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</pre></div><pre class="rust"><code><span class="doccomment">//! # system module
//!
//! Handle systemd's overall "system" state. Basically says if we've successfully
//! booted, stated all units or have been asked to stop, be offline etc.

</span><span class="kw">use </span>std::convert::TryInto;
<span class="kw">use </span>std::fmt;
<span class="kw">use </span>std::sync::Arc;

<span class="kw">use </span>anyhow::anyhow;
<span class="kw">use </span>anyhow::Context;
<span class="kw">use </span>int_enum::IntEnum;
<span class="kw">use </span>serde_repr::Deserialize_repr;
<span class="kw">use </span>serde_repr::Serialize_repr;
<span class="kw">use </span>strum_macros::EnumIter;
<span class="kw">use </span>strum_macros::EnumString;
<span class="kw">use </span>thiserror::Error;
<span class="kw">use </span>tokio::sync::RwLock;
<span class="kw">use </span>tracing::error;

<span class="kw">use </span><span class="kw">crate</span>::MachineStats;

<span class="attr">#[derive(Error, Debug)]
</span><span class="kw">pub enum </span>MonitordSystemError {
    <span class="attr">#[error(<span class="string">"monitord::system failed: {0:#}"</span>)]
    </span>GenericError(<span class="attr">#[from] </span>anyhow::Error),
    <span class="attr">#[error(<span class="string">"Unable to connect to DBUS via zbus: {0:#}"</span>)]
    </span>ZbusError(<span class="attr">#[from] </span>zbus::Error),
}

<span class="attr">#[allow(non_camel_case_types)]
#[derive(
    Serialize_repr,
    Deserialize_repr,
    Clone,
    Copy,
    Debug,
    Default,
    Eq,
    PartialEq,
    EnumIter,
    EnumString,
    IntEnum,
    strum_macros::Display,
)]
#[repr(u8)]
</span><span class="kw">pub enum </span>SystemdSystemState {
    <span class="attr">#[default]
    </span>unknown = <span class="number">0</span>,
    initializing = <span class="number">1</span>,
    starting = <span class="number">2</span>,
    running = <span class="number">3</span>,
    degraded = <span class="number">4</span>,
    maintenance = <span class="number">5</span>,
    stopping = <span class="number">6</span>,
    offline = <span class="number">7</span>,
}

<span class="attr">#[derive(serde::Serialize, serde::Deserialize, Clone, Debug, Default, Eq, PartialEq)]
</span><span class="kw">pub struct </span>SystemdVersion {
    major: u32,
    minor: String,
    revision: <span class="prelude-ty">Option</span>&lt;u32&gt;,
    os: String,
}
<span class="kw">impl </span>SystemdVersion {
    <span class="kw">pub fn </span>new(major: u32, minor: String, revision: <span class="prelude-ty">Option</span>&lt;u32&gt;, os: String) -&gt; SystemdVersion {
        <span class="self">Self </span>{
            major,
            minor,
            revision,
            os,
        }
    }
}
<span class="kw">impl </span>fmt::Display <span class="kw">for </span>SystemdVersion {
    <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter) -&gt; fmt::Result {
        <span class="kw">if let </span><span class="prelude-val">Some</span>(revision) = <span class="self">self</span>.revision {
            <span class="kw">return </span><span class="macro">write!</span>(f, <span class="string">"{}.{}.{}.{}"</span>, <span class="self">self</span>.major, <span class="self">self</span>.minor, revision, <span class="self">self</span>.os);
        }
        <span class="macro">write!</span>(f, <span class="string">"{}.{}.{}"</span>, <span class="self">self</span>.major, <span class="self">self</span>.minor, <span class="self">self</span>.os)
    }
}
<span class="kw">impl </span>TryFrom&lt;String&gt; <span class="kw">for </span>SystemdVersion {
    <span class="kw">type </span>Error = MonitordSystemError;

