commit 6cf9e62f00f493a653c151adab0e1acd201cd916
Author: Paul Z <info@pfz4.de>
Date:   Fri Apr 28 18:55:41 2023 +0200

    init

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f82c255
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..b09e3ce
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "permission"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+serde = { version="1.0", features=["derive"] }
+tokio = { version = "1.27.0", features = ["full"] }
+log = "0.4.17"
+pretty_env_logger = "0.4.0"
+dotenvy = "0.15.7"
+tonic = { version="0.9.2", features=["tls"] }
+prost = "0.11.9"
+
+[build-dependencies]
+tonic-build = "0.9.2"
diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..6672921
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,6 @@
+fn main() {
+    tonic_build::configure()
+        .build_server(true)
+        .compile(&["proto/graph.proto"], &["proto"])
+        .unwrap();
+}
diff --git a/graph.dat b/graph.dat
new file mode 100644
index 0000000..c4f5c07
--- /dev/null
+++ b/graph.dat
@@ -0,0 +1,10 @@
+[user:bob]
+
+[doc:foo]
+read = [doc:foo#owner, user:bob]
+owner = [user:alice]
+
+[user:oscar]
+
+[user:alice]
+
diff --git a/graph.dat.bak b/graph.dat.bak
new file mode 100644
index 0000000..9dc7a90
--- /dev/null
+++ b/graph.dat.bak
@@ -0,0 +1,10 @@
+[user:bob]
+
+[doc:foo]
+read = [user:bob, doc:foo#owner]
+owner = [user:alice]
+
+[user:oscar]
+
+[user:alice]
+
diff --git a/proto/graph.proto b/proto/graph.proto
new file mode 100644
index 0000000..4981f83
--- /dev/null
+++ b/proto/graph.proto
@@ -0,0 +1,73 @@
+syntax = "proto3";
+package eu.zettoit.graph;
+
+service ObjectService{
+  rpc Create(Object) returns (Empty);
+  rpc Delete(Object) returns (Empty);
+  rpc Exists(Object) returns (ExistsResponse);
+}
+
+service RelationService {
+  rpc Create(Relation) returns (Empty);
+  rpc Delete(Relation) returns (Empty);
+  rpc Exists(Relation) returns (ExistsResponse);
+}
+
+service QueryService {
+  // check if one object or objectset is related to another by a relation
+  rpc IsRelatedTo(Relation) returns (IsRelatedToResponse);
+
+  // get all objects that are related to one object by a relation
+  rpc GetRelatedTo(Set) returns (GetRelatedToResponse);
+
+  // get all objects that the given object has a relation with
+  rpc GetRelations(GetRelationsRequest) returns (GetRelationsResponse);
+}
+
+message ExistsResponse {
+  bool exists = 1;
+}
+
+message IsRelatedToResponse{
+  bool related = 1;
+}
+
+message GetRelatedToResponse{
+  repeated Object objects = 1;
+}
+
+message GetRelationsRequest{
+  Object object = 1;
+  string relation = 2;
+}
+message GetRelationsResponse{
+  repeated Object objects = 1;
+}
+
+message Object{
+  string namespace = 1;
+  string id = 2;
+}
+message Set{
+  string namespace = 1;
+  string id = 2;
+  string relation = 3;
+}
+
+message ObjectOrSet {
+  oneof object_or_set{
+    Object object = 1;
+    Set set = 2;
+  };
+}
+
+message Relation{
+  oneof src{
+    Object src_obj = 1;
+    Set src_set = 2;
+  };
+  Object dst = 3;
+  string relation = 4;
+}
+
+message Empty{}
diff --git a/proto/graph_permissions.proto b/proto/graph_permissions.proto
new file mode 100644
index 0000000..652bcb4
--- /dev/null
+++ b/proto/graph_permissions.proto
@@ -0,0 +1,20 @@
+syntax = "proto3";
+package eu.zettoit.graph;
+
+message Object{
+  string namespace = 1;
+  string id = 2;
+}
+message ObjectSet{
+  Object object = 1;
+  string relation = 2;
+}
+
+
+message Relation{
+  oneof src{
+    Object object = 1;
+    ObjectSet object_set = 2;
+  }
+  ObjectSet dst = 3;
+}
diff --git a/src/graph.rs b/src/graph.rs
new file mode 100644
index 0000000..2170e77
--- /dev/null
+++ b/src/graph.rs
@@ -0,0 +1,586 @@
+use std::{
+    collections::{
+        hash_map::{Iter, IterMut},
+        BinaryHeap, HashMap, HashSet,
+    },
+    hash::Hash,
+    ops::Deref,
+    sync::Arc,
+};
+
+use log::info;
+use serde::{Deserialize, Serialize};
+use tokio::{
+    fs::File,
+    io::{AsyncBufReadExt, AsyncWriteExt, BufReader},
+};
+
+#[derive(Default)]
+pub struct Graph {
+    nodes: BidMap<Object, ObjectRef>,
+    edges: BidThreeMap<ObjectOrSet, Relation, ObjectRef>,
+    counter: u32,
+}
+
+#[derive(Hash, PartialEq, Eq, Clone, Serialize, Deserialize, Debug)]
+pub struct Object {
+    pub namespace: String,
+    pub id: String,
+}
+
+#[derive(Hash, PartialEq, Eq, Clone, Copy, Serialize, Deserialize, Debug)]
+pub struct ObjectRef(pub u32);
+
+#[derive(PartialEq, Eq, Hash, Clone, Debug, Deserialize, Serialize)]
+pub enum ObjectOrSet {
+    Object(ObjectRef),
+    Set((ObjectRef, Relation)),
+}
+
+#[derive(Hash, PartialEq, Eq, Clone, Debug, Serialize, Deserialize)]
