From 9f13ce193933671dbbb5bd84d74df5104872c800 Mon Sep 17 00:00:00 2001 From: Syfaro Date: Tue, 27 Jul 2021 22:25:53 -0400 Subject: [PATCH] Initial commit. --- .gitignore | 1 + .gitlab-ci.yml | 37 + Cargo.lock | 2717 ++++++++++++++++++++++++++++++++++++++++++++ Cargo.toml | 37 + Dockerfile | 4 + README.md | 10 + src/main.rs | 328 ++++++ src/middlewares.rs | 139 +++ 8 files changed, 3273 insertions(+) create mode 100644 .gitignore create mode 100644 .gitlab-ci.yml create mode 100644 Cargo.lock create mode 100644 Cargo.toml create mode 100644 Dockerfile create mode 100644 README.md create mode 100644 src/main.rs create mode 100644 src/middlewares.rs diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..ea8c4bf --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +/target diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml new file mode 100644 index 0000000..936a05e --- /dev/null +++ b/.gitlab-ci.yml @@ -0,0 +1,37 @@ +stages: + - build + - image + +variables: + CARGO_HOME: 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index 0000000..8e68498 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,37 @@ +[package] +name = "bkapi" +version = "0.1.0" +authors = ["Syfaro "] +edition = "2018" + +[dependencies] +envconfig = "0.10" +thiserror = "1" + +tracing = "0.1" +tracing-subscriber = "0.2" +tracing-unwrap = "0.9" +tracing-opentelemetry = "0.14" + +opentelemetry = { version = "0.15", features = ["rt-async-std"] } +opentelemetry-semantic-conventions = "0.7.0" +opentelemetry-jaeger = "0.14" + +lazy_static = "1" +prometheus = { version = "0.12", features = ["process"] } + +bk-tree = "0.4.0" +hamming = "0.1" + +futures = "0.3" +async-std = { version = "1", features = ["attributes"] } + +serde = { version = "1", features = ["derive"] } +serde_json = "1" + +tide = "0.16" +tide-tracing = "0.0.11" + +[dependencies.sqlx] +version = "0.5" +features = ["runtime-async-std-native-tls", "postgres"] diff --git a/Dockerfile b/Dockerfile new file mode 100644 index 0000000..46e0e9d --- /dev/null +++ b/Dockerfile @@ -0,0 +1,4 @@ +FROM debian:buster-slim +EXPOSE 3000 +COPY ./bkapi /bin/bkapi +CMD ["/bin/bkapi"] diff --git a/README.md b/README.md new file mode 100644 index 0000000..6c684cd --- /dev/null +++ b/README.md @@ -0,0 +1,10 @@ +# bkapi + +A fast way to look up hamming distance hashes. + +It operates by connecting to a PostgreSQL database (`DATABASE_URL`), selecting +every column of a provided query (`DATABASE_QUERY`), subscribing to events +(`DATABASE_SUBSCRIBE`), and holding everything in a BK tree. + +It provides a single API endpoint, `/search` which takes in a `hash` and +`distance` query parameter to search for matches. diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..a247756 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,328 @@ +use std::sync::Arc; + +use async_std::sync::{RwLock, RwLockUpgradableReadGuard}; +use envconfig::Envconfig; +use opentelemetry::KeyValue; +use sqlx::{ + postgres::{PgListener, PgPoolOptions}, + Pool, Postgres, Row, +}; +use tide::Request; +use tracing_subscriber::layer::SubscriberExt; +use tracing_unwrap::ResultExt; + +mod middlewares; + +lazy_static::lazy_static! { + static ref HTTP_REQUEST_COUNT: prometheus::CounterVec = prometheus::register_counter_vec!("http_requests_total", "Number of HTTP requests", &["http_route", "http_method", "http_status_code"]).unwrap(); + static ref HTTP_REQUEST_DURATION: prometheus::HistogramVec = prometheus::register_histogram_vec!("http_request_duration_seconds", "Duration of HTTP requests", &["http_route", "http_method", "http_status_code"]).unwrap(); + + static ref TREE_DURATION: prometheus::HistogramVec = prometheus::register_histogram_vec!