Implement Commanding (#6)

Reviewed-on: #6
Co-authored-by: Sergey Savelyev <sergeysav.nn@gmail.com>
Co-committed-by: Sergey Savelyev <sergeysav.nn@gmail.com>

server/src/command/error.rs

@@ -0,0 +1,42 @@
+use crate::core::TelemetryDataType;
+use actix_web::http::StatusCode;
+use actix_web::ResponseError;
+use thiserror::Error;
+
+#[derive(Error, Debug)]
+pub enum Error {
+    #[error("Command Not Found {0}")]
+    CommandNotFound(String),
+    #[error("Incorrect Number of Parameters Specified. {expected} expected. {actual} found.")]
+    IncorrectParameterCount { expected: usize, actual: usize },
+    #[error("Missing Parameter {0}.")]
+    MisingParameter(String),
+    #[error("Incorrect Parameter Type for {name}. {expected_type:?} expected.")]
+    WrongParameterType {
+        name: String,
+        expected_type: TelemetryDataType,
+    },
+    #[error("No Command Receiver")]
+    NoCommandReceiver,
+    #[error("Failed to Send")]
+    FailedToSend,
+    #[error("Failed to Receive Command Response")]
+    FailedToReceiveResponse,
+    #[error("Command Failure: {0}")]
+    CommandFailure(String),
+}
+
+impl ResponseError for Error {
+    fn status_code(&self) -> StatusCode {
+        match *self {
+            Error::CommandNotFound(_) => StatusCode::NOT_FOUND,
+            Error::IncorrectParameterCount { .. } => StatusCode::BAD_REQUEST,
+            Error::MisingParameter(_) => StatusCode::BAD_REQUEST,
+            Error::WrongParameterType { .. } => StatusCode::BAD_REQUEST,
+            Error::NoCommandReceiver => StatusCode::SERVICE_UNAVAILABLE,
+            Error::FailedToSend => StatusCode::INTERNAL_SERVER_ERROR,
+            Error::FailedToReceiveResponse => StatusCode::INTERNAL_SERVER_ERROR,
+            Error::CommandFailure(_) => StatusCode::BAD_REQUEST,
+        }
+    }
+}