private unsafe string MarshalAndFreeRocksDbString(IntPtr resultPtr, long resultLength, Encoding encoding)
{
var result = CurrentFramework.CreateString((sbyte *)resultPtr.ToPointer(), 0, (int)resultLength, encoding);
rocksdb_free(resultPtr);
return(result);
}
private unsafe int Comparator_Compare(IntPtr state, IntPtr a, UIntPtr alen, IntPtr b, UIntPtr blen)
{
var getComparatorPtr = (*((ComparatorState *)state)).GetComparatorPtr;
var getComparator = CurrentFramework.GetDelegateForFunctionPointer <GetComparator>(getComparatorPtr);
var comparator = getComparator();
return(comparator.Compare(a, alen, b, blen));
}
public static T LoadFunc <T>(INativeLibImporter importer, IntPtr libraryHandle, string entryPoint)
{
IntPtr procAddress = importer.GetProcAddress(libraryHandle, entryPoint);
if (procAddress == IntPtr.Zero)
{
throw new NativeLoadException(string.Format("Unable to get address of {0} ({1})", entryPoint, typeof(T)), null);
}
return(CurrentFramework.GetDelegateForFunctionPointer <T>(procAddress));
}
public unsafe ComparatorBase(string name = null, IntPtr state = default(IntPtr))
{
Name = name ?? GetType().FullName;
_destroy = s => this.Destroy(s);
Handle = Native.Instance.rocksdb_comparator_create(
state: IntPtr.Zero,
destructor: CurrentFramework.GetFunctionPointerForDelegate(_destroy),
compare: CurrentFramework.GetFunctionPointerForDelegate <CompareFunc>(Compare),
getName: CurrentFramework.GetFunctionPointerForDelegate <GetNameFunc>(GetName)
);
}
/// <summary>
/// Returns true if a particular target runtime is available.
/// </summary>
/// <param name="framework">The framework being sought</param>
/// <returns>True if it's available, false if not</returns>
public static bool IsAvailable(RuntimeFramework framework)
{
switch (framework.Runtime)
{
case RuntimeType.Mono:
return(IsMonoInstalled());
case RuntimeType.Net:
return(CurrentFramework.Matches(framework) || IsDotNetInstalled(framework.Version));
default:
return(false);
}
}
/// <summary>
/// REQUIRES: The client must provide a merge operator if Merge operation
/// needs to be accessed. Calling Merge on a DB without a merge operator
/// would result in Status::NotSupported. The client must ensure that the
/// merge operator supplied here has the same name and *exactly* the same
/// semantics as the merge operator provided to previous open calls on
/// the same DB. The only exception is reserved for upgrade, where a DB
/// previously without a merge operator is introduced to Merge operation
/// for the first time. It's necessary to specify a merge operator when
/// openning the DB in this case.
/// Default: nullptr
/// </summary>
public ColumnFamilyOptions SetMergeOperator(MergeOperator mergeOperator)
{
// Allocate some memory for the name bytes
var name = mergeOperator.Name ?? mergeOperator.GetType().FullName;
var nameBytes = Encoding.UTF8.GetBytes(name + "\0");
var namePtr = Marshal.AllocHGlobal(nameBytes.Length);
Marshal.Copy(nameBytes, 0, namePtr, nameBytes.Length);
// Hold onto a reference to everything that needs to stay alive
MergeOperatorRef = new MergeOperatorReferences
{
GetMergeOperator = () => mergeOperator,
DestructorDelegate = MergeOperator_Destroy,
NameDelegate = MergeOperator_GetNamePtr,
DeleteValueDelegate = MergeOperator_DeleteValue,
FullMergeDelegate = MergeOperator_FullMerge,
PartialMergeDelegate = MergeOperator_PartialMerge,
};
// Allocate the state
var state = new MergeOperatorState
{
NamePtr = namePtr,
GetMergeOperatorPtr = CurrentFramework.GetFunctionPointerForDelegate <GetMergeOperator>(MergeOperatorRef.GetMergeOperator)
};
var statePtr = Marshal.AllocHGlobal(Marshal.SizeOf(state));
Marshal.StructureToPtr(state, statePtr, false);
// Create the merge operator
IntPtr handle = Native.Instance.rocksdb_mergeoperator_create(
state: statePtr,
destructor: MergeOperatorRef.DestructorDelegate,
delete_value: MergeOperatorRef.DeleteValueDelegate,
full_merge: MergeOperatorRef.FullMergeDelegate,
partial_merge: MergeOperatorRef.PartialMergeDelegate,
name: MergeOperatorRef.NameDelegate
);
return(SetMergeOperator(handle));
}
/// <summary>
/// Comparator used to define the order of keys in the table.
