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commit:ba0b2399a86334428adb186ca469e04466b1e69a
author:Chip Black
committer:Chip Black
date:Mon Jun 19 23:23:06 2023 -0500
parents:d02a6222f22a25ebd879f8f96847f939e20c0005
Working version

This collects usage and available space stats for all datasets
in all pools.

diff --git a/.gitignore b/.gitignore
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index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
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index 0000000..efa978e
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+ "cfg-if",
+ "wasm-bindgen-macro",
+]
+
+[[package]]
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+ "bumpalo",
+ "log",
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.18",
+ "wasm-bindgen-shared",
+]
+
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+]
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+ "proc-macro2",
+ "quote",
+ "syn 2.0.18",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
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+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
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+ "windows-targets",
+]
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+ "windows-targets",
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+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
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+
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+name = "winnow"
+version = "0.4.7"
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+checksum = "ca0ace3845f0d96209f0375e6d367e3eb87eb65d27d445bdc9f1843a26f39448"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "yansi"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09041cd90cf85f7f8b2df60c646f853b7f535ce68f85244eb6731cf89fa498ec"
+
+[[package]]
+name = "zfs-exporter"
+version = "0.1.0"
+dependencies = [
+ "libzetta",
+ "prometheus-client",
+ "rocket",
+]


diff --git a/Cargo.toml b/Cargo.toml
line changes: +11/-0
index 0000000..9f75868
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "zfs-exporter"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+prometheus-client = "0.21.1"
+rocket = "=0.5.0-rc.3"
+libzetta = "0.5.0"


diff --git a/Makefile b/Makefile
line changes: +13/-0
index 0000000..eb0de1c
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,13 @@
+BINARY = zfs-exporter
+BUILD := release
+
+.PHONY: install
+install: target/$(BUILD)/$(BINARY)
+	install -m755 target/$(BUILD)/$(BINARY) /usr/local/bin/$(BINARY)
+	install -m755 rc.d/zfs-exporter /usr/local/etc/rc.d/zfs-exporter
+
+target/release/$(BINARY):
+	cargo build --release
+
+target/debug/$(BINARY):
+	cargo build


diff --git a/README.md b/README.md
line changes: +23/-0
index 0000000..f57a967
--- /dev/null
+++ b/README.md
@@ -0,0 +1,23 @@
+# zfs-exporter
+
+`zfs-exporter` is a prometheus exporter for ZFS space usage statistics.
+
+## Status
+
+This is a hack I threw together to make my life easier. It will probably
+break with the next FreeBSD release. I might not maintain it. I guess in
+theory this might work on Linux with ZFS patches but I haven't tried it.
+
+## Usage
+
+Compile the release version with `cargo build --release`. `make install`
+will install the binary and rc file to /usr/local. Enable it with `sysrc
+zfs_exporter_enable=YES`, and start it with `service zfs-exporter
+start`. See the rc file for configurables.
+
+## Metrics
+
+Currently it only exports two metrics, `zfs_dataset_space_used` and
+`zfs_dataset_space_available`. Each one is labeled with `pool`, which is
+the pool the dataset belongs to; and `dataset`, which is the dataset
+name.


diff --git a/rc.d/zfs-exporter b/rc.d/zfs-exporter
line changes: +61/-0
index 0000000..c4f911a
--- /dev/null
+++ b/rc.d/zfs-exporter
@@ -0,0 +1,61 @@
+#!/bin/sh
+
+# PROVIDE: zfs_exporter
+# REQUIRE: LOGIN
+# KEYWORD: shutdown
+#
+# Add the following lines to /etc/rc.conf.local or /etc/rc.conf
+# to enable this service:
+#
+# zfs_exporter_enable (bool):          Set to NO by default.
+#               Set it to YES to enable zfs_exporter.
+# zfs_exporter_user (string):          Set user that zfs_exporter will run under
+#               Default is "nobody".
+# zfs_exporter_group (string):         Set group that zfs_exporter will run under
+#               Default is "nobody".
+# zfs_exporter_args (string):          Set extra arguments to pass to zfs_exporter
+#               Default is "".
+# zfs_exporter_listen_address (string):Set ip:port that zfs_exporter will listen on
+#               Default is "0.0.0.0:9145".
+
+. /etc/rc.subr
+
+name=zfs_exporter
+rcvar=zfs_exporter_enable
+
+load_rc_config $name
+
+: ${zfs_exporter_enable:="NO"}
+: ${zfs_exporter_user:="nobody"}
+: ${zfs_exporter_group:="nobody"}
+: ${zfs_exporter_args:=""}
+: ${zfs_exporter_listen_address:="0.0.0.0:9145"}
+: ${zfs_exporter_textfile_dir:="/var/tmp/zfs_exporter"}
+
+
+pidfile=/var/run/zfs_exporter.pid
+command="/usr/sbin/daemon"
+procname="/usr/local/bin/zfs-exporter"
+address=$(echo $zfs_exporter_listen_address | cut -d: -f1)
+port=$(echo $zfs_exporter_listen_address | cut -d: -f2)
+command_args="-f -p ${pidfile} -T ${name} \
+    /usr/bin/env ROCKET_address=${address} ROCKET_port=${port} \
+    ${procname} \
+    --listen-address=${zfs_exporter_listen_address} \
+    --exporter.textfile.directory=${zfs_exporter_textfile_dir} \
+    ${zfs_exporter_args}"
+
+start_precmd=zfs_exporter_startprecmd
+
+zfs_exporter_startprecmd()
+{
+    if [ ! -e ${pidfile} ]; then
+        install \
+            -o ${zfs_exporter_user} \
+            -g ${zfs_exporter_group} \
+            /dev/null ${pidfile};
+    fi
+}
+
+load_rc_config $name
+run_rc_command "$1"


