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use std::collections::HashMap;
use std::ptr;
use std::sync::Arc;
use std::sync::atomic::{AtomicBool, Ordering};
use std::fmt;
use std::fmt::{Debug, Formatter};
use futures::{Async, Future, Poll};
use grpc_sys::{self, GrpcCallStatus, GrpcServer};
use RpcContext;
use async::{CallTag, CqFuture};
use call::{Method, MethodType};
use call::server::*;
use channel::ChannelArgs;
use cq::CompletionQueue;
use env::Environment;
use error::{Error, Result};
const DEFAULT_REQUEST_SLOTS_PER_CQ: usize = 1024;
pub type CallBack = Box<Fn(RpcContext, &[u8])>;
pub struct Handler {
method_type: MethodType,
cb: CallBack,
}
impl Handler {
pub fn new(method_type: MethodType, cb: CallBack) -> Handler {
Handler {
method_type: method_type,
cb: cb,
}
}
pub fn cb(&self) -> &CallBack {
&self.cb
}
pub fn method_type(&self) -> MethodType {
self.method_type
}
}
#[cfg(feature = "secure")]
mod imp {
use grpc_sys::{self, GrpcServer};
use credentials::ServerCredentials;
pub struct Binder {
pub host: String,
pub port: u16,
cred: Option<ServerCredentials>,
}
impl Binder {
pub fn new(host: String, port: u16) -> Binder {
let cred = None;
Binder { host, port, cred }
}
pub fn with_cred(host: String, port: u16, cred: ServerCredentials) -> Binder {
let cred = Some(cred);
Binder { host, port, cred }
}
pub unsafe fn bind(&mut self, server: *mut GrpcServer) -> u16 {
let addr = format!("{}:{}\0", self.host, self.port);
let port = match self.cred.take() {
None => grpc_sys::grpc_server_add_insecure_http2_port(server, addr.as_ptr() as _),
Some(mut cert) => grpc_sys::grpc_server_add_secure_http2_port(
server,
addr.as_ptr() as _,
cert.as_mut_ptr(),
),
};
port as u16
}
}
}
#[cfg(not(feature = "secure"))]
mod imp {
use grpc_sys::{self, GrpcServer};
pub struct Binder {
pub host: String,
pub port: u16,
}
impl Binder {
pub fn new(host: String, port: u16) -> Binder {
Binder { host, port }
}
pub unsafe fn bind(&mut self, server: *mut GrpcServer) -> u16 {
let addr = format!("{}:{}\0", self.host, self.port);
grpc_sys::grpc_server_add_insecure_http2_port(server, addr.as_ptr() as _) as u16
}
}
}
use self::imp::Binder;
pub struct ServiceBuilder {
handlers: HashMap<&'static [u8], Handler>,
}
impl ServiceBuilder {
pub fn new() -> ServiceBuilder {
ServiceBuilder {
handlers: HashMap::new(),
}
}
pub fn add_unary_handler<P, Q, F>(mut self, method: &Method<P, Q>, handler: F) -> ServiceBuilder
where
P: 'static,
Q: 'static,
F: Fn(RpcContext, P, UnarySink<Q>) + 'static,
{
let (ser, de) = (method.resp_ser(), method.req_de());
let h = Box::new(move |ctx: RpcContext, payload: &[u8]| {
execute_unary(ctx, ser, de, payload, &handler)
});
self.handlers
.insert(method.name.as_bytes(), Handler::new(MethodType::Unary, h));
self
}
pub fn add_client_streaming_handler<P, Q, F>(
mut self,
method: &Method<P, Q>,
handler: F,
) -> ServiceBuilder
where
P: 'static,
Q: 'static,
F: Fn(RpcContext, RequestStream<P>, ClientStreamingSink<Q>) + 'static,
{
let (ser, de) = (method.resp_ser(), method.req_de());
let h = Box::new(move |ctx: RpcContext, _: &[u8]| {
execute_client_streaming(ctx, ser, de, &handler)
});
self.handlers.insert(
method.name.as_bytes(),
Handler::new(MethodType::ClientStreaming, h),
);
self
}
pub fn add_server_streaming_handler<P, Q, F>(
mut self,
method: &Method<P, Q>,
handler: F,
) -> ServiceBuilder
where
P: 'static,
Q: 'static,
F: Fn(RpcContext, P, ServerStreamingSink<Q>) + 'static,
{
let (ser, de) = (method.resp_ser(), method.req_de());
let h = Box::new(move |ctx: RpcContext, payload: &[u8]| {
execute_server_streaming(ctx, ser, de, payload, &handler)
});
self.handlers.insert(
method.name.as_bytes(),
Handler::new(MethodType::ServerStreaming, h),
);
self
}
pub fn add_duplex_streaming_handler<P, Q, F>(
mut self,
method: &Method<P, Q>,
handler: F,
) -> ServiceBuilder
where
P: 'static,
Q: 'static,
F: Fn(RpcContext, RequestStream<P>, DuplexSink<Q>) + 'static,
{
let (ser, de) = (method.resp_ser(), method.req_de());
let h = Box::new(move |ctx: RpcContext, _: &[u8]| {
execute_duplex_streaming(ctx, ser, de, &handler)
});
self.handlers
.insert(method.name.as_bytes(), Handler::new(MethodType::Duplex, h));
self
}
pub fn build(self) -> Service {
Service {
handlers: self.handlers,
}
}
}
pub struct Service {
handlers: HashMap<&'static [u8], Handler>,
}
pub struct ServerBuilder {
env: Arc<Environment>,
binders: Vec<Binder>,
args: Option<ChannelArgs>,
