From 5da65fb6031013f4e84b284f9003afb39139240e Mon Sep 17 00:00:00 2001
From: JMARyA <jmarya@hydrar.de>
Date: Wed, 17 Jul 2024 09:40:59 +0200
Subject: [PATCH] init

---
 .gitignore             |    1 +
 Cargo.lock             | 1799 ++++++++++++++++++++++++++++++++++++++++
 Cargo.toml             |   14 +
 README.md              |    2 +
 src/lib.rs             |   43 +
 src/model/historic.rs  |   44 +
 src/model/mod.rs       |   85 ++
 src/model/reference.rs |   62 ++
 src/model/update.rs    |  142 ++++
 src/model/valid.rs     |   40 +
 10 files changed, 2232 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 README.md
 create mode 100644 src/lib.rs
 create mode 100644 src/model/historic.rs
 create mode 100644 src/model/mod.rs
 create mode 100644 src/model/reference.rs
 create mode 100644 src/model/update.rs
 create mode 100644 src/model/valid.rs

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ea8c4bf
--- /dev/null
+++ b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..8b13cd6
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+++ b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..ccc5148
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,14 @@
+[package]
+name = "mongod"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+chrono = "0.4.38"
+futures = "0.3.30"
+mongodb = "2.8.0"
+regex = "1.10.5"
+serde = { version = "1.0.195", features = ["derive"] }
+serde_json = "1.0.111"
+tokio = { version = "1.35.1", features = ["full"] }
+uuid = { version = "1.8.0", features = ["v4"] }
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..d23a436
--- /dev/null
+++ b/README.md
@@ -0,0 +1,2 @@
+# mongod
+mongod is a rust crate for a model based database on top of MongoDB.
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..8805cbf
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,43 @@
+pub mod model;
+
+/// Get a `MongoDB` Client from the environment
+#[macro_export]
+macro_rules! get_mongo {
+    () => {
+        mongodb::Client::with_uri_str(std::env::var("DB_URI").unwrap())
+            .await
+            .unwrap()
+    };
+}
+
+/// Get a database collection
+#[macro_export]
+macro_rules! col {
+    ($db:expr, $col:expr) => {
+        $db.database("owl")
+            .collection::<mongodb::bson::Document>($col)
+    };
+}
+
+/// Collect database results into a `Vec<_>`
+#[macro_export]
+macro_rules! collect_results {
+    ($res:expr) => {{
+        use futures::stream::TryStreamExt;
+        let mut ret = vec![];
+
+        while let Some(doc) = $res.try_next().await.unwrap() {
+            ret.push(doc);
+        }
+
+        ret
+    }};
+}
+
+/// `MongoDB` filter for the `_id` field.
+#[macro_export]
+macro_rules! id_of {
+    ($id:expr) => {
+        mongodb::bson::doc! { "_id": $id}
+    };
+}
diff --git a/src/model/historic.rs b/src/model/historic.rs
new file mode 100644
index 0000000..9b8c2bf
--- /dev/null
+++ b/src/model/historic.rs
@@ -0,0 +1,44 @@
+use serde::{Deserialize, Serialize};
+use std::{collections::HashMap, ops::Deref};
+
+/// A struct to keep track of historical changes to a value.
+/// This struct represents a value that has a current state and a history of previous states.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Historic<T> {
+    /// The current value
+    pub current: T,
+    /// A map of timestamps (RFC 3339) to historical values.
+    pub changes: HashMap<String, T>,
+}
+
+impl<T: Clone + std::cmp::PartialEq> Historic<T> {
+    /// Create a new value with tracked history
+    pub fn new(value: T) -> Historic<T> {
+        let mut changes = HashMap::new();
+        changes.insert(chrono::Utc::now().to_rfc3339(), value.clone());
+
+        Self {
+            current: value,
+            changes,
+        }
+    }
+
+    /// Update the value. The change will be recorded.
