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Implement single-threaded server

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Sayan Nandan 4 years ago
parent 6c0794695e
commit 59dd4a778d
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4 changed files with 565 additions and 7 deletions
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2
libcore/src/lib.rs
Unescape Escape View File

@ -19,4 +19,4 @@
*
*/
mod terrapipe;
pub mod terrapipe;

5
server/Cargo.toml
Unescape Escape View File

@ -1,5 +1,5 @@
[package]
name = "terrabase-server"
name = "terrabase"
version = "0.1.0"
authors = ["Sayan Nandan <nandansayan@outlook.com>"]
edition = "2018"
@ -7,3 +7,6 @@ edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
async-std = "1.6.2"
# Import `libcore` which contains code for terrapipe and other utils
libcore = {path="../libcore"}

111
server/src/main.rs
Unescape Escape View File

@ -8,17 +8,122 @@
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
use libcore::terrapipe::{
Dataframe, QueryMetaframe, QueryMethod, ResponseBytes, ResponseCodes, Version,
DEF_Q_META_BUFSIZE,
};
use std::io::prelude::*;
use std::io::{BufReader, ErrorKind};
use std::net::{TcpListener, TcpStream};
use std::process;
const SELF_VERSION: Version = Version(0, 1, 0);
const EXIT_ERROR: fn(&'static str) -> ! = |err| {
eprintln!("error: {}", err);
process::exit(0x100);
};
fn main() {
println!("Hello, world!");
let listener = match TcpListener::bind("127.0.0.1:2003") {
Ok(binding) => binding,
Err(e) => match e.kind() {
ErrorKind::AddrInUse => {
EXIT_ERROR("Cannot bind to port 2003 as it is already in use");
}
// TODO: Need proper error handling
_ => {
EXIT_ERROR("Some other error occurred!");
}
},
};
for stream in listener.incoming() {
let stream = stream.unwrap();
handle_stream(stream);
}
}
fn handle_stream(mut stream: TcpStream) {
// The largest command that we have right now is UPDATE
// Which along with the size will mount to 26 + 20 = 460usize
let mut meta_buffer = String::with_capacity(DEF_Q_META_BUFSIZE);
let mut bufreader = BufReader::with_capacity(DEF_Q_META_BUFSIZE, &stream);
bufreader.read_line(&mut meta_buffer).unwrap();
let mf = match QueryMetaframe::from_buffer(&SELF_VERSION, &meta_buffer) {
Ok(m) => m,
Err(e) => return close_conn_with_error(stream, e.response_bytes(&SELF_VERSION)),
};
let mut data_buffer = vec![0; mf.get_content_size()];
bufreader.read(&mut data_buffer).unwrap();
let df = match Dataframe::from_buffer(mf.get_content_size(), data_buffer) {
Ok(d) => d,
Err(e) => return close_conn_with_error(stream, e.response_bytes(&SELF_VERSION)),
};
execute_query(stream, mf, df);
}
fn close_conn_with_error(mut stream: TcpStream, error: Vec<u8>) {
stream.write(&error).unwrap();
}
// TODO: This is a dummy implementation
pub fn execute_query(mut stream: TcpStream, mf: QueryMetaframe, df: Dataframe) {
let vars = df.deflatten();
use QueryMethod::*;
match mf.get_method() {
GET => {
if vars.len() == 1 {
println!("GET {}", vars[0]);
} else if vars.len() > 1 {
eprintln!("ERROR: Cannot do multiple GETs just yet");
} else {
stream
.write(&ResponseCodes::CorruptPacket.response_bytes(&SELF_VERSION))
.unwrap();
}
}
SET => {
if vars.len() == 2 {
println!("SET {} {}", vars[0], vars[1]);
} else if vars.len() < 2 {
stream
.write(&ResponseCodes::CorruptPacket.response_bytes(&SELF_VERSION))
.unwrap();
} else {
eprintln!("ERROR: Cannot do multiple SETs just yet");
}
}
UPDATE => {
if vars.len() == 2 {
println!("UPDATE {} {}", vars[0], vars[1]);
} else if vars.len() < 2 {
stream
.write(&ResponseCodes::CorruptPacket.response_bytes(&SELF_VERSION))
.unwrap();
} else {
eprintln!("ERROR: Cannot do multiple UPDATEs just yet");
}
}
DEL => {
if vars.len() == 1 {
println!("DEL {}", vars[0]);
} else if vars.len() > 1 {
eprintln!("ERROR: Cannot do multiple DELs just yet")
} else {
stream
.write(&ResponseCodes::CorruptPacket.response_bytes(&SELF_VERSION))
.unwrap();
}
}
}
}

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