From 19a3943012308a3619ee1ed29714a9ae45362a39 Mon Sep 17 00:00:00 2001
From: Avril <flanchan@cumallover.me>
Date: Thu, 8 Oct 2020 05:28:13 +0100
Subject: [PATCH] working example

---
 Cargo.lock  | 1446 +++++++++++++++++++++++++++++++++++++++++++++++----
 Cargo.toml  |    5 +-
 src/main.rs |  100 ++--
 3 files changed, 1411 insertions(+), 140 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 3d3df23..3308926 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,17 +1,152 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+[[package]]
+name = "aho-corasick"
+version = "0.7.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "043164d8ba5c4c3035fec9bbee8647c0261d788f3474306f93bb65901cae0e86"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "arc-swap"
+version = "0.4.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4d25d88fd6b8041580a654f9d0c581a047baee2b3efee13275f2fc392fc75034"
+
+[[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "winapi 0.3.9",
+]
+
+[[package]]
+name = "autocfg"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d49d90015b3c36167a20fe2810c5cd875ad504b39cff3d4eae7977e6b7c1cb2"
+
 [[package]]
 name = "autocfg"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
 
+[[package]]
+name = "base64"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3441f0f7b02788e948e47f457ca01f1d7e6d92c693bc132c22b087d3141c03ff"
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
+[[package]]
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+checksum = "c0940dc441f31689269e10ac70eb1002a3a1d3ad1390e030043662eb7fe4688b"
+dependencies = [
+ "block-padding",
+ "byte-tools",
+ "byteorder",
+ "generic-array 0.12.3",
+]
+
+[[package]]
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+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4152116fd6e9dadb291ae18fc1ec3575ed6d84c29642d97890f4b4a3417297e4"
+dependencies = [
+ "generic-array 0.14.4",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fa79dedbb091f449f1f39e53edf88d5dbe95f895dae6135a8d7b881fb5af73f5"
+dependencies = [
+ "byte-tools",
+]
+
+[[package]]
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+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b953a6887648bb07a535631f2bc00fbdb2a2216f135552cb3f534ed136b9c07f"
+dependencies = [
+ "memchr",
+ "safemem",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3b5ca7a04898ad4bcd41c90c5285445ff5b791899bb1b0abdd2a2aa791211d7"
+
+[[package]]
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+
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0e4cec68f03f32e44924783795810fa50a7035d8c8ebe78580ad7e6c703fba38"
+
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+[[package]]
+name = "cloudabi"
+version = "0.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ddfc5b9aa5d4507acaf872de71051dfd0e309860e88966e1051e462a077aac4f"
+dependencies = [
+ "bitflags",
+]
+
+[[package]]
+name = "cpuid-bool"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8aebca1129a03dc6dc2b127edd729435bbc4a37e1d5f4d7513165089ceb02634"
+
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+version = "0.8.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f3d0c8c8752312f9713efd397ff63acb9f85585afbf179282e720e7704954dd5"
+dependencies = [
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+
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+version = "0.9.0"
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+checksum = "d3dd60d1080a57a05ab032377049e0591415d2b31afd7028356dbf3cc6dcb066"
+dependencies = [
+ "generic-array 0.14.4",
+]
+
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@@ -24,6 +159,25 @@ version = "1.6.1"
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 checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
 
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+checksum = "44533bbbb3bb3c1fa17d9f2e4e38bbbaf8396ba82193c4cb1b6445d711445d36"
+dependencies = [
+ "atty",
+ "humantime",
+ "log",
+ "regex",
+ "termcolor",
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+
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@@ -31,216 +185,1296 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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+checksum = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
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- "unicode-width",
+ "bitflags",
+ "fuchsia-zircon-sys",
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+checksum = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
+
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- "cfg-if",
- "libc",
- "wasi",
+ "futures-channel",
+ "futures-core",
+ "futures-io",
+ "futures-sink",
+ "futures-task",
+ "futures-util",
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+checksum = "a7a4d35f7401e948629c9c3d6638fb9bf94e0b2121e96c3b428cc4e631f3eb74"
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+checksum = "d674eaa0056896d5ada519900dbf97ead2e46a7b6621e8160d79e2f2e1e2784b"
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+ "futures-core",
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- "serde_derive",
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+ "bytes",
+ "fnv",
+ "futures-core",
+ "futures-sink",
+ "futures-util",
+ "http",
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+ "slab",
+ "tokio",
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+ "futures-core",
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+ "h2",
+ "http",
+ "http-body",
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+ "httpdate",
+ "itoa",
+ "pin-project",
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- "dtoa",
- "linked-hash-map",
- "serde",
- "yaml-rust",
+ "libc",
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 [[package]]
 name = "yaml-rust"
diff --git a/Cargo.toml b/Cargo.toml
index 7a76f0b..b8a9e57 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,4 +8,7 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-chain = {package = "markov", version = "1.1.0"}
\ No newline at end of file
+chain = {package = "markov", version = "1.1.0"}
+tokio = {version = "0.2", features=["full"]}
+warp = "0.2"
+pretty_env_logger = "0.4.0"
diff --git a/src/main.rs b/src/main.rs
index 22f352d..d5c3f68 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,47 +1,81 @@
 use chain::{
     Chain,
 };
+use warp::{
+    Filter,
+    Buf,
+};
 use std::{
-    io::{
-	BufRead,
-	self,
+    sync::Arc,
+};
+use tokio::{
+    sync::{
+	RwLock,
     },
+    stream::{Stream,StreamExt,},
+    prelude::*,
 };
 
