ENH: Add basic exception handling

jlcaosdb/jlcaosdb.cxx

@@ -20,6 +20,8 @@
  * <https://www.gnu.org/licenses/>.
  *
  */
+#include <string>
+
 #include <jlcxx/jlcxx.hpp>
 
 #include "caosdb/authentication.h"
@@ -33,4 +35,12 @@ JLCXX_MODULE define_julia_module(jlcxx::Module& mod)
   mod.method("get_libcaosdb_version_major", []() {return caosdb::LIBCAOSDB_VERSION_MAJOR;});
   mod.method("get_libcaosdb_version_minor", []() {return caosdb::LIBCAOSDB_VERSION_MINOR;});
   mod.method("get_libcaosdb_version_patch", []() {return caosdb::LIBCAOSDB_VERSION_PATCH;});
+
+  // exceptions inherit from abstract Julia exception types:
+  mod.add_type<caosdb::exceptions::AuthenticationError>("AuthenticationError", jlcxx::julia_type("AbstractAuthenticationError"))
+    .constructor<const std::string&>()
+    .method("what", &caosdb::exceptions::AuthenticationError::what);
+  mod.add_type<caosdb::exceptions::ConnectionError>("ConnectionError", jlcxx::julia_type("AbstractConnectionError"))
+    .constructor<const std::string&>()
+    .method("what", &caosdb::exceptions::ConnectionError::what);
 }

src/CaosDB.jl

@@ -5,6 +5,15 @@ module CaosDB
 
 using CxxWrap
 
+"Generic super type of CaosDB exceptions"
+abstract type AbstractCaosDBException <: Exception end
+
+"An error occurred while trying to authenticate"
+abstract type AbstractAuthenticationError <: AbstractCaosDBException end
+
+"Connection couldn't be established"
+abstract type AbstractConnectionError <: AbstractCaosDBException end
+
 # Adapt this path if you haven't compiled jlcaosdb to `caosdb-julialib/build`
 @wrapmodule(joinpath(@__DIR__, "../jlcaosdb/build/lib/libjlcaosdb"))
 
@@ -26,4 +35,8 @@ function get_libcaosdb_version()
     return "$major.$minor.$patch"
 end
 
+# Override the exception printing
+Base.showerror(io::IO, e::AuthenticationError) = print(io, what(e))
+Base.showerror(io::IO, e::ConnectionError) = print(io, what(e))
+
 end # module