Merge pull request #1669 from eyedeekay/c-wrapper-libi2pd-api

C wrapper for part of the libi2pd api

Makefile

@@ -1,25 +1,28 @@
 SYS := $(shell $(CXX) -dumpmachine)
 SHLIB := libi2pd.so
 ARLIB := libi2pd.a
-SHLIB_CLIENT := libi2pdclient.so
-ARLIB_CLIENT := libi2pdclient.a
 SHLIB_LANG := libi2pdlang.so
 ARLIB_LANG := libi2pdlang.a
+SHLIB_CLIENT := libi2pdclient.so
+ARLIB_CLIENT := libi2pdclient.a
+SHLIB_WRAP := libi2pdwrapper.so
+ARLIB_WRAP := libi2pdwrapper.a
 I2PD := i2pd
 
 LIB_SRC_DIR := libi2pd
 LIB_CLIENT_SRC_DIR := libi2pd_client
+WRAP_SRC_DIR := libi2pd_wrapper
 LANG_SRC_DIR := i18n
 DAEMON_SRC_DIR := daemon
 
 # import source files lists
 include filelist.mk
 
-USE_AESNI	:= yes
-USE_STATIC	:= no
-USE_MESHNET	:= no
-USE_UPNP	:= no
-DEBUG		:= yes
+USE_AESNI	:= $(or $(USE_AESNI),yes)
+USE_STATIC	:= $(or $(USE_STATIC),no)
+USE_MESHNET	:= $(or $(USE_MESHNET),no)
+USE_UPNP	:= $(or $(USE_UPNP),no)
+DEBUG		:= $(or $(DEBUG),yes)
 
 ifeq ($(DEBUG),yes)
 	CXX_DEBUG = -g
@@ -56,6 +59,7 @@ NEEDED_CXXFLAGS += -MMD -MP -I$(LIB_SRC_DIR) -I$(LIB_CLIENT_SRC_DIR) -I$(LANG_SR
 
 LIB_OBJS        += $(patsubst %.cpp,obj/%.o,$(LIB_SRC))
 LIB_CLIENT_OBJS += $(patsubst %.cpp,obj/%.o,$(LIB_CLIENT_SRC))
+WRAP_LIB_OBJS   += $(patsubst %.cpp,obj/%.o,$(WRAP_LIB_SRC))
 LANG_OBJS       += $(patsubst %.cpp,obj/%.o,$(LANG_SRC))
 DAEMON_OBJS     += $(patsubst %.cpp,obj/%.o,$(DAEMON_SRC))
 DEPS            += $(LIB_OBJS:.o=.d) $(LIB_CLIENT_OBJS:.o=.d) $(LANG_OBJS:.o=.d) $(DAEMON_OBJS:.o=.d)
@@ -68,13 +72,16 @@ mk_obj_dir:
 	@mkdir -p obj/$(LIB_SRC_DIR)
 	@mkdir -p obj/$(LIB_CLIENT_SRC_DIR)
 	@mkdir -p obj/$(LANG_SRC_DIR)
+	@mkdir -p obj/$(WRAP_SRC_DIR)
 	@mkdir -p obj/$(DAEMON_SRC_DIR)
 
 api: mk_obj_dir $(SHLIB) $(ARLIB)
 client: mk_obj_dir $(SHLIB_CLIENT) $(ARLIB_CLIENT)
 api_client: mk_obj_dir $(SHLIB) $(ARLIB) $(SHLIB_CLIENT) $(ARLIB_CLIENT)
+wrapper: api_client $(SHLIB_WRAP) $(ARLIB_WRAP)
 lang: mk_obj_dir $(SHLIB_LANG) $(ARLIB_LANG)
 
+
 ## NOTE: The NEEDED_CXXFLAGS are here so that CXXFLAGS can be specified at build time
 ## **without** overwriting the CXXFLAGS which we need in order to build.
 ## For example, when adding 'hardening flags' to the build
@@ -101,6 +108,11 @@ ifneq ($(USE_STATIC),yes)
 	$(CXX) $(LDFLAGS) -shared -o $@ $^ $(LDLIBS) $(SHLIB)
 endif
 
+$(SHLIB_WRAP): $(WRAP_LIB_OBJS)
+ifneq ($(USE_STATIC),yes)
+	$(CXX) $(LDFLAGS) -shared -o $@ $^ $(LDLIBS)
+endif
+
 $(SHLIB_LANG): $(LANG_OBJS)
 ifneq ($(USE_STATIC),yes)
 	$(CXX) $(LDFLAGS) -shared -o $@ $^ $(LDLIBS)
@@ -112,6 +124,9 @@ $(ARLIB): $(LIB_OBJS)
 $(ARLIB_CLIENT): $(LIB_CLIENT_OBJS)
 	$(AR) -r $@ $^
 
