From c97e59308fe8d49f2d5c8f9303ed81e86086c50b Mon Sep 17 00:00:00 2001
From: Young Xu <xuthus5@gmail.com>
Date: Sun, 26 May 2024 16:29:11 +0800
Subject: [PATCH] first commit

---
 .gitignore   |   2 +
 Cargo.lock   | 988 +++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml   |  11 +
 README.md    |  19 +
 rule.yaml    |  17 +
 src/main.rs  | 184 ++++++++++
 src/utils.rs |  21 ++
 7 files changed, 1242 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 README.md
 create mode 100644 rule.yaml
 create mode 100644 src/main.rs
 create mode 100644 src/utils.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ba0ca8d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
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+prometheus.yml
\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..e67d47d
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,988 @@
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..750e976
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "prometheus-agent"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+async-std = "1.12.0"
+serde = { version = "1.0", features = ["derive"] }
+serde_yaml = "0.9.34"
+sha2 = "0.10.8"
+log = "0.4.21"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..3394aac
--- /dev/null
+++ b/README.md
@@ -0,0 +1,19 @@
+## prometheus-agent
+
+> 通过简单的配置，热加载运行prometheus
+
+### 配置文件
+
+```yaml
+- job_name: prometheus # 任务名称
+  type: static # 域名解析方式，可选 static / dns 默认static
+  metrics_path: /metrics # 采集点， 默认 /metrics
+  targets:
+    - svc-mw-prometheus-1:8080
+    - svc-mw-prometheus-2:8080
+- job_name: pulsar
+  type: dns
+  metrics_path: /metrics
+  targets:
+    - svc-mw-pulsar:8080
+```
\ No newline at end of file
diff --git a/rule.yaml b/rule.yaml
new file mode 100644
index 0000000..8085872
--- /dev/null
+++ b/rule.yaml
@@ -0,0 +1,17 @@
+- job_name: prometheus # 任务名称
+  rule_type: static # 域名解析方式，可选 static / dns 默认static
+  metrics_path: /metrics # 采集点， 默认 /metrics
+  targets:
+    - svc-mw-prometheus-1:8080
+    - svc-mw-prometheus-2:8080
+- job_name: prometheus1 # 任务名称
+  rule_type: static # 域名解析方式，可选 static / dns 默认static
+  metrics_path: /metrics # 采集点， 默认 /metrics
+  targets:
+    - svc-mw-prometheus-1:8080
+    - svc-mw-prometheus-2:8080
+- job_name: pulsar
+  rule_type: dns
+  metrics_path: /metrics
+  targets:
+    - svc-mw-pulsar:8080
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..7131fcf
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,184 @@
+use std::fs::{File, OpenOptions};
+use std::io::{Read, Write};
+use std::time::Duration;
+
+use async_std::task;
+use serde::{Deserialize, Serialize};
+use sha2::{Digest, Sha256};
+
+use crate::utils::{get_env, host_port, HostPort};
+
+mod utils;
+
+#[derive(Debug, Serialize, Deserialize)]
+struct Job {
+    job_name: String,
+    rule_type: String,
+    metrics_path: String,
+    targets: Vec<String>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+struct Jobs {
+    jobs: Vec<Job>,
+    hash: String,
+}
+
+impl Jobs {
+    fn new() -> Self {
+        Jobs {
+            jobs: vec![],
+            hash: String::new(),
+        }
+    }
+
+    fn hash(s: String) -> String {
+        let mut hasher = Sha256::new();
+        hasher.update(s);
+        let result = hasher.finalize();
+        let hex_digest = result
+            .iter()
+            .map(|byte| format!("{:02x}", byte))
+            .collect::<String>();
+        return hex_digest;
+    }
+
+    fn load(&mut self) {
+        let mut rule_file = File::open("rule.yaml").unwrap();
+        let mut rule_file_content = String::new();
+        rule_file.read_to_string(&mut rule_file_content).unwrap();
+        let new_hash = Self::hash(rule_file_content.clone());
+        if self.hash == new_hash {
+            println!("配置没有变化");
+            return;
+        }
+        println!("配置变化, 开始刷新配置");
+        // 写入配置文件中
+        let j = serde_yaml::from_str(&*rule_file_content);
+        match j {
+            Err(why) => panic!("unmarshal rule.yaml failed: {:?}", why),
+            Ok(v) => {self.jobs = v }
+        }
+        self.hash = new_hash;
+        // 定义配置文件
+        let mut prometheus = Prometheus::new();
+        let job_iter = self.jobs.iter();
