commit 857f21b319ec565570b47d07537d43d64d8918b9
Author: Kalzu Rekku <kalzu@laiska.net>
Date:   Sun Oct 25 10:56:50 2026 +0200

    state before logs!

diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..a247ea2
--- /dev/null
+++ b/Cargo.lock
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+ "rustversion",
+ "wasm-bindgen-macro",
+ "wasm-bindgen-shared",
+]
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+ "wasm-bindgen-shared",
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+ "windows-link",
+ "windows-result",
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+]
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+ "windows-link",
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..a2250eb
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "rust_test"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+axum = { version = "0.8.9", features = ["json"] }
+chrono = { version = "0.4.45", features = ["serde"] }
+rusqlite = { version = "0.41.0", features = ["bundled"] }
+serde = { version = "1.0.229", features = ["derive"] }
+serde_json = "1.0.154"
+tokio = { version = "1.54.1", features = ["macros", "rt-multi-thread"] }
+tracing = "0.1.44"
+tracing-subscriber = "0.3.23"
+uuid = { version = "1.29.0", features = ["v4", "serde"] }
diff --git a/config.json b/config.json
new file mode 100644
index 0000000..1c95805
--- /dev/null
+++ b/config.json
@@ -0,0 +1,14 @@
+{
+  "mode": "strict",
+  "fields": {
+    "version": {
+      "type": "integer"
+    },
+    "message": {
+      "type": "string"
+    },
+    "name": {
+      "type": "string"
+    }
+  }
+}
diff --git a/messages.db b/messages.db
new file mode 100644
index 0000000..589f3af
Binary files /dev/null and b/messages.db differ
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..991945d
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,255 @@
+
+use axum::{
+    extract::{rejection::JsonRejection, State},
+    http::StatusCode,
+    routing::get,
+    Json, Router,
+};
+use chrono::Utc;
+use rusqlite::{params, Connection};
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+use std::{
+    collections::HashMap,
+    fs,
+    sync::{Arc, Mutex},
+};
+use uuid::Uuid;
+
+#[derive(Clone)]
+struct AppState {
+    db: Arc<Mutex<Connection>>,
+    schema: Arc<SchemaConfig>,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "lowercase")]
+enum ValidationMode {
+    Strict,
+    Loose,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "lowercase")]
+enum DataType {
+    String,
+    Integer,
+    Number,
+    Boolean,
+    Object,
+    Array,
+    Null,
+}
+
+#[derive(Debug, Deserialize)]
+struct FieldSpec {
+    #[serde(rename = "type")]
+    data_type: DataType,
+}
+
+#[derive(Debug, Deserialize)]
+struct SchemaConfig {
+    mode: ValidationMode,
+    fields: HashMap<String, FieldSpec>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+struct ApiResponse {
+    uuid: Uuid,
+    date: String,
+    data: Value,
+}
+
+#[derive(Debug, Deserialize)]
+struct CreateRequest {
+    data: Value,
+}
+
+type ApiError = (StatusCode, String);
+
+fn bad_request(message: impl Into<String>) -> ApiError {
+    (StatusCode::BAD_REQUEST, message.into())
+}
+
+fn internal_error() -> ApiError {
+    (
+        StatusCode::INTERNAL_SERVER_ERROR,
+        "Internal server error".to_string(),
+    )
+}
+
+fn matches_type(value: &Value, expected: &DataType) -> bool {
+    match expected {
+        DataType::String => value.is_string(),
+        DataType::Integer => {
+            value.as_i64().is_some() || value.as_u64().is_some()
+        }
+        DataType::Number => value.is_number(),
+        DataType::Boolean => value.is_boolean(),
+        DataType::Object => value.is_object(),
+        DataType::Array => value.is_array(),
+        DataType::Null => value.is_null(),
+    }
+}
+
+fn validate_data(
+    data: &Value,
+    schema: &SchemaConfig,
+) -> Result<(), String> {
+    let object = data
+        .as_object()
+        .ok_or("data must be a JSON object")?;
+
+    // Every configured field must exist and have the correct type.