+    pub fn update(&mut self, value: T) {
+        if self.current == value {
+            return;
+        }
+
+        self.changes
+            .insert(chrono::Utc::now().to_rfc3339(), value.clone());
+        self.current = value;
+    }
+}
+
+impl<T> Deref for Historic<T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        &self.current
+    }
+}
diff --git a/src/model/mod.rs b/src/model/mod.rs
new file mode 100644
index 0000000..3c26185
--- /dev/null
+++ b/src/model/mod.rs
@@ -0,0 +1,85 @@
+use reference::Referencable;
+use serde_json::{Map, Value};
+use valid::Validate;
+
+use crate::{col, get_mongo, id_of};
+
+pub mod historic;
+pub mod reference;
+pub mod update;
+pub mod valid;
+
+/// Error type when updating a model
+#[derive(Debug)]
+pub enum UpdateError {
+    /// Provided data was no object
+    NoObject,
+    /// Database related error
+    Database,
+    /// Validation failed
+    Validation,
+}
+
+pub trait Model:
+    Sized + Referencable + Validate + serde::Serialize + for<'a> serde::Deserialize<'a>
+{
+    /// Insert the model into the database
+    async fn insert(&self) {
+        let db = get_mongo!();
+        let collection = col!(db, Self::collection_name());
+        collection
+            .insert_one(mongodb::bson::to_document(self).unwrap(), None)
+            .await
+            .unwrap();
+    }
+
+    /// Get a model by id from the database
+    async fn get(id: &str) -> Option<Self> {
+        let db = get_mongo!();
+        let collection = col!(db, Self::collection_name());
+        let doc = collection.find_one(id_of!(id), None).await.ok()??;
+        mongodb::bson::from_document(doc).ok()
+    }
+
+    /// Update values of model into database
+    async fn update(&mut self, data: &serde_json::Value) -> Result<(), UpdateError> {
+        // get db collection
+        let db = get_mongo!();
+        let collection = col!(db, Self::collection_name());
+        let mut update = mongodb::bson::Document::new();
+
+        if let Some(obj) = data.as_object() {
+            // run model specific update
+            self.update_values(obj, &mut update).await;
+
+            // validate and update
+            if self.validate().await {
+                collection
+                    .update_one(
+                        id_of!(self.id()),
+                        mongodb::bson::doc! {"$set": update },
+                        None,
+                    )
+                    .await
+                    .map_err(|_| UpdateError::Database)?;
+                return Ok(());
+            } else {
+                return Err(UpdateError::Validation);
+            }
+        }
+
+        Err(UpdateError::NoObject)
+    }
+
+    /// Update the `Model` based on the provided JSON Object.
+    ///
+    /// This function should be implemented for a `Model`. It should update all keys from the JSON Object.
+    /// For every updated value in the JSON Object the `Model`s fields should be updated and the value should be put in the `update` `Document`
+    ///
+    /// To avoid making mistakes in the Update logic use the macros from `update.rs`
+    async fn update_values(
+        &mut self,
+        obj: &Map<String, Value>,
+        update: &mut mongodb::bson::Document,
+    );
+}
diff --git a/src/model/reference.rs b/src/model/reference.rs
new file mode 100644
index 0000000..25bc8f7
--- /dev/null
+++ b/src/model/reference.rs
@@ -0,0 +1,62 @@
+use serde::{de::DeserializeOwned, Deserialize, Serialize};
+
+use crate::{col, get_mongo, id_of};
+
+use super::valid::Validate;
+
+/// A `Reference` to a `Model`
+#[derive(Debug, Clone, Default, Serialize, Deserialize, PartialEq, Eq)]
+pub struct Reference(String);
+
+impl Reference {
+    /// Create a new reference
+    pub async fn new(reference: &str) -> Option<Self> {
+        let r = Self(reference.to_string());
+        if r.validate().await {
+            Some(r)
+        } else {
+            None
+        }
+    }
+
+    /// Checks if a reference is part of a model collection.
+    pub fn is_of_collection(&self, col: &str) -> bool {
+        self.0.starts_with(col)
+    }
+
+    /// Get the raw `Document` behind the `Reference` from the database.
+    pub async fn get_document(&self) -> Option<mongodb::bson::Document> {
+        let (col, id) = self.0.split_once("::")?;
+        let db = get_mongo!();
+        let col = col!(db, col);
+        col.find_one(id_of!(id), None).await.ok()?