("bkapi_tree_duration_seconds", "Duration of tree search time", &["distance"]).unwrap(); +} + +#[derive(thiserror::Error, Debug)] +enum Error { + #[error("row was unable to be loaded: {0}")] + LoadingRow(sqlx::Error), + #[error("listener could not listen: {0}")] + Listener(sqlx::Error), + #[error("listener got data that could not be decoded: {0}")] + Data(serde_json::Error), +} + +type Tree = Arc>>; + +#[derive(Envconfig, Clone)] +struct Config { + #[envconfig(default = "0.0.0.0:3000")] + http_listen: String, + #[envconfig(default = "127.0.0.1:6831")] + jaeger_agent: String, + #[envconfig(default = "bkapi")] + service_name: String, + + database_url: String, + database_query: String, + database_subscribe: String, + #[envconfig(default = "false")] + database_is_unique: bool, + + max_distance: Option, +} + +/// A hamming distance metric. +struct Hamming; + +impl bk_tree::Metric for Hamming { + fn distance(&self, a: &Node, b: &Node) -> u32 { + hamming::distance_fast(&a.0, &b.0).expect_or_log("hashes did not have same byte alignment") + as u32 + } + + fn threshold_distance(&self, a: &Node, b: &Node, _threshold: u32) -> Option { + Some(self.distance(a, b)) + } +} + +/// A value of a node in the BK tree. +#[derive(Debug, Clone, Copy, PartialEq, Eq)] +struct Node([u8; 8]); + +impl From for Node { + fn from(num: i64) -> Self { + Self(num.to_be_bytes()) + } +} + +impl From for i64 { + fn from(node: Node) -> Self { + i64::from_be_bytes(node.0) + } +} + +#[async_std::main] +async fn main() { + let config = Config::init_from_env().expect("could not load config"); + + opentelemetry::global::set_text_map_propagator(opentelemetry_jaeger::Propagator::new()); + + let env = std::env::var("ENVIRONMENT"); + let env = if let Ok(env) = env.as_ref() { + env.as_str() + } else if cfg!(debug_assertions) { + "debug" + } else { + "release" + }; + + let tracer = opentelemetry_jaeger::new_pipeline() + .with_agent_endpoint(&config.jaeger_agent) + .with_service_name(&config.service_name) + .with_tags(vec![ + KeyValue::new("environment", env.to_owned()), + KeyValue::new("version", env!("CARGO_PKG_VERSION")), + ]) + .install_batch(opentelemetry::runtime::AsyncStd) + .expect("otel jaeger pipeline could not be created"); + + let trace = tracing_opentelemetry::layer().with_tracer(tracer.clone()); + tracing::subscriber::set_global_default( + tracing_subscriber::Registry::default() + .with(tracing_subscriber::EnvFilter::from_default_env()) + .with(trace) + .with(tracing_subscriber::fmt::layer()), + ) + .expect("tracing could not be configured"); + + tracing::info!("starting bkbase"); + + tracing::debug!("loaded config"); + + let tree: Tree = Arc::new(RwLock::new(bk_tree::BKTree::new(Hamming))); + + let pool = PgPoolOptions::new() + .max_connections(2) + .connect(&config.database_url) + .await + .expect_or_log("could not connect to database"); + tracing::debug!("connected to postgres"); + + let http_listen = config.http_listen.clone(); + let max_distance = config.max_distance; + + let (sender, receiver) = futures::channel::oneshot::channel(); + + tracing::info!("starting to listen for payloads"); + let tree_clone = tree.clone(); + async_std::task::spawn(async { + listen_for_payloads(pool, config, tree_clone, sender) + .await + .expect_or_log("listenting for updates failed"); + }); + + tracing::info!("waiting for initial tree to load"); + receiver + .await + .expect_or_log("tree loading was dropped before completing"); + tracing::info!