+pub struct Relation(String);
+
+#[derive(PartialEq, Eq, Clone, Hash, Serialize, Deserialize, Debug)]
+pub struct ObjectRelation(pub ObjectRef, pub Relation);
+
+impl Object {
+    pub fn new(namespace: &str, id: &str) -> Self {
+        Self {
+            namespace: namespace.to_string(),
+            id: id.to_string(),
+        }
+    }
+}
+
+impl ObjectOrSet {
+    pub fn object_ref(&self) -> &ObjectRef {
+        match self {
+            ObjectOrSet::Object(obj) => obj,
+            ObjectOrSet::Set((obj, _)) => obj,
+        }
+    }
+    pub fn relation(&self) -> Option<&Relation> {
+        match self {
+            ObjectOrSet::Object(_) => None,
+            ObjectOrSet::Set((_, rel)) => Some(rel),
+        }
+    }
+}
+
+impl From<ObjectRef> for ObjectOrSet {
+    fn from(value: ObjectRef) -> Self {
+        Self::Object(value)
+    }
+}
+
+impl From<(ObjectRef, &str)> for ObjectOrSet {
+    fn from(value: (ObjectRef, &str)) -> Self {
+        Self::Set((value.0, Relation::new(value.1)))
+    }
+}
+
+impl Relation {
+    pub fn new(relation: &str) -> Self {
+        Self(relation.to_string())
+    }
+}
+impl Deref for Relation {
+    type Target = String;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl From<(ObjectRef, Relation)> for ObjectRelation {
+    fn from(value: (ObjectRef, Relation)) -> Self {
+        Self(value.0, value.1)
+    }
+}
+impl From<(ObjectRef, &str)> for ObjectRelation {
+    fn from(value: (ObjectRef, &str)) -> Self {
+        Self(value.0, Relation::new(value.1))
+    }
+}
+
+impl Graph {
+    pub fn get_node(&self, namespace: &str, id: &str) -> Option<ObjectRef> {
+        self.nodes.get_by_a(&Object::new(namespace, id)).cloned()
+    }
+    pub fn object_from_ref(&self, obj: &ObjectRef) -> Object {
+        self.nodes.get_by_b(obj).unwrap().clone()
+    }
+    pub fn add_node(&mut self, node: Object) -> ObjectRef {
+        let obj_ref = ObjectRef(self.counter);
+        self.nodes.insert(node, obj_ref);
+        self.counter += 1;
+        obj_ref
+    }
+    pub fn remove_node(&mut self, node: Object) {
+        let index = self.nodes.remove_by_a(&node);
+        if let Some(index) = index {
+            self.edges.remove_by_c(&index);
+            self.edges.get_by_a(&ObjectOrSet::Object(*index));
+            //TODO: remove edges with ObjectOrSet::Set
+        }
+    }
+
+    pub fn has_relation(&self, src: ObjectOrSet, dst: ObjectRelation) -> bool {
+        self.edges.has(&src, &dst.1, &dst.0)
+    }
+    pub fn add_relation(&mut self, src: ObjectOrSet, dst: ObjectRelation) {
+        self.edges.insert(src, dst.1, dst.0);
+    }
+    pub fn remove_relation(&mut self, src: ObjectOrSet, dst: ObjectRelation) {
+        self.edges.remove(&src, &dst.1, &dst.0);
+    }
+
+    pub fn is_related_to(
+        &self,
+        src: impl Into<ObjectOrSet>,
+        dst: impl Into<ObjectRelation>,
+    ) -> bool {
+        let src = src.into();
+        let dst = dst.into();
+        let mut dist: HashMap<ObjectRelation, u32> = HashMap::new();
+        let mut q: BinaryHeap<ObjectRelationDist> = BinaryHeap::new();
+
+        for neighbor in self
+            .edges
+            .get_by_a(&src)
+            .iter()
+            .flat_map(|(r, m)| m.iter().map(|x| ObjectRelation(**x, (**r).clone())))
+        {
+            if neighbor == dst {
+                return true;
+            }
+            dist.insert(neighbor.clone(), 1);
+            q.push(ObjectRelationDist(1, neighbor.clone()));
+        }
+
+        while let Some(ObjectRelationDist(node_dist, node)) = q.pop() {
+            let node_dist = node_dist + 1;
+            let node = ObjectOrSet::Set((node.0, node.1));
+            for neighbor in self
+                .edges
+                .get_by_a(&node)
+                .iter()
+                .flat_map(|(r, m)| m.iter().map(|x| ObjectRelation(**x, (**r).clone())))
+            {
+                if neighbor == dst {
+                    return true;
+                }
+                if let Some(existing_node_dist) = dist.get(&neighbor) {
+                    if *existing_node_dist < node_dist {
+                        continue;
+                    }
+                }
+                dist.insert(neighbor.clone(), node_dist);
+                q.push(ObjectRelationDist(node_dist, neighbor.clone()));
+            }
+        }
+
+        false
+    }
+    pub fn related_to(&self, dst: ObjectRef, relation: Relation) -> HashSet<ObjectRef> {
+        let mut relation_sets = vec![];
+        let mut relations: HashSet<ObjectRef> = HashSet::new();
+        for obj in self.edges.get_by_cb(&dst, &relation) {
