public static void Deconstruct <T1, T2, T3>(this IVarTuple value, out T1 item1, out T2 item2, out T3 item3)
{
value.OfSize(3);
item1 = value.Get <T1>(0);
item2 = value.Get <T2>(1);
item3 = value.Get <T3>(2);
}
public static async Task Shards(string[] path, IVarTuple extras, IFdbDatabase db, TextWriter log, CancellationToken ct)
{
var ranges = await Fdb.System.GetChunksAsync(db, FdbKey.MinValue, FdbKey.MaxValue, ct);
Console.WriteLine($"Found {ranges.Count} shards in the whole cluster");
// look if there is something under there
if ((await TryOpenCurrentDirectoryAsync(path, db, ct)) is FdbDirectorySubspace folder)
{
var r = KeyRange.StartsWith(folder.Copy().GetPrefix());
Console.WriteLine($"Searching for shards that intersect with /{String.Join("/", path)} ...");
ranges = await Fdb.System.GetChunksAsync(db, r, ct);
Console.WriteLine($"> Found {ranges.Count} ranges intersecting {r}:");
var last = Slice.Empty;
foreach (var range in ranges)
{
Console.Write($"> {FdbKey.Dump(range.Begin)} ...");
long count = await Fdb.System.EstimateCountAsync(db, range, ct);
Console.WriteLine($" {count:N0}");
last = range.End;
//TODO: we can probably get more details on this shard looking in the system keyspace (where it is, how many replicas, ...)
}
Console.WriteLine($"> ... {FdbKey.Dump(last)}");
}
//Console.WriteLine("Found " + ranges.Count + " shards in the cluster");
//TODO: shards that intersect the current directory
}
/// <summary>Counts the number of keys inside a directory</summary>
public static async Task Count(string[] path, IVarTuple extras, IFdbDatabase db, TextWriter log, CancellationToken ct)
{
// look if there is something under there
var folder = (await TryOpenCurrentDirectoryAsync(path, db, ct)) as FdbDirectorySubspace;
if (folder == null)
{
Program.Error(log, $"# Directory {String.Join("/", path)} does not exist");
return;
}
var copy = folder.Copy();
log.WriteLine($"# Counting keys under {FdbKey.Dump(copy.GetPrefix())} ...");
var progress = new Progress <(long Count, Slice Current)>((state) =>
{
log.Write($"\r# Found {state.Count:N0} keys...");
});
long count = await Fdb.System.EstimateCountAsync(db, copy.ToRange(), progress, ct);
log.Write("\r");
Program.Success(log, $"Found {count:N0} keys in {folder.FullName}");
}
public static void Deconstruct <T1, T2, T3>(this IVarTuple value, [MaybeNull] out T1 item1, [MaybeNull] out T2 item2, [MaybeNull] out T3 item3)
{
value.OfSize(3);
item1 = value.Get <T1>(0) !;
item2 = value.Get <T2>(1) !;
item3 = value.Get <T3>(2) !;
}
/// <summary>Shows the first few keys of a directory</summary>
public static async Task Show(string[] path, IVarTuple extras, bool reverse, IFdbDatabase db, TextWriter log, CancellationToken ct)
{
int count = 20;
if (extras.Count > 0)
{
int x = extras.Get <int>(0);
if (x > 0)
{
count = x;
}
}
if (path == null || path.Length == 0)
{
Program.Error(log, "Cannot directory list the content of Root Partition.");
return;
}
// look if there is something under there
var folder = await db.Directory.TryOpenAsync(db, path, ct : ct);
if (folder != null)
{
if (folder.Layer == FdbDirectoryPartition.LayerId)
{
Program.Error(log, "Cannot list the content of a Directory Partition!");
return;
}
Program.Comment(log, $"# Content of {FdbKey.Dump(folder.GetPrefix())} [{folder.GetPrefix().ToHexaString(' ')}]");
var keys = await db.QueryAsync((tr) =>
{
var query = tr.GetRange(folder.Keys.ToRange());
return(reverse
? query.Reverse().Take(count)
: query.Take(count + 1));
}, ct : ct);
if (keys.Count > 0)
{
if (reverse)
{
keys.Reverse();
}
foreach (var key in keys.Take(count))
{
log.WriteLine($"...{FdbKey.Dump(folder.ExtractKey(key.Key))} = {key.Value:V}");
}
if (!reverse && keys.Count == count + 1)
{
log.WriteLine("... more");
}
}
else
{
log.WriteLine("Folder is empty");
}
}
}
/// <summary>Default (non-optimized) implementation for ITuple.StartsWith()</summary>
/// <param name="a">Larger tuple</param>
/// <param name="b">Smaller tuple</param>
/// <returns>True if <paramref name="a"/> starts with (or is equal to) <paramref name="b"/></returns>
public static bool StartsWith([NotNull] IVarTuple a, [NotNull] IVarTuple b)
{
Contract.Requires(a != null && b != null);
if (object.ReferenceEquals(a, b))
{
return(true);
}
int an = a.Count;
int bn = b.Count;
if (bn > an)
{
return(false);
}
if (bn == 0)
{
return(true); // note: 'an' can only be 0 because of previous test
}
for (int i = 0; i < bn; i++)
{
if (!object.Equals(a[i], b[i]))
{
return(false);
}
}
return(true);
}
/// <summary>Remove a directory and all its data</summary>
public static async Task RemoveDirectory(string[] path, IVarTuple extras, IFdbDatabase db, TextWriter log, CancellationToken ct)
{
if (log == null)
{
log = Console.Out;
}
string layer = extras.Count > 0 ? extras.Get <string>(0) : null;
var folder = await db.Directory.TryOpenAsync(path, ct : ct);
if (folder == null)
{
Program.Error(log, $"# Directory /{string.Join("/", path)} does not exist");
return;
}
// are there any subdirectories ?
var subDirs = await folder.TryListAsync(db, ct);
if (subDirs != null && subDirs.Count > 0)
{
//TODO: "-r" flag ?
Program.Error(log, $"# Cannot remove /{string.Join("/", path)} because it still contains {subDirs.Count:N0} sub-directorie(s)");
}
//TODO: ask for confirmation?
await folder.RemoveAsync(db, ct);
Program.Success(log, $"Deleted directory /{string.Join("/", path)}");
}
public static IVarTuple Splice(IVarTuple tuple, Range range)
{
Contract.Requires(tuple != null);
int count = tuple.Count;
(int start, int len) = range.GetOffsetAndLength(count);
if (len == 0)
{
return(STuple.Empty);
}
if (start == 0 && len == count)
{
return(tuple);
}
switch (len)
{
case 1:
return(new ListTuple <object?>(new[] { tuple[start] }));
case 2:
return(new ListTuple <object?>(new[] { tuple[start], tuple[start + 1] }));
default:
{
var items = new object?[len];
//note: can be slow for tuples using linked-lists, but hopefully they will have their own Slice implementation...
int q = start;
for (int p = 0; p < items.Length; p++)
{
items[p] = tuple[q++];
}
return(new ListTuple <object?>(items.AsMemory()));
}
}
}
/// <summary>Default (non-optimized) implementation for ITuple.EndsWith()</summary>
/// <param name="a">Larger tuple</param>
/// <param name="b">Smaller tuple</param>
/// <returns>True if <paramref name="a"/> starts with (or is equal to) <paramref name="b"/></returns>
public static bool EndsWith(IVarTuple a, IVarTuple b)
{
Contract.Debug.Requires(a != null && b != null);
if (object.ReferenceEquals(a, b))
{
return(true);
}
int an = a.Count;
int bn = b.Count;
if (bn > an)
{
return(false);
}
if (bn == 0)
{
return(true); // note: 'an' can only be 0 because of previous test
}
int offset = an - bn;
for (int i = 0; i < bn; i++)
{
if (!object.Equals(a[offset + i], b[i]))
{
return(false);
}
}
return(true);
}
private static void LogCommand(string prm, IVarTuple extras, TextWriter log)
{
switch (prm.ToLowerInvariant())
{
case "on":
{
LogEnabled = true;
log.WriteLine("# Logging enabled");
break;
}
case "off":
{
LogEnabled = false;
log.WriteLine("# Logging disabled");
break;
}
default:
{
log.WriteLine("# Logging is {0}", LogEnabled ? "ON" : "OFF");
break;
}
}
}
/// <summary>Creates a new directory</summary>
public static async Task CreateDirectory(string[] path, IVarTuple extras, IFdbDatabase db, TextWriter log, CancellationToken ct)
{
if (log == null)
{
log = Console.Out;
}
string layer = extras.Count > 0 ? extras.Get <string>(0) : null;
log.WriteLine($"# Creating directory {String.Join("/", path)} with layer '{layer}'");
var folder = await db.Directory.TryOpenAsync(db, path, ct : ct);
if (folder != null)
{
log.WriteLine($"- Directory {string.Join("/", path)} already exists!");
return;
}
folder = await db.Directory.TryCreateAsync(db, path, Slice.FromString(layer), ct : ct);
log.WriteLine($"- Created under {FdbKey.Dump(folder.GetPrefix())} [{folder.GetPrefix().ToHexaString(' ')}]");
// look if there is already stuff under there
var stuff = await db.ReadAsync((tr) => tr.GetRange(folder.Keys.ToRange()).FirstOrDefaultAsync(), ct : ct);
if (stuff.Key.IsPresent)
{
Program.Error(log, $"CAUTION: There is already some data under {string.Join("/", path)} !");
Program.Error(log, $" {FdbKey.Dump(stuff.Key)} = {stuff.Value:V}");
}
}
public PrefixedTuple(Slice prefix, IVarTuple items)
{
Contract.Debug.Requires(!prefix.IsNull && items != null);
m_prefix = prefix;
m_items = items;
}
/// <summary>Remove a directory and all its data</summary>
public static async Task RemoveDirectory(string[] path, IVarTuple extras, IFdbDatabase db, TextWriter log, CancellationToken ct)
{
if (log == null)
{
log = Console.Out;
}
string layer = extras.Count > 0 ? extras.Get <string>(0) : null;
var folder = await db.Directory.TryOpenAsync(path, ct : ct);
if (folder == null)
{
log.WriteLine("# Directory {0} does not exist", string.Join("/", path));
return;
}
// are there any subdirectories ?
var subDirs = await folder.TryListAsync(db, ct);
if (subDirs != null && subDirs.Count > 0)
{
//TODO: "-r" flag ?
log.WriteLine("# Cannot remove {0} because it still contains {1} sub-directorie(s)", string.Join("/", path), subDirs.Count);
}
//TODO: ask for confirmation?
log.WriteLine("# Deleting directory {0} ...", String.Join("/", path));
await folder.RemoveAsync(db, ct);
log.WriteLine("# Gone!");
}
/// <summary>Create a new list tuple by merging the items of three tuples together</summary>
public ListTuple(IVarTuple a, IVarTuple b, IVarTuple c)
{
Contract.NotNull(a, nameof(a));
Contract.NotNull(b, nameof(b));
Contract.NotNull(c, nameof(c));
int nA = a.Count;
int nB = b.Count;
int nC = c.Count;
m_offset = 0;
m_count = nA + nB + nC;
m_items = new object[m_count];
if (nA > 0)
{
a.CopyTo(m_items, 0);
}
if (nB > 0)
{
b.CopyTo(m_items, nA);
}
if (nC > 0)
{
c.CopyTo(m_items, nA + nB);
}
}
public static T Last <T>(this IVarTuple tuple)
{
#if USE_RANGE_API
return(tuple.Get <T>(^ 1));
#else
return(tuple.Get <T>(-1));
#endif
}
/// <summary>Test if the end of current tuple is equal to another tuple</summary>
/// <param name="left">Larger tuple</param>
/// <param name="right">Smaller tuple</param>
/// <returns>True if the end of <paramref name="left"/> is equal to <paramref name="right"/> or if both tuples are identical</returns>
public static bool EndsWith(this IVarTuple left, IVarTuple right)
{
Contract.NotNull(left, nameof(left));
Contract.NotNull(right, nameof(right));
//REVIEW: move this on ITuple interface ?
return(TupleHelpers.EndsWith(left, right));
}
/// <summary>Append a new value at the end of an existing tuple</summary>
public LinkedTuple(IVarTuple head, T tail)
{
Contract.NotNull(head);
this.Head = head;
this.Tail = tail;
this.Depth = head.Count;
}
/// <summary>Returns a typed version of a tuple of size 2</summary>
/// <typeparam name="T1">Expected type of the first element</typeparam>
/// <typeparam name="T2">Expected type of the second element</typeparam>
/// <param name="tuple">Tuple that must be of size 2</param>
/// <returns>Equivalent tuple, with its elements converted to the specified types</returns>
public static ValueTuple <T1, T2> As <T1, T2>(this IVarTuple tuple)
{
tuple.OfSize(2);
return(
tuple.Get <T1>(0),
tuple.Get <T2>(1)
);
}
public static void Deconstruct <T1, T2, T3, T4, T5>(this IVarTuple value, [MaybeNull] out T1 item1, [MaybeNull] out T2 item2, [MaybeNull] out T3 item3, [MaybeNull] out T4 item4, [MaybeNull] out T5 item5)
{
value.OfSize(5);
item1 = value.Get <T1>(0) !;
item2 = value.Get <T2>(1) !;
item3 = value.Get <T3>(2) !;
item4 = value.Get <T4>(3) !;
item5 = value.Get <T5>(4) !;
}
/// <summary>Returns a typed version of a tuple of size 3</summary>
/// <typeparam name="T1">Expected type of the first element</typeparam>
/// <typeparam name="T2">Expected type of the second element</typeparam>
/// <typeparam name="T3">Expected type of the third element</typeparam>
/// <param name="tuple">Tuple that must be of size 3</param>
/// <returns>Equivalent tuple, with its elements converted to the specified types</returns>
public static ValueTuple <T1, T2, T3> As <T1, T2, T3>([NotNull] this IVarTuple tuple)
{
tuple.OfSize(3);
return(
tuple.Get <T1>(0),
tuple.Get <T2>(1),
tuple.Get <T3>(2)
);
}
public static void Deconstruct <T1, T2, T3, T4, T5>(this IVarTuple value, out T1 item1, out T2 item2, out T3 item3, out T4 item4, out T5 item5)
{
value.OfSize(5);
item1 = value.Get <T1>(0);
item2 = value.Get <T2>(1);
item3 = value.Get <T3>(2);
item4 = value.Get <T4>(3);
item5 = value.Get <T5>(4);
}
public static async Task Dump(string[] path, string output, IVarTuple extras, IFdbDatabase db, TextWriter log, CancellationToken ct)
{
// look if there is something under there
var folder = await db.Directory.TryOpenAsync(db, path, ct : ct);
if (folder == null)
{
Program.Comment(log, $"# Directory {String.Join("/", path)} does not exist");
return;
}
//TODO: if file already exists, ask confirmation before overriding?
output = Path.GetFullPath(output);
File.Delete(output);
using (var fs = new FileStream(output, FileMode.Create, FileAccess.Write, FileShare.Read, 64 * 1024))
using (var sw = new StreamWriter(fs, Encoding.UTF8, 32 * 1024))
{
Program.Comment(log, $"# Dumping content of {FdbKey.Dump(folder.GetPrefix())} [{folder.GetPrefix().ToHexaString(' ')}] to {output}");
long bytes = 0;
var kr = new[] { '|', '/', '-', '\\' };
int p = 0;
var count = await Fdb.Bulk.ExportAsync(
db,
folder.ToRange(),
(batch, offset, _ct) =>
{
if (log == Console.Out)
{
log.Write($"\r{kr[(p++) % kr.Length]} {bytes:N0} bytes");
}
foreach (var kv in batch)
{
bytes += kv.Key.Count + kv.Value.Count;
sw.WriteLine("{0} = {1:V}", FdbKey.Dump(folder.ExtractKey(kv.Key)), kv.Value);
}
ct.ThrowIfCancellationRequested();
return(sw.FlushAsync());
},
ct
);
if (log == Console.Out)
{
log.Write("\r");
}
if (count > 0)
{
Program.Success(log, $"Found {count:N0} keys ({bytes:N0} bytes)");
}
else
{
Program.StdOut(log, "Folder is empty.");
}
}
}
public JoinedTuple(IVarTuple head, IVarTuple tail)
{
Contract.NotNull(head, nameof(head));
Contract.NotNull(tail, nameof(tail));
this.Head = head;
this.Tail = tail;
m_split = head.Count;
m_count = m_split + tail.Count;
}
/// <summary>Helper to copy the content of a tuple at a specific position in an array</summary>
/// <returns>Updated offset just after the last element of the copied tuple</returns>
public static int CopyTo([NotNull] IVarTuple tuple, [NotNull] object[] array, int offset)
{
Contract.Requires(tuple != null && array != null && offset >= 0);
foreach (var item in tuple)
{
array[offset++] = item;
}
return(offset);
}
/// <summary>Returns a typed version of a tuple of size 4</summary>
/// <typeparam name="T1">Expected type of the first element</typeparam>
/// <typeparam name="T2">Expected type of the second element</typeparam>
/// <typeparam name="T3">Expected type of the third element</typeparam>
/// <typeparam name="T4">Expected type of the fourth element</typeparam>
/// <param name="tuple">Tuple that must be of size 4</param>
/// <returns>Equivalent tuple, with its elements converted to the specified types</returns>
public static ValueTuple <T1, T2, T3, T4> As <T1, T2, T3, T4>(this IVarTuple tuple)
{
tuple.OfSize(4);
return(
tuple.Get <T1>(0),
tuple.Get <T2>(1),
tuple.Get <T3>(2),
tuple.Get <T4>(3)
);
}
public PrefixedTuple Concat(IVarTuple tuple)
{
Contract.NotNull(tuple);
if (tuple.Count == 0)
{
return(this);
}
return(new PrefixedTuple(m_prefix, m_items.Concat(tuple)));
}
/// <summary>Returns a typed version of a tuple of size 5</summary>
/// <typeparam name="T1">Expected type of the first element</typeparam>
/// <typeparam name="T2">Expected type of the second element</typeparam>
/// <typeparam name="T3">Expected type of the third element</typeparam>
/// <typeparam name="T4">Expected type of the fourth element</typeparam>
/// <typeparam name="T5">Expected type of the fifth element</typeparam>
/// <param name="tuple">Tuple that must be of size 5</param>
/// <returns>Equivalent tuple, with its elements converted to the specified types</returns>
public static ValueTuple <T1, T2, T3, T4, T5> As <T1, T2, T3, T4, T5>([NotNull] this IVarTuple tuple)
{
tuple.OfSize(5);
return(
tuple.Get <T1>(0),
tuple.Get <T2>(1),
tuple.Get <T3>(2),
tuple.Get <T4>(3),
tuple.Get <T5>(4)
);
}
public static void Deconstruct <T1, T2, T3, T4, T5, T6, T7>(this IVarTuple value, out T1 item1, out T2 item2, out T3 item3, out T4 item4, out T5 item5, out T6 item6, out T7 item7)
{
value.OfSize(7);
item1 = value.Get <T1>(0);
item2 = value.Get <T2>(1);
item3 = value.Get <T3>(2);
item4 = value.Get <T4>(3);
item5 = value.Get <T5>(4);
item6 = value.Get <T6>(5);
item7 = value.Get <T7>(6);
}
protected override FdbDirectoryLayer GetLayerForPath(IVarTuple relativeLocation)
{
if (relativeLocation.Count == 0)
{ // Forward all actions on the Partition itself (empty path) to its parent's DL
return(this.ParentDirectoryLayer);
}
else
{ // For everything else, use the Partition's DL
return(this.DirectoryLayer);
}
}
public static void Deconstruct <T1, T2, T3, T4, T5, T6, T7>(this IVarTuple value, [MaybeNull] out T1 item1, [MaybeNull] out T2 item2, [MaybeNull] out T3 item3, [MaybeNull] out T4 item4, [MaybeNull] out T5 item5, [MaybeNull] out T6 item6, [MaybeNull] out T7 item7)
{
value.OfSize(7);
item1 = value.Get <T1>(0) !;
item2 = value.Get <T2>(1) !;
item3 = value.Get <T3>(2) !;
item4 = value.Get <T4>(3) !;
item5 = value.Get <T5>(4) !;
item6 = value.Get <T6>(5) !;
item7 = value.Get <T7>(6) !;
}
