first draft of SM21 reader

https://github.com/Goala/abap-log-exporter/issues/41

src/zcl_ale_log_reader_sm21.clas.abap

@@ -16,6 +16,51 @@ ENDCLASS.
 CLASS zcl_ale_log_reader_sm21 IMPLEMENTATION.
   METHOD zif_ale_log_reader~read.
 
+    DATA syslog_filter TYPE REF TO cl_syslog_filter.
+    DATA datetime_from TYPE rslgtime.
+    DATA datetime_to TYPE rslgtime.
+    DATA syslogs_total TYPE rslgentr_new_tab.
+
+    datetime_from = sy-datum + '000000'.
+    datetime_to   = sy-datum + '235959'.
+
+    syslog_filter = NEW #( ).
+
+    syslog_filter->set_filter_datetime(
+       EXPORTING
+         im_datetime_from = datetime_from                  " UTC Time Stamp in Short Form (YYYYMMDDhhmmss)
+         im_datetime_to   = datetime_to                 " UTC Time Stamp in Short Form (YYYYMMDDhhmmss)
+     ).
+
+    DATA(syslog_client) = NEW cl_syslog_sapcontrol_client( ).
+
+    TRY.
+        DATA(servers) = syslog_client->get_server_names( ).
+      CATCH cx_server_list. " Exception in creating a server list.
+        ASSERT 1 = 2.
+    ENDTRY.
+
+    LOOP AT servers ASSIGNING FIELD-SYMBOL(<server>).
+      TRY.
+          DATA(syslogs_server) = syslog_client->read_syslog( iv_hostname = <server>-name ).
+          syslogs_total = VALUE #( BASE syslogs_total ( LINES OF syslogs_server ) ).
+        CATCH cx_ai_system_fault. " Application Integration: Technical Error
+          ASSERT 1 = 2.
+      ENDTRY.
+    ENDLOOP.
+
+
+    LOOP AT syslogs_total ASSIGNING FIELD-SYMBOL(<syslog>).
+
+      logs = VALUE #( BASE logs ( level = '1'
+                                  header_text = <syslog>-slgtype
+                                  item_text = <syslog>-slgdata ) ).
+
+    ENDLOOP.
+
+
+
+
   ENDMETHOD.
 
 ENDCLASS.