From 23f888270e281cbd974ecef691932677a6e5937b Mon Sep 17 00:00:00 2001
From: Edu4rdSHL <edu4rdshl@protonmail.com>
Date: Wed, 9 Jun 2021 19:38:12 -0500
Subject: [PATCH] Initial commit.

Signed-off-by: Edu4rdSHL <edu4rdshl@protonmail.com>
---
 .gitignore            |    2 +
 .vscode/launch.json   |   19 +
 .vscode/tasks.json    |   15 +
 Cargo.lock            | 1206 +++++++++++++++++++++++++++++++++++++++++
 Cargo.toml            |   13 +
 examples/webtail.conf |    2 +
 src/args.rs           |   18 +
 src/cli.yml           |   34 ++
 src/lib.rs            |    6 +
 src/main.rs           |   58 ++
 src/structs.rs        |   21 +
 src/utils.rs          |   32 ++
 src/worker.rs         |   61 +++
 static/index.html     |   24 +
 14 files changed, 1511 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 .vscode/launch.json
 create mode 100644 .vscode/tasks.json
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 examples/webtail.conf
 create mode 100644 src/args.rs
 create mode 100644 src/cli.yml
 create mode 100644 src/lib.rs
 create mode 100644 src/main.rs
 create mode 100644 src/structs.rs
 create mode 100644 src/utils.rs
 create mode 100644 src/worker.rs
 create mode 100644 static/index.html

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..eed3cc5
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+*.txt
diff --git a/.vscode/launch.json b/.vscode/launch.json
new file mode 100644
index 0000000..cbfe946
--- /dev/null
+++ b/.vscode/launch.json
@@ -0,0 +1,19 @@
+{
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+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "lldb",
+            "request": "launch",
+            "name": "Debug",
+            "program": "${workspaceRoot}/target/debug/${workspaceRootFolderName}",
+            "args": "-f slack3",
+            "cwd": "${workspaceRoot}",
+            "sourceLanguages": [
+                "rust"
+            ]
+        }
+    ]
+}
\ No newline at end of file
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
new file mode 100644
index 0000000..568d43d
--- /dev/null
+++ b/.vscode/tasks.json
@@ -0,0 +1,15 @@
+{
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+    "tasks": [
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+            "type": "shell",
+            "command": "cargo build",
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "problemMatcher": []
+        }
+    ]
+}
\ No newline at end of file
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..8f035db
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fd6fbd9a79829dd1ad0cc20627bf1ed606756a7f77edff7b66b7064f9cb327c6"
+
+[[package]]
+name = "webtail-rs"
+version = "0.1.0"
+dependencies = [
+ "clap",
+ "rayon",
+ "rocket",
+ "rocket_contrib",
+]
+
+[[package]]
+name = "winapi"
+version = "0.2.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-build"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi 0.3.9",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "ws2_32-sys"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"
+dependencies = [
+ "winapi 0.2.8",
+ "winapi-build",
+]
+
+[[package]]
+name = "yaml-rust"
+version = "0.3.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e66366e18dc58b46801afbf2ca7661a9f59cc8c5962c29892b6039b4f86fa992"
+
+[[package]]
+name = "yansi"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..9f55d5e
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "webtail-rs"
+version = "0.1.0"
+authors = ["Edu4rdSHL <edu4rdshl@protonmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+rocket = { version = "0.4.10", features = ["sse"] }
+rocket_contrib = "0.4.7"
+clap = { version = "2.33.3", features = ["yaml"] }
+rayon = "1.5.1"
diff --git a/examples/webtail.conf b/examples/webtail.conf
new file mode 100644
index 0000000..0e44b31
--- /dev/null
+++ b/examples/webtail.conf
@@ -0,0 +1,2 @@
+file1.txt:8080
+file2.txt:9090
diff --git a/src/args.rs b/src/args.rs
new file mode 100644
index 0000000..232b8ed
--- /dev/null
+++ b/src/args.rs
@@ -0,0 +1,18 @@
+use {
+    crate::structs::Args,
+    clap::{load_yaml, value_t, App},
+};
+
+#[allow(clippy::cognitive_complexity)]
+pub fn get_args() -> Args {
+    let yaml = load_yaml!("cli.yml");
+    let matches = App::from_yaml(yaml)
+        .version(clap::crate_version!())
+        .get_matches();
+    Args {
+        file_name: value_t!(matches.value_of("file"), String).unwrap_or_default(),
+        delay: value_t!(matches.value_of("delay"), u64).unwrap_or(1),
+        port: value_t!(matches.value_of("port"), u16).unwrap_or(8080),
+        config_file: value_t!(matches.value_of("config"), String).unwrap_or_default(),
+    }
+}
diff --git a/src/cli.yml b/src/cli.yml
new file mode 100644
index 0000000..7d6eb83
--- /dev/null
+++ b/src/cli.yml
@@ -0,0 +1,34 @@
+name: webtail-rs
+author: Eduard Tolosa <edu4rdshl@protonmail.com>
+settings:
+  - ArgRequiredElseHelp
+  - StrictUtf8
+about: tail -f for your browser.