/// Default: a comparator that uses lexicographic byte-wise ordering
///
/// REQUIRES: The client must ensure that the comparator supplied
/// here has the same name and orders keys *exactly* the same as the
/// comparator provided to previous open calls on the same DB.
/// </summary>
public ColumnFamilyOptions SetComparator(Comparator comparator)
{
// Allocate some memory for the name bytes
var name = comparator.Name ?? comparator.GetType().FullName;
var nameBytes = Encoding.UTF8.GetBytes(name + "\0");
var namePtr = Marshal.AllocHGlobal(nameBytes.Length);
Marshal.Copy(nameBytes, 0, namePtr, nameBytes.Length);
// Hold onto a reference to everything that needs to stay alive
ComparatorRef = new ComparatorReferences
{
GetComparator = () => comparator,
CompareDelegate = Comparator_Compare,
DestructorDelegate = Comparator_Destroy,
NameDelegate = Comparator_GetNamePtr,
};
// Allocate the state
var state = new ComparatorState
{
NamePtr = namePtr,
GetComparatorPtr = CurrentFramework.GetFunctionPointerForDelegate <GetComparator>(ComparatorRef.GetComparator)
};
var statePtr = Marshal.AllocHGlobal(Marshal.SizeOf(state));
Marshal.StructureToPtr(state, statePtr, false);
// Create the comparator
IntPtr handle = Native.Instance.rocksdb_comparator_create(
state: statePtr,
destructor: ComparatorRef.DestructorDelegate,
compare: ComparatorRef.CompareDelegate,
name: ComparatorRef.NameDelegate
);
return(SetComparator(handle));
}
/// <summary>
/// Executes a multi_get with automatic marshalling
/// </summary>
/// <param name="db"></param>
/// <param name="read_options"></param>
/// <param name="keys"></param>
/// <param name="numKeys">when non-zero, specifies the number of keys in the array to fetch</param>
/// <param name="keyLengths">when non-null specifies the lengths of each key to fetch</param>
/// <param name="errptrs">when non-null, must be an array that will be populated with error codes</param>
/// <param name="values">when non-null is a pre-allocated array to put the resulting values in</param>
/// <param name="cf"></param>
/// <returns></returns>
public unsafe KeyValuePair <string, string>[] rocksdb_multi_get(
IntPtr db,
IntPtr read_options,
string[] keys,
IntPtr[] errptrs,
ulong numKeys = 0,
KeyValuePair <string, string>[] values = null,
ColumnFamilyHandle[] cf = null,
Encoding encoding = null)
{
if (encoding == null)
{
encoding = Encoding.UTF8;
}
int count = numKeys == 0 ? keys.Length : (int)numKeys;
IntPtr[] keyPtrs = new IntPtr[count];
var keyLengths = new ulong[count];
IntPtr[] valuePtrs = new IntPtr[count];
ulong[] valueLengths = new ulong[count];
if (values == null)
{
values = new KeyValuePair <string, string> [count];
}
if (errptrs == null)
{
errptrs = new IntPtr[count];
}
// first we have to encode each key
for (int i = 0; i < count; i++)
{
var key = keys[i];
fixed(char *k = key)
{
var klength = key.Length;
int bklength = encoding.GetByteCount(k, klength);
var bk = Marshal.AllocHGlobal(bklength);
encoding.GetBytes(k, klength, (byte *)bk.ToPointer(), bklength);
keyPtrs[i] = bk;
keyLengths[i] = (ulong)bklength;
}
}
if (cf == null)
