From 9b56e89c21b2348d1381bc2d48a11eaf563dfa75 Mon Sep 17 00:00:00 2001
From: Hazel Atkinson <yellowsink@riseup.net>
Date: Fri, 4 Apr 2025 15:49:12 +0100
Subject: working docker connection, working prometheus export

---
 Cargo.lock    | 2101 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml    |    7 +
 README.md     |   15 +-
 src/config.rs |   57 ++
 src/main.rs   |   74 +-
 5 files changed, 2251 insertions(+), 3 deletions(-)
 create mode 100644 src/config.rs

diff --git a/Cargo.lock b/Cargo.lock
index 3254d38..0c537ed 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,2107 @@
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+ "windows_i686_msvc 0.52.6",
+ "windows_x86_64_gnu 0.52.6",
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+ "windows_i686_msvc 0.53.0",
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+ "yoke",
+ "zerofrom",
+ "zerovec-derive",
+]
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diff --git a/Cargo.toml b/Cargo.toml
index 6ea38e6..4779392 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,3 +4,10 @@ version = "0.1.0"
 edition = "2021"
 
 [dependencies]
+anyhow = "1.0.97"
+bollard = "0.18.1"
+confique = { version = "0.3.0", features = ["json5"] }
+opentelemetry = { version = "0.29.1", features = ["metrics"] }
+opentelemetry-otlp = { version = "0.29.0", features = ["grpc-tonic"] }
+opentelemetry_sdk = { version = "0.29.0", features = ["metrics"] }
+tokio = { version = "1.44.1", features = ["macros"] }
diff --git a/README.md b/README.md
index 38aa11f..75099b0 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ or a cloud observability platform.
 Note that containerspy currently targets only Docker, not Kubernetes or any other orchestration systems.
 It outputs the same traces as cAdvisor for drop-in compatibility with existing data series and dashboards.
 
-## Why make this?
+## Why make/use this?
 
 ContainerSpy is intended to replace [cAdvisor](https://github.com/google/cadvisor) in a Prometheus/Grafana monitoring
 setup. It takes inspiration from [Beszel](https://www.beszel.dev/) in its approach.
@@ -35,3 +35,16 @@ My motivation to move to a Prometheus/Grafana setup is that I want the centralis
 ## How to set up
 