+args:
+  - file:
+      short: f
+      long: file
+      help: File to follow.
+      takes_value: true
+      multiple: false
+
+  - delay:
+      short: d
+      long: delay
+      help: Time between reads.
+      takes_value: true
+      multiple: false
+
+  - port:
+      short: p
+      long: port
+      help: Port to use.
+      takes_value: true
+      multiple: false
+
+  - config:
+      short: c
+      long: config
+      help: Config file to use. You can use the path:port syntax for viewing multiple files.
+      takes_value: true
+      multiple: false
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..0b2f8bf
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,6 @@
+#![feature(proc_macro_hygiene, decl_macro)]
+
+pub mod args;
+pub mod structs;
+pub mod utils;
+pub mod worker;
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..ae2851a
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,58 @@
+use std::{collections::HashMap, u16};
+
+use webtail_rs::{
+    structs::{File, State},
+    utils,
+};
+
+use {
+    rayon::prelude::*,
+    rocket::{
+        config::{Config, Environment, LoggingLevel},
+        routes,
+    },
+    rocket_contrib::serve::StaticFiles,
+    webtail_rs::{args, worker::*},
+};
+
+fn main() {
+    let args = args::get_args();
+
+    if args.file_name.is_empty() && args.config_file.is_empty() {
+        eprintln!("No files to process.");
+        std::process::exit(1)
+    }
+
+    let mut input_files: HashMap<String, u16> = HashMap::new();
+
+    if !args.config_file.is_empty() {
+        let buffer = utils::return_bufreader(&args.config_file);
+        input_files = utils::read_config_file(buffer);
+    }
+    if !args.file_name.is_empty() {
+        input_files.insert(args.file_name.clone(), args.port);
+    }
+
+    input_files
+        .par_iter()
+        .map(|(file, port)| {
+            println!("=> Watching file {} in port {}\n", file, port);
+            let error = rocket::custom(
+                Config::build(Environment::Production)
+                    .log_level(LoggingLevel::Off)
+                    .port(port.to_owned())
+                    .unwrap(),
+            )
+            .manage(File {
+                data: String::new(),
+                name: file.clone(),
+                state: State::Write,
+                delay: args.delay,
+            })
+            .mount("/", routes![updates])
+            .mount("/", StaticFiles::from("static"))
+            .launch();
+            eprintln!("Launch failed! Error: {}", error);
+        })
+        .collect::<Vec<()>>();
+}
diff --git a/src/structs.rs b/src/structs.rs
new file mode 100644
index 0000000..393e9f3
--- /dev/null
+++ b/src/structs.rs
@@ -0,0 +1,21 @@
+#[derive(Clone)]
+pub struct Args {
+    pub file_name: String,
+    pub delay: u64,
+    pub port: u16,
+    pub config_file: String,
+}
+
+pub struct File {
+    pub data: String,
+    pub state: State,
+    pub name: String,
+    pub delay: u64,
+}
+
+#[derive(Clone, Copy)]
+pub enum State {
+    Flush,
+    Sleep,
+    Write,
+}
diff --git a/src/utils.rs b/src/utils.rs
new file mode 100644
index 0000000..d1b914e
--- /dev/null
+++ b/src/utils.rs
@@ -0,0 +1,32 @@
+use std::{
+    collections::HashMap,
+    fs::File,
+    io::{BufRead, BufReader},
+};
+
