Merge pull request #2 from n1c00o/snowflake-grpc

merge working gRPC-based Snowflake generator

14 files changed, 1481 insertions, 1 deletions

diff --git a/.dockerignore b/.dockerignore
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index 0000000..206d2d0
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..fc0bc98
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,23 @@
+[package]
+name = "clawflake"
+version = "0.1.0"
+edition = "2018"
+
+[[bin]] # Bin to run the HelloWorld gRPC server
+name = "clawflake-server"
+path = "src/server.rs"
+
+[[bin]] # Bin to run the HelloWorld gRPC client
+name = "clawflake-client"
+path = "src/client.rs"
+
+[dependencies]
+chrono = "0.4.19"
+parking_lot = "0.11.1"
+tonic = "0.5"
+tonic-health = "0.4.0"
+prost = "0.8"
+tokio = { version = "1.0", features = ["macros", "rt-multi-thread"] }
+
+[build-dependencies]
+tonic-build = "0.5"
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..0ed7a69
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,9 @@
+FROM rustlang/rust:nightly-slim AS build
+WORKDIR /app
+COPY . /app
+RUN cargo build --release --bin clawflake-server
+
+FROM gcr.io/distroless/cc
+WORKDIR /app
+COPY --from=build /app/target/release/clawflake-server ./
+CMD [ "./clawflake-server" ]
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..3c735d1
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
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+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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diff --git a/README.md b/README.md
index f52d54e..ffb5d18 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,31 @@
 # Clawflake
 
-🦀 Rust-based Snowflake generator on a gRPC server
\ No newline at end of file
+Clawflake is a Rust application which implements [Twitter's Snowflake](https://github.com/twitter-archive/snowflake/tree/snowflake-2010) and communicates using [gRPC](https://grpc.io/).
+
+Snowflake ID numbers are 63 bits integers stored as `i64`.
+
+An ID number is composed of:
+
+- a timestamp (which is the difference between the current time and the epoch) [`41 bits`]
+- a configured machine ID (Data center ID and Worker ID) [`10 bits`]
+- a sequence number which rolls over every 4096 per machine (with protection to avoid rollover in the same ms) [`12 bits`]
+
+## Usage
+
+> You need to use the nightly toolchain!
+
+Build the container
+
+```sh
+docker build --tag clawflake:1.0 .
+```
+
+Run the container
+
+```sh
+docker run -e CLAWFLAKE_EPOCH=<epoch> -e CLAWFLAKE_WORKER_ID=<worker_id> -e CLAWFLAKE_DATACENTER_ID=<datacenter_id> -p <host port>:50051 clawflake:1.0
+```
+
+You can then create your client using [clawflake.rs](clawflake.rs) and start communicate with the service.
+
+An example client can be found [here](src/client.rs)!
diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..670350f
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,12 @@
+use std::path::PathBuf;
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    tonic_build::compile_protos("proto/clawflake.proto")?;
+
+    tonic_build::configure()
+        .out_dir(PathBuf::from("./"))
+        .build_server(false)
+        .compile(&["proto/clawflake.proto"], &["proto"])
+        .unwrap();
+    Ok(())
+}
diff --git a/clawflake.rs b/clawflake.rs
new file mode 100644
index 0000000..c3c894b
--- /dev/null
+++ b/clawflake.rs
@@ -0,0 +1,83 @@
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct IdRequest {}
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct IdReply {
+    #[prost(string, tag = "1")]
+    pub id: ::prost::alloc::string::String,
+}
+#[doc = r" Generated client implementations."]
+pub mod clawflake_client {
+    #![allow(unused_variables, dead_code, missing_docs, clippy::let_unit_value)]
+    use tonic::codegen::*;
+    #[derive(Debug, Clone)]
+    pub struct ClawflakeClient<T> {
+        inner: tonic::client::Grpc<T>,
+    }
+    impl ClawflakeClient<tonic::transport::Channel> {
+        #[doc = r" Attempt to create a new client by connecting to a given endpoint."]