diff --git a/src/main.rs b/src/main.rs
line changes: +123/-0
index 0000000..a9a65fd
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,123 @@
+use std::collections::BTreeMap;
+use std::thread;
+use std::time;
+
+use prometheus_client::encoding::text::encode;
+use prometheus_client::encoding::EncodeLabelSet;
+use prometheus_client::metrics::family::Family;
+use prometheus_client::metrics::gauge::Gauge;
+use prometheus_client::registry::Registry;
+#[macro_use]
+extern crate rocket;
+use libzetta::zfs::{Properties, ZfsEngine, ZfsOpen3};
+use libzetta::zpool::{open3::StatusOptions, ZpoolEngine, ZpoolOpen3};
+use rocket::State;
+
+#[derive(Clone, Debug, Hash, PartialEq, Eq, EncodeLabelSet)]
+struct Labels {
+    pool: String,
+    dataset: String,
+}
+
+type FsMetric = Family<Labels, Gauge>;
+
+struct Data {
+    used: FsMetric,
+    available: FsMetric,
+}
+
+#[derive(Responder)]
+#[response(
+    status = 200,
+    content_type = "application/openmetrics-text; version=1.0.0; charset=utf-8"
+)]
+struct OpenMetrics(String);
+
+#[get("/metrics")]
+fn metrics(registry: &State<Registry>) -> OpenMetrics {
+    let mut encoded = String::new();
+    encode(&mut encoded, registry).expect("encoded");
+
+    OpenMetrics(encoded)
+}
+
+fn init_registry(registry: &mut Registry) -> BTreeMap<String, Data> {
+    let mut fsdata = BTreeMap::new();
+    let zpool = ZpoolOpen3::default();
+    let zfs = ZfsOpen3::new();
+
+    let pools = zpool
+        .status_all(StatusOptions::default())
+        .expect("zpool status_all");
+    for p in pools {
+        let pool = p.name();
+        let filesystems = zfs.list_filesystems(pool).expect("zfs");
+        for fs in filesystems {
+            let dataset = fs.display().to_string();
+
+            let used = Family::<Labels, Gauge>::default();
+            registry.register(
+                "zfs_dataset_space_used",
+                "space used by the dataset",
+                used.clone(),
+            );
+
+            let available = Family::<Labels, Gauge>::default();
+            registry.register(
+                "zfs_dataset_space_available",
+                "space available to the dataset",
+                available.clone(),
+            );
+            fsdata.insert(dataset, Data { used, available });
+        }
+    }
+
+    fsdata
+}
+
+fn collect_data(fsdata: &BTreeMap<String, Data>) {
+    let zpool = ZpoolOpen3::default();
+    let zfs = ZfsOpen3::new();
+
+    let pools = zpool
+        .status_all(StatusOptions::default())
+        .expect("zpool status_all");
+    for p in pools {
+        let pool = p.name();
+        let filesystems = zfs.list_filesystems(pool).expect("zfs");
+        for fs in filesystems {
+            let dataset = fs.display().to_string();
+            let properties = zfs.read_properties(fs).expect("zfs properties");
+            let filesystem_properties = match properties {
+                Properties::Filesystem(fsp) => fsp,
+                _ => unreachable!(),
+            };
+            let data = fsdata.get(&dataset).expect("fsdata get");
+            let labels = Labels { pool: pool.to_owned(), dataset };
+            data.used
+                .get_or_create(&labels)
+                .set(*filesystem_properties.used_by_dataset() as i64);
+            data.available
+                .get_or_create(&labels)
+                .set(*filesystem_properties.available());
+        }
+    }
+}
+
+#[launch]
+fn rocket() -> _ {
+    let mut registry = <Registry>::default();
+
+    let fsdata = init_registry(&mut registry);
+
+    thread::spawn(move || {
+        loop {
+            collect_data(&fsdata);
+            thread::sleep(time::Duration::from_secs(60));
+        }
+    });
+
+    rocket::build()
+        .manage(registry)
+        .mount("/", routes![metrics])
+}

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