+            match obj {
+                ObjectOrSet::Object(obj) => {
+                    relations.insert(*obj);
+                }
+                ObjectOrSet::Set(set) => relation_sets.push(set),
+            }
+        }
+        while let Some(set) = relation_sets.pop() {
+            for obj in self.edges.get_by_cb(&set.0, &set.1) {
+                match obj {
+                    ObjectOrSet::Object(obj) => {
+                        relations.insert(*obj);
+                    }
+                    ObjectOrSet::Set(set) => relation_sets.push(set),
+                }
+            }
+        }
+        relations
+    }
+    pub fn relations(&self, src: impl Into<ObjectRelation>) -> HashSet<ObjectRef> {
+        let src: ObjectRelation = src.into();
+
+        let mut visited = HashSet::new();
+        let mut relation_sets = vec![];
+        let mut relations = HashSet::new();
+
+        for (rel, neighbors) in self.edges.get_by_a(&ObjectOrSet::Object(src.0)) {
+            for neighbor in neighbors {
+                if *rel == src.1 {
+                    relations.insert(*neighbor);
+                }
+                relation_sets.push((rel, neighbor));
+            }
+        }
+
+        while let Some((rel, obj_ref)) = relation_sets.pop() {
+            if !visited.contains(&(rel, obj_ref)) {
+                for (rel, neighbors) in self
+                    .edges
+                    .get_by_a(&ObjectOrSet::Set((*obj_ref, (*rel).clone())))
+                {
+                    for neighbor in neighbors {
+                        if *rel == src.1 {
+                            relations.insert(*neighbor);
+                        }
+                        relation_sets.push((rel, neighbor));
+                    }
+                }
+                visited.insert((rel, obj_ref));
+            }
+        }
+
+        relations
+    }
+
+    pub async fn to_file(&self, file: &mut File) {
+        info!("writing graph to file");
+        for (obj, obj_ref) in self.nodes.iter() {
+            file.write_all(format!("[{}:{}]\n", &obj.namespace, &obj.id).as_bytes())
+                .await
+                .unwrap();
+            for (rel, arr) in self.edges.get_by_c(obj_ref.as_ref()) {
+                let arr = arr
+                    .iter()
+                    .filter_map(|x| {
+                        let obj_ref = x.object_ref();
+                        self.nodes.get_by_b(obj_ref).map(|obj| {
+                            let (namespace, id) = (&obj.namespace, &obj.id);
+
+                            match x.relation() {
+                                None => format!("{}:{}", &namespace, &id),
+                                Some(rel) => format!("{}:{}#{}", &namespace, &id, &rel.0),
+                            }
+                        })
+                    })
+                    .reduce(|acc, e| acc + ", " + &e)
+                    .unwrap_or_default();
+                file.write_all(format!("{} = [{}]\n", &rel.0, &arr).as_bytes())
+                    .await
+                    .unwrap();
+            }
+            file.write_all("\n".as_bytes()).await.unwrap();
+        }
+    }
+
+    pub async fn from_file(file: &mut File) -> Self {
+        info!("reading graph from file");
+        let reader = BufReader::new(file);
+        let mut lines = reader.lines();
+        let mut graph = Graph::default();
+
+        let mut node: Option<ObjectRef> = None;
+        let mut relations = vec![];
+        while let Ok(Some(line)) = lines.next_line().await {
+            if line.starts_with('[') && line.ends_with(']') {
+                let line = &mut line[1..line.len() - 1].split(':');
+                let obj_ref =
+                    graph.add_node(Object::new(line.next().unwrap(), line.next().unwrap()));
+                node = Some(obj_ref);
+            } else if line.contains('=') && line.contains('[') && line.contains(']') {
+                if let Some(dst) = node {
+                    let equals_pos = line.find('=').unwrap();
+                    let arr_start = line.find('[').unwrap();
+                    let arr_stop = line.find(']').unwrap();
+
+                    let rel = line[..equals_pos].trim();
+                    let arr = line[arr_start + 1..arr_stop].split(", ");
+
+                    for obj in arr {
+                        let (src_namespace, src_id, src_rel) = if obj.contains('#') {
+                            let sep_1 = obj.find(':').unwrap();
+                            let sep_2 = obj.find('#').unwrap();
+
+                            let namespace = &obj[..sep_1];