+pub fn return_bufreader(file: &str) -> BufReader<File> {
+    match std::fs::File::open(file) {
+        Ok(file) => BufReader::new(file),
+        Err(e) => {
+            eprintln!("Error reading the file: {}. Error: {}", file, e);
+            std::process::exit(1)
+        }
+    }
+}
+
+pub fn read_config_file(buffer: BufReader<File>) -> HashMap<String, u16> {
+    let mut data: HashMap<String, u16> = HashMap::new();
+    for line in buffer.lines() {
+        let line_str = line.expect("Error");
+        let data_vec = line_str.split(':').collect::<Vec<&str>>();
+        if data_vec.len() == 2 {
+            data.insert(
+                data_vec.get(0).unwrap().to_string(),
+                data_vec.get(1).unwrap().parse().unwrap_or_else(|_| {
+                    panic!("Error reading the port for the line {:?}", data_vec)
+                }),
+            );
+        }
+    }
+    data
+}
diff --git a/src/worker.rs b/src/worker.rs
new file mode 100644
index 0000000..12dde53
--- /dev/null
+++ b/src/worker.rs
@@ -0,0 +1,61 @@
+use rocket::response::{Content, Stream};
+
+use {
+    crate::{
+        structs::{File, State},
+        utils,
+    },
+    rocket::{get, http::ContentType},
+    std::{
+        io::{self, prelude::*, BufReader, Read, Write},
+        time::Duration,
+    },
+};
+
+const BUF_SIZE: usize = 52428800;
+
+impl Read for File {
+    fn read(&mut self, mut buf: &mut [u8]) -> io::Result<usize> {
+        match self.state {
+            State::Flush => {
+                self.state = State::Sleep;
+                return Err(io::ErrorKind::WouldBlock.into());
+            }
+            State::Sleep => std::thread::sleep(Duration::from_secs(self.delay)),
+            State::Write => {}
+        }
+
+        self.state = State::Flush;
+
+        self.data.clear();
+
+        self.data += &format!("data: Watching file {}\ndata: \n", self.name);
+
+        for line in utils::return_bufreader(&self.name).lines() {
+            self.data += &format!("data: {}\n", line.expect("Error"))
+        }
+        self.data += "\n\n";
+
+        buf.write_all(self.data.as_bytes())?;
+
+        Ok(self.data.len())
+    }
+}
+
+type CounterStream = Stream<BufReader<File>>;
+
+#[get("/updates")]
+pub fn updates(file_data: rocket::State<File>) -> Content<CounterStream> {
+    let reader = BufReader::with_capacity(
+        BUF_SIZE,
+        File {
+            data: file_data.data.clone(),
+            state: file_data.state,
+            name: file_data.name.clone(),
+            delay: file_data.delay,
+        },
+    );
+
+    let ct = ContentType::with_params("text", "event-stream", ("charset", "utf-8"));
+    Content(ct, Stream::from(reader))
+}
diff --git a/static/index.html b/static/index.html
new file mode 100644
index 0000000..57bf7dd
--- /dev/null
+++ b/static/index.html
@@ -0,0 +1,24 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width">
+  <title>Webtail RS</title>
+</head>
+
+<body>
+  <div id="spong">Loading...</div>
+</body>
+<script charset="utf-8">
+  status_node = document.getElementById('spong');
+  status_node.innerText = 'Waiting...';
+
+  es = new EventSource("updates");
+  es.onmessage = function (event) {
+    console.log(event);
+    status_node.innerText = event.data;
+  };
+</script>
+
+</html>