X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=components%2Fhmysql%2FhSqlite3.ml;h=b8687c5e9e20e85ce89a3f8a96c06e0508007519;hb=7059335177e9351146e870452e7e6e8ebca8c8c3;hp=20e49451119fee9a5fca94f0db39a8f938124c47;hpb=748a6a2ba28c43e128759efbcc04919420e38cc1;p=helm.git

diff --git a/components/hmysql/hSqlite3.ml b/components/hmysql/hSqlite3.ml
index 20e494511..b8687c5e9 100644
--- a/components/hmysql/hSqlite3.ml
+++ b/components/hmysql/hSqlite3.ml
@@ -29,6 +29,12 @@
 type result = Mysql.result option
 *)
 
+
+let debug = false
+let debug_print = 
+  if debug then prerr_endline else (fun _ ->())
+;;
+
 type result = Sqlite3.row list
 type dbd = Sqlite3.db option
 
@@ -43,41 +49,65 @@ type error_code =
 
 exception Error of string
 
-let prerr_endline s = ()(*HLog.debug s;;*)
-
 let profiler = HExtlib.profile "Sqlite3"
 
-let quick_connect ?host ?(database = "sqlite") ?port ?password ?user () = 
+let quick_connect 
+  is_library
+  ?(host = Helm_registry.get "matita.basedir") 
+  ?(database = "sqlite") ?port ?password ?user () 
+= 
   let username = Helm_registry.get "user.name" in
-  let tmp_db_name =
-    if HExtlib.is_dir "/dev/shm/" && HExtlib.writable_dir "/dev/shm/" then
-      ((*HLog.debug "using /dev/shm to store the working copy of the db";*)
-      "/dev/shm/matita.db." ^ username ^ "." ^ string_of_int (Unix.getpid ()))
-    else
-      ((*HLog.debug "/dev/shm not available";*)
-      Helm_registry.get "matita.basedir" ^ "/matita.db." ^ username ^ "." ^
-        string_of_int (Unix.getpid ()))
+  let host_mangled = Pcre.replace ~pat:"[/ .]" ~templ:"_" host in
+  let find_db _ = 
+    let base = "matita.db." ^ username ^ "." ^ host_mangled ^ "." in
+    let root = "/dev/shm/" in
+    let files = HExtlib.find ~test:(Pcre.pmatch ~pat:(base^"[0-9]+")) root in
+    let rec aux = function
+      | [] -> 
+         debug_print ("HSqlite3: no valid db files found in memory");
+         let name = root ^ base ^ string_of_int (Unix.getpid ()) in
+         debug_print ("HSqlite3: memory db file name: "^name);
+         name, true
+      | x::tl -> 
+         debug_print ("HSqlite3: found a .db in memory: " ^ x);
+         match Array.to_list (Pcre.extract ~pat:"\\.([0-9]+)$" x) with
+         | [] | _::_::_::_ -> assert false
+         | [_;p] when HExtlib.is_dir ("/proc/" ^ p) -> 
+            debug_print ("HSqlite3: found valid db file: " ^ x);
+            x, false
+         | _ ->
+            HLog.warn ("HSqlite3: dead process db file found: " ^ x);
+            HLog.warn ("HSqlite3: removing: " ^ x);
+            ignore (Sys.command ("rm " ^ x));
+            aux tl
+    in
+      aux files
   in
-  let db_name = Helm_registry.get "matita.basedir" ^ "/" ^ database ^ ".db" in
-  let standard_db_name = 
-    Helm_registry.get "matita.rt_base_dir" ^ "/metadata.db" 
-  in
-  let cp_to_ram_cmd = 
-    if HExtlib.is_regular db_name then
-      "cp " ^ db_name ^ " " ^ tmp_db_name 
+  let db_name = host ^ "/" ^ database in
+  let db_to_open =
+    if HExtlib.is_dir "/dev/shm/" && HExtlib.writable_dir "/dev/shm/" 
+       && (not is_library) 
+    then (
+      let tmp_db_name, first_time = find_db () in      
+      let cp_to_ram_cmd = "cp " ^ db_name ^ " " ^ tmp_db_name in
+      if first_time then 
+        if HExtlib.is_regular db_name then ignore (Sys.command cp_to_ram_cmd)
+        else debug_print ("HSqlite3: no initial db: " ^ db_name)
+      else debug_print "HSqlite3: not copying the db, already in memory";
+      let mv_to_disk_cmd _ = 
+        if first_time then ignore (Sys.command ("mv "^tmp_db_name^" "^db_name)) 
+        else debug_print "HSqlite3: not copying back the db"
+      in
+      at_exit mv_to_disk_cmd;
+      tmp_db_name)
     else
-      (* we start from the standard library *)
-      "cp " ^ standard_db_name ^ " " ^ tmp_db_name
+      db_name
   in
-  ignore (Sys.command cp_to_ram_cmd);
-  let mv_to_disk_cmd _ = 
-    ignore (Sys.command ("mv " ^ tmp_db_name ^ " " ^ db_name)) 
-  in
-  at_exit mv_to_disk_cmd;
-  let db = Sqlite3.db_open tmp_db_name in
+  let db = Sqlite3.db_open db_to_open in
   (* attach the REGEX function *)
-  Sqlite3.create_fun_2 db "REGEXP"
+  Sqlite3.create_fun2 db "REGEXP"
       (fun s rex -> 
+        try
          match rex, s with
          | Sqlite3.Data.TEXT rex, Sqlite3.Data.BLOB s
          | Sqlite3.Data.TEXT rex, Sqlite3.Data.TEXT s ->
@@ -86,7 +116,8 @@ let quick_connect ?host ?(database = "sqlite") ?port ?password ?user () =
                Sqlite3.Data.INT 1L 
              else 
                Sqlite3.Data.INT 0L
-         | _ -> raise (Error "wrong types to 'REGEXP'"));
+         | _ -> raise (Error "wrong types to 'REGEXP'")
+        with exn -> HLog.error (Printexc.to_string exn); raise exn);
   Some db
 ;;
 