+                            let id = &obj[sep_1 + 1..sep_2];
+                            let rel = &obj[sep_2 + 1..];
+
+                            (namespace, id, Some(rel))
+                        } else {
+                            let sep_1 = obj.find(':').unwrap();
+
+                            let namespace = &obj[..sep_1];
+                            let id = &obj[sep_1 + 1..];
+
+                            (namespace, id, None)
+                        };
+
+                        relations.push((
+                            src_namespace.to_string(),
+                            src_id.to_string(),
+                            src_rel.map(String::from),
+                            dst,
+                            rel.to_string(),
+                        ));
+                    }
+                }
+            }
+        }
+
+        for relation in relations {
+            let src = match relation.2 {
+                Some(rel) => {
+                    let obj = graph.get_node(&relation.0, &relation.1).unwrap();
+                    ObjectOrSet::Set((obj, Relation::new(&rel)))
+                }
+                None => {
+                    let obj = graph.get_node(&relation.0, &relation.1).unwrap();
+                    ObjectOrSet::Object(obj)
+                }
+            };
+            graph.add_relation(src, ObjectRelation(relation.3, Relation(relation.4)));
+        }
+
+        graph
+    }
+}
+
+/// Helper Struct used for Dijkstra
+#[derive(PartialEq, Eq)]
+struct ObjectRelationDist(u32, ObjectRelation);
+
+impl Ord for ObjectRelationDist {
+    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+        other.0.cmp(&self.0)
+    }
+}
+impl PartialOrd for ObjectRelationDist {
+    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+        Some(other.0.cmp(&self.0))
+    }
+}
+
+pub struct BidMap<A, B> {
+    left_to_right: HashMap<Arc<A>, Arc<B>>,
+    right_to_left: HashMap<Arc<B>, Arc<A>>,
+}
+
+impl<A, B> Default for BidMap<A, B> {
+    fn default() -> Self {
+        Self {
+            left_to_right: Default::default(),
+            right_to_left: Default::default(),
+        }
+    }
+}
+
+impl<A, B> BidMap<A, B>
+where
+    A: Eq + Hash,
+    B: Eq + Hash,
+{
+    pub fn new() -> Self {
+        Self {
+            left_to_right: HashMap::new(),
+            right_to_left: HashMap::new(),
+        }
+    }
+
+    pub fn insert(&mut self, a: A, b: B) {
+        let a = Arc::new(a);
+        let b = Arc::new(b);
+        self.left_to_right.insert(a.clone(), b.clone());
+        self.right_to_left.insert(b, a);
+    }
+
+    pub fn remove_by_a(&mut self, a: &A) -> Option<Arc<B>> {
+        if let Some(b) = self.left_to_right.remove(a) {
+            self.right_to_left.remove(&b);
+            Some(b)
+        } else {
+            None
+        }
+    }
+
+    pub fn remove_by_b(&mut self, b: &B) -> Option<Arc<A>> {
+        if let Some(a) = self.right_to_left.remove(b) {
+            self.left_to_right.remove(&a);
+            Some(a)
+        } else {
+            None
+        }
+    }
+
+    pub fn get_by_a(&self, a: &A) -> Option<&B> {
+        self.left_to_right.get(a).map(Deref::deref)
+    }
+
+    pub fn get_by_b(&self, b: &B) -> Option<&A> {
+        self.right_to_left.get(b).map(Deref::deref)
+    }
+
+    pub fn iter(&self) -> Iter<Arc<A>, Arc<B>> {
+        self.left_to_right.iter()
+    }
+
+    pub fn iter_mut(&mut self) -> IterMut<Arc<A>, Arc<B>> {
+        self.left_to_right.iter_mut()
+    }
+}
+
+pub struct BidThreeMap<A, B, C> {
+    left_to_right: HashMap<Arc<A>, HashMap<Arc<B>, HashSet<Arc<C>>>>,
+    right_to_left: HashMap<Arc<C>, HashMap<Arc<B>, HashSet<Arc<A>>>>,
+}
+
+impl<A, B, C> BidThreeMap<A, B, C>
+where
+    A: Eq + Hash,
+    B: Eq + Hash,
+    C: Eq + Hash,
+{
+    pub fn new() -> Self {
+        Self {
+            left_to_right: HashMap::new(),
+            right_to_left: HashMap::new(),
+        }
+    }
+
+    pub fn insert(&mut self, a: A, b: B, c: C) {
+        let a = Arc::new(a);
+        let b = Arc::new(b);
+        let c = Arc::new(c);
+
+        if let Some(middle) = self.left_to_right.get_mut(&a) {
+            if let Some(right) = middle.get_mut(&b) {
+                right.insert(c.clone());
+            } else {
+                let mut right = HashSet::new();
+                right.insert(c.clone());
+                middle.insert(b.clone(), right);
+            }
+        } else {
+            let mut middle = HashMap::new();
+            let mut right = HashSet::new();
+            right.insert(c.clone());
+            middle.insert(b.clone(), right);
+            self.left_to_right.insert(a.clone(), middle);
