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Optimized Favicon downloading
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Some optimizations in regards to downloading Favicon's.

I also encounterd some issues with accessing some sites where the
connection got dropped or closed early. This seems a reqwest/hyper
thingy, hyperium/hyper#2136. This is now also
fixed.

General:

- Decreased struct size
- Decreased memory allocations
- Optimized tokenizer a bit more to only emit tags when all attributes are there and are valid.

reqwest/hyper connection issue:
The following changes helped solve the connection issues to some sites.
The endresult is that some icons are now able to be downloaded always instead of sometimes.

- Enabled some extra reqwest features, `deflate` and `native-tls-alpn`
  (Which do not bring in any extra crates since other crates already enabled them, but they were not active for Vaultwarden it self)
- Configured reqwest to have a max amount of idle pool connections per host
- Configured reqwest to timeout the idle connections in 10 seconds
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@BlackDex
BlackDex committed Aug 13, 2023
1 parent d1af468 commit 6cdcb3b
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Showing 2 changed files with 116 additions and 108 deletions.
2 changes: 1 addition & 1 deletion Cargo.toml
View file
Original file line number Diff line number Diff line change
Expand Up @@ -124,7 +124,7 @@ email_address = "0.2.4"
handlebars = { version = "4.3.7", features = ["dir_source"] }

# HTTP client (Used for favicons, version check, DUO and HIBP API)
reqwest = { version = "0.11.18", features = ["stream", "json", "gzip", "brotli", "socks", "cookies", "trust-dns"] }
reqwest = { version = "0.11.18", features = ["stream", "json", "deflate", "gzip", "brotli", "socks", "cookies", "trust-dns", "native-tls-alpn"] }

# Favicon extraction libraries
html5gum = "0.5.7"
Expand Down
222 changes: 115 additions & 107 deletions src/api/icons.rs
View file
Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,7 @@ use tokio::{
net::lookup_host,
};

use html5gum::{Emitter, EndTag, HtmlString, InfallibleTokenizer, Readable, StartTag, StringReader, Tokenizer};
use html5gum::{Emitter, HtmlString, InfallibleTokenizer, Readable, StringReader, Tokenizer};

use crate::{
error::Error,
Expand All @@ -46,10 +46,15 @@ static CLIENT: Lazy<Client> = Lazy::new(|| {
// Generate the cookie store
let cookie_store = Arc::new(Jar::default());

let icon_download_timeout = Duration::from_secs(CONFIG.icon_download_timeout());
let pool_idle_timeout = Duration::from_secs(10);
// Reuse the client between requests
let client = get_reqwest_client_builder()
.cookie_provider(Arc::clone(&cookie_store))
.timeout(Duration::from_secs(CONFIG.icon_download_timeout()))
.timeout(icon_download_timeout)
.pool_max_idle_per_host(5) // Configure the Hyper Pool to only have max 5 idle connections
.pool_idle_timeout(pool_idle_timeout) // Configure the Hyper Pool to timeout after 10 seconds
.trust_dns(true)
.default_headers(default_headers.clone());

match client.build() {
Expand All @@ -58,9 +63,11 @@ static CLIENT: Lazy<Client> = Lazy::new(|| {
error!("Possible trust-dns error, trying with trust-dns disabled: '{e}'");
get_reqwest_client_builder()
.cookie_provider(cookie_store)
.timeout(Duration::from_secs(CONFIG.icon_download_timeout()))
.default_headers(default_headers)
.timeout(icon_download_timeout)
.pool_max_idle_per_host(5) // Configure the Hyper Pool to only have max 5 idle connections
.pool_idle_timeout(pool_idle_timeout) // Configure the Hyper Pool to timeout after 10 seconds
.trust_dns(false)
.default_headers(default_headers)
.build()
.expect("Failed to build client")
}
Expand Down Expand Up @@ -258,7 +265,7 @@ mod tests {
}
}

