[Raspberry pi] 編譯 GRPC

最近在嘗試網路連線部分，想說Google出了一套GRPC的通訊感覺很好用就來用看看~

首先先下載所需要的工具

$ sudo apt-get install build-esstial autoconf libtool
$ sudo apt-get install libgtest-dev clang libc++-dev
$ sudo apt-get install git cmake vim make

接著利用git下載原始碼

$ git clone https://github.com/grpc/grpc.git

因為grpc依賴protobuf，所以要先安裝protobuf

$ cd grpc/third_party

由於git下來的protobuf資料節是空的所以要再將protobuf git下來

grpc/third_party $ git clone https://github.com/google/protobuf.git
grpc/third_party $ cd protobuf

透過執行 autogen.sh 生成 configure 檔

grpc/third_party/protobuf $ ./autogen.sh
grpc/third_party/protobuf $ ./configure
grpc/third_party/protobuf $ make -j4
grpc/third_party/protobuf $ make check
grpc/third_party/protobuf $ sudo make install
grpc/third_party/protobuf $ sudo ldconfig

基本上這樣就安裝好了，但還需要做一些環境設定

$ vim ~/.profile

利用vim打開該文件後，在最下面新增這行

　export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib

並存檔後離開，並執行指令使配置文件修改生效

$ source ~/.profile

查看protobuf版本以測試是否安装成功

$ protoc --version

我裝的版本是libprotoc 3.4.0，所以會顯示
　　libprotoc 3.4.0

接著就來安裝grpc吧！
進入到grpc的資料夾

$ cd grpc
grpc $ git submodule update --init
grpc $ make -j4
grpc $ make check
grpc $ sudo make install
grpc $ sudo ldconfig

這樣就安裝好了喔！
編譯看看範例程式是否安裝成功，make產生測試執行檔

grpc $ cd examples/cpp/helloworld/
grpc/examples/cpp/helloworld/ $ make

執行看看吧，先啟動 server 端

grpc/examples/cpp/helloworld/ $ ./greeter_server

成功執行會看到

　Server listening on 0.0.0.0:50051

接著啟動 client 端

grpc/examples/cpp/helloworld/ $ ./greeter_client

看到

　Greeter received: Hello world

恭喜你，成功囉~

在編譯grpc的過程中我遇到兩個錯誤

問題1. gRPC不再使用OpenSSL構建 - 僅在Debian下

這是我出現錯誤時螢幕上所顯示的 error

src/core/tsi/ssl_transport_security.c: In function ‘tsi_create_ssl_client_handshaker_factory’:
src/core/tsi/ssl_transport_security.c:1356:3: error: ‘TLSv1_2_method’ is deprecated [-Werror=deprecated-declarations]
   ssl_context = SSL_CTX_new(TLSv1_2_method());
   ^~~~~~~~~~~
In file included from /usr/include/openssl/ct.h:13:0,
                 from /usr/include/openssl/ssl.h:61,
                 from src/core/tsi/ssl_transport_security.c:45:
/usr/include/openssl/ssl.h:1624:1: note: declared here
 DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_2_method(void)) /* TLSv1.2 */
 ^
src/core/tsi/ssl_transport_security.c: In function ‘tsi_create_ssl_server_handshaker_factory_ex’:
src/core/tsi/ssl_transport_security.c:1473:7: error: ‘TLSv1_2_method’ is deprecated [-Werror=deprecated-declarations]
       impl->ssl_contexts[i] = SSL_CTX_new(TLSv1_2_method());
       ^~~~
In file included from /usr/include/openssl/ct.h:13:0,
                 from /usr/include/openssl/ssl.h:61,
                 from src/core/tsi/ssl_transport_security.c:45:
/usr/include/openssl/ssl.h:1624:1: note: declared here
 DEPRECATEDIN_1_1_0(__owur const SSL_METHOD *TLSv1_2_method(void)) /* TLSv1.2 */
 ^
At top level:
src/core/tsi/ssl_transport_security.c:126:22: error: ‘openssl_thread_id_cb’ defined but not used [-Werror=unused-function]
 static unsigned long openssl_thread_id_cb(void) {
                      ^~~~~~~~~~~~~~~~~~~~
src/core/tsi/ssl_transport_security.c:118:13: error: ‘openssl_locking_cb’ defined but not used [-Werror=unused-function]
 static void openssl_locking_cb(int mode, int type, const char *file, int line) {
             ^~~~~~~~~~~~~~~~~~
[C]       Compiling src/core/ext/transport/chttp2/server/chttp2_server.c
[C]       Compiling src/core/ext/transport/chttp2/client/secure/secure_channel_create.c
[C]       Compiling src/core/ext/filters/client_channel/channel_connectivity.c
[C]       Compiling src/core/ext/filters/client_channel/client_channel.c
[C]       Compiling src/core/ext/filters/client_channel/client_channel_factory.c
[C]       Compiling src/core/ext/filters/client_channel/client_channel_plugin.c
[C]       Compiling src/core/ext/filters/client_channel/connector.c
[C]       Compiling src/core/ext/filters/client_channel/http_connect_handshaker.c
cc1: all warnings being treated as errors
[C]       Compiling src/core/ext/filters/client_channel/http_proxy.c
Makefile:2564: recipe for target '/home/pi/Downloads/grpc/objs/opt/src/core/tsi/ssl_transport_security.o' failed
make: *** [/home/pi/Downloads/grpc/objs/opt/src/core/tsi/ssl_transport_security.o] Error 1
make: *** Waiting for unfinished jobs....

