Add a CLI utility to send commands to the sync client.

Cargo.lock

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 "checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
-"checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"

Cargo.toml

@@ -6,4 +6,8 @@ edition = "2018"
 
 [dependencies]
 fswatcher = { path = "./fswatcher" }
-hyper = "0.13"
+structopt = "0.3"
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+dirs = "2.0"
+byteorder = "1.3"

src/bin/cli.rs

@@ -0,0 +1,99 @@
+use std::io::{self, Write};
+use std::net::Shutdown;
+use std::os::unix::net::UnixStream;
+use std::path::PathBuf;
+
+use byteorder::{BigEndian, ReadBytesExt};
+use serde::{Deserialize, Serialize};
+use structopt::StructOpt;
+
+const SOCKET_PATH: &str = "$HOME/.twfss/sock";
+
+pub fn socket_path() -> String {
+    SOCKET_PATH
+        .to_owned()
+        .replace("$HOME", dirs::home_dir().unwrap().to_str().unwrap())
+}
+
+#[derive(StructOpt, Serialize, Deserialize)]
+#[structopt(about = "CLI for the two-way file system sync client")]
+pub struct Options {
+    #[structopt(long)]
+    pub verbose: bool,
+    #[structopt(subcommand)]
+    pub command: Command,
+}
+
+#[derive(StructOpt, Serialize, Deserialize)]
+pub enum Command {
+    ListDirectories {
+        status: bool,
+    },
+    AddDirectory {
+        local_directory: PathBuf,
+        remote_url: String,
+    },
+    RemoveDirectory {
+        local_directory: PathBuf,
+    },
+}
+
+// The file is included in the sync client, where main() is unused.
+#[allow(unused)]
+fn main() {
+    let options = Options::from_args();
+
+    // We simply send the options to the server and print whatever the server returns.
+    let mut client = match SyncClient::connect() {
+        Ok(client) => client,
+        Err(err) => {
+            println!(
+                "Could not connect to the sync client. Make sure that the sync client is running."
+            );
+            println!("Error: {:?}", err);
+            std::process::exit(-1);
+        }
+    };
+    let return_code = client.execute(options).unwrap();
+    std::process::exit(return_code);
+}
+
+struct SyncClient {
+    stream: UnixStream,
+}
+
+impl SyncClient {
+    fn connect() -> Result<SyncClient, Error> {
+        let stream = UnixStream::connect(socket_path()).unwrap();
+        Ok(SyncClient { stream })
+    }
+
+    fn execute(&mut self, options: Options) -> Result<i32, Error> {
+        let json = serde_json::to_string(&options)?;
+        self.stream.write_all(json.as_bytes())?;
+        self.stream.shutdown(Shutdown::Write).unwrap();
+        // The first 4 bytes are the return value.
+        let return_value = self.stream.read_i32::<BigEndian>()?;
+        // Print all the output returned by the server.
+        io::copy(&mut self.stream, &mut io::stdout())?;
+        Ok(return_value)
+    }
+}
+
+#[derive(Debug)]
+enum Error {
+    Json(serde_json::error::Error),
+    Io(std::io::Error),
+}
+
+impl From<serde_json::error::Error> for Error {
+    fn from(e: serde_json::error::Error) -> Error {
+        Error::Json(e)
+    }
+}
+
+impl From<io::Error> for Error {
+    fn from(e: io::Error) -> Error {
+        Error::Io(e)
+    }
+}

src/bin/client.rs

@@ -1,3 +1,77 @@
+use std::io::{self, Read, Write};
+use std::os::unix::net::{UnixListener, UnixStream};
+use std::thread;
+
+mod cli;
+
 fn main() {
-    println!("Hello, world!");
+    // Initialize the existing synchronized directories.
+    // TODO
+
+    // TODO: Register signal handler for graceful shutdown.
+
+    // Listen for CLI commands.
+    // TODO: Graceful shutdown on errors.
+    let listener = UnixListener::bind(cli::socket_path()).unwrap();
+    for stream in listener.incoming() {
+        match stream {
+            Ok(stream) => {
+                thread::spawn(move || {
+                    let mut stream = stream;
+                    match handle_cli_client(&mut stream) {
+                        Ok(()) => {}
+                        Err(e) => {
+                            // Log error and try to send it to the stream.
+                            // TODO
+                            write!(stream, "Error: {:?}", e).ok();
+                        }
+                    };
+                });
+            }
+            Err(err) => {
+                eprintln!("Error while listening on the local unix socket: {:?}", err);
+                break;
+            }
+        }
+    }
+}
+
+fn handle_cli_client(stream: &mut UnixStream) -> Result<(), Error> {
+    let mut request = String::new();
+    stream.read_to_string(&mut request)?;
+
+    let options: cli::Options = serde_json::from_str(&request)?;
+    let _verbose = options.verbose;
+    match options.command {
+        _cmd @ cli::Command::ListDirectories { .. } => {
+            // TODO
+        }
+        _cmd @ cli::Command::AddDirectory { .. } => {
+            // TODO
+        }
+        _cmd @ cli::Command::RemoveDirectory { .. } => {
+            // TODO
+        }
+    }
+
+    // TODO
+    Ok(())
+}
+
+#[derive(Debug)]
+enum Error {
+    Json(serde_json::error::Error),
+    Io(std::io::Error),
+}
+
+impl From<serde_json::error::Error> for Error {
+    fn from(e: serde_json::error::Error) -> Error {
+        Error::Json(e)
+    }
+}
+
+impl From<io::Error> for Error {
+    fn from(e: io::Error) -> Error {
+        Error::Io(e)
+    }
 }

src/bin/server.rs

@@ -1,3 +1,3 @@
 fn main() {
-    println!("Hello, world!");
+    // TODO
 }