+        }
+
+        if let Some(middle) = self.right_to_left.get_mut(&c) {
+            if let Some(left) = middle.get_mut(&b) {
+                left.insert(a);
+            } else {
+                let mut left = HashSet::new();
+                left.insert(a);
+                middle.insert(b, left);
+            }
+        } else {
+            let mut middle = HashMap::new();
+            let mut left = HashSet::new();
+            left.insert(a);
+            middle.insert(b, left);
+            self.right_to_left.insert(c, middle);
+        }
+    }
+
+    pub fn remove(&mut self, a: &A, b: &B, c: &C) {
+        if let Some(right) = self.left_to_right.get_mut(a).and_then(|ltr| ltr.get_mut(b)) {
+            right.remove(c);
+        }
+        if let Some(left) = self.right_to_left.get_mut(c).and_then(|rtl| rtl.get_mut(b)) {
+            left.remove(a);
+        }
+    }
+
+    pub fn remove_by_a(&mut self, a: &A) {
+        if let Some(map) = self.left_to_right.remove(a) {
+            for (b, set) in map {
+                for c in set {
+                    if let Some(set) = self
+                        .right_to_left
+                        .get_mut(&c)
+                        .and_then(|ltr| ltr.get_mut(&b))
+                    {
+                        set.remove(a);
+                    }
+                }
+            }
+        }
+    }
+
+    pub fn remove_by_c(&mut self, c: &C) {
+        if let Some(map) = self.right_to_left.remove(c) {
+            for (b, set) in map {
+                for a in set {
+                    if let Some(set) = self
+                        .left_to_right
+                        .get_mut(&a)
+                        .and_then(|ltr| ltr.get_mut(&b))
+                    {
+                        set.remove(c);
+                    }
+                }
+            }
+        }
+    }
+
+    pub fn has(&self, a: &A, b: &B, c: &C) -> bool {
+        self.left_to_right
+            .get(a)
+            .and_then(|ltr| ltr.get(b))
+            .and_then(|ltr| ltr.get(c))
+            .is_some()
+    }
+
+    pub fn get_by_ab(&self, a: &A, b: &B) -> HashSet<&C> {
+        self.left_to_right
+            .get(a)
+            .and_then(|ltr| ltr.get(b))
+            .map(|ltr| ltr.iter().map(|x| x.as_ref()).collect::<HashSet<_>>())
+            .unwrap_or_default()
+    }
+
+    pub fn get_by_cb(&self, c: &C, b: &B) -> HashSet<&A> {
+        self.right_to_left
+            .get(c)
+            .and_then(|rtl| rtl.get(b))
+            .map(|rtl| rtl.iter().map(|x| x.as_ref()).collect::<HashSet<_>>())
+            .unwrap_or_default()
+    }
+
+    pub fn get_by_a(&self, a: &A) -> HashMap<&B, HashSet<&C>> {
+        self.left_to_right
+            .get(a)
+            .iter()
+            .flat_map(|x| x.iter())
+            .map(|(b, c)| {
+                (
+                    b.as_ref(),
+                    c.iter().map(|x| x.as_ref()).collect::<HashSet<&C>>(),
+                )
+            })
+            .collect::<_>()
+    }
+
+    pub fn get_by_c(&self, c: &C) -> HashMap<&B, HashSet<&A>> {
+        self.right_to_left
+            .get(c)
+            .iter()
+            .flat_map(|x| x.iter())
+            .map(|(b, a)| {
+                (
+                    b.as_ref(),
+                    a.iter().map(|x| x.as_ref()).collect::<HashSet<&A>>(),
+                )
+            })
+            .collect::<_>()
+    }
+}
+
+impl<A, B, C> Default for BidThreeMap<A, B, C> {
+    fn default() -> Self {
+        Self {
+            left_to_right: Default::default(),
+            right_to_left: Default::default(),
+        }
+    }
+}
diff --git a/src/graph_permissions.rs b/src/graph_permissions.rs
new file mode 100644
index 0000000..4af7974
--- /dev/null
+++ b/src/graph_permissions.rs
@@ -0,0 +1 @@
+tonic::include_proto!("eu.zettoit.graph");
diff --git a/src/grpc_service.rs b/src/grpc_service.rs
new file mode 100644
index 0000000..4c26440
--- /dev/null
+++ b/src/grpc_service.rs
@@ -0,0 +1,230 @@
+use std::sync::Arc;
+
+use log::info;
+use tokio::sync::mpsc::Sender;
+use tokio::sync::Mutex;
+use tonic::{Request, Response, Status};
+
+use crate::graph::{self, Graph, ObjectRelation};
+use crate::graph_permissions::{
+    object_service_server::ObjectService, query_service_server::QueryService, relation::Src,
+    relation_service_server::RelationService, Empty, ExistsResponse, GetRelatedToResponse,
+    GetRelationsRequest, GetRelationsResponse, IsRelatedToResponse, Object, Relation, Set,
+};
+
+#[derive(Clone)]
+pub struct GraphService {
+    pub graph: Arc<Mutex<Graph>>,