+    for (key, spec) in &schema.fields {
+        let value = object
+            .get(key)
+            .ok_or_else(|| format!("Missing required field: {key}"))?;
+
+        if !matches_type(value, &spec.data_type) {
+            return Err(format!(
+                "Field '{key}' has the wrong type; expected {}",
+                match spec.data_type {
+                    DataType::String => "string",
+                    DataType::Integer => "integer",
+                    DataType::Number => "number",
+                    DataType::Boolean => "boolean",
+                    DataType::Object => "object",
+                    DataType::Array => "array",
+                    DataType::Null => "null",
+                }
+            ));
+        }
+    }
+
+    // Strict mode rejects any fields not defined in the config.
+    if let ValidationMode::Strict = schema.mode {
+        for key in object.keys() {
+            if !schema.fields.contains_key(key) {
+                return Err(format!("Unknown field: {key}"));
+            }
+        }
+    }
+
+    Ok(())
+}
+
+async fn create_record(
+    State(state): State<AppState>,
+    payload: Result<Json<CreateRequest>, JsonRejection>,
+) -> Result<(StatusCode, Json<ApiResponse>), ApiError> {
+    let Json(request) =
+        payload.map_err(|_| bad_request("Invalid JSON request body"))?;
+
+    validate_data(&request.data, &state.schema)
+        .map_err(bad_request)?;
+
+    let record = ApiResponse {
+        uuid: Uuid::new_v4(),
+        date: Utc::now().to_rfc3339(),
+        data: request.data,
+    };
+
+    let data_json =
+        serde_json::to_string(&record.data).map_err(|_| internal_error())?;
+
+    let db = state.db.lock().map_err(|_| internal_error())?;
+
+    db.execute(
+        "INSERT INTO records (uuid, date, data)
+         VALUES (?1, ?2, ?3)",
+        params![
+            record.uuid.to_string(),
+            record.date,
+            data_json,
+        ],
+    )
+    .map_err(|_| internal_error())?;
+
+    Ok((StatusCode::CREATED, Json(record)))
+}
+
+async fn list_records(
+    State(state): State<AppState>,
+) -> Result<Json<Vec<ApiResponse>>, ApiError> {
+    let db = state.db.lock().map_err(|_| internal_error())?;
+
+    let mut statement = db
+        .prepare(
+            "SELECT uuid, date, data
+             FROM records
+             ORDER BY date DESC
+             LIMIT 100",
+        )
+        .map_err(|_| internal_error())?;
+
+    let rows = statement
+        .query_map([], |row| {
+            Ok((
+                row.get::<_, String>(0)?,
+                row.get::<_, String>(1)?,
+                row.get::<_, String>(2)?,
+            ))
+        })
+        .map_err(|_| internal_error())?;
+
+    let mut records = Vec::new();
+
+    for row in rows {
+        let (uuid, date, data_json) =
+            row.map_err(|_| internal_error())?;
+
+        let uuid =
+            Uuid::parse_str(&uuid).map_err(|_| internal_error())?;
+
+        let data: Value =
+            serde_json::from_str(&data_json)
+                .map_err(|_| internal_error())?;
+
+        records.push(ApiResponse { uuid, date, data });
+    }
+
+    Ok(Json(records))
+}
+
+#[tokio::main]
+async fn main() {
+    let config_text = fs::read_to_string("config.json")
+        .expect("Failed to read config.json");
+
+    let schema: SchemaConfig =
+        serde_json::from_str(&config_text)
+            .expect("Invalid config.json");
+
+    let db = Connection::open("messages.db")
+        .expect("Failed to open SQLite database");
+
+    db.execute_batch(
+        "CREATE TABLE IF NOT EXISTS records (
+            uuid TEXT PRIMARY KEY,
+            date TEXT NOT NULL,
+            data TEXT NOT NULL
+        );",
+    )
+    .expect("Failed to initialize database");
+
+    let state = AppState {
+        db: Arc::new(Mutex::new(db)),
+        schema: Arc::new(schema),
+    };
+
+    let app = Router::new()
+        .route("/api/records", get(list_records).post(create_record))
+        .with_state(state);
+
+    let addr = "127.0.0.1:3000";
+    let listener = tokio::net::TcpListener::bind(addr)
+        .await
+        .expect("Failed to bind address");
+
+    println!("Listening on http://{addr}");
+
+    axum::serve(listener, app)
+        .await
+        .expect("HTTP server failed");
+}