+        pub async fn connect<D>(dst: D) -> Result<Self, tonic::transport::Error>
+        where
+            D: std::convert::TryInto<tonic::transport::Endpoint>,
+            D::Error: Into<StdError>,
+        {
+            let conn = tonic::transport::Endpoint::new(dst)?.connect().await?;
+            Ok(Self::new(conn))
+        }
+    }
+    impl<T> ClawflakeClient<T>
+    where
+        T: tonic::client::GrpcService<tonic::body::BoxBody>,
+        T::ResponseBody: Body + Send + Sync + 'static,
+        T::Error: Into<StdError>,
+        <T::ResponseBody as Body>::Error: Into<StdError> + Send,
+    {
+        pub fn new(inner: T) -> Self {
+            let inner = tonic::client::Grpc::new(inner);
+            Self { inner }
+        }
+        pub fn with_interceptor<F>(
+            inner: T,
+            interceptor: F,
+        ) -> ClawflakeClient<InterceptedService<T, F>>
+        where
+            F: FnMut(tonic::Request<()>) -> Result<tonic::Request<()>, tonic::Status>,
+            T: tonic::codegen::Service<
+                http::Request<tonic::body::BoxBody>,
+                Response = http::Response<
+                    <T as tonic::client::GrpcService<tonic::body::BoxBody>>::ResponseBody,
+                >,
+            >,
+            <T as tonic::codegen::Service<http::Request<tonic::body::BoxBody>>>::Error:
+                Into<StdError> + Send + Sync,
+        {
+            ClawflakeClient::new(InterceptedService::new(inner, interceptor))
+        }
+        #[doc = r" Compress requests with `gzip`."]
+        #[doc = r""]
+        #[doc = r" This requires the server to support it otherwise it might respond with an"]
+        #[doc = r" error."]
+        pub fn send_gzip(mut self) -> Self {
+            self.inner = self.inner.send_gzip();
+            self
+        }
+        #[doc = r" Enable decompressing responses with `gzip`."]
+        pub fn accept_gzip(mut self) -> Self {
+            self.inner = self.inner.accept_gzip();
+            self
+        }
+        pub async fn get_id(
+            &mut self,
+            request: impl tonic::IntoRequest<super::IdRequest>,
+        ) -> Result<tonic::Response<super::IdReply>, tonic::Status> {
+            self.inner.ready().await.map_err(|e| {
+                tonic::Status::new(
+                    tonic::Code::Unknown,
+                    format!("Service was not ready: {}", e.into()),
+                )
+            })?;
+            let codec = tonic::codec::ProstCodec::default();
+            let path = http::uri::PathAndQuery::from_static("/clawflake.Clawflake/GetID");
+            self.inner.unary(request.into_request(), path, codec).await
+        }
+    }
+}
diff --git a/proto/clawflake.proto b/proto/clawflake.proto
new file mode 100644
index 0000000..5eb9018
--- /dev/null
+++ b/proto/clawflake.proto
@@ -0,0 +1,12 @@
+syntax = "proto3";
+package clawflake;
+
+service Clawflake {
+    rpc GetID(IDRequest) returns (IDReply);
+}
+
+message IDRequest {}
+
+message IDReply {
+    string id = 1;
+}
diff --git a/scripts/health_check.sh b/scripts/health_check.sh
new file mode 100644
index 0000000..df89d42
--- /dev/null
+++ b/scripts/health_check.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+# requires https://github.com/grpc-ecosystem/grpc-health-probe
+grpc_health_probe -addr=\[::1]:50051 -service=clawflake.Clawflake
diff --git a/src/client.rs b/src/client.rs
new file mode 100644
index 0000000..75b4c8f
--- /dev/null
+++ b/src/client.rs
@@ -0,0 +1,25 @@
+// !Sample implementation of a gRPC Client for Clawflake, not meant to production!
