for </span>Config {
    <span class="kw">fn </span>from(ini_config: Ini) -&gt; <span class="self">Self </span>{
        <span class="kw">let </span><span class="kw-2">mut </span>config = Config::default();

        <span class="comment">// [monitord] section
        </span><span class="kw">if let </span><span class="prelude-val">Some</span>(dbus_address) = ini_config.get(<span class="string">"monitord"</span>, <span class="string">"dbus_address"</span>) {
            config.monitord.dbus_address = dbus_address;
        }
        config.monitord.daemon = read_config_bool(
            <span class="kw-2">&amp;</span>ini_config,
            String::from(<span class="string">"monitord"</span>),
            String::from(<span class="string">"daemon"</span>),
        );
        <span class="kw">if let </span><span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(daemon_stats_refresh_secs)) =
            ini_config.getuint(<span class="string">"monitord"</span>, <span class="string">"daemon_stats_refresh_secs"</span>)
        {
            config.monitord.daemon_stats_refresh_secs = daemon_stats_refresh_secs;
        }
        <span class="kw">if let </span><span class="prelude-val">Some</span>(key_prefix) = ini_config.get(<span class="string">"monitord"</span>, <span class="string">"key_prefix"</span>) {
            config.monitord.key_prefix = key_prefix;
        }
        config.monitord.output_format = MonitordOutputFormat::from_str(
            <span class="kw-2">&amp;</span>ini_config
                .get(<span class="string">"monitord"</span>, <span class="string">"output_format"</span>)
                .expect(<span class="string">"Need 'output_format' set in config"</span>),
        )
        .expect(<span class="string">"Need a valid value for the enum"</span>);

        <span class="comment">// [networkd] section
        </span>config.networkd.enabled = read_config_bool(
            <span class="kw-2">&amp;</span>ini_config,
            String::from(<span class="string">"networkd"</span>),
            String::from(<span class="string">"enabled"</span>),
        );
        <span class="kw">if let </span><span class="prelude-val">Some</span>(link_state_dir) = ini_config.get(<span class="string">"networkd"</span>, <span class="string">"link_state_dir"</span>) {
            config.networkd.link_state_dir = link_state_dir.into();
        }

        <span class="comment">// [pid1] section
        </span>config.pid1.enabled =
            read_config_bool(<span class="kw-2">&amp;</span>ini_config, String::from(<span class="string">"pid1"</span>), String::from(<span class="string">"enabled"</span>));

        <span class="comment">// [services] section
        </span><span class="kw">let </span>config_map = ini_config.get_map().unwrap_or(IndexMap::from([]));
        <span class="kw">if let </span><span class="prelude-val">Some</span>(services) = config_map.get(<span class="string">"services"</span>) {
            config.services = services.keys().map(|s| s.to_string()).collect();
        }

        <span class="comment">// [system-state] section
        </span>config.system_state.enabled = read_config_bool(
            <span class="kw-2">&amp;</span>ini_config,
            String::from(<span class="string">"system-state"</span>),
            String::from(<span class="string">"enabled"</span>),
        );

        <span class="comment">// [units] section
        </span>config.units.enabled =
            read_config_bool(<span class="kw-2">&amp;</span>ini_config, String::from(<span class="string">"units"</span>), String::from(<span class="string">"enabled"</span>));
        config.units.state_stats = read_config_bool(
            <span class="kw-2">&amp;</span>ini_config,
            String::from(<span class="string">"units"</span>),
            String::from(<span class="string">"state_stats"</span>),
        );
        <span class="kw">if let </span><span class="prelude-val">Some</span>(state_stats_allowlist) = config_map.get(<span class="string">"units.state_stats.allowlist"</span>) {
            config.units.state_stats_allowlist = state_stats_allowlist
                .keys()
                .map(|s| s.to_string())
                .collect();
        }
        <span class="kw">if let </span><span class="prelude-val">Some</span>(state_stats_blocklist) = config_map.get(<span class="string">"units.state_stats.blocklist"</span>) {
            config.units.state_stats_blocklist = state_stats_blocklist
                .keys()
                .map(|s| s.to_string())
                .collect();
        }

        <span class="comment">// [machines] section
        </span>config.machines.enabled = read_config_bool(
            <span class="kw-2">&amp;</span>ini_config,
            String::from(<span class="string">"machines"</span>),
            String::from(<span class="string">"enabled"</span>),
        );
        <span class="kw">if let </span><span class="prelude-val">Some</span>(machines_allowlist) = config_map.get(<span class="string">"machines.allowlist"</span>) {
            config.machines.allowlist = machines_allowlist.keys().map(|s| s.to_string()).collect();
        }
        <span class="kw">if let </span><span class="prelude-val">Some</span>(machines_blocklist) = config_map.get(<span class="string">"machines.blocklist"</span>) {
            config.machines.blocklist = machines_blocklist.keys().map(|s| s.to_string()).collect();
        }

        config
    }
}

<span class="doccomment">/// Helper function to read "bool" config options
</span><span class="kw">fn </span>read_config_bool(config: <span class="kw-2">&amp;</span>Ini, section: String, key: String) -&gt; bool {
    <span class="kw">let </span>option_bool = <span class="kw">match </span>config.getbool(<span class="kw-2">&amp;</span>section, <span class="kw-2">&amp;</span>key) {
        <span class="prelude-val">Ok</span>(config_option_bool) =&gt; config_option_bool,
        <span class="prelude-val">Err</span>(err) =&gt; <span class="macro">panic!</span>(
            <span class="string">"Unable to find '{}' key in '{}' section in config file: {}"</span>,
            key, section, err
        ),
    };
    <span class="kw">match </span>option_bool {
        <span class="prelude-val">Some</span>(bool_value) =&gt; bool_value,
        <span class="prelude-val">None </span>=&gt; {
            <span class="macro">error!</span>(
                <span class="string">"No value for '{}' in '{}' section ... assuming false"</span>,
                key, section
            );
            <span class="bool-val">false
        </span>}
    }
}

