prototypes for native logging

1 files changed, 32 insertions, 0 deletions

diff --git a/taler_wallet_core_lib.h b/taler_wallet_core_lib.h
index ad7d801..fad3c98 100644
--- a/taler_wallet_core_lib.h
+++ b/taler_wallet_core_lib.h
@@ -38,6 +38,13 @@ struct TALER_WALLET_Instance;
  */
 typedef void (*TALER_WALLET_MessageHandlerFn)(void *handler_p, const char *message);
 
+enum TALER_WALLET_LogLevel {
+  TALER_WALLET_LOG_TRACE = 1,
+  TALER_WALLET_LOG_INFO = 2,
+  TALER_WALLET_LOG_WARN = 3,
+  TALER_WALLET_LOG_ERROR = 4
+};
+
 /**
  * Create a new wallet-core instance..
  */
@@ -55,6 +62,31 @@ TALER_WALLET_set_message_handler(struct TALER_WALLET_Instance *twi,
                                  TALER_WALLET_MessageHandlerFn handler_f,
                                  void *handler_p);
 
+/**
+ * Handler for log message from wallet-core.
+ *
+ * @param log_p opaque closure for the log handler
+ * @param level log level of the log message
+ * @param tag log tag (usually the file from which the message gets logged)
+ * @param msg the log message
+ */
+typedef void (*TALER_WALLET_LogHandlerFn)(void *log_p,
+                                          enum TALER_WALLET_LogLevel level,
+                                          const char *tag,
+                                          const char *msg);
+
+
+/**
+ * Set a handler for log messages from wallet-core.
+ * Must be called before the wallet runs.
+ *
+ * Caution: The log message handler will be called from a different thread.
+ */
+void
+TALER_WALLET_set_log_handler(struct TALER_WALLET_Instance *twi,
+                             TALER_WALLET_LogHandlerFn *handler_f,
+                             void *handler_p);
+
 
 /**
  * Set/override the JS file with the wallet-core implementation.