Revert D-Bus usage, use systemctl commands only
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- Remove zbus dependency from agent
- Replace D-Bus Connection calls with systemctl show commands
- Fix agent hang by eliminating blocking D-Bus operations
- get_unit_property now uses systemctl show with property flags
- Memory, disk usage, and nginx config queries use systemctl
- Simpler, more reliable service monitoring
This commit is contained in:
Christoffer Martinsson 2025-11-28 12:15:04 +01:00
parent eab3f17428
commit 85c6c624fb
5 changed files with 36 additions and 604 deletions

553
Cargo.lock generated
View File

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[[package]]
name = "zbus"
version = "4.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bb97012beadd29e654708a0fdb4c84bc046f537aecfde2c3ee0a9e4b4d48c725"
dependencies = [
"async-broadcast",
"async-executor",
"async-fs",
"async-io",
"async-lock",
"async-process",
"async-recursion",
"async-task",
"async-trait",
"blocking",
"enumflags2",
"event-listener",
"futures-core",
"futures-sink",
"futures-util",
"hex",
"nix 0.29.0",
"ordered-stream",
"rand",
"serde",
"serde_repr",
"sha1",
"static_assertions",
"tracing",
"uds_windows",
"windows-sys 0.52.0",
"xdg-home",
"zbus_macros",
"zbus_names",
"zvariant",
]
[[package]]
name = "zbus_macros"
version = "4.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "267db9407081e90bbfa46d841d3cbc60f59c0351838c4bc65199ecd79ab1983e"
dependencies = [
"proc-macro-crate",
"proc-macro2",
"quote",
"syn",
"zvariant_utils",
]
[[package]]
name = "zbus_names"
version = "3.0.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "4b9b1fef7d021261cc16cba64c351d291b715febe0fa10dc3a443ac5a5022e6c"
dependencies = [
"serde",
"static_assertions",
"zvariant",
]
[[package]]
name = "zerocopy"
version = "0.8.30"
@ -3666,40 +3166,3 @@ dependencies = [
"system-deps",
"zeromq-src",
]
[[package]]
name = "zvariant"
version = "4.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "2084290ab9a1c471c38fc524945837734fbf124487e105daec2bb57fd48c81fe"
dependencies = [
"endi",
"enumflags2",
"serde",
"static_assertions",
"zvariant_derive",
]
[[package]]
name = "zvariant_derive"
version = "4.2.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "73e2ba546bda683a90652bac4a279bc146adad1386f25379cf73200d2002c449"
dependencies = [
"proc-macro-crate",
"proc-macro2",
"quote",
"syn",
"zvariant_utils",
]
[[package]]
name = "zvariant_utils"
version = "2.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c51bcff7cc3dbb5055396bcf774748c3dab426b4b8659046963523cee4808340"
dependencies = [
"proc-macro2",
"quote",
"syn",
]

View File

@ -1,6 +1,6 @@
[package]
name = "cm-dashboard-agent"
version = "0.1.199"
version = "0.1.200"
edition = "2021"
[dependencies]
@ -31,6 +31,3 @@ libc = "0.2"
# Docker API client
bollard = "0.17"
# D-Bus client for systemd
zbus = "4.0"