<span class="attr">#[cfg(test)]
</span><span class="kw">mod </span>tests {
    <span class="kw">use </span>std::io::Write;

    <span class="kw">use </span>tempfile::NamedTempFile;

    <span class="kw">use super</span>::<span class="kw-2">*</span>;

    <span class="kw">const </span>FULL_CONFIG: <span class="kw-2">&amp;</span>str = <span class="string">r###"
[monitord]
dbus_address = unix:path=/system_bus_socket
daemon = true
daemon_stats_refresh_secs = 0
key_prefix = unittest
output_format = json-pretty

[networkd]
enabled = true
link_state_dir = /links

[pid1]
enabled = true

[services]
foo.service
bar.service

[system-state]
enabled = true

[units]
enabled = true
state_stats = true

[units.state_stats.allowlist]
foo.service

[units.state_stats.blocklist]
bar.service

[machines]
enabled = true

[machines.allowlist]
foo
bar

[machines.blocklist]
foo2
"###</span>;

    <span class="kw">const </span>MINIMAL_CONFIG: <span class="kw-2">&amp;</span>str = <span class="string">r###"
[monitord]
output_format = json-flat
"###</span>;

    <span class="attr">#[test]
    </span><span class="kw">fn </span>test_default_config() {
        <span class="macro">assert!</span>(Config::default().units.enabled)
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>test_minimal_config() {
        <span class="kw">let </span><span class="kw-2">mut </span>monitord_config = NamedTempFile::new().expect(<span class="string">"Unable to make named tempfile"</span>);
        monitord_config
            .write_all(MINIMAL_CONFIG.as_bytes())
            .expect(<span class="string">"Unable to write out temp config file"</span>);

        <span class="kw">let </span><span class="kw-2">mut </span>ini_config = Ini::new();
        <span class="kw">let </span>_config_map = ini_config
            .load(monitord_config.path())
            .expect(<span class="string">"Unable to load ini config"</span>);

        <span class="kw">let </span>expected_config: Config = ini_config.into();
        <span class="comment">// See our one setting is not the default 'json' enum value
        </span><span class="macro">assert_eq!</span>(
            expected_config.monitord.output_format,
            MonitordOutputFormat::JsonFlat,
        );
        <span class="comment">// See that one of the enabled bools are false
        </span><span class="macro">assert!</span>(!expected_config.networkd.enabled);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>test_full_config() {
        <span class="kw">let </span>expected_config = Config {
            monitord: MonitordConfig {
                dbus_address: String::from(<span class="string">"unix:path=/system_bus_socket"</span>),
                daemon: <span class="bool-val">true</span>,
                daemon_stats_refresh_secs: u64::MIN,
                key_prefix: String::from(<span class="string">"unittest"</span>),
                output_format: MonitordOutputFormat::JsonPretty,
            },
            networkd: NetworkdConfig {
                enabled: <span class="bool-val">true</span>,
                link_state_dir: <span class="string">"/links"</span>.into(),
            },
            pid1: Pid1Config { enabled: <span class="bool-val">true </span>},
            services: Vec::from([String::from(<span class="string">"foo.service"</span>), String::from(<span class="string">"bar.service"</span>)]),
            system_state: SystemStateConfig { enabled: <span class="bool-val">true </span>},
            units: UnitsConfig {
                enabled: <span class="bool-val">true</span>,
                state_stats: <span class="bool-val">true</span>,
                state_stats_allowlist: Vec::from([String::from(<span class="string">"foo.service"</span>)]),
                state_stats_blocklist: Vec::from([String::from(<span class="string">"bar.service"</span>)]),
            },
            machines: MachinesConfig {
                enabled: <span class="bool-val">true</span>,
                allowlist: Vec::from([String::from(<span class="string">"foo"</span>), String::from(<span class="string">"bar"</span>)]),
                blocklist: Vec::from([String::from(<span class="string">"foo2"</span>)]),
            },
        };

        <span class="kw">let </span><span class="kw-2">mut </span>monitord_config = NamedTempFile::new().expect(<span class="string">"Unable to make named tempfile"</span>);
        monitord_config
            .write_all(FULL_CONFIG.as_bytes())
            .expect(<span class="string">"Unable to write out temp config file"</span>);

        <span class="kw">let </span><span class="kw-2">mut </span>ini_config = Ini::new();
        <span class="kw">let </span>_config_map = ini_config
            .load(monitord_config.path())
            .expect(<span class="string">"Unable to load ini config"</span>);

        <span class="comment">// See everything set / overloaded ...
        </span><span class="macro">assert_eq!</span>(expected_config, ini_config.into(),);
    }
}
</code></pre></div></section></main></body></html>