drocks 0.1.1

RocksServer db client


To use this package, run the following command in your project's root directory:

Drocks is a Dlang driver for RocksDB server RocksServer Drocks is a Dlang driver for RocksDB server RocksServer

Dub version License

Usage

Create

auto db = Client(host, port);

or

auto db = Client.createDefault();

Get

By single key

string value = db.get(key);
string value = db[key];

By multi keys

auto values = db.get(key1, key2, key3);
auto values = db.get([key1, key2, key3]);
auto values = db.get(keysRange);

auto values = db[key1, key2, key3];
auto values = db[[key1, key2, key3]];
auto values = db[keysRange];

Set / Replace

By single key

db.set(key, value);
db.set(Pair(key, value));
db[key] = value;

By multi keys

auto range = [
    Pair(key1, val1),
    Pair(key2, val2),
    Pair(key3, val3),
];
db.set(range);
auto range = [
    tuple(key1, val1),
    tuple(key2, val2),
    tuple(key3, val3),
];
db.set(range);
auto map = [
    key1: val1,
    key2: val2,
    key3: val3,
];
db.set(map);

Delete keys

db.del(key);
db.del(key1, key2, key3);
db.del([key1, key2, key3]);
db.del(keysRange);

Increment value by key

db.incr(key, value);
db.incr(key);

db[key] += 7;
db[key] += -4;
db[key] -= 1;
++db[key];
--db[key];

Check if key exist

bool keyExist = db.has(key);
auto keyExist = db.has(key);
bool   has   = db.has(key).has;
string value = db.has(key).value;

Prefix iterator

auto range = db.getall(KeysPrefix);

Seek key and iterate

db.set([
    "w:a" : "v-w:a",
    "w:c" : "v-w:c",
    "w:e" : "v-w:e",
    "w:g" : "v-w:g",
    "w:h" : "v-w:h",
    "w:l" : "v-w:l",
    "x:a" : "v-x:a",
    "x:c" : "v-x:c",
]);

db.seekPrev("w:d") retrieves range:

["w:c", "w:e", "w:g", "w:h", "w:l", "x:a", "x:c"]

db.seekPrev("w:d", "w:") retrieves range:

["w:c", "w:e", "w:g", "w:h", "w:l"]

db.seekPrev("w:e") retrieves range:

["w:e", "w:g", "w:h", "w:l", "x:a", "x:c"]

db.seekPrev("w:e", "w:") retrieves range:

["w:e", "w:g", "w:h", "w:l"]

db.seekPrev("0:e") retrieves all pairs

db.seekPrev("0:e", "w:") retrieves empty range

db.seekPrevRange("w:d", "x:b") retrieves range:

["w:c", "w:e", "w:g", "w:h", "w:l", "x:a"]

db.seekPrevRange("w:d", "x:b", "w:") retrieves range:

["w:c", "w:e", "w:g", "w:h", "w:l"]

db.seekPrevRange("w:e", "x:b") retrieves range:

["w:e", "w:g", "w:h", "w:l", "x:a"]

db.seekPrevRange("w:e", "x:a") retrieves range:

["w:e", "w:g", "w:h", "w:l", "x:a"]

db.seekPrevRange("w:e", "x:b", "w:") retrieves range:

["w:e", "w:g", "w:h", "w:l"]

db.seekNext("w:d") retrieves range:

["w:c", "w:e", "w:g", "w:h", "w:l", "x:a", "x:c"]

db.seekNext("w:d", "w:") retrieves range:

["w:c", "w:e", "w:g", "w:h", "w:l"]

db.seekNext("w:e") retrieves range:

["w:e", "w:g", "w:h", "w:l", "x:a", "x:c"]

db.seekNext("w:e", "w:") retrieves range:

["w:e", "w:g", "w:h", "w:l"]

db.seekNext("0:e") retrieves all pairs

db.seekNext("0:e", "w:") retrieves empty range

db.seekNextRange("w:d", "x:b") retrieves range:

["w:c", "w:e", "w:g", "w:h", "w:l", "x:a"]

db.seekNextRange("w:d", "x:b", "w:") retrieves range:

["w:c", "w:e", "w:g", "w:h", "w:l"]

db.seekNextRange("w:e", "x:b") retrieves range:

["w:e", "w:g", "w:h", "w:l", "x:a"]

db.seekNextRange("w:e", "x:a") retrieves range:

["w:e", "w:g", "w:h", "w:l", "x:a"]

db.seekNextRange("w:e", "x:b", "w:") retrieves range:

["w:e", "w:g", "w:h", "w:l"]

More details

For more details see exmaples, tests and sources

How to extend

import drocks;
struct CustomClient
{
    mixin ExtendClient;
    //...
}

See exmaple:

struct CustomClient
{
    mixin ExtendClient;

    // incriment value by key
    long getIncr(string key, long value)
    {
        return _db.request.httpPost("get-incr", key, value).getValue().to!long;
    }
    long getIncr(string key)
    {
        return _db.request.httpPost("get-incr", key).getValue().to!long;
    }

    // Check if DB server is available
    bool ping() //const
    {
        return "pong" == _db.request.httpGet("ping").raw();
    }

    // Seack first pair by key prefix
    auto seekFirst(string prefix)
    {
        return _db.request.httpGet("seek-first", prefix).getPair();
    }

    // ...
}
try {
    auto db = CustomClient.createDefault();
    db.get("key1").writeln;
    db.getIncr("incr1").writeln;
    db.ping().writeln;
    db.seekFirst("key-prefix:").writeln;
} catch (ClientException e) {
    writeln(e.msg);
}

Tests

see tests readme

License

MIT

Authors:
  • Valmat
Dependencies:
none
Versions:
0.1.1 2019-Jun-13
0.1.0 2019-May-31
0.0.1 2019-Jan-24
~master 2019-Jun-13
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