View File

@ -7,7 +7,6 @@ use std::time::Instant;
use tracing::{debug, warn};
use bollard::Docker;
use bollard::container::ListContainersOptions;
use zbus::Connection;
use super::{Collector, CollectorError};
use crate::config::SystemdConfig;
@ -376,41 +375,21 @@ impl SystemdCollector {
Ok(("inactive".to_string(), "LoadState=not-found\nActiveState=inactive\nSubState=dead".to_string()))
}
/// Get a unit property via D-Bus
async fn get_unit_property(&self, service_name: &str, property: &str) -> Option<zbus::zvariant::OwnedValue> {
// Connect to system D-Bus
let connection = Connection::system().await.ok()?;
// Get systemd manager proxy
let manager_proxy = zbus::Proxy::new(
&connection,
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
).await.ok()?;
// Get unit path for service
let unit_name = format!("{}.service", service_name);
let unit_path: zbus::zvariant::OwnedObjectPath = manager_proxy
.call("GetUnit", &(unit_name,))
.await
/// Get a unit property via systemctl show
fn get_unit_property(&self, service_name: &str, property: &str) -> Option<String> {
let output = Command::new("systemctl")
.args(&["show", &format!("{}.service", service_name), &format!("--property={}", property)])
.output()
.ok()?;
// Get property using standard D-Bus Properties interface
let prop_proxy = zbus::Proxy::new(
&connection,
"org.freedesktop.systemd1",
unit_path.as_str(),
"org.freedesktop.DBus.Properties",
).await.ok()?;
// Try Service interface first, fallback to Unit interface
// Get returns a Variant, we need to extract the inner value
if let Ok(variant) = prop_proxy.call("Get", &("org.freedesktop.systemd1.Service", property)).await {
return Some(variant);
if !output.status.success() {
return None;
}
prop_proxy.call("Get", &("org.freedesktop.systemd1.Unit", property)).await.ok()
let output_str = String::from_utf8(output.stdout).ok()?;
// Parse "PropertyName=value" format
let value = output_str.trim().strip_prefix(&format!("{}=", property))?;
Some(value.to_string())
}
/// Check if service name matches pattern (supports wildcards like nginx*)
@ -466,15 +445,12 @@ impl SystemdCollector {
return Ok(0.0);
}
// No configured path - try to get WorkingDirectory from D-Bus
if let Some(value) = self.get_unit_property(service_name, "WorkingDirectory").await {
// WorkingDirectory is a string property - try to extract as string
if let Ok(dir_str) = <String>::try_from(value) {
// No configured path - try to get WorkingDirectory from systemctl
if let Some(dir_str) = self.get_unit_property(service_name, "WorkingDirectory") {
if !dir_str.is_empty() && dir_str != "/" && dir_str != "[not set]" {
return Ok(self.get_directory_size(&dir_str).await.unwrap_or(0.0));
}
}
}
Ok(0.0)
}
@ -534,12 +510,12 @@ impl SystemdCollector {
}
}
/// Get memory usage for a specific service via D-Bus
/// Get memory usage for a specific service via systemctl
async fn get_service_memory_usage(&self, service_name: &str) -> Result<f32, CollectorError> {
// Get MemoryCurrent property from D-Bus
if let Some(value) = self.get_unit_property(service_name, "MemoryCurrent").await {
// MemoryCurrent is a u64 property (bytes) - try to extract
if let Ok(memory_bytes) = <u64>::try_from(value) {
// Get MemoryCurrent property from systemctl
if let Some(value_str) = self.get_unit_property(service_name, "MemoryCurrent") {
// MemoryCurrent is in bytes or could be "[not set]"
if let Ok(memory_bytes) = value_str.parse::<u64>() {
return Ok(memory_bytes as f32 / (1024.0 * 1024.0)); // Convert to MB
}
}
@ -629,15 +605,11 @@ impl SystemdCollector {
Some(String::from_utf8_lossy(&output.stdout).to_string())
}
/// Get nginx config from systemd service definition via D-Bus (NixOS compatible)
/// Get nginx config from systemd service definition via systemctl (NixOS compatible)
async fn get_nginx_config_from_systemd(&self) -> Option<String> {
// Get ExecStart property from D-Bus
let value = self.get_unit_property("nginx", "ExecStart").await?;
// ExecStart is a complex structure: array of (path, args, unclean_exit)
// For our purposes, we need to extract the command line
let exec_start_str = format!("{:?}", value);
debug!("nginx ExecStart from D-Bus: {}", exec_start_str);
// Get ExecStart property from systemctl
let exec_start_str = self.get_unit_property("nginx", "ExecStart")?;
debug!("nginx ExecStart from systemctl: {}", exec_start_str);
// Extract config path from ExecStart structure
if let Some(config_path) = self.extract_config_path_from_exec_start(&exec_start_str) {

View File

@ -1,6 +1,6 @@
[package]
name = "cm-dashboard"
version = "0.1.199"
version = "0.1.200"
edition = "2021"
[dependencies]

View File

@ -1,6 +1,6 @@
[package]
name = "cm-dashboard-shared"
version = "0.1.199"
version = "0.1.200"
edition = "2021"
[dependencies]