+    }
+
+    /// Get the `Model` behind the `Reference` from the database.
+    pub async fn get<T: DeserializeOwned>(&self) -> T {
+        mongodb::bson::from_document(self.get_document().await.unwrap()).unwrap()
+    }
+}
+
+impl Validate for Reference {
+    async fn validate(&self) -> bool {
+        // cheap
+        //self.0.split_once("::").is_some()
+
+        // right
+        self.get_document().await.is_some()
+    }
+}
+
+/// A trait that allows you to get a reference to a `Model`
+pub trait Referencable {
+    /// The name of this model's collection
+    fn collection_name() -> &'static str;
+    /// The id of this model
+    fn id(&self) -> &str;
+
+    /// Get a reference to the object
+    fn reference(&self) -> Reference {
+        Reference(format!("{}::{}", Self::collection_name(), self.id()))
+    }
+}
diff --git a/src/model/update.rs b/src/model/update.rs
new file mode 100644
index 0000000..15f55ca
--- /dev/null
+++ b/src/model/update.rs
@@ -0,0 +1,142 @@
+/// Updates the value of an entity off JSON data.
+///
+/// This macro updates the given field of the entity with the parsed value from the JSON object.
+/// If the key is present in the JSON, it will be updated. Otherwise, it will not be updated.
+///
+/// # Parameters
+///
+/// * `$entity`: The entity that contains the field to be updated.
+/// * `$json`: The JSON object containing the update values to be parsed.
+/// * `$key`: The literal key to search for in the JSON object.
+/// * `$field`: The field name of the entity that should be updated.
+/// * `$update`: A BSON Document for updating the database
+#[macro_export]
+macro_rules! update_historic_str {
+    ($entity:ident, $json:ident, $key:literal, $field:ident, $update:ident) => {
+        if let Some(val) = $json.get($key) {
+            if let Some(val_str) = val.as_str() {
+                let mut field = $entity.$field.clone();
+                if !(&field.current == val_str) {
+                    field.update(val_str.to_owned());
+                    $entity.$field = field;
+                    $update.insert($key, mongodb::bson::to_bson(&$entity.$field).unwrap());
+                }
+            }
+        }
+    };
+}
+
+/// Updates the value of an entity off JSON data.
+///
+/// This macro updates the given field of the entity with the parsed value from the JSON object.
+/// If the key is present in the JSON, it will be updated. Otherwise, it will not be updated.
+///
+/// # Parameters
+///
+/// * `$entity`: The entity that contains the field to be updated.
+/// * `$json`: The JSON object containing the update values to be parsed.
+/// * `$key`: The literal key to search for in the JSON object.
+/// * `$field`: The field name of the entity that should be updated.
+/// * `$update`: A BSON Document for updating the database
+#[macro_export]
+macro_rules! update_historic_ref_option {
+    ($entity:ident, $json:ident, $key:literal, $field:ident, $update:ident) => {
+        if let Some(val) = $json.get($key) {
+            if let Some(val_str) = val.as_str() {
+                let value = Historic::new(Reference::new(val_str).await.unwrap());
+                let field = $entity.$field.clone().unwrap_or_else(|| value);
+                $entity.$field = Some(field);
+                $update.insert($key, mongodb::bson::to_bson(&$entity.$field).unwrap());
+            }
+        }
+    };
+}
+
+/// Updates the value of an entity off JSON data.
+///
+/// This macro updates the given field of the entity with the parsed value from the JSON object.
+/// If the key is present in the JSON, it will be updated. Otherwise, it will not be updated.
+///
+/// # Parameters
+///
+/// * `$entity`: The entity that contains the field to be updated.
+/// * `$json`: The JSON object containing the update values to be parsed.
+/// * `$key`: The literal key to search for in the JSON object.
+/// * `$field`: The field name of the entity that should be updated.
