feat(settings): log path to field where config deserialization failed (#78)

Co-authored-by: Arun Raj M <jarnura47@gmail.com>

Cargo.lock

@@ -2650,6 +2650,7 @@ dependencies = [
  "router_env",
  "serde",
  "serde_json",
+ "serde_path_to_error",
  "serde_qs",
  "serde_urlencoded",
  "sha2",
@@ -2894,6 +2895,15 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "serde_path_to_error"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "184c643044780f7ceb59104cef98a5a6f12cb2288a7bc701ab93a362b49fd47d"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "serde_qs"
 version = "0.10.1"

crates/router/Cargo.toml

@@ -53,6 +53,7 @@ reqwest = { version = "0.11.12", features = ["json"] }
 ring = "0.16.20"
 serde = { version = "1.0.145", features = ["derive"] }
 serde_json = "1.0.85"
+serde_path_to_error = "0.1.8"
 serde_qs = { version = "0.10.1", optional = true }
 serde_urlencoded = "0.7.1"
 sha2 = "0.10.5"

crates/router/src/configs/settings.rs

@@ -165,10 +165,10 @@ impl Settings {
             )
             .build()?;
 
-        config.try_deserialize().map_err(|e| {
-            logger::error!("Unable to source config file");
-            eprintln!("Unable to source config file");
-            BachError::from(e)
+        serde_path_to_error::deserialize(config).map_err(|error| {
+            logger::error!(%error, "Unable to deserialize application configuration");
+            eprintln!("Unable to deserialize application configuration: {error}");
+            BachError::from(error.into_inner())
         })
     }
 }

crates/router/src/core/errors.rs

@@ -119,7 +119,7 @@ pub enum BachError {
     #[error("{{ error_description: Error while parsing, error_message: {0} }}")]
     EParsingError(error_stack::Report<ParsingError>),
 
-    #[error("Environment configuration error: {0}")]
+    #[error("Application configuration error: {0}")]
     ConfigurationError(ConfigError),
 
     #[error("{{ error_description: Database operation failed, error_message: {0} }}")]