@@ -95,11 +126,17 @@ let disconnect db =
   | None -> ()
   | Some db -> 
       let b = Sqlite3.db_close db in
-      if b=false then prerr_endline "No Closed DataBase"
+      if b=false then debug_print "No Closed DataBase"
 ;;
 
 (* XXX hack, sqlite has a print "%q" that should be used, but is not bound *)
-let escape s = Pcre.replace ~pat:"([^'])'([^'])" ~templ:"$1''$2" s
+let escape s = 
+  let s_escaped = Pcre.replace ~pat:"'" ~templ:"''" s in
+  (*let s_escaped = Pcre.replace ~pat:"([^'])'([^'])" ~templ:"$1''$2" s in*)
+  debug_print s;
+  debug_print s_escaped;
+  s_escaped
+;;
 
 let string_of_rc = function
   |Sqlite3.Rc.OK -> "Sqlite3.Rc.OK" 
@@ -135,10 +172,10 @@ let string_of_rc = function
     "Sqlite3.Rc.UNKNOWN " ^ string_of_int (Sqlite3.Rc.int_of_unknown n)
 ;;
 
-let pp_rc rc = prerr_endline (string_of_rc rc);;
+let pp_rc rc = debug_print (string_of_rc rc);;
 
-let exec db s =
- prerr_endline s;
+let exec s db =
+ debug_print s;
   let stored_result = ref [] in
   let store row =
     stored_result := row :: !stored_result
@@ -151,7 +188,7 @@ let exec db s =
       in
       match rc with
       | Sqlite3.Rc.OK -> !stored_result
-      | _ -> raise (Error (string_of_rc rc))
+      | _ -> raise (Error (string_of_rc rc ^ ": " ^ Sqlite3.errmsg db ))
 ;;
 
 let rec map res ~f =