+    pub save_trigger: Sender<()>,
+}
+
+#[tonic::async_trait]
+impl ObjectService for GraphService {
+    async fn create(&self, request: Request<Object>) -> Result<Response<Empty>, Status> {
+        let mut graph = self.graph.lock().await;
+
+        if request.get_ref().namespace.is_empty() || request.get_ref().id.is_empty() {
+            return Err(Status::invalid_argument("namespace and id must be set"));
+        }
+
+        graph.add_node(graph::Object::new(
+            &request.get_ref().namespace,
+            &request.get_ref().id,
+        ));
+
+        info!(
+            "created object {}:{}",
+            &request.get_ref().namespace,
+            &request.get_ref().id
+        );
+
+        self.save_trigger.send(()).await.unwrap();
+
+        Ok(Response::new(Empty {}))
+    }
+    async fn delete(&self, request: Request<Object>) -> Result<Response<Empty>, Status> {
+        let mut graph = self.graph.lock().await;
+
+        if request.get_ref().namespace.is_empty() || request.get_ref().id.is_empty() {
+            return Err(Status::invalid_argument("namespace and id must be set"));
+        }
+
+        graph.remove_node(graph::Object::new(
+            &request.get_ref().namespace,
+            &request.get_ref().id,
+        ));
+
+        info!(
+            "removed object {}:{}",
+            &request.get_ref().namespace,
+            &request.get_ref().id
+        );
+
+        self.save_trigger.send(()).await.unwrap();
+
+        Ok(Response::new(Empty {}))
+    }
+    async fn exists(&self, request: Request<Object>) -> Result<Response<ExistsResponse>, Status> {
+        let graph = self.graph.lock().await;
+
+        if request.get_ref().namespace.is_empty() || request.get_ref().id.is_empty() {
+            return Err(Status::invalid_argument("namespace and id must be set"));
+        }
+
+        let exists = graph
+            .get_node(&request.get_ref().namespace, &request.get_ref().id)
+            .is_some();
+
+        Ok(Response::new(ExistsResponse { exists }))
+    }
+}
+
+#[tonic::async_trait]
+impl RelationService for GraphService {
+    async fn create(&self, request: Request<Relation>) -> Result<Response<Empty>, Status> {
+        let mut graph = self.graph.lock().await;
+
+        let (src, dst) = transform_relation(request.get_ref(), &graph)?;
+
+        graph.add_relation(src, dst);
+
+        info!("created relation");
+
+        self.save_trigger.send(()).await.unwrap();
+
+        Ok(Response::new(Empty {}))
+    }
+    async fn delete(&self, request: Request<Relation>) -> Result<Response<Empty>, Status> {
+        let mut graph = self.graph.lock().await;
+
+        let (src, dst) = transform_relation(request.get_ref(), &graph)?;
+
+        graph.remove_relation(src, dst);
+
+        info!("removed relation relation");
+
+        self.save_trigger.send(()).await.unwrap();
+
+        Ok(Response::new(Empty {}))
+    }
+    async fn exists(&self, request: Request<Relation>) -> Result<Response<ExistsResponse>, Status> {
+        let graph = self.graph.lock().await;
+
+        let (src, dst) = transform_relation(request.get_ref(), &graph)?;
+
+        let exists = graph.has_relation(src, dst);
+
+        Ok(Response::new(ExistsResponse { exists }))
+    }
+}
+
+#[tonic::async_trait]
+impl QueryService for GraphService {
+    async fn is_related_to(
+        &self,
+        request: Request<Relation>,
+    ) -> Result<Response<IsRelatedToResponse>, Status> {
+        let graph = self.graph.lock().await;
+
+        let (src, dst) = transform_relation(request.get_ref(), &graph)?;
+
+        let related = graph.is_related_to(src, dst);
+
+        Ok(Response::new(IsRelatedToResponse { related }))
+    }
+    async fn get_related_to(
+        &self,
+        request: Request<Set>,
+    ) -> Result<Response<GetRelatedToResponse>, Status> {
+        let graph = self.graph.lock().await;
+
+        let obj = graph
+            .get_node(&request.get_ref().namespace, &request.get_ref().id)
+            .ok_or(Status::not_found("object not found"))?;
+        let rel = graph::Relation::new(&request.get_ref().relation);
+
+        Ok(Response::new(GetRelatedToResponse {
+            objects: graph
+                .related_to(obj, rel)
+                .into_iter()
+                .map(|x| {
+                    let obj = graph.object_from_ref(&x);
+                    Object {
+                        namespace: obj.namespace.to_string(),
+                        id: obj.id,
+                    }
+                })
+                .collect::<Vec<_>>(),
+        }))
+    }
+    async fn get_relations(
+        &self,
