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liblog: Add C++ wrapper for C event log handler 

Add android_log_event_context class.

Test: in context of 'logd: add getEventTag command and service'
Bug: 31456426
Bug: 26552300
Bug: 31289077
Bug: 19235719
Change-Id: Icf918b443f01e04040c8d3efe0cdb7a8e70be10c
This commit is contained in:
Mark Salyzyn 2016-09-27 11:18:29 -07:00
parent e5976bea7a
commit 8eaaac0103
1 changed files with 94 additions and 2 deletions
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96
include/log/logger.h
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@ -15,6 +15,10 @@
#include <time.h> /* clockid_t definition */
#endif
#ifdef __cplusplus
#include <string>
#endif
#include <log/log.h>
#include <log/log_read.h>
@ -81,14 +85,14 @@ struct logger_entry_v4 {
* written to the logger. An attempt to write more than
* this amount will result in a truncated log entry.
*/
#define LOGGER_ENTRY_MAX_PAYLOAD 4068
#define LOGGER_ENTRY_MAX_PAYLOAD 4068
/*
* The maximum size of a log entry which can be read from the
* kernel logger driver. An attempt to read less than this amount
* may result in read() returning EINVAL.
*/
#define LOGGER_ENTRY_MAX_LEN (5*1024)
#define LOGGER_ENTRY_MAX_LEN (5*1024)
#define NS_PER_SEC 1000000000ULL
@ -219,6 +223,94 @@ clockid_t android_log_clockid();
log_id_t android_name_to_log_id(const char *logName);
const char *android_log_id_to_name(log_id_t log_id);
#ifdef __cplusplus
// android_log_context C++ helpers
class android_log_event_context {
android_log_context ctx;
int ret;
public:
explicit android_log_event_context(int tag) : ret(0) {
ctx = create_android_logger(tag);
}
explicit android_log_event_context(log_msg& log_msg) : ret(0) {
ctx = create_android_log_parser(log_msg.msg() + sizeof(uint32_t),
log_msg.entry.len - sizeof(uint32_t));
}
~android_log_event_context() { android_log_destroy(&ctx); }
int close() {
int retval = android_log_destroy(&ctx);
if (retval < 0) ret = retval;
return retval;
}
// To allow above C calls to use this class as parameter
operator android_log_context() const { return ctx; };
int error() const { return ret; }
int begin() {
int retval = android_log_write_list_begin(ctx);
if (retval < 0) ret = retval;
return ret;
}
int end() {
int retval = android_log_write_list_end(ctx);
if (retval < 0) ret = retval;
return ret;
}
android_log_event_context& operator <<(int32_t value) {
int retval = android_log_write_int32(ctx, value);
if (retval < 0) ret = retval;
return *this;
}
android_log_event_context& operator <<(uint32_t value) {
int retval = android_log_write_int32(ctx, value);
if (retval < 0) ret = retval;
return *this;
}
android_log_event_context& operator <<(int64_t value) {
int retval = android_log_write_int64(ctx, value);
if (retval < 0) ret = retval;
return *this;
}
android_log_event_context& operator <<(uint64_t value) {
int retval = android_log_write_int64(ctx, value);
if (retval < 0) ret = retval;
return *this;
}
android_log_event_context& operator <<(const char* value) {
int retval = android_log_write_string8(ctx, value);
if (retval < 0) ret = retval;
return *this;
}
android_log_event_context& operator <<(std::string& value) {
int retval = android_log_write_string8_len(ctx,
value.data(),
value.length());
if (retval < 0) ret = retval;
return *this;
}
android_log_event_context& operator <<(float value) {
int retval = android_log_write_float32(ctx, value);
if (retval < 0) ret = retval;
return *this;
}
int write(log_id_t id) {
int retval = android_log_write_list(ctx, id);
if (retval < 0) ret = retval;
return ret;
}
android_log_list_element read() { return android_log_read_next(ctx); }
android_log_list_element peak() { return android_log_peek_next(ctx); }
};
#endif
#ifdef __cplusplus
}
#endif