Added mdb_env_info to native methods

Author: ilyalukyanov

src/LightningDB/LightningDB.csproj

@@ -109,6 +109,7 @@
     <Compile Include="LightningTransaction.cs" />
     <Compile Include="LightningVersionInfo.cs" />
     <Compile Include="Native\MarshalValueStructure.cs" />
+    <Compile Include="Native\MDBEnvInfo.cs" />
     <Compile Include="Native\MDBStat.cs" />
     <Compile Include="Native\Native.cs" />
     <Compile Include="Native\NativeLibraryFacades.cs">

src/LightningDB/Native/INativeLibraryFacade.cs

@@ -304,6 +304,14 @@ interface INativeLibraryFacade
         /// <param name="path">The directory in which the copy will reside. This directory must already exist and be writable but must otherwise be empty.</param>
         /// <returns>A non-zero error value on failure and 0 on success.</returns>
         int mdb_env_copy(IntPtr env, string path); //OK
+        
+        /// <summary>
+        /// Return information about the LMDB environment.
+        /// </summary>
+        /// <param name="env">An environment handle returned by mdb_env_create()</param>
+        /// <param name="stat">The address of an MDB_envinfo structure where the information will be copied</param>
+        /// <returns></returns>
+        int mdb_env_info (IntPtr env, out MDBEnvInfo stat);
 
         /// <summary>
         /// Flush the data buffers to disk. 

src/LightningDB/Native/MDBEnvInfo.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace LightningDB.Native
+{
+    [StructLayout(LayoutKind.Sequential)]
+    struct MDBEnvInfo
+    {
+        public IntPtr me_mapaddr;
+        public IntPtr me_mapsize;
+        public IntPtr me_last_pgno;
+        public IntPtr me_last_txnid;
+        public uint me_maxreaders;
+        public uint me_numreaders;
+    }
+}

src/LightningDB/Native/NativeLibraryFacades.cs

@@ -73,6 +73,9 @@ class Native32BitLibraryFacade : INativeLibraryFacade
         [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl)]
         private static extern int mdb_env_copy(IntPtr env, string path);
 
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl)]
+        private static extern int mdb_env_info (IntPtr env, out MDBEnvInfo stat);
+
         [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl)]
         private static extern int mdb_env_sync(IntPtr env, bool force);
 
@@ -220,6 +223,11 @@ int INativeLibraryFacade.mdb_env_copy(IntPtr env, string path)
             return Native32BitLibraryFacade.mdb_env_copy(env, path);
         }
 
+        int INativeLibraryFacade.mdb_env_info (IntPtr env, out MDBEnvInfo stat)
+        {
+            return Native32BitLibraryFacade.mdb_env_info(env, out stat);
+        }
+
         int INativeLibraryFacade.mdb_env_sync(IntPtr env, bool force)
         {
             return Native32BitLibraryFacade.mdb_env_sync(env, force);
@@ -342,6 +350,9 @@ class Native64BitLibraryFacade : INativeLibraryFacade
         [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl)]
         private static extern int mdb_env_copy(IntPtr env, string path);
 
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl)]
+        private static extern int mdb_env_info (IntPtr env, out MDBEnvInfo stat);
+
         [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl)]
         private static extern int mdb_env_sync(IntPtr env, bool force);
 
@@ -477,6 +488,11 @@ int INativeLibraryFacade.mdb_env_copy(IntPtr env, string path)
             return Native64BitLibraryFacade.mdb_env_copy(env, path);
         }
 
+        int INativeLibraryFacade.mdb_env_info (IntPtr env, out MDBEnvInfo stat)
+        {
+            return Native64BitLibraryFacade.mdb_env_info(env, out stat);
+        }
+
         int INativeLibraryFacade.mdb_env_sync(IntPtr env, bool force)
         {
             return Native64BitLibraryFacade.mdb_env_sync(env, force);
@@ -599,6 +615,9 @@ class FallbackLibraryFacade : INativeLibraryFacade
         [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl)]
         private static extern int mdb_env_copy(IntPtr env, string path);
 
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl)]
+        private static extern int mdb_env_info (IntPtr env, out MDBEnvInfo stat);
+
         [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl)]
         private static extern int mdb_env_sync(IntPtr env, bool force);
 
@@ -746,6 +765,11 @@ int INativeLibraryFacade.mdb_env_copy(IntPtr env, string path)
             return FallbackLibraryFacade.mdb_env_copy(env, path);
         }
 
+        int INativeLibraryFacade.mdb_env_info (IntPtr env, out MDBEnvInfo stat)
+        {
+            return FallbackLibraryFacade.mdb_env_info(env, out stat);
+        }
+
         int INativeLibraryFacade.mdb_env_sync(IntPtr env, bool force)
         {
             return FallbackLibraryFacade.mdb_env_sync(env, force);

src/LightningDB/Native/NativeLibraryFacades.tt

@@ -88,6 +88,9 @@ namespace LightningDB.Native
         [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl)]
         private static extern int mdb_env_copy(IntPtr env, string path);
 
+        [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl)]
+        private static extern int mdb_env_info (IntPtr env, out MDBEnvInfo stat);
+
         [DllImport(LibraryName, CallingConvention = CallingConvention.Cdecl)]
         private static extern int mdb_env_sync(IntPtr env, bool force);
 
@@ -239,6 +242,11 @@ namespace LightningDB.Native
             return <#= pair.Value #>LibraryFacade.mdb_env_copy(env, path);
         }
 
+        int INativeLibraryFacade.mdb_env_info (IntPtr env, out MDBEnvInfo stat)
+        {
+            return <#= pair.Value #>LibraryFacade.mdb_env_info(env, out stat);
+        }
+
         int INativeLibraryFacade.mdb_env_sync(IntPtr env, bool force)
         {
             return <#= pair.Value #>LibraryFacade.mdb_env_sync(env, force);