Add json logging via tracing_subscriber

Cargo.toml

@@ -12,7 +12,6 @@ anyhow = "1.0"
 async-trait = "0.1"
 clap = { version = "4.4", features = ["derive"] }
 dashmap = { version = "5.5", features = ["serde"] }
-env_logger = "0.11"
 hex = "0.4"
 r2d2 = "0.8"
 redis = { version = "0.24", features = ["r2d2", "async-std"] }
@@ -21,3 +20,4 @@ serde = { version = "1.0", features = ["derive"] }
 serde_json = { version = "1.0", features = ["std"] }
 sha1 = "0.10"
 tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter", "std", "json", "fmt"] }

src/main.rs

@@ -4,10 +4,10 @@ use actix_web::{error, web, App, Error, HttpResponse, HttpServer};
 use anyhow::Context;
 use cache::{memory_backend, CacheBackendFactory};
 use clap::Parser;
-use env_logger::Env;
 use reqwest::Url;
 use serde::Serialize;
 use serde_json::{json, Value};
+use tracing_subscriber::EnvFilter;
 
 use crate::args::Args;
 use crate::cache::redis_backend::RedisBackendFactory;
@@ -296,10 +296,20 @@ fn extract_single_request_info(
 
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
-    env_logger::init_from_env(Env::default().default_filter_or("info"));
-
     let args = Args::parse();
 
+    // Initialize tracing
+    if std::env::var("RUST_LOG_FORMAT") == Ok("json".to_string()) {
+        tracing_subscriber::fmt()
+            .with_env_filter(EnvFilter::from_default_env())
+            .json()
+            .init();
+    } else {
+        tracing_subscriber::fmt()
+            .with_env_filter(EnvFilter::from_default_env())
+            .init();
+    }
+
     let mut app_state = AppState {
         chains: Default::default(),
         http_client: reqwest::Client::new(),