io.grpc.netty.NettyServerBuilder Maven / Gradle / Ivy
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package io.grpc.netty;
import static com.google.common.base.Preconditions.checkArgument;
import static io.grpc.internal.GrpcUtil.DEFAULT_MAX_MESSAGE_SIZE;
import com.google.common.base.Preconditions;
import io.grpc.ExperimentalApi;
import io.grpc.Internal;
import io.grpc.internal.AbstractServerImplBuilder;
import io.grpc.internal.GrpcUtil;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.ServerChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.ssl.SslContext;
import java.io.File;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import javax.annotation.Nullable;
import javax.net.ssl.SSLException;
/**
* A builder to help simplify the construction of a Netty-based GRPC server.
*/
@ExperimentalApi("https://github.com/grpc/grpc-java/issues/1784")
public final class NettyServerBuilder extends AbstractServerImplBuilder {
public static final int DEFAULT_FLOW_CONTROL_WINDOW = 1048576; // 1MiB
private final SocketAddress address;
private Class channelType = NioServerSocketChannel.class;
@Nullable
private EventLoopGroup bossEventLoopGroup;
@Nullable
private EventLoopGroup workerEventLoopGroup;
private SslContext sslContext;
private ProtocolNegotiator protocolNegotiator;
private int maxConcurrentCallsPerConnection = Integer.MAX_VALUE;
private int flowControlWindow = DEFAULT_FLOW_CONTROL_WINDOW;
private int maxMessageSize = DEFAULT_MAX_MESSAGE_SIZE;
private int maxHeaderListSize = GrpcUtil.DEFAULT_MAX_HEADER_LIST_SIZE;
/**
* Creates a server builder that will bind to the given port.
*
* @param port the port on which the server is to be bound.
* @return the server builder.
*/
public static NettyServerBuilder forPort(int port) {
return new NettyServerBuilder(port);
}
/**
* Creates a server builder configured with the given {@link SocketAddress}.
*
* @param address the socket address on which the server is to be bound.
* @return the server builder
*/
public static NettyServerBuilder forAddress(SocketAddress address) {
return new NettyServerBuilder(address);
}
private NettyServerBuilder(int port) {
this.address = new InetSocketAddress(port);
}
private NettyServerBuilder(SocketAddress address) {
this.address = address;
}
/**
* Specify the channel type to use, by default we use {@link NioServerSocketChannel}.
*/
public NettyServerBuilder channelType(Class channelType) {
this.channelType = Preconditions.checkNotNull(channelType);
return this;
}
/**
* Provides the boss EventGroupLoop to the server.
*
* It's an optional parameter. If the user has not provided one when the server is built, the
* builder will use the default one which is static.
*
*
The server won't take ownership of the given EventLoopGroup. It's caller's responsibility
* to shut it down when it's desired.
*
*
Grpc uses non-daemon {@link Thread}s by default and thus a {@link io.grpc.Server} will
* continue to run even after the main thread has terminated. However, users have to be cautious
* when providing their own {@link EventLoopGroup}s.
* For example, Netty's {@link EventLoopGroup}s use daemon threads by default
* and thus an application with only daemon threads running besides the main thread will exit as
* soon as the main thread completes.
* A simple solution to this problem is to call {@link io.grpc.Server#awaitTermination()} to
* keep the main thread alive until the server has terminated.
*/
public NettyServerBuilder bossEventLoopGroup(EventLoopGroup group) {
this.bossEventLoopGroup = group;
return this;
}
/**
* Provides the worker EventGroupLoop to the server.
*
*
It's an optional parameter. If the user has not provided one when the server is built, the
* builder will create one.
*
*
The server won't take ownership of the given EventLoopGroup. It's caller's responsibility
* to shut it down when it's desired.
*
*
Grpc uses non-daemon {@link Thread}s by default and thus a {@link io.grpc.Server} will
* continue to run even after the main thread has terminated. However, users have to be cautious
* when providing their own {@link EventLoopGroup}s.