+$(ARLIB_WRAP): $(WRAP_LIB_OBJS)
+	$(AR) -r $@ $^
+
 $(ARLIB_LANG): $(LANG_OBJS)
 	$(AR) -r $@ $^
 

filelist.mk

@@ -21,4 +21,6 @@ LIB_CLIENT_SRC = $(wildcard $(LIB_CLIENT_SRC_DIR)/*.cpp)
 
 LANG_SRC = $(wildcard $(LANG_SRC_DIR)/*.cpp)
 
+WRAP_LIB_SRC = $(wildcard $(WRAP_SRC_DIR)/*.cpp)
+
 DAEMON_SRC = $(wildcard $(DAEMON_SRC_DIR)/*.cpp)

libi2pd_wrapper/api.go

@@ -0,0 +1,15 @@
+package api
+
+/*
+* Copyright (c) 2013-2020, The PurpleI2P Project
+*
+* This file is part of Purple i2pd project and licensed under BSD3
+*
+* See full license text in LICENSE file at top of project tree
+*/
+
+/*
+#cgo CXXFLAGS: -I${SRCDIR}/../i18n -I${SRCDIR}/../libi2pd_client -I${SRCDIR}/../libi2pd -g -Wall -Wextra -Wno-unused-parameter -pedantic -Wno-psabi -fPIC -D__AES__ -maes
+#cgo LDFLAGS: -L${SRCDIR}/../ -l:libi2pd.a -l:libi2pdlang.a -latomic -lcrypto -lssl -lz -lboost_system -lboost_date_time -lboost_filesystem -lboost_program_options -lpthread -lstdc++
+*/
+import "C"

libi2pd_wrapper/api.swigcxx

@@ -0,0 +1,8 @@
+// See swig.org for more inteface options,
+// e.g. map std::string to Go string
+
+%{
+#include "capi.h"
+%}
+
+%include "capi.h"

libi2pd_wrapper/capi.cpp

@@ -0,0 +1,106 @@
+/*
+* Copyright (c) 2013-2020, The PurpleI2P Project
+*
+* This file is part of Purple i2pd project and licensed under BSD3
+*
+* See full license text in LICENSE file at top of project tree
+*/
+
+#include "api.h"
+#include "capi.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+
+// Uses the example from: https://stackoverflow.com/a/9210560
+// See also https://stackoverflow.com/questions/9210528/split-string-with-delimiters-in-c/9210560#
+// Does not handle consecutive delimiters, this is only for passing
+// lists of arguments by value to InitI2P from C_InitI2P
+char** str_split(char* a_str, const char a_delim)
+{
+    char** result    = 0;
+    size_t count     = 0;
+    char* tmp        = a_str;
+    char* last_comma = 0;
+    char delim[2];
+    delim[0] = a_delim;
+    delim[1] = 0;
+
+    /* Count how many elements will be extracted. */
+    while (*tmp)
+    {
+        if (a_delim == *tmp)
+        {
+            count++;
+            last_comma = tmp;
+        }
+        tmp++;
+    }
+
+    /* Add space for trailing token. */
+    count += last_comma < (a_str + strlen(a_str) - 1);
+
+    /* Add space for terminating null string so caller
+       knows where the list of returned strings ends. */
+    count++;
+
+    result = (char**) malloc(sizeof(char*) * count);
+
+    if (result)
+    {
+        size_t idx  = 0;
+        char* token = strtok(a_str, delim);
+
+        while (token)
+        {
+            assert(idx < count);
+            *(result + idx++) = strdup(token);
+            token = strtok(0, delim);
+        }
+        assert(idx == count - 1);
+        *(result + idx) = 0;
+    }
+
+    return result;
+}
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void C_InitI2P (int argc, char argv[], const char * appName)
+{
+	const char* delim = " ";
+	char* vargs = strdup(argv);
+	char** args = str_split(vargs, *delim);
+	std::cout << argv;
+	return i2p::api::InitI2P(argc, args, appName);
+}
+
+void C_TerminateI2P ()
+{
+	return i2p::api::TerminateI2P();
+}
+
+void C_StartI2P ()
+{
+	std::shared_ptr<std::ostream> logStream;
+	return i2p::api::StartI2P(logStream);
+}
+
+void C_StopI2P ()
+{
+	return i2p::api::StopI2P();
+}
+
+void C_RunPeerTest ()
+{
+	return i2p::api::RunPeerTest();
+}
+
+#ifdef __cplusplus
+}
+#endif

libi2pd_wrapper/capi.h

@@ -0,0 +1,29 @@
+/*
+* Copyright (c) 2013-2020, The PurpleI2P Project
+*
+* This file is part of Purple i2pd project and licensed under BSD3
+*
+* See full license text in LICENSE file at top of project tree
+*/
+
+#ifndef CAPI_H__
+#define CAPI_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// initialization start and stop
+void C_InitI2P (int argc, char argv[], const char * appName);
+//void C_InitI2P (int argc, char** argv, const char * appName);
+void C_TerminateI2P ();
+void C_StartI2P ();
+// write system log to logStream, if not specified to <appName>.log in application's folder
+void C_StopI2P ();
+void C_RunPeerTest (); // should be called after UPnP
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif