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Cargo.toml

···
+[package]
+name = "valkey-tools"
+version = "0.1.0"
+edition = "2024"
+
+[[bin]]
+name = "valkeyadm"
+path = "src/main.rs"
+
+[dependencies]
+anyhow = "1.0.100"
+clap = { version = "4.5.53", features = ["derive"] }
+redis = "0.32.7"
+tabwriter = "1.4.1"
+thiserror = "2.0.17"

src/main.rs

···
+use anyhow::{Result, bail};
+use clap::{Parser, Subcommand};
+use redis;
+use std::fmt;
+use std::io::Write;
+use std::net::SocketAddr;
+use std::ops::Range;
+use tabwriter::TabWriter;
+
+#[derive(Parser)]
+#[command(version,about,long_about=None)]
+struct Cli {
+    #[command(subcommand)]
+    command: Commands,
+}
+
+#[derive(Subcommand)]
+enum Commands {
+    /// Manage clusters
+    Cluster {
+        #[command(subcommand)]
+        command: ClusterCommands,
+    },
+}
+
+#[derive(Subcommand)]
+enum ClusterCommands {
+    /// Initialize a cluster
+    Init {
+        /// Addresses of nodes to bootstrap the cluster
+        node_addrs: Vec<String>,
+    },
+    /// Rebalance the shards across a cluster
+    Rebalance,
+}
+
+fn main() -> Result<()> {
+    let cli = Cli::parse();
+
+    match &cli.command {
+        Commands::Cluster { command } => match &command {
+            ClusterCommands::Init { node_addrs } => {
+                if node_addrs.len() == 0 {
+                    bail!("At least one node address is required");
+                }
+
+                let addrs = node_addrs.clone();
+                initialize_cluster(addrs)?;
+            }
+            ClusterCommands::Rebalance => {
+                todo!()
+            }
+        },
+    }
+
+    Ok(())
+}
+
+fn initialize_cluster(addrs: Vec<String>) -> Result<()> {
+    let ranges = distribute_slots(NUM_SLOTS, addrs.len());
+    let mut nodes: Vec<Node> = Vec::new();
+    for (address, range) in std::iter::zip(addrs, ranges) {
+        let addr: SocketAddr = address.parse()?;
+        let role = NodeRole::Primary;
+        let slots = range;
+
+        let client_addr = format!("redis://{address}");
+        let client = redis::Client::open(client_addr)?;
+
+        nodes.push(Node {
+            addr,
+            role,
+            slots,
+            client,
+        });
+    }
+
+    let stdout = std::io::stdout().lock();
+    let mut tw = TabWriter::new(stdout);
+    writeln!(&mut tw, "ADDR\tROLE\tSLOTS START\tEND")?;
+
+    for node in nodes {
+        let addr = node.addr();
+        let role = node.role();
+        let slots = node.slots();
+        let slots_start = slots.start;
+        let slots_end = slots.end;
+        writeln!(&mut tw, "{addr}\t{role}\t{slots_start}\t{slots_end}")?;
+    }
+
+    tw.flush()?;
+
+    Ok(())
+}
+
+/// Total number of shard slots available in a cluster.
+const NUM_SLOTS: usize = 16384;
+
+/// Create an even distribution of shard slots across the given number of nodes.
+fn distribute_slots(num_slots: usize, num_nodes: usize) -> Vec<Range<usize>> {
+    let slots_per_node = num_slots / num_nodes;
+    let mut ranges = Vec::with_capacity(num_nodes);
+    for n in 0..num_nodes {
+        let start = n * slots_per_node;
+        let end = start + slots_per_node - 1;
+        let range = Range { start, end };
+        ranges.push(range);
+    }
+    ranges
+}
+
+struct Node {
+    addr: SocketAddr,
+    role: NodeRole,
+    slots: Range<usize>,
+    client: redis::Client,
+}
+
+impl Node {
+    fn addr(&self) -> SocketAddr {
+        self.addr
+    }
+
+    fn role(&self) -> NodeRole {
+        self.role
+    }
+
+    fn slots(&self) -> Range<usize> {
+        self.slots.clone()
+    }
+
+    /// Check to see if the node has already been initialized as a cluster member.
+    fn is_initialized(&self) -> Result<bool> {
+        todo!()
+    }
+}
+
+impl fmt::Display for Node {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let addr = self.addr;
+        let role = self.role;
+        let slots_start = self.slots.start;
+        let slots_end = self.slots.end;
+        write!(f, "{addr} {role} {slots_start}..{slots_end}")
+    }
+}
+
+#[derive(Copy, Clone)]
+enum NodeRole {
+    Primary,
+    Replica,
+}
+
+impl fmt::Display for NodeRole {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self {
+            Self::Primary => write!(f, "primary"),
+            Self::Replica => write!(f, "replica"),
+        }
+    }
+}