SwiftNIO Redis is a Swift package that contains a high performance Redis protocol implementation for SwiftNIO. This is a standalone project and has no other dependencies but SwiftNIO.
Apart from the protocol implementation which can encode and decode RESP (REdis Serialization Protocol), we also provide a Redis client module build on top.
What is Redis? Redis is a highly scalable in-memory data structure store, used as a database, cache and message broker. For example it can be used to implement a session store backing a web backend using its "expiring keys" feature, or it can be used as a relay to implement a chat server using its builtin PubSub features.
This Swift package contains a simple Redis client based on the protocol implementation swift-nio-redis. We also provide an actual Redis Server written in Swift, using SwiftNIO and SwiftNIO Redis.
An example Package.swift importing the necessary modules:
// swift-tools-version:5.0
import PackageDescription
let package = Package(
name: "RedisTests",
dependencies: [
.package(url: "https://github.com/NozeIO/swift-nio-redis-client.git",
from: "0.10.0")
],
targets: [
.target(name: "MyClientTool",
dependencies: [ "Redis" ])
]
)The
Redis
client module is modeled after the Node.js
node_redis
module,
but it also supports NIO like Promise/Future based methods in addition
to the Node.js (err,result) style callbacks. Choose your poison.
import Redis
let client = Redis.createClient()
client.set ("counter", 0, expire: 2)
client.incr("counter", by: 10)
client.get ("counter") { err, value in
print("Reply:", value)
}
client.keys("*") { err, reply in
guard let keys = reply else { return print("got no keys!") }
print("all keys in store:", keys.joined(separator: ","))
}Using NIO Promises:
client
.set ("counter", 0, expire: 2)
.then {
client.incr("counter", by: 10)
}
.then {
client.get("counter")
}
.map {
print("counter is:", $0)
}The
protocol implementation
is considered complete. There are a few open ends
in the telnet variant, yet the regular binary protocol is considered done.
The Redis client module has a few more open ends, but seems to work fine.
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