+        request: Request<GetRelationsRequest>,
+    ) -> Result<Response<GetRelationsResponse>, Status> {
+        let graph = self.graph.lock().await;
+
+        if request.get_ref().relation.is_empty() {
+            return Err(Status::invalid_argument("relation must be set"));
+        }
+
+        let obj = request
+            .get_ref()
+            .object
+            .as_ref()
+            .ok_or(Status::invalid_argument("object must be set"))?;
+        let obj = graph
+            .get_node(&obj.namespace, &obj.id)
+            .ok_or(Status::not_found("object not found"))?;
+
+        Ok(Response::new(GetRelationsResponse {
+            objects: graph
+                .relations(ObjectRelation(
+                    obj,
+                    graph::Relation::new(&request.get_ref().relation),
+                ))
+                .into_iter()
+                .map(|x| {
+                    let obj = graph.object_from_ref(&x);
+                    Object {
+                        namespace: obj.namespace.to_string(),
+                        id: obj.id,
+                    }
+                })
+                .collect::<Vec<_>>(),
+        }))
+    }
+}
+
+fn transform_relation(
+    rel: &Relation,
+    graph: &Graph,
+) -> Result<(graph::ObjectOrSet, graph::ObjectRelation), Status> {
+    let src = match rel
+        .src
+        .as_ref()
+        .ok_or(Status::invalid_argument("src must be set"))?
+    {
+        Src::SrcObj(object) => graph::ObjectOrSet::Object(
+            graph
+                .get_node(&object.namespace, &object.id)
+                .ok_or(Status::not_found("src object could not be found"))?,
+        ),
+        Src::SrcSet(set) => graph::ObjectOrSet::Set((
+            graph
+                .get_node(&set.namespace, &set.id)
+                .ok_or(Status::not_found("src object could not be found"))?,
+            graph::Relation::new(&set.relation),
+        )),
+    };
+
+    let dst = rel
+        .dst
+        .as_ref()
+        .ok_or(Status::invalid_argument("dst must be set"))?;
+    let dst = graph
+        .get_node(&dst.namespace, &dst.id)
+        .ok_or(Status::not_found("dst object could not be found"))?;
+    let dst = ObjectRelation(dst, graph::Relation::new(&rel.relation));
+
+    Ok((src, dst))
+}
diff --git a/src/kafka_backend.rs b/src/kafka_backend.rs
new file mode 100644
index 0000000..a0f77e3
--- /dev/null
+++ b/src/kafka_backend.rs
@@ -0,0 +1,145 @@
+use std::{sync::Arc, time::Duration};
+
+use kafka::{
+    consumer::{Consumer, FetchOffset},
+    producer::{Producer, Record, RequiredAcks},
+};
+use log::debug;
+use serde::{Deserialize, Serialize};
+use tokio::{
+    runtime::Runtime,
+    sync::{mpsc, RwLock},
+    task::JoinHandle,
+};
+
+use crate::{
+    graph::{Graph, ObjectRelation},
+    object::{Object, ObjectOrSet, ObjectRef},
+};
+
+#[derive(Serialize, Deserialize, Debug)]
+pub enum Event {
+    AddObject(Object),
+    RemoveObject(Object),
+    AddRelation((ObjectOrSet, ObjectRelation)),
+    RemoveRelation((ObjectOrSet, ObjectRelation)),
+}
+
+pub struct GraphProxy {
+    graph: Arc<RwLock<Graph>>,
+    producer_thread: JoinHandle<()>,
+    producer_tx: mpsc::Sender<Event>,
+    consumer_thread: JoinHandle<()>,
+}
+impl GraphProxy {
+    pub async fn run() -> Self {
+        let graph = Arc::new(RwLock::new(Graph::default()));
+        let (producer_tx, mut producer_rx) = mpsc::channel(1024);
+
+        let mut producer = Producer::from_hosts(vec!["localhost:9092".to_owned()])
+            .with_ack_timeout(Duration::from_secs(1))
+            .with_required_acks(RequiredAcks::One)
+            .create()
+            .unwrap();
+
+        let producer_thread = tokio::spawn(async move {
+            loop {
+                if let Some(event) = producer_rx.recv().await {
+                    let ser_event = serde_cbor::to_vec(&event).unwrap();
+                    producer
+                        .send(&Record::from_value("gpm", ser_event))
+                        .unwrap();
+                    debug!("emitted Event: {:?}", event);
+                }
+            }
+        });
+
+        let mut consumer = Consumer::from_hosts(vec!["localhost:9092".to_string()])
+            .with_client_id("gpm_dev".to_string())
+            .with_topic("gpm".to_string())
+            .with_fallback_offset(FetchOffset::Earliest)
+            .create()
+            .unwrap();
+        let consumer_graph = graph.clone();
+        let consumer_thread = tokio::task::spawn_blocking(move || {
+            let runtime = Runtime::new().unwrap();
+            loop {
+                for msg_sets in consumer.poll().unwrap().iter() {