    <span class="kw">fn </span>try_from(s: String) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Error&gt; {
        <span class="kw">let </span>no_v_version = <span class="kw">if let </span><span class="prelude-val">Some</span>(stripped_v) = s.strip_prefix(<span class="string">'v'</span>) {
            stripped_v.to_string()
        } <span class="kw">else </span>{
            s.clone()
        };
        <span class="kw">let </span><span class="kw-2">mut </span>parts = no_v_version.split(<span class="string">'.'</span>);
        <span class="kw">let </span>split_count = parts.clone().count();
        <span class="kw">let </span>major = parts
            .next()
            .with_context(|| <span class="string">"No valid major version"</span>)<span class="question-mark">?
            </span>.parse::&lt;u32&gt;()
            .with_context(|| <span class="macro">format!</span>(<span class="string">"Failed to parse major version: {:?}"</span>, s))<span class="question-mark">?</span>;
        <span class="kw">let </span>minor = parts
            .next()
            .with_context(|| <span class="string">"No valid minor version"</span>)<span class="question-mark">?
            </span>.parse::&lt;String&gt;()
            .with_context(|| <span class="macro">format!</span>(<span class="string">"Failed to parse minor version: {:?}"</span>, s))<span class="question-mark">?</span>;
        <span class="kw">let </span><span class="kw-2">mut </span>revision = <span class="prelude-val">None</span>;
        <span class="kw">if </span>split_count &gt; <span class="number">3 </span>{
            revision = parts.next().and_then(|s| s.parse::&lt;u32&gt;().ok());
        }
        <span class="kw">let </span>remaining_elements: Vec&lt;<span class="kw-2">&amp;</span>str&gt; = parts.collect();
        <span class="kw">let </span>os = remaining_elements.join(<span class="string">"."</span>).to_string();
        <span class="prelude-val">Ok</span>(SystemdVersion {
            major,
            minor,
            revision,
            os,
        })
    }
}

<span class="comment">//pub fn get_system_state(dbus_address: &amp;str) -&gt; Result&lt;SystemdSystemState, dbus::Error&gt; {
</span><span class="kw">pub async fn </span>get_system_state(
    connection: <span class="kw-2">&amp;</span>zbus::Connection,
) -&gt; <span class="prelude-ty">Result</span>&lt;SystemdSystemState, MonitordSystemError&gt; {
    <span class="kw">let </span>p = <span class="kw">crate</span>::dbus::zbus_systemd::ManagerProxy::new(connection)
        .<span class="kw">await
        </span>.map_err(MonitordSystemError::ZbusError)<span class="question-mark">?</span>;

    <span class="kw">let </span>state = <span class="kw">match </span>p.system_state().<span class="kw">await </span>{
        <span class="prelude-val">Ok</span>(system_state) =&gt; <span class="kw">match </span>system_state.as_str() {
            <span class="string">"initializing" </span>=&gt; <span class="kw">crate</span>::system::SystemdSystemState::initializing,
            <span class="string">"starting" </span>=&gt; <span class="kw">crate</span>::system::SystemdSystemState::starting,
            <span class="string">"running" </span>=&gt; <span class="kw">crate</span>::system::SystemdSystemState::running,
            <span class="string">"degraded" </span>=&gt; <span class="kw">crate</span>::system::SystemdSystemState::degraded,
            <span class="string">"maintenance" </span>=&gt; <span class="kw">crate</span>::system::SystemdSystemState::maintenance,
            <span class="string">"stopping" </span>=&gt; <span class="kw">crate</span>::system::SystemdSystemState::stopping,
            <span class="string">"offline" </span>=&gt; <span class="kw">crate</span>::system::SystemdSystemState::offline,
            <span class="kw">_ </span>=&gt; <span class="kw">crate</span>::system::SystemdSystemState::unknown,
        },
        <span class="prelude-val">Err</span>(err) =&gt; {
            <span class="macro">error!</span>(<span class="string">"Failed to get system-state: {:?}"</span>, err);
            <span class="kw">crate</span>::system::SystemdSystemState::unknown
        }
    };
    <span class="prelude-val">Ok</span>(state)
}

<span class="doccomment">/// Async wrapper than can update system stats when passed a locked struct
</span><span class="kw">pub async fn </span>update_system_stats(
    connection: zbus::Connection,
    locked_machine_stats: Arc&lt;RwLock&lt;MachineStats&gt;&gt;,
) -&gt; anyhow::Result&lt;()&gt; {
    <span class="kw">let </span><span class="kw-2">mut </span>machine_stats = locked_machine_stats.write().<span class="kw">await</span>;
    machine_stats.system_state = <span class="kw">crate</span>::system::get_system_state(<span class="kw-2">&amp;</span>connection)
        .<span class="kw">await
        </span>.map_err(|e| <span class="macro">anyhow!</span>(<span class="string">"Error getting system state: {:?}"</span>, e))<span class="question-mark">?</span>;
    <span class="prelude-val">Ok</span>(())
}