{
rocksdb_multi_get(db, read_options, (ulong)count, keyPtrs, keyLengths, valuePtrs, valueLengths, errptrs);
}
else
{
IntPtr[] cfhs = new IntPtr[cf.Length];
for (int i = 0; i < count; i++)
{
cfhs[i] = cf[i].Handle;
}
rocksdb_multi_get_cf(db, read_options, cfhs, (ulong)count, keyPtrs, keyLengths, valuePtrs, valueLengths, errptrs);
}
// free the buffers allocated for each encoded key
foreach (var keyPtr in keyPtrs)
{
Marshal.FreeHGlobal(keyPtr);
}
// now marshal all of the values
for (int i = 0; i < count; i++)
{
var resultPtr = valuePtrs[i];
if (resultPtr != IntPtr.Zero)
{
var bv = (sbyte *)resultPtr.ToPointer();
var bvLength = valueLengths[i];
values[i] = new KeyValuePair <string, string>(keys[i], CurrentFramework.CreateString(bv, 0, (int)bvLength, encoding));
rocksdb_free(resultPtr);
}
else
{
values[i] = new KeyValuePair <string, string>(keys[i], null);
}
}
return(values);
}
private unsafe string MarshalString(IntPtr resultPtr, long resultLength, Encoding encoding)
{
return(CurrentFramework.CreateString((sbyte *)resultPtr.ToPointer(), 0, (int)resultLength, encoding));
}
public static T Import <T>(INativeLibImporter importer, string libName, string version, bool suppressUnload) where T : class
{
var subdir = GetArchName(RuntimeInformation.ProcessArchitecture);
var assemblyName = new AssemblyName("DynamicLink");
var assemblyBuilder = CurrentFramework.DefineDynamicAssembly(assemblyName, System.Reflection.Emit.AssemblyBuilderAccess.Run);
var moduleBuilder = assemblyBuilder.DefineDynamicModule("DynLinkModule");
string typeName = typeof(T).Name + "_impl";
var typeBuilder = moduleBuilder.DefineType(typeName, TypeAttributes.Public | TypeAttributes.Class | TypeAttributes.AutoClass | TypeAttributes.AnsiClass | TypeAttributes.BeforeFieldInit | TypeAttributes.AutoLayout, typeof(T));
FieldBuilder field_importer = typeBuilder.DefineField("importer", typeof(INativeLibImporter), FieldAttributes.Private | FieldAttributes.InitOnly);
FieldBuilder field_libraryHandle = typeBuilder.DefineField("libraryHandle", typeof(IntPtr), FieldAttributes.Private | FieldAttributes.InitOnly);
var methods = typeof(T).GetTypeInfo().GetMethods(BindingFlags.Public | BindingFlags.Instance).Where(m => m.IsAbstract && !m.IsGenericMethod).ToArray();
// Define delegate types for each of the method signatures
var delegateMap = new Dictionary <string, Type>();
foreach (var method in methods)
{
var sig = GetMethodSig(method);
if (delegateMap.ContainsKey(sig))
{
continue;
}
var delegateTypeInfo = CreateDelegateType(moduleBuilder, method);
delegateMap.Add(sig, delegateTypeInfo.AsType());
}
// Define one field for each method to hold a delegate
var delegates = methods.Select(m => new {
MethodInfo = m,
DelegateType = delegateMap[GetMethodSig(m)],
}).ToArray();
var fields = delegates.Select((d, i) => typeBuilder.DefineField($"{d.MethodInfo.Name}_func_{i}", d.DelegateType, FieldAttributes.Private)).ToArray();
// Create the constructor which will initialize the importer and library handle
// and also use the importer to populate each of the delegate fields