 TODO: will write once it actually works
+
+## How to configure
+
+| `config.json`   | env var              | description                                                       | default    |
+| --------------- | -------------------- | ----------------------------------------------------------------- | ---------- |
+| `docker_socket` | `CSPY_DOCKER_SOCKET` | The docker socket / named pipe to connect to                      | unset      |
+| `otlp_protocol` | `CSPY_OTLP_PROTO`    | Whether to use httpbinary, httpjson, or grpc to send OTLP metrics | httpbinary |
+
+You can set configuration in the config file specified in the `CSPY_CONFIG` env variable
+(`/etc/containerspy/config.json`) by default, which supports JSON5 syntax, or configure via the `CSPY_` env vars.
+
+If a docker socket path is not set, containerspy will try to connect to
+`/var/run/docker.sock` or `//./pipe/docker_engine` depending on host OS.
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..153c170
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,57 @@
+use std::sync::LazyLock;
+
+use anyhow::Result;
+use confique::Config;
+use opentelemetry_otlp::Protocol;
+
+#[derive(Config)]
+pub struct CspyConfig {
+	#[config(env = "CSPY_DOCKER_SOCKET")]
+	pub docker_socket: Option<String>,
+
+	#[config(env = "CSPY_OTLP_PROTO", default = "httpbinary", deserialize_with = crate::config::deser_protocol)]
+	pub otlp_protocol: Protocol,
+
+	#[config(env = "CSPY_OTLP_ENDPOINT")]
+	pub otlp_endpoint: Option<String>,
+}
+
+pub static CONFIG: LazyLock<CspyConfig> = LazyLock::new(|| {
+	let cfg_loc = std::env::var("CSPY_CONFIG");
+	let cfg_loc = cfg_loc.as_deref().ok().unwrap_or(&"/etc/containerspy/config.json");
+
+	CspyConfig::builder()
+		.env()
+		.file(cfg_loc)
+		.load()
+		.unwrap()
+});
+
+
+/// deserialization boilerplate
+struct ProtoDeserVisitor;
+
+/// deserialization boilerplate
+impl<'de> confique::serde::de::Visitor<'de> for ProtoDeserVisitor {
+	type Value = Protocol;
+
+	fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
+		formatter.write_str(r#""httpbinary", "httpjson", or "grpc"."#)
+	}
+
+	fn visit_str<E>(self, v: &str) -> std::result::Result<Self::Value, E>
+		 where
+			  E: confique::serde::de::Error, {
+		 Ok(match v {
+			"httpbinary" => Protocol::HttpBinary,
+			"httpjson" => Protocol::HttpJson,
+			"grpc" => Protocol::Grpc,
+			&_ => return Err(E::custom(format!("{v} is not a valid OTLP protocol, valid options are httpbinary, httpjson, or grpc.")))
+		})
+	}
+}
+
+/// deserialization boilerplate
+fn deser_protocol<'de, D: confique::serde::Deserializer<'de>>(d: D) -> Result<Protocol, D::Error> {
+	d.deserialize_str(ProtoDeserVisitor)
+}
diff --git a/src/main.rs b/src/main.rs
index e7a11a9..3e1b75c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,73 @@
-fn main() {
-    println!("Hello, world!");
+use std::time::Duration;
+
+use anyhow::Result;
+use bollard::Docker;
+use config::CONFIG;
+use opentelemetry::{metrics::MeterProvider, KeyValue};
+use opentelemetry_otlp::{MetricExporter, Protocol, WithExportConfig};
+use opentelemetry_sdk::{metrics::SdkMeterProvider, Resource};
+
+mod config;
+
+#[tokio::main(flavor = "current_thread")]
+async fn main() -> Result<()> {
+	/* // open a docker connection
+	let docker =
+		if let Some(path) = &CONFIG.docker_socket {
+			Docker::connect_with_socket(path, 60, bollard::API_DEFAULT_VERSION)?
+		}
+		else {
+			Docker::connect_with_local_defaults()?
+		};
+
+	let info = docker.info().await?;
+
+	println!("Connected to Docker Daemon version {:?}", info.server_version); */
+
+	// connect the OTLP exporter
+	let metric_exporter =
+		match CONFIG.otlp_protocol {
+			Protocol::HttpBinary | Protocol::HttpJson => {
+				let builder = MetricExporter::builder().with_http().with_protocol(CONFIG.otlp_protocol);
+				let builder =
+					if let Some(e) = &CONFIG.otlp_endpoint {
+						println!("{e}");
+						builder.with_endpoint(e)
+					} else {
+						builder
+					};
+
+				builder.build()?
+			},
+			Protocol::Grpc => {
+				let builder = MetricExporter::builder().with_tonic().with_protocol(Protocol::Grpc);
+
+				let builder =
+					if let Some(e) = &CONFIG.otlp_endpoint {
+						builder.with_endpoint(e.as_str())
+					} else {
+						builder
+					};
+
+				builder.build()?
+			},
+		};
+
+	//let test_resource = Resource::builder().with_service_name("containerspy").build();
+
+	let meter_provider = SdkMeterProvider::builder()
+	//.with_resource(test_resource)
+		//.with_periodic_exporter(opentelemetry_stdout::MetricExporter::default())
+		.with_periodic_exporter(metric_exporter)
+		.build();
+
+	let m = meter_provider
+		.meter("test_meter")
+		.u64_gauge("testing_gauge")
+		.build();
+
+	m.record(10, &[KeyValue::new("label", 4)]);
+
+
+	Ok(())
 }
-- 
cgit