+
+pub mod clawflake {
+  tonic::include_proto!("clawflake");
+}
+
+use clawflake::clawflake_client::ClawflakeClient;
+use clawflake::IdRequest;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let addr = "http://[::0]:50051";
+
+    let mut client = ClawflakeClient::connect(addr).await?;
+
+    println!("Client connected to {}", addr);
+    let request = tonic::Request::new(IdRequest {});
+
+    println!("Trying to get an ID");
+    let response = client.get_id(request).await?;
+
+    println!("Received: {:?}", response);
+
+    Ok(())
+}
diff --git a/src/id_worker.rs b/src/id_worker.rs
new file mode 100644
index 0000000..248559f
--- /dev/null
+++ b/src/id_worker.rs
@@ -0,0 +1,62 @@
+use chrono::Utc;
+use parking_lot::Mutex;
+use std::sync::Arc;
+
+#[derive(Default)]
+#[derive(Debug)]
+pub struct IdWorker {
+    epoch: i64,
+    worker_id: i64,
+    datacenter_id: i64,
+    sequence: i64,
+    time: Arc<Mutex<i64>>,
+}
+
+impl IdWorker {
+    pub fn new(epoch: i64, worker_id: i64, datacenter_id: i64) -> IdWorker {
+      IdWorker {
+            epoch,
+            worker_id,
+            datacenter_id,
+            sequence: 0,
+            time: Arc::new(Mutex::new(0)),
+        }
+    }
+
+    #[allow(dead_code)]
+    pub fn epoch(&mut self, epoch: i64) -> &mut Self {
+        self.epoch = epoch;
+        self
+    }
+
+    #[allow(dead_code)]
+    pub fn worker_id(&mut self, worker_id: i64) -> &mut Self {
+        self.worker_id = worker_id;
+        self
+    }
+
+    #[allow(dead_code)]
+    pub fn datacenter_id(&mut self, datacenter_id: i64) -> &mut Self {
+        self.datacenter_id = datacenter_id;
+        self
+    }
+
+    pub fn next_id(&mut self) -> i64 {
+        let mut last_timestamp = self.time.lock();
+        let mut timestamp = self.get_time();
+        if timestamp == *last_timestamp {
+            self.sequence = (self.sequence + 1) & (-1 ^ (-1 << 12));
+            if self.sequence == 0 && timestamp <= *last_timestamp {
+                timestamp = self.get_time();
+            }
+        } else {
+            self.sequence = 0;
+        }
+        *last_timestamp = timestamp;
+        (timestamp << 22) | (self.worker_id << 17) | (self.datacenter_id << 12) | self.sequence
+    }
+
+    fn get_time(&self) -> i64 {
+        Utc::now().timestamp_millis() - self.epoch
+    }
+}
diff --git a/src/server.rs b/src/server.rs
new file mode 100644
index 0000000..16cc044
--- /dev/null
+++ b/src/server.rs
@@ -0,0 +1,63 @@
+pub mod clawflake {
+    tonic::include_proto!("clawflake");
+}
+use clawflake::clawflake_server::{Clawflake, ClawflakeServer};
+use clawflake::{IdReply, IdRequest};
+
+mod id_worker;
+use id_worker::IdWorker;
+
+use std::env;
+use std::net::SocketAddr;
+use tonic::{transport::Server, Request, Response, Status};
+
+#[derive(Debug, Default)]
+pub struct MyClawflakeService {}
+
+#[tonic::async_trait]
+impl Clawflake for MyClawflakeService {
+    async fn get_id(&self, _: Request<IdRequest>) -> Result<Response<IdReply>, Status> {
+        let mut worker: IdWorker = IdWorker::new(
+            env::var("CLAWFLAKE_EPOCH")
+                .expect("Missing env `CLAWFLAKE_EPOCH`")
+                .parse::<i64>()
+                .unwrap(),
+            env::var("CLAWFLAKE_WORKER_ID")
+                .expect("Missing env `CLAWFLAKE_WORKER_ID`")
+                .parse::<i64>()
+                .unwrap(),
+            env::var("CLAWFLAKE_DATACENTER_ID")
+                .expect("Missing env `CLAWFLAKE_DATACENTER_ID`")
+                .parse::<i64>()
+                .unwrap(),
+        );
+
+        let reply: IdReply = clawflake::IdReply {
+            id: format!("{}", worker.next_id()).into(),
+        };
+
+        Ok(Response::new(reply))
+    }
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // init tonic_health
+    let (mut health_reporter, health_service) = tonic_health::server::health_reporter();
+    health_reporter
+        .set_serving::<ClawflakeServer<MyClawflakeService>>()
+        .await;
+
+    // init tonic and IdWorker
+    let addr: SocketAddr = "[::0]:50051".parse()?;
+    let srv: MyClawflakeService = MyClawflakeService::default();
+
+    println!("Server listening on {}", addr);
+
+    Server::builder()
+        .add_service(health_service)
+        .add_service(ClawflakeServer::new(srv))
+        .serve(addr)
+        .await?;
+    Ok(())
+}