uses a proc-macro to automate command definitions

api-core/src/command.rs

@@ -0,0 +1,47 @@
+use crate::data_type::DataType;
+use crate::data_value::DataValue;
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use std::collections::HashMap;
+use thiserror::Error;
+
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct CommandParameterDefinition {
+    pub name: String,
+    pub data_type: DataType,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct CommandDefinition {
+    pub name: String,
+    pub parameters: Vec<CommandParameterDefinition>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct CommandHeader {
+    pub timestamp: DateTime<Utc>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Command {
+    #[serde(flatten)]
+    pub header: CommandHeader,
+    pub parameters: HashMap<String, DataValue>,
+}
+
+#[derive(Debug, Error)]
+pub enum IntoCommandDefinitionError {
+    #[error("Parameter Missing: {0}")]
+    ParameterMissing(String),
+    #[error("Mismatched Type for {parameter}. {expected:?} expected")]
+    MismatchedType {
+        parameter: String,
+        expected: DataType,
+    },
+}
+
+pub trait IntoCommandDefinition: Sized {
+    fn create(name: String) -> CommandDefinition;
+
+    fn parse(command: Command) -> Result<Self, IntoCommandDefinitionError>;
+}