status-go/signal/signals.c

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#if defined(IOS_DEPLOYMENT)
// ======================================================================================
// iOS framework compilation using xgo
// ======================================================================================
#include <stddef.h>
#include <stdbool.h>
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#include <stdlib.h>
#include <objc/objc.h>
#include <objc/runtime.h>
#include <objc/message.h>
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static id statusServiceClassRef = nil;
static SEL statusServiceSelector = nil;
static bool initLibrary() {
if (statusServiceClassRef == nil) {
statusServiceClassRef = objc_getClass("Status");
if (statusServiceClassRef == nil) return false;
}
if (statusServiceSelector == nil) {
statusServiceSelector = sel_getUid("signalEvent:");
if (statusServiceSelector == nil) return false;
}
return true;
}
/*!
* @brief Calls static method signalEvent of class GethService.
*
* @param jsonEvent - UTF8 string
*
* @note Definition of signalEvent method.
* + (void)signalEvent:(const char *)json
*/
bool StatusServiceSignalEvent(const char *jsonEvent) {
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if (!initLibrary()) return false;
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void (*action)(id, SEL, const char *) = (void (*)(id, SEL, const char *)) objc_msgSend;
action(statusServiceClassRef, statusServiceSelector, jsonEvent);
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return true;
}
#elif defined(ANDROID_DEPLOYMENT)
// ======================================================================================
// Android archive compilation using xgo
// ======================================================================================
#include <stddef.h>
#include <stdbool.h>
#include <jni.h>
bool StatusServiceSignalEvent(const char *jsonEvent);
static JavaVM *gJavaVM = NULL;
static jclass JavaClassPtr_StatusService = NULL;
static jmethodID JavaMethodPtr_signalEvent = NULL;
static bool JniLibraryInit(JNIEnv *env);
/*!
* @brief Get interface to JNI.
*
* @return true if thread should be detached from JNI.
*/
static bool JniAttach(JNIEnv **env) {
jint status;
if (gJavaVM == NULL) {
env = NULL;
}
status = (*gJavaVM)->GetEnv(gJavaVM, (void **)env, JNI_VERSION_1_6);
if (status == JNI_EDETACHED) {
// attach thread to JNI
//(*gJavaVM)->AttachCurrentThread( gJavaVM, (void **)env, NULL ); // Oracle JNI API
(*gJavaVM)->AttachCurrentThread(gJavaVM, env, NULL); // Android JNI API
return true;
} else if (status != JNI_OK) {
return false;
}
return false;
}
/*!
* @brief The VM calls JNI_OnLoad when the native library is loaded.
*/
JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
bool detach;
JNIEnv *env;
int result = JNI_VERSION_1_6;
gJavaVM = vm;
// attach thread to JNI
detach = JniAttach(&env);
if (env == NULL) {
// failed
gJavaVM = NULL;
return 0;
}
if (!JniLibraryInit(env)) {
// fail loading of JNI library
result = 0;
}
if (detach) {
// detach thread from JNI
(*gJavaVM)->DetachCurrentThread(gJavaVM);
}
if (result != JNI_VERSION_1_6) {
gJavaVM = NULL;
}
return result;
}
/*!
* @brief Initialize library.
*/
bool JniLibraryInit(JNIEnv *env) {
int i;
JavaClassPtr_StatusService = (*env)->FindClass(env, "im/status/ethereum/module/StatusService");
if (JavaClassPtr_StatusService == NULL) return false;
JavaClassPtr_StatusService = (jclass)(*env)->NewGlobalRef(env, JavaClassPtr_StatusService);
if (JavaClassPtr_StatusService == NULL) return false;
struct {
bool bStatic;
jclass classPtr;
jmethodID *methodPtr;
const char *methodId;
const char *params;
} javaMethodDescriptors[] = {
{
true,
JavaClassPtr_StatusService,
&JavaMethodPtr_signalEvent, // &JavaMethodPtr_someNonStaticMethod
"signalEvent", // someNonStaticMethod
"(Ljava/lang/String;)V"
},
};
for (i = 0; i < sizeof(javaMethodDescriptors) / sizeof(javaMethodDescriptors[0]); i++) {
if (javaMethodDescriptors[i].bStatic) {
*(javaMethodDescriptors[i].methodPtr) = (*env)->GetStaticMethodID(
env, javaMethodDescriptors[i].classPtr, javaMethodDescriptors[i].methodId, javaMethodDescriptors[i].params);
} else {
*(javaMethodDescriptors[i].methodPtr) = (*env)->GetMethodID(
env, javaMethodDescriptors[i].classPtr, javaMethodDescriptors[i].methodId, javaMethodDescriptors[i].params);
}
if (*(javaMethodDescriptors[i].methodPtr) == NULL) return false;
}
return true;
}
/*!
* @brief Calls static method signalEvent of class im.status.ethereum.module.StatusService.
*
* @param jsonEvent - UTF8 string
*/
bool StatusServiceSignalEvent(const char *jsonEvent) {
bool detach;
JNIEnv *env;
// attach thread to JNI
detach = JniAttach( &env );
if (env == NULL) { // failed
return false;
}
jstring javaJsonEvent = NULL;
if (jsonEvent != NULL) {
javaJsonEvent = (*env)->NewStringUTF(env, jsonEvent);
}
(*env)->CallStaticVoidMethod(env, JavaClassPtr_StatusService, JavaMethodPtr_signalEvent, javaJsonEvent);
if (javaJsonEvent != NULL) (*env)->DeleteLocalRef(env, javaJsonEvent);
if (detach) { // detach thread from JNI
(*gJavaVM)->DetachCurrentThread(gJavaVM);
}
return true;
}
#else
// ======================================================================================
// cgo compilation (for local tests)
// ======================================================================================
#include <stdio.h>
#include <stddef.h>
#include <stdbool.h>
#include "_cgo_export.h"
bool StatusServiceSignalEvent(const char *jsonEvent) {
NotifyNode((char *)jsonEvent); // re-send notification back to status node
return true;
}
#endif