* For example, Netty's {@link EventLoopGroup}s use daemon threads by default
* and thus an application with only daemon threads running besides the main thread will exit as
* soon as the main thread completes.
* A simple solution to this problem is to call {@link io.grpc.Server#awaitTermination()} to
* keep the main thread alive until the server has terminated.
*/
public NettyServerBuilder workerEventLoopGroup(EventLoopGroup group) {
this.workerEventLoopGroup = group;
return this;
}
/**
* Sets the TLS context to use for encryption. Providing a context enables encryption. It must
* have been configured with {@link GrpcSslContexts}, but options could have been overridden.
*/
public NettyServerBuilder sslContext(SslContext sslContext) {
if (sslContext != null) {
checkArgument(sslContext.isServer(),
"Client SSL context can not be used for server");
GrpcSslContexts.ensureAlpnAndH2Enabled(sslContext.applicationProtocolNegotiator());
}
this.sslContext = sslContext;
return this;
}
/**
* Sets the {@link ProtocolNegotiator} to be used. If non-{@code null}, overrides the value
* specified in {@link #sslContext(SslContext)}.
*
*
Default: {@code null}.
*/
@Internal
public final NettyServerBuilder protocolNegotiator(
@Nullable ProtocolNegotiator protocolNegotiator) {
this.protocolNegotiator = protocolNegotiator;
return this;
}
/**
* The maximum number of concurrent calls permitted for each incoming connection. Defaults to no
* limit.
*/
public NettyServerBuilder maxConcurrentCallsPerConnection(int maxCalls) {
checkArgument(maxCalls > 0, "max must be positive: %s", maxCalls);
this.maxConcurrentCallsPerConnection = maxCalls;
return this;
}
/**
* Sets the HTTP/2 flow control window. If not called, the default value
* is {@link #DEFAULT_FLOW_CONTROL_WINDOW}).
*/
public NettyServerBuilder flowControlWindow(int flowControlWindow) {
checkArgument(flowControlWindow > 0, "flowControlWindow must be positive");
this.flowControlWindow = flowControlWindow;
return this;
}
/**
* Sets the maximum message size allowed to be received on the server. If not called,
* defaults to 4 MiB. The default provides protection to services who haven't considered the
* possibility of receiving large messages while trying to be large enough to not be hit in normal
* usage.
*/
public NettyServerBuilder maxMessageSize(int maxMessageSize) {
checkArgument(maxMessageSize >= 0, "maxMessageSize must be >= 0");
this.maxMessageSize = maxMessageSize;
return this;
}
/**
* Sets the maximum size of header list allowed to be received on the server. If not called,
* defaults to {@link GrpcUtil#DEFAULT_MAX_HEADER_LIST_SIZE}.
*/
public NettyServerBuilder maxHeaderListSize(int maxHeaderListSize) {
checkArgument(maxHeaderListSize > 0, "maxHeaderListSize must be > 0");
this.maxHeaderListSize = maxHeaderListSize;
return this;
}
@Override
protected NettyServer buildTransportServer() {
ProtocolNegotiator negotiator = protocolNegotiator;
if (negotiator == null) {
negotiator = sslContext != null ? ProtocolNegotiators.serverTls(sslContext) :
ProtocolNegotiators.serverPlaintext();
}
return new NettyServer(address, channelType, bossEventLoopGroup, workerEventLoopGroup,
negotiator, maxConcurrentCallsPerConnection, flowControlWindow, maxMessageSize,
maxHeaderListSize);
}
@Override
public NettyServerBuilder useTransportSecurity(File certChain, File privateKey) {
try {
sslContext = GrpcSslContexts.forServer(certChain, privateKey).build();
} catch (SSLException e) {
// This should likely be some other, easier to catch exception.
throw new RuntimeException(e);
}
return this;
}
}