ConstructorBuilder constructor = typeBuilder.DefineConstructor(MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.SpecialName | MethodAttributes.RTSpecialName, CallingConventions.Standard, new Type[] { typeof(INativeLibImporter), typeof(IntPtr) });
{
var baseConstructor = typeof(T).GetTypeInfo().GetConstructors().Where(con => con.GetParameters().Length == 0).First();
ILGenerator il = constructor.GetILGenerator();
// Call base constructor
il.Emit(OpCodes.Ldarg_0); // this
il.Emit(OpCodes.Call, baseConstructor);
// Store importer field
il.Emit(OpCodes.Ldarg_0); // this
il.Emit(OpCodes.Ldarg_1); // importer
il.Emit(OpCodes.Stfld, field_importer);
// Load and store library handle
il.Emit(OpCodes.Ldarg_0); // this
il.Emit(OpCodes.Ldarg_2); // library handle
il.Emit(OpCodes.Stfld, field_libraryHandle);
var getDelegateMethod = typeof(INativeLibImporter).GetTypeInfo().GetMethod("GetDelegate");
// Initialize each delegate field
for (int i = 0; i < fields.Length; i++)
{
var delegateType = delegates[i].DelegateType;
il.Emit(OpCodes.Ldarg_0); // this
il.Emit(OpCodes.Ldarg_1); // importer
il.Emit(OpCodes.Ldarg_0); // this
il.Emit(OpCodes.Ldfld, field_libraryHandle);
il.Emit(OpCodes.Ldstr, delegates[i].MethodInfo.Name); // use method name from original class as entry point
il.Emit(OpCodes.Ldtoken, delegateType); // the delegate type
il.Emit(OpCodes.Call, typeof(System.Type).GetTypeInfo().GetMethod("GetTypeFromHandle")); // typeof()
il.Emit(OpCodes.Callvirt, getDelegateMethod); // importer.GetDelegate()
il.Emit(OpCodes.Isinst, delegateType); // as <delegate type>
il.Emit(OpCodes.Stfld, fields[i]);
}
// End of constructor
il.Emit(OpCodes.Ret);
}
// Create destructor
var destructor = typeBuilder.DefineMethod("Finalize", MethodAttributes.Family | MethodAttributes.Virtual | MethodAttributes.HideBySig);
{
var baseDestructor = typeof(T).GetTypeInfo().GetMethod("Finalize", BindingFlags.NonPublic | BindingFlags.Instance);
var il = destructor.GetILGenerator();
var end = il.DefineLabel();
il.BeginExceptionBlock();
if (!suppressUnload)
{
il.Emit(OpCodes.Ldarg_0); // this
il.Emit(OpCodes.Ldfld, field_importer); // .importer
il.Emit(OpCodes.Ldarg_0); // this
il.Emit(OpCodes.Ldfld, field_libraryHandle); // .libraryHandle
il.Emit(OpCodes.Callvirt, typeof(INativeLibImporter).GetTypeInfo().GetMethod("FreeLibrary")); // INativeLibImporter::FreeLibrary()
}
//il.Emit(OpCodes.Leave, end);
il.BeginFinallyBlock();
il.Emit(OpCodes.Ldarg_0); // this
il.Emit(OpCodes.Call, baseDestructor); // object::Finalize()
//il.Emit(OpCodes.Endfinally);
il.EndExceptionBlock();
il.MarkLabel(end);
il.Emit(OpCodes.Ret);
}
// Now override each method from the base class
for (int i = 0; i < fields.Length; i++)
{
var baseMethod = delegates[i].MethodInfo;
var args = baseMethod.GetParameters();
var omethod = typeBuilder.DefineMethod(
baseMethod.Name,
(baseMethod.Attributes & ~(MethodAttributes.Abstract | MethodAttributes.NewSlot)) | MethodAttributes.Virtual,
baseMethod.CallingConvention,
baseMethod.ReturnType,
args.Select(arg => arg.ParameterType).ToArray()
);
var il = omethod.GetILGenerator();