#[derive(Debug, Clone)]
#[derive(Clone)]
enum DomainBlacklistReason {
Regex,
IP,
Expand Down Expand Up @@ -415,38 +422,34 @@ fn get_favicons_node(
const TAG_LINK: &[u8] = b"link";
const TAG_BASE: &[u8] = b"base";
const TAG_HEAD: &[u8] = b"head";
const ATTR_REL: &[u8] = b"rel";
const ATTR_HREF: &[u8] = b"href";
const ATTR_SIZES: &[u8] = b"sizes";

let mut base_url = url.clone();
let mut icon_tags: Vec<StartTag> = Vec::new();
let mut icon_tags: Vec<Tag> = Vec::new();
for token in dom {
match token {
FaviconToken::StartTag(tag) => {
if *tag.name == TAG_LINK
&& tag.attributes.contains_key(ATTR_REL)
&& tag.attributes.contains_key(ATTR_HREF)
{
let rel_value = std::str::from_utf8(tag.attributes.get(ATTR_REL).unwrap())
.unwrap_or_default()
.to_ascii_lowercase();
if rel_value.contains("icon") && !rel_value.contains("mask-icon") {
icon_tags.push(tag);
}
} else if *tag.name == TAG_BASE && tag.attributes.contains_key(ATTR_HREF) {
let href = std::str::from_utf8(tag.attributes.get(ATTR_HREF).unwrap()).unwrap_or_default();
let tag_name: &[u8] = &token.tag.name;
match tag_name {
TAG_LINK => {
icon_tags.push(token.tag);
}
TAG_BASE => {
base_url = if let Some(href) = token.tag.attributes.get(ATTR_HREF) {
let href = std::str::from_utf8(href).unwrap_or_default();
debug!("Found base href: {href}");
base_url = match base_url.join(href) {
match base_url.join(href) {
Ok(inner_url) => inner_url,
_ => url.clone(),
};
}
_ => continue,
}
} else {
continue;
};
}
FaviconToken::EndTag(tag) => {
if *tag.name == TAG_HEAD {
break;
}
TAG_HEAD if token.closing => {
break;
}
_ => {
continue;
}
}
}
Expand Down Expand Up @@ -820,43 +823,64 @@ impl reqwest::cookie::CookieStore for Jar {
}

/// Custom FaviconEmitter for the html5gum parser.
/// The FaviconEmitter is using an almost 1:1 copy of the DefaultEmitter with some small changes.
/// The FaviconEmitter is using an optimized version of the DefaultEmitter.
/// This prevents emitting tags like comments, doctype and also strings between the tags.
/// But it will also only emit the tags we need and only if they have the correct attributes
/// Therefor parsing the HTML content is faster.
use std::collections::{BTreeSet, VecDeque};
use std::collections::BTreeMap;

#[derive(Default)]
pub struct Tag {
/// The tag's name, such as `"link"` or `"base"`.
pub name: HtmlString,

#[derive(Debug)]
enum FaviconToken {
StartTag(StartTag),
EndTag(EndTag),
/// A mapping for any HTML attributes this start tag may have.
///
/// Duplicate attributes are ignored after the first one as per WHATWG spec.
pub attributes: BTreeMap<HtmlString, HtmlString>,
}

#[derive(Default, Debug)]
struct FaviconToken {
tag: Tag,
closing: bool,
}

#[derive(Default)]
struct FaviconEmitter {
current_token: Option<FaviconToken>,
last_start_tag: HtmlString,
current_attribute: Option<(HtmlString, HtmlString)>,
seen_attributes: BTreeSet<HtmlString>,
emitted_tokens: VecDeque<FaviconToken>,
emit_token: bool,
}

impl FaviconEmitter {
fn emit_token(&mut self, token: FaviconToken) {
self.emitted_tokens.push_front(token);
}
fn flush_current_attribute(&mut self, emit_current_tag: bool) {
const ATTR_HREF: &[u8] = b"href";
const ATTR_REL: &[u8] = b"rel";
const TAG_LINK: &[u8] = b"link";
const TAG_BASE: &[u8] = b"base";
const TAG_HEAD: &[u8] = b"head";

if let Some(ref mut token) = self.current_token {
let tag_name: &[u8] = &token.tag.name;

if self.current_attribute.is_some() && (tag_name == TAG_BASE || tag_name == TAG_LINK) {
let (k, v) = self.current_attribute.take().unwrap();
token.tag.attributes.entry(k).and_modify(|_| {}).or_insert(v);
}

