initial commit

fluxer_metrics/src/config.rs

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+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+use std::env;
+use std::str::FromStr;
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
+pub enum MetricsMode {
+    #[default]
+    ClickHouse,
+    NoOp,
+}
+
+impl FromStr for MetricsMode {
+    type Err = ();
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        match s.to_lowercase().as_str() {
+            "noop" | "no-op" | "no_op" | "none" | "disabled" => Ok(Self::NoOp),
+            "clickhouse" | "ch" | "" => Ok(Self::ClickHouse),
+            _ => Err(()),
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct Config {
+    pub port: u16,
+    pub metrics_mode: MetricsMode,
+    pub clickhouse_url: String,
+    pub clickhouse_database: String,
+    pub clickhouse_user: String,
+    pub clickhouse_password: String,
+    pub alert_webhook_url: Option<String>,
+    pub admin_endpoint: Option<String>,
+}
+
+impl Config {
+    pub fn from_env() -> Result<Self, ConfigError> {
+        let metrics_mode = env::var("METRICS_MODE")
+            .ok()
+            .and_then(|v| v.parse().ok())
+            .unwrap_or_default();
+
+        let clickhouse_url =
+            env::var("CLICKHOUSE_URL").unwrap_or_else(|_| "http://localhost:8123".into());
+        let clickhouse_database =
+            env::var("CLICKHOUSE_DATABASE").unwrap_or_else(|_| "fluxer_metrics".into());
+        let clickhouse_user = env::var("CLICKHOUSE_USER").unwrap_or_else(|_| "default".into());
+        let clickhouse_password = env::var("CLICKHOUSE_PASSWORD").unwrap_or_default();
+
+        if metrics_mode == MetricsMode::ClickHouse && clickhouse_url.is_empty() {
+            return Err(ConfigError::EmptyEnvVar("CLICKHOUSE_URL"));
+        }
+
+        Ok(Self {
+            port: env::var("METRICS_PORT")
+                .ok()
+                .and_then(|p| p.parse().ok())
+                .unwrap_or(8080),
+            metrics_mode,
+            clickhouse_url,
+            clickhouse_database,
+            clickhouse_user,
+            clickhouse_password,
+            alert_webhook_url: env::var("ALERT_WEBHOOK_URL").ok().filter(|s| !s.is_empty()),
+            admin_endpoint: env::var("FLUXER_ADMIN_ENDPOINT")
+                .ok()
+                .filter(|s| !s.is_empty()),
+        })
+    }
+}
+
+#[derive(Debug)]
+pub enum ConfigError {
+    EmptyEnvVar(&'static str),
+}
+
+impl std::fmt::Display for ConfigError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::EmptyEnvVar(var) => {
+                write!(f, "required environment variable {var} is empty")
+            }
+        }
+    }
+}
+
+impl std::error::Error for ConfigError {}