il.Emit(OpCodes.Ldarg_0); // this
il.Emit(OpCodes.Ldfld, fields[i]); // {field}
if (args.Length >= 1)
{
il.Emit(OpCodes.Ldarg_1);
}
if (args.Length >= 2)
{
il.Emit(OpCodes.Ldarg_2);
}
if (args.Length >= 3)
{
il.Emit(OpCodes.Ldarg_3);
}
for (short argNum = 4; argNum <= args.Length; argNum++)
{
il.Emit(OpCodes.Ldarg_S, argNum);
}
il.Emit(OpCodes.Tailcall);
il.Emit(OpCodes.Callvirt, delegates[i].DelegateType.GetTypeInfo().GetMethod("Invoke"));
il.Emit(OpCodes.Ret);
}
var type = typeBuilder.CreateTypeInfo();
var versionParts = version.Split('.');
var names = versionParts.Select((p, i) => libName + "-" + string.Join(".", versionParts.Take(i + 1)))
.Reverse()
.Concat(Enumerable.Repeat(libName, 1));
// try to load locally
var paths = new[]
{
Path.Combine("native", subdir),
"native",
subdir,
"",
};
// If the RocksDbNative package is referenced, then dynamically load it here so that it can tell us where the native libraries are
string nativeCodeBase = null;
try
{
var nativeLibName = new AssemblyName("RocksDbNative");
var native = Assembly.Load(nativeLibName);
var nativePkgClass = native.GetTypes().First(t => t.FullName == "RocksDbSharp.NativePackage");
var getCodeBaseMethod = nativePkgClass.GetTypeInfo().GetMethod("GetCodeBase");
var getCodeBase = getCodeBaseMethod.CreateDelegate <Func <string> >();
nativeCodeBase = getCodeBase();
}
catch (Exception)
{
}
var basePaths = new string[] {
nativeCodeBase,
Path.GetDirectoryName(UriToPath(Transitional.CurrentFramework.GetBaseDirectory())),
Path.GetDirectoryName(UriToPath(Assembly.GetEntryAssembly()?.CodeBase)),
Path.GetDirectoryName(Assembly.GetEntryAssembly()?.Location),
Path.GetDirectoryName(UriToPath(typeof(PosixImporter).GetTypeInfo().Assembly.CodeBase)),
Path.GetDirectoryName(typeof(PosixImporter).GetTypeInfo().Assembly.Location),
};
var search = basePaths
.Where(p => p != null)
.Distinct()
.SelectMany(basePath =>
paths.SelectMany(path => names.Select(n => Path.Combine(basePath, path, importer.Translate(n))))
.Concat(names.Select(n => importer.Translate(n)))
)
.Select(path => new SearchPath {
Path = path
})
.ToArray();
foreach (var spec in search)
{
var construct = type.GetConstructor(new Type[] { typeof(INativeLibImporter), typeof(IntPtr) });
IntPtr lib = IntPtr.Zero;
try
{
lib = importer.LoadLibrary(spec.Path);
if (lib == IntPtr.Zero)
{
throw new NativeLoadException("LoadLibrary returned 0", null);
}
}
catch (TargetInvocationException tie)
{
spec.Error = tie.InnerException;
continue;
}
catch (Exception e)
{
spec.Error = e;
continue;
}
var obj = construct.Invoke(new object[] { importer, lib });
var t = obj as T;
return(t);
}
throw new NativeLoadException("Unable to locate rocksdb native library, either install it, or use RocksDbNative nuget package\nSearched:\n" + string.Join("\n", search.Select(s => $"{s.Path}: ({s.Error.GetType().Name}) {s.Error.Message}")), null);
}
private static MergeOperator GetMergeOperatorFromPtr(IntPtr getMergeOperatorPtr)
{
var getMergeOperator = CurrentFramework.GetDelegateForFunctionPointer <GetMergeOperator>(getMergeOperatorPtr);
return(getMergeOperator());
}