-fn buffered_read_all_lines<T: BufRead+?Sized, F: FnMut(&str) -> io::Result<()>>(input: &mut T, mut then: F) -> io::Result<usize>
-{
-    let mut buffer = String::new();
-    let mut read;
-    let mut total=0;
-    while {read = input.read_line(&mut buffer)?; read!=0} {
-	then(&buffer[..])?;
-	buffer.clear();
-	total += read;
+const MAX_CONTENT_LENGTH: u64 = 1024 * 16;
+const MAX_GEN_SIZE: usize = 256;
+
+async fn full_body(chain: &mut Chain<String>, mut body: impl Unpin + Stream<Item = Result<impl Buf, impl std::error::Error + 'static>>) -> Result<(), Box<dyn std::error::Error>> {
+    let mut buffer = Vec::new();
+    
+    while let Some(buf) = body.next().await {
+	let mut body = buf?;
+	while body.has_remaining() {
+	    buffer.extend_from_slice(body.bytes());
+            let cnt = body.bytes().len();
+            body.advance(cnt);
+	}
     }
-    Ok(total)
+
+    let buffer = std::str::from_utf8(&buffer[..])?;
+    chain.feed_str(buffer);
+    Ok(())
 }
 
-fn main() {
-    let stdin = io::stdin();
-    let mut stdin = stdin.lock();
-    let mut chain = Chain::new();
+#[tokio::main]
+async fn main() {
+    pretty_env_logger::init();
+    
+    let chain = Arc::new(RwLock::new(Chain::new()));
+    let chain = warp::any().map(move || Arc::clone(&chain));
 
-    buffered_read_all_lines(&mut stdin, |string| {
-        chain.feed(&string.split_whitespace()
-                   .filter(|word| !word.is_empty())
-                   .map(|s| s.to_owned()).collect::<Vec<_>>());
-	
-	Ok(())
-    }).expect("Failed to read from stdin");
+    let push = warp::put()
+        .and(chain.clone())
+        .and(warp::path("put"))
+        .and(warp::body::content_length_limit(MAX_CONTENT_LENGTH))
+        .and(warp::body::stream())
+        .and_then(|chain: Arc<RwLock<Chain<String>>>, buf| {
+	    async move {
+		use std::ops::DerefMut;
+		let res = format!("{:?}", full_body(chain.write().await.deref_mut(), buf).await);
+		Ok::<String, std::convert::Infallible>(res)
+	    }
+	});
 
-    if !chain.is_empty() {
-	if let Some(num) = std::env::args().skip(1).next() {
-	    let sz: usize = num.parse().expect("Cannot parse number of tokens to generate");
-	    for string in chain.str_iter_for(sz) {
-		println!("{}", string);
+    let read = warp::get()
+        .and(chain.clone())
+        .and(warp::path("get"))
+        .and(warp::path::param().map(|opt: usize| Some(opt)).or(warp::any().map(|| Option::<usize>::None)).unify())
+        .and_then(|chain: Arc<RwLock<Chain<String>>>, num: Option<usize>| {
+	    async move {
+		let chain = chain.read().await;
+		if chain.is_empty() {
+		    Ok(String::default())
+		} else {
+		    match num {
+			Some(num) if num < MAX_GEN_SIZE => Ok(chain.str_iter_for(num).collect()),
+			_ => Ok::<String, std::convert::Infallible>(chain.generate_str()),
+		    }
+		}
 	    }
-	} else {
-	    println!("{}", chain.generate_str());
-	}
-    }
+	});
+
+    warp::serve(push
+		.or(read))
+	.bind_with_graceful_shutdown(([127,0,0,1], 8777), async { tokio::signal::ctrl_c().await.unwrap(); }).1
+	.await
 }