+        for job in job_iter {
+            let mut sc = ScrapeConfig::new(job.job_name.clone(), job.metrics_path.clone());
+            if job.rule_type == "static" {
+                let static_config = StaticConfig {
+                    targets: job.targets.clone(),
+                };
+                sc.static_configs.push(static_config);
+            } else {
+                let target_iter = job.targets.iter();
+                let mut port: u16 = 0;
+                let mut domains: Vec<String> = Vec::new();
+                for ti in target_iter {
+                    let hp = host_port(ti.clone());
+                    match hp {
+                        None => println!("target cant resolve {}", ti),
+                        Some(v) => {
+                            domains.push(v.host);
+                            port = v.port;
+                        }
+                    }
+                }
+                if domains.len() == 0 { continue }
+                let dns_config = DNSConfig {
+                    names: domains,
+                    dns_type: "A".to_string(),
+                    port,
+                    refresh_interval: "10s".to_string(),
+                };
+                sc.dns_sd_configs.push(dns_config);
+            }
+            prometheus.scrape_configs.push(sc);
+        }
+        // 写入文件
+        prometheus.flush();
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+struct Prometheus {
+    global: Global,
+    scrape_configs: Vec<ScrapeConfig>,
+}
+
+impl Prometheus {
+    fn new() -> Prometheus {
+        Prometheus {
+            global: Global {
+                scrape_interval: get_env("SCRAPE_INTERVAL".to_string(), "30s".to_string()),
+                scrape_timeout: get_env("SCRAPE_TIMEOUT".to_string(), "10s".to_string()),
+                evaluation_interval: get_env("EVALUATION_INTERVAL".to_string(), "10s".to_string()),
+            },
+            scrape_configs: Vec::new(),
+        }
+    }
+
+    fn flush(&self) {
+        let y = serde_yaml::to_string(self);
+        let mut file = OpenOptions::new().read(true).write(true).create(true).open("prometheus.yml");
+        file.unwrap().write_all(y.unwrap().as_bytes()).unwrap();
+        println!("写入成功");
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+struct Global {
+    scrape_interval: String,
+    scrape_timeout: String,
+    evaluation_interval: String,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+struct ScrapeConfig {
+    job_name: String,
+    scrape_interval: String,
+    scrape_timeout: String,
+    metrics_path: String,
+    static_configs: Vec<StaticConfig>,
+    dns_sd_configs: Vec<DNSConfig>,
+}
+
+impl ScrapeConfig {
+    fn new(name: String, metrics_path: String) -> ScrapeConfig {
+        ScrapeConfig {
+            job_name: name.to_string(),
+            scrape_interval: "30s".to_string(),
+            scrape_timeout: "10s".to_string(),
+            metrics_path,
+            static_configs: vec![],
+            dns_sd_configs: vec![],
+        }
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+struct StaticConfig {
+    targets: Vec<String>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+struct DNSConfig {
+    names: Vec<String>,
+    dns_type: String,
+    port: u16,
+    refresh_interval: String,
+}
+
+async fn load() {
+    let mut jobs = Jobs::new();
+    let interval = Duration::from_secs(10);
+    loop {
+        task::sleep(interval).await;
+        // 加载配置 检测配置是否变化
+        jobs.load()
+    }
+}
+
+fn main() {
+    task::block_on(load());
+}
diff --git a/src/utils.rs b/src/utils.rs
new file mode 100644
index 0000000..a83e36b
--- /dev/null
+++ b/src/utils.rs
@@ -0,0 +1,21 @@
+use std::env;
+use std::net::ToSocketAddrs;
+
+pub fn get_env(name: String, default_value: String) -> String {
+    return env::var(name).unwrap_or(default_value);
+}
+
+pub struct HostPort {
+    pub(crate) host: String,
+    pub(crate) port: u16,
+}
+
+pub fn host_port(addr: String) -> Option<HostPort> {
+    addr.to_socket_addrs().ok().and_then(|mut addrs| {
+        addrs.next().map(|addr| {
+            let host = addr.ip().to_string();
+            let port = addr.port();
+            HostPort { host, port }
+        })
+    })
+}