fn flush_current_attribute(&mut self) {
if let Some((k, v)) = self.current_attribute.take() {
match self.current_token {
Some(FaviconToken::StartTag(ref mut tag)) => {
tag.attributes.entry(k).and_modify(|_| {}).or_insert(v);
}
Some(FaviconToken::EndTag(_)) => {
self.seen_attributes.insert(k);
}
_ => {
debug_assert!(false);
let tag_attr = &token.tag.attributes;
match tag_name {
TAG_HEAD if token.closing => self.emit_token = true,
TAG_BASE if tag_attr.contains_key(ATTR_HREF) => self.emit_token = true,
TAG_LINK if emit_current_tag && tag_attr.contains_key(ATTR_REL) && tag_attr.contains_key(ATTR_HREF) => {
let rel_value =
std::str::from_utf8(token.tag.attributes.get(ATTR_REL).unwrap()).unwrap_or_default();
if rel_value.contains("icon") && !rel_value.contains("mask-icon") {
self.emit_token = true
}
}
_ => (),
}
}
}
Expand All @@ -871,87 +895,71 @@ impl Emitter for FaviconEmitter {
}

fn pop_token(&mut self) -> Option<Self::Token> {
self.emitted_tokens.pop_back()
if self.emit_token {
self.emit_token = false;
return self.current_token.take();
}
None
}

fn init_start_tag(&mut self) {
self.current_token = Some(FaviconToken::StartTag(StartTag::default()));
self.current_token = Some(FaviconToken {
tag: Tag::default(),
closing: false,
});
}

fn init_end_tag(&mut self) {
self.current_token = Some(FaviconToken::EndTag(EndTag::default()));
self.seen_attributes.clear();
self.current_token = Some(FaviconToken {
tag: Tag::default(),
closing: true,
});
}

fn emit_current_tag(&mut self) -> Option<html5gum::State> {
self.flush_current_attribute();
let mut token = self.current_token.take().unwrap();
let mut emit = false;
match token {
FaviconToken::EndTag(ref mut tag) => {
// Always clean seen attributes
self.seen_attributes.clear();
self.set_last_start_tag(None);

// Only trigger an emit for the </head> tag.
// This is matched, and will break the for-loop.
if *tag.name == b"head" {
emit = true;
}
}
FaviconToken::StartTag(ref mut tag) => {
// Only trriger an emit for <link> and <base> tags.
// These are the only tags we want to parse.
if *tag.name == b"link" || *tag.name == b"base" {
self.set_last_start_tag(Some(&tag.name));
emit = true;
} else {
self.set_last_start_tag(None);
}
}
}

// Only emit the tags we want to parse.
if emit {
self.emit_token(token);
self.flush_current_attribute(true);
self.last_start_tag.clear();
if self.current_token.is_some() && !self.current_token.as_ref().unwrap().closing {
self.last_start_tag.extend(&*self.current_token.as_ref().unwrap().tag.name);
}
None
html5gum::naive_next_state(&self.last_start_tag)
}

fn push_tag_name(&mut self, s: &[u8]) {
match self.current_token {
Some(
FaviconToken::StartTag(StartTag {
ref mut name,
..
})
| FaviconToken::EndTag(EndTag {
ref mut name,
..
}),
) => {
name.extend(s);
}
_ => debug_assert!(false),
if let Some(ref mut token) = self.current_token {
token.tag.name.extend(s);
}
}

fn init_attribute(&mut self) {
self.flush_current_attribute();
self.current_attribute = Some(Default::default());
self.flush_current_attribute(false);
self.current_attribute = match &self.current_token {
Some(token) => {
let tag_name: &[u8] = &token.tag.name;
match tag_name {
b"link" | b"head" | b"base" => Some(Default::default()),
_ => None,
}
}
_ => None,
};
}

fn push_attribute_name(&mut self, s: &[u8]) {
self.current_attribute.as_mut().unwrap().0.extend(s);
if let Some(attr) = &mut self.current_attribute {
attr.0.extend(s)
}
}

fn push_attribute_value(&mut self, s: &[u8]) {
self.current_attribute.as_mut().unwrap().1.extend(s);
if let Some(attr) = &mut self.current_attribute {
attr.1.extend(s)
}
}

fn current_is_appropriate_end_tag_token(&mut self) -> bool {
match self.current_token {
Some(FaviconToken::EndTag(ref tag)) => !self.last_start_tag.is_empty() && self.last_start_tag == tag.name,
match &self.current_token {
Some(token) if token.closing => !self.last_start_tag.is_empty() && self.last_start_tag == token.tag.name,
_ => false,
}
}
Expand Down

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