From 0d2611a08449c8596faccf5f8e385980f571bf2d Mon Sep 17 00:00:00 2001
From: necrashter
Date: Sat, 23 Apr 2022 13:55:48 +0300
Subject: Implement the ability to read config from yaml

---
 Cargo.lock    |  1 +
 Cargo.toml    |  1 +
 src/config.rs | 25 +++++++++++++++++++++++++
 3 files changed, 27 insertions(+)

diff --git a/Cargo.lock b/Cargo.lock
index 5a8a201..c77debd 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -524,6 +524,7 @@ dependencies = [
  "serde",
  "serde_json",
  "serde_test",
+ "serde_yaml",
  "sha2",
  "tokio",
  "warp",
diff --git a/Cargo.toml b/Cargo.toml
index 065cd84..45703ff 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,6 +16,7 @@ log = "0.4.8"
 log4rs = "1.0.0"
 parking_lot = "0.10.0"
 serde_json = "1.0.59"
+serde_yaml = "0.8"
 lazy_static = "1.4.0"
 blake2 = "0.9.1"
 hex-literal = "0.3.1"
diff --git a/src/config.rs b/src/config.rs
index 80d2def..10c054c 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -2,6 +2,7 @@
 //!
 //! This module holds the data structures for network configuration.
 use serde::{Deserialize, Serialize};
+use log::{error, info};
 
 /// Configuration for a single network
 #[derive(Debug, Serialize, Deserialize, Clone, Default)]
@@ -18,3 +19,27 @@ pub struct Config {
     // Transaction traffic reward
     pub tx_traffic_reward: u16,
 }
+
+impl Config {
+    pub fn read(filename: &str) -> Option<Self> {
+        let file = match std::fs::File::open(filename) {
+            Ok(f) => f,
+            Err(e) => {
+                error!("Cannot read config file: {}", filename);
+                error!("Error: {:?}", e);
+                return None;
+            },
+        };
+        let config : Config = match serde_yaml::from_reader(file) {
+            Ok(c) => c,
+            Err(e) => {
+                error!("Cannot parse config file: {}", filename);
+                error!("Error: {:?}", e);
+                return None;
+            },
+        };
+        // File closes automatically when it goes out of scope.
+        info!("Config file read successfully: {}", filename);
+        Some(config)
+    }
+}
-- 
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