+/// * `$update`: A BSON Document for updating the database
+#[macro_export]
+macro_rules! update_historic_vec {
+    ($entity:ident, $json:ident, $key:literal, $field:ident, $update:ident) => {
+        if let Some(val) = $json.get($key) {
+            if let Some(val) = val.as_array() {
+                let mut field = $entity.$field.clone();
+                field.update(
+                    val.into_iter()
+                        .map(|x| serde_json::from_value(x.clone()).unwrap())
+                        .collect(),
+                );
+                $entity.$field = field;
+                $update.insert($key, mongodb::bson::to_bson(&$entity.$field).unwrap());
+            }
+        }
+    };
+}
+
+/// Updates the value of an entity off JSON data.
+///
+/// This macro updates the given field of the entity with the parsed value from the JSON object.
+/// If the key is present in the JSON, it will be updated. Otherwise, it will not be updated.
+///
+/// # Parameters
+///
+/// * `$entity`: The entity that contains the field to be updated.
+/// * `$json`: The JSON object containing the update values to be parsed.
+/// * `$key`: The literal key to search for in the JSON object.
+/// * `$field`: The field name of the entity that should be updated.
+/// * `$update`: A BSON Document for updating the database
+/// * `$t`: The type of the value
+#[macro_export]
+macro_rules! update_value {
+    ($entity:ident, $json:ident, $key:literal, $field:ident, $update:ident, $t:ty) => {
+        if let Some(val) = $json.get($key) {
+            if let Ok(val) = serde_json::from_value::<$t>(val.clone()) {
+                if val != $entity.$field {
+                    $entity.$field = val;
+                    $update.insert($key, mongodb::bson::to_bson(&$entity.$field).unwrap());
+                }
+            }
+        }
+    };
+}
+
+/// Updates the value of an entity off JSON data.
+///
+/// This macro updates the given field of the entity with the parsed value from the JSON object.
+/// If the key is present in the JSON, it will be updated. Otherwise, it will not be updated.
+///
+/// # Parameters
+///
+/// * `$entity`: The entity that contains the field to be updated.
+/// * `$json`: The JSON object containing the update values to be parsed.
+/// * `$key`: The literal key to search for in the JSON object.
+/// * `$field`: The field name of the entity that should be updated.
+/// * `$update`: A BSON Document for updating the database
+/// * `$t`: The type of the value
+#[macro_export]
+macro_rules! update_value_option {
+    ($entity:ident, $json:ident, $key:literal, $field:ident, $update:ident, $t:ty) => {
+        if let Some(val) = $json.get($key) {
+            if let Ok(val) = serde_json::from_value::<$t>(val.clone()) {
+                if let Some(v) = &$entity.$field {
+                    if val != *v {
+                        $entity.$field = Some(val);
+                        $update.insert($key, mongodb::bson::to_bson(&$entity.$field).unwrap());
+                    }
+                } else {
+                    $entity.$field = Some(val);
+                    $update.insert($key, mongodb::bson::to_bson(&$entity.$field).unwrap());
+                }
+            }
+        }
+    };
+}
diff --git a/src/model/valid.rs b/src/model/valid.rs
new file mode 100644
index 0000000..a22c024
--- /dev/null
+++ b/src/model/valid.rs
@@ -0,0 +1,40 @@
+/// This trait allows a `Model` to be validated.
+pub trait Validate {
+    /// Validate the `Model`
+    async fn validate(&self) -> bool;
+}
+
+/// Validate a value and return `false` if validation fails.
+#[macro_export]
+macro_rules! validate {
+    ($val:expr) => {
+        if !$val.validate().await {
+            return false;
+        }
+    };
+}
+
+/// This macro checks for the type of a reference and is useful for validation.
+/// It will check all supplied types and return `false` if none are matching.
+///
+/// # Example
+/// ```
+/// fn validate(&self) -> bool {
+///     assert_reference_of!(self.owner, Person);
+///     true
+/// }
+/// ```
+#[macro_export]
+macro_rules! assert_reference_of {
+    ($var:expr, $($struct_name:ident),+) => {
+        let mut match_found = false;
+        $(
+            if $var.is_of_collection($struct_name::collection_name()) {
+                match_found = true;
+            }
+        )*
+        if !match_found {
+            return false;
+        }
+    };
+}