slots_per_cq: usize,
handlers: HashMap<&'static [u8], Handler>,
}
impl ServerBuilder {
pub fn new(env: Arc<Environment>) -> ServerBuilder {
ServerBuilder {
env: env,
binders: Vec::new(),
args: None,
slots_per_cq: DEFAULT_REQUEST_SLOTS_PER_CQ,
handlers: HashMap::new(),
}
}
pub fn bind<S: Into<String>>(mut self, host: S, port: u16) -> ServerBuilder {
self.binders.push(Binder::new(host.into(), port));
self
}
pub fn channel_args(mut self, args: ChannelArgs) -> ServerBuilder {
self.args = Some(args);
self
}
pub fn requests_slot_per_cq(mut self, slots: usize) -> ServerBuilder {
self.slots_per_cq = slots;
self
}
pub fn register_service(mut self, service: Service) -> ServerBuilder {
self.handlers.extend(service.handlers);
self
}
pub fn build(mut self) -> Result<Server> {
let args = self.args
.as_ref()
.map_or_else(ptr::null, |args| args.as_ptr());
unsafe {
let server = grpc_sys::grpc_server_create(args, ptr::null_mut());
let mut bind_addrs = Vec::with_capacity(self.binders.len());
for mut binder in self.binders.drain(..) {
let bind_port = binder.bind(server);
if bind_port == 0 {
grpc_sys::grpc_server_destroy(server);
return Err(Error::BindFail(binder.host, binder.port));
}
bind_addrs.push((binder.host, bind_port as u16));
}
for cq in self.env.completion_queues() {
let cq_ref = cq.borrow()?;
grpc_sys::grpc_server_register_completion_queue(
server,
cq_ref.as_ptr(),
ptr::null_mut(),
);
}
Ok(Server {
inner: Arc::new(Inner {
env: self.env,
server: server,
shutdown: AtomicBool::new(false),
bind_addrs: bind_addrs,
slots_per_cq: self.slots_per_cq,
handlers: self.handlers,
}),
})
}
}
}
#[cfg(feature = "secure")]
mod secure_server {
use credentials::ServerCredentials;
use super::{Binder, ServerBuilder};
impl ServerBuilder {
pub fn bind_secure<S: Into<String>>(
mut self,
host: S,
port: u16,
c: ServerCredentials,
) -> ServerBuilder {
self.binders.push(Binder::with_cred(host.into(), port, c));
self
}
}
}
pub struct Inner {
env: Arc<Environment>,
server: *mut GrpcServer,
bind_addrs: Vec<(String, u16)>,
slots_per_cq: usize,
shutdown: AtomicBool,
handlers: HashMap<&'static [u8], Handler>,
}
impl Inner {
pub fn get_handler(&self, method: &[u8]) -> Option<&Handler> {
self.handlers.get(method)
}
}
impl Debug for Inner {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(f, "Server {:?}", self.bind_addrs)
}
}
impl Drop for Inner {
fn drop(&mut self) {
unsafe { grpc_sys::grpc_server_destroy(self.server) }
}
}
pub fn request_call(inner: Arc<Inner>, cq: &CompletionQueue) {
if inner.shutdown.load(Ordering::Relaxed) {
return;
}
let cq_ref = match cq.borrow() {
Err(_) => return,
Ok(c) => c,
};
let server_ptr = inner.server;
let prom = CallTag::request(inner);
let request_ptr = prom.request_ctx().unwrap().as_ptr();
let prom_box = Box::new(prom);
let tag = Box::into_raw(prom_box);
let code = unsafe {
grpc_sys::grpcwrap_server_request_call(
server_ptr,
cq_ref.as_ptr(),
request_ptr,
tag as *mut _,
)
};
if code != GrpcCallStatus::Ok {
Box::from(tag);
panic!("failed to request call: {:?}", code);
}
}
pub struct ShutdownFuture {
cq_f: CqFuture<()>,
}
impl Future for ShutdownFuture {
type Item = ();
type Error = Error;
fn poll(&mut self) -> Poll<(), Error> {
try_ready!(self.cq_f.poll());
Ok(Async::Ready(()))
}
}
unsafe impl Sync for Inner {}
unsafe impl Send for Inner {}
pub struct Server {
inner: Arc<Inner>,
}
impl Server {
pub fn shutdown(&mut self) -> ShutdownFuture {
let (cq_f, prom) = CallTag::shutdown_pair();
let prom_box = Box::new(prom);
let tag = Box::into_raw(prom_box);
unsafe {
let cq_ref = self.inner.env.completion_queues()[0].borrow().unwrap();
grpc_sys::grpc_server_shutdown_and_notify(
self.inner.server,
cq_ref.as_ptr(),
tag as *mut _,
)
}
self.inner.shutdown.store(true, Ordering::SeqCst);
ShutdownFuture { cq_f: cq_f }
}
pub fn cancel_all_calls(&mut self) {
unsafe { grpc_sys::grpc_server_cancel_all_calls(self.inner.server) }
}
pub fn start(&mut self) {
unsafe {
grpc_sys::grpc_server_start(self.inner.server);
for cq in self.inner.env.completion_queues() {
for _ in 0..self.inner.slots_per_cq {
request_call(self.inner.clone(), cq);
}
}
}
}
pub fn bind_addrs(&self) -> &[(String, u16)] {
&self.inner.bind_addrs
}
}
impl Drop for Server {
fn drop(&mut self) {
let f = self.shutdown();
self.cancel_all_calls();
let _ = f.wait();
}
}
impl Debug for Server {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
write!(f, "{:?}", self.inner)
}
}