會造成這個問題是這個版本的Debian隨OpenSSL 1.1一起發行，這個API已經發生了重大的變化。
請參閱 https://wiki.openssl.org/index.php/OpenSSL_1.1.0_Changes#Downloads

處理方法：

$ sudo apt-get remove libssl1.1
$ sudo apt-get instal libssl1.0

之後再執行

grpc $ make clean
grpc $ make -j4

就會順利完成了喔！

問題2. libprotobuf

這是我出現的 error

//usrusr/usr/bin/ld: warning: libprotobuf.so.14, /needed by //usr/bin/ldlocal/lib/libprotoc.so, :may  warning: /bin/ld: warning: libprotobuf.so.14, needed by //usr/local/lib/libprotoc.so,libprotobuf.so.14 may conflict with , conflict with libprotobuf.so.10
/usr/bin/ld: warning: libprotobuf.so.14, needed by //usr/local/lib/libprotoc.so, may conflict with libprotobuf.so.10
/usr/bin/ld: /home/pi/Downloads/grpc/libs/opt/libgrpc_plugin_support.a(objective_c_generator.o): undefined reference to symbol '_ZNK6google8protobuf16MethodDescriptor11output_typeEv'
/usr/local/lib/libprotobuf.so.14: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
Makefile:15381: recipe for target '/home/pi/Downloads/grpc/bins/opt/grpc_objective_c_plugin' failed
make: *** [/home/pi/Downloads/grpc/bins/opt/grpc_objective_c_plugin] Error 1
make: *** Waiting for unfinished jobs....
libprotobuf.so.10
/usr/bin/ld: warning: libprotobuf.so.14, needed by /needed/usr/local/lib/libprotoc.so, may conflict with  by /libprotobuf.so.10/usr
/usr/bin//ld: /localhome/pi//Downloads/grpc/libs/opt/libgrpc_plugin_support.a(csharp_generator.o): undefined reference to symbol '_ZNK6google8protobuf16MethodDescriptor11output_typeEv'
/usr/local/liblib/libprotobuf.so.14: error adding symbols/:libprotoc.so DSO missing from command,  line
may conflict with libprotobuf.so.10
/usr/bin/ld: collect2: error: ld returned 1 exit status
warning: libprotobuf.so.14, needed by //usr/local/lib/libprotoc.so, may conflict with libprotobuf.so.10
/usr/bin/ld: /home/pi/Downloads/grpc/libs/opt/libgrpc_plugin_support.a(node_generator.o): undefined reference to symbol '_ZNK6google8protobuf16MethodDescriptor11output_typeEv'
/usr/Makefile:15319: recipe for target '/home/pi/Downloads/grpc/bins/opt/grpc_csharp_plugin' failed
local/make: *** [/home/pi/Downloads/grpc/bins/opt/grpc_csharp_plugin] Error 1
lib/libprotobuf.so.14: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
Makefile:15350: recipe for target '/home/pi/Downloads/grpc/bins/opt/grpc_node_plugin' failed
make: *** [/home/pi/Downloads/grpc/bins/opt/grpc_node_plugin] Error 1

發生這種情況是因為Makefile在構建插件時使用系統libprotobuf庫，而不是使用/ usr / local / lib中安裝的protobuf庫。

處理方法：

grpc $ vim Makefile
$ sudo apt-get instal libssl1.0

找到 HOST_LDLIBS_PROTOC += $(addprefix -l, $(LIBS_PROTOC))
將他修改成 HOST_LDLIBS_PROTOC += -L/usr/local/lib $(addprefix -l, $(LIBS_PROTOC))
存檔後離開，之後再執行

grpc $ make clean
grpc $ make -j4

參考資料：
　https://grpc.io/docs/quickstart/cpp.html#build-the-example
　http://blog.csdn.net/guoyilongedu/article/details/17093811
　https://github.com/grpc/grpc/issues/10589
　https://github.com/grpc/grpc/issues/9549

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