<span class="kw">pub async fn </span>get_version(
    connection: <span class="kw-2">&amp;</span>zbus::Connection,
) -&gt; <span class="prelude-ty">Result</span>&lt;SystemdVersion, MonitordSystemError&gt; {
    <span class="kw">let </span>p = <span class="kw">crate</span>::dbus::zbus_systemd::ManagerProxy::new(connection)
        .<span class="kw">await
        </span>.map_err(MonitordSystemError::ZbusError)<span class="question-mark">?</span>;
    <span class="kw">let </span>version_string = p
        .version()
        .<span class="kw">await
        </span>.with_context(|| <span class="string">"Unable to get systemd version string"</span>.to_string())<span class="question-mark">?</span>;
    version_string.try_into()
}

<span class="doccomment">/// Async wrapper than can update system stats when passed a locked struct
</span><span class="kw">pub async fn </span>update_version(
    connection: zbus::Connection,
    locked_machine_stats: Arc&lt;RwLock&lt;MachineStats&gt;&gt;,
) -&gt; anyhow::Result&lt;()&gt; {
    <span class="kw">let </span><span class="kw-2">mut </span>machine_stats = locked_machine_stats.write().<span class="kw">await</span>;
    machine_stats.version = <span class="kw">crate</span>::system::get_version(<span class="kw-2">&amp;</span>connection)
        .<span class="kw">await
        </span>.map_err(|e| <span class="macro">anyhow!</span>(<span class="string">"Error getting systemd version: {:?}"</span>, e))<span class="question-mark">?</span>;
    <span class="prelude-val">Ok</span>(())
}

<span class="attr">#[cfg(test)]
</span><span class="kw">mod </span>tests {
    <span class="kw">use super</span>::<span class="kw-2">*</span>;
    <span class="kw">use </span>anyhow::Result;

    <span class="attr">#[test]
    </span><span class="kw">fn </span>test_display_struct() {
        <span class="macro">assert_eq!</span>(
            <span class="macro">format!</span>(<span class="string">"{}"</span>, SystemdSystemState::running),
            String::from(<span class="string">"running"</span>),
        )
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>test_parsing_systemd_versions() -&gt; <span class="prelude-ty">Result</span>&lt;()&gt; {
        <span class="kw">let </span>parsed: SystemdVersion = <span class="string">"969.1.69.fc69"</span>.to_string().try_into()<span class="question-mark">?</span>;
        <span class="macro">assert_eq!</span>(
            SystemdVersion::new(<span class="number">969</span>, String::from(<span class="string">"1"</span>), <span class="prelude-val">Some</span>(<span class="number">69</span>), String::from(<span class="string">"fc69"</span>)),
            parsed
        );

        <span class="comment">// No revision
        </span><span class="kw">let </span>parsed: SystemdVersion = <span class="string">"969.1.fc69"</span>.to_string().try_into()<span class="question-mark">?</span>;
        <span class="macro">assert_eq!</span>(
            SystemdVersion::new(<span class="number">969</span>, String::from(<span class="string">"1"</span>), <span class="prelude-val">None</span>, String::from(<span class="string">"fc69"</span>)),
            parsed
        );

        <span class="comment">// #bigCompany strings
        </span><span class="kw">let </span>parsed: SystemdVersion = String::from(<span class="string">"969.6-9.9.hs+fb.el9"</span>).try_into()<span class="question-mark">?</span>;
        <span class="macro">assert_eq!</span>(
            SystemdVersion::new(<span class="number">969</span>, String::from(<span class="string">"6-9"</span>), <span class="prelude-val">Some</span>(<span class="number">9</span>), String::from(<span class="string">"hs+fb.el9"</span>)),
            parsed
        );

        <span class="kw">let </span>parsed: SystemdVersion = String::from(<span class="string">"v299.6-9.9.hs+fb.el9"</span>).try_into()<span class="question-mark">?</span>;
        <span class="macro">assert_eq!</span>(
            SystemdVersion::new(<span class="number">299</span>, String::from(<span class="string">"6-9"</span>), <span class="prelude-val">Some</span>(<span class="number">9</span>), String::from(<span class="string">"hs+fb.el9"</span>)),
            parsed
        );

        <span class="prelude-val">Ok</span>(())
    }
}
</code></pre></div></section></main></body></html>