obtain log level from env, use trace as a default (#34)

stepper/src/fce.rs

@@ -26,23 +26,14 @@
     unreachable_patterns
 )]
 
+mod logger;
+
 use fluence::fce;
 use stepper_lib::execute_aqua;
-use stepper_lib::log_targets::TARGET_MAP;
 use stepper_lib::StepperOutcome;
 
-use std::collections::HashMap;
-
 pub fn main() {
-    use std::iter::FromIterator;
-
-    let target_map = HashMap::from_iter(TARGET_MAP.iter().cloned());
-
-    fluence::WasmLogger::new()
-        .with_log_level(log::Level::Info)
-        .with_target_map(target_map)
-        .build()
-        .unwrap();
+    logger::init_logger();
 }
 
 #[fce]

stepper/src/logger.rs

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2020 Fluence Labs Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+use log::Level as LogLevel;
+use stepper_lib::log_targets::TARGET_MAP;
+
+use std::collections::HashMap;
+
+const RUST_LOG_ENV_NAME: &str = "RUST_LOG";
+const DEFAULT_LOG_LEVEL: &str = "trace";
+
+pub fn init_logger() {
+    use std::iter::FromIterator;
+
+    let target_map = HashMap::from_iter(TARGET_MAP.iter().cloned());
+    let log_level_str = std::env::var(RUST_LOG_ENV_NAME).unwrap_or(String::from(DEFAULT_LOG_LEVEL));
+    let log_level = to_log_level(&log_level_str);
+
+    fluence::WasmLogger::new()
+        .with_log_level(log_level)
+        .with_target_map(target_map)
+        .build()
+        .unwrap();
+}
+
+fn to_log_level(raw_log_level: &String) -> LogLevel {
+    use LogLevel::*;
+
+    match raw_log_level.to_ascii_lowercase().as_str() {
+        "error" => Error,
+        "warn" => Warn,
+        "info" => Info,
+        "debug" => Debug,
+        "trace" => Trace,
+        _ => Trace,
+    }
+}

stepper/src/wasm_bindgen.rs

@@ -26,23 +26,14 @@
     unreachable_patterns
 )]
 
-use stepper_lib::execute_aqua;
-use stepper_lib::log_targets::TARGET_MAP;
-use wasm_bindgen::prelude::*;
+mod logger;
 
-use std::collections::HashMap;
+use stepper_lib::execute_aqua;
+use wasm_bindgen::prelude::*;
 
 #[wasm_bindgen(start)]
 pub fn main() {
-    use std::iter::FromIterator;
-
-    let target_map = HashMap::from_iter(TARGET_MAP.iter().cloned());
-
-    fluence::WasmLogger::new()
-        .with_log_level(log::Level::Info)
-        .with_target_map(target_map)
-        .build()
-        .unwrap();
+    logger::init_logger();
 }
 
 #[wasm_bindgen]