+                    for msg in msg_sets.messages() {
+                        let event: Event = serde_cbor::from_slice(msg.value).unwrap();
+                        debug!("received Event: {:?}", event);
+                        let mut graph = runtime.block_on(consumer_graph.write());
+                        match event {
+                            Event::AddObject(obj) => {
+                                graph.add_node(obj);
+                            }
+                            Event::RemoveObject(obj) => {
+                                graph.remove_node(obj);
+                            }
+                            Event::AddRelation((src, dst)) => {
+                                graph.add_relation(src, dst);
+                            }
+                            Event::RemoveRelation((src, dst)) => {
+                                graph.remove_relation(src, dst);
+                            }
+                        };
+                    }
+                    consumer.consume_messageset(msg_sets).unwrap();
+                }
+                consumer.commit_consumed().unwrap();
+            }
+        });
+
+        Self {
+            graph,
+            producer_thread,
+            producer_tx,
+            consumer_thread,
+        }
+    }
+
+    pub fn stop(&mut self) {
+        self.producer_thread.abort();
+        self.consumer_thread.abort();
+    }
+
+    pub async fn add_node(&mut self, node: Object) {
+        self.producer_tx.send(Event::AddObject(node)).await.unwrap();
+    }
+    pub async fn remove_node(&mut self, node: Object) {
+        self.producer_tx
+            .send(Event::RemoveObject(node))
+            .await
+            .unwrap();
+    }
+    pub async fn add_relation(&mut self, src: ObjectOrSet, dst: ObjectRelation) {
+        self.producer_tx
+            .send(Event::AddRelation((src, dst)))
+            .await
+            .unwrap();
+    }
+    pub async fn remove_relation(&mut self, src: ObjectOrSet, dst: ObjectRelation) {
+        self.producer_tx
+            .send(Event::RemoveRelation((src, dst)))
+            .await
+            .unwrap();
+    }
+
+    pub async fn get_node(&self, namespace: &str, id: &str) -> Option<ObjectRef> {
+        let graph = self.graph.read().await;
+        graph.get_node(namespace, id)
+    }
+
+    pub async fn is_related_to(
+        &self,
+        src: impl Into<ObjectOrSet>,
+        dst: impl Into<ObjectRelation>,
+    ) -> bool {
+        let graph = self.graph.read().await;
+        graph.is_related_to(src, dst)
+    }
+    pub async fn related_by(&self, src: impl Into<ObjectRelation>) -> Vec<ObjectOrSet> {
+        let graph = self.graph.read().await;
+        graph.related_by(src)
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..19f9131
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,62 @@
+use std::{sync::Arc, time::Duration};
+
+use graph::Graph;
+use grpc_service::GraphService;
+use tokio::{
+    fs::{self, File},
+    select,
+    sync::{mpsc::channel, Mutex},
+};
+use tonic::transport::Server;
+
+pub mod graph;
+pub mod graph_permissions;
+pub mod grpc_service;
+
+use crate::graph_permissions::{
+    object_service_server::ObjectServiceServer, query_service_server::QueryServiceServer,
+    relation_service_server::RelationServiceServer,
+};
+
+#[tokio::main]
+async fn main() {
+    dotenvy::dotenv().ok();
+    pretty_env_logger::init();
+
+    let graph = if let Ok(mut file) = File::open("graph.dat").await {
+        Graph::from_file(&mut file).await
+    } else {
+        Graph::default()
+    };
+
+    let graph = Arc::new(Mutex::new(graph));
+
+    let (save_tx, mut save_rx) = channel::<()>(32);
+    let save_thread_graph = graph.clone();
+    tokio::spawn(async move {
+        loop {
+            select! {
+                _ = tokio::time::sleep(Duration::from_secs(30)) => {}
+                _ = save_rx.recv() => {}
+            };
+            let graph = save_thread_graph.lock().await;
+
+            let _ = fs::copy("graph.dat", "graph.dat.bak").await;
+            let mut file = File::create("graph.dat").await.unwrap();
+            graph.to_file(&mut file).await;
+        }
+    });
+
+    let graph_service = GraphService {
+        graph: graph.clone(),
+        save_trigger: save_tx.clone(),
+    };
+
+    Server::builder()
+        .add_service(ObjectServiceServer::new(graph_service.clone()))
+        .add_service(RelationServiceServer::new(graph_service.clone()))
+        .add_service(QueryServiceServer::new(graph_service))
+        .serve("0.0.0.0:50051".parse().unwrap())
+        .await
+        .unwrap()
+}