("initial tree loaded, starting server"); + + let mut app = tide::with_state(State { tree, max_distance }); + app.with(middlewares::TideOpentelemMiddleware::new(tracer)); + app.with(tide_tracing::TraceMiddleware::new()); + app.with(middlewares::TidePrometheusMiddleware); + + app.at("/search").get(search); + app.listen(&http_listen) + .await + .expect_or_log("could not start web server"); +} + +#[derive(Clone)] +struct State { + tree: Tree, + max_distance: Option, +} + +#[derive(serde::Deserialize)] +struct Query { + hash: i64, + distance: u32, +} + +#[derive(serde::Serialize)] +struct HashDistance { + hash: i64, + distance: u32, +} + +#[derive(serde::Serialize)] +struct SearchResponse { + hash: i64, + distance: u32, + + hashes: Vec, +} + +#[tracing::instrument(skip(req))] +async fn search(req: Request) -> tide::Result { + let state = req.state(); + + let Query { hash, distance } = req.query()?; + tracing::info!("searching for hash {} with distance {}", hash, distance); + + if matches!(state.max_distance, Some(max_distance) if distance > max_distance) { + return Err(tide::Error::from_str( + 400, + "Distance is greater than max distance", + )); + } + + let tree = state.tree.read().await; + + let duration = TREE_DURATION + .with_label_values(&[&distance.to_string()]) + .start_timer(); + let matches: Vec = tree + .find(&hash.into(), distance) + .into_iter() + .map(|item| HashDistance { + distance: item.0, + hash: (*item.1).into(), + }) + .collect(); + let time = duration.stop_and_record(); + + tracing::debug!("found {} items in {} seconds", matches.len(), time); + + let resp = SearchResponse { + hash, + distance, + hashes: matches, + }; + + Ok(serde_json::to_string(&resp)?.into()) +} + +/// Create a new BK tree and pull in all hashes from provided query. +/// +/// This must be called after you have started a listener, otherwise items may +/// be lost. +async fn create_tree( + conn: &Pool, + config: &Config, +) -> Result, Error> { + use futures::TryStreamExt; + + tracing::warn!("creating new tree"); + + let mut tree = bk_tree::BKTree::new(Hamming); + + let mut rows = sqlx::query(&config.database_query).fetch(conn); + + let mut count = 0; + + let start = std::time::Instant::now(); + + while let Some(row) = rows.try_next().await.map_err(Error::LoadingRow)? { + let node: Node = row.get::(0).into(); + + // Avoid checking if each value is unique if we were told that the + // database query only returns unique values. + if config.database_is_unique || tree.find_exact(&node).is_none() { + tree.add(node); + } + + count += 1; + if count % 250_000 == 0 { + tracing::debug!(count, "loaded more rows"); + } + } + + let dur = std::time::Instant::now().duration_since(start); + + tracing::info!(count, "completed loading rows in {:?}", dur); + + Ok(tree) +} + +#[derive(serde::Deserialize)] +struct Payload { + hash: i64, +} + +/// Listen for incoming payloads. +/// +/// This will create a new tree to ensure all items are present. It will also +/// automatically recreate trees as needed if the database connection is lost. +async fn listen_for_payloads( + conn: Pool, + config: Config, + tree: Tree, + initial: futures::channel::oneshot::Sender<()>, +) -> Result<(), Error> { + let mut listener = PgListener::connect_with(&conn) + .await + .map_err(Error::Listener)?; + listener + .listen(&config.database_subscribe) + .await + .map_err(Error::Listener)?; + + let new_tree = create_tree(&conn, &config).await?; + { + let mut tree = tree.write().await; + *tree = new_tree; + } + + initial + .send(()) + .expect_or_log("nothing listening for initial data"); + + loop { + while let Some(notification) = listener.try_recv().await.map_err(Error::Listener)? { + let payload: Payload = + serde_json::from_str(notification.payload()).map_err(Error::Data)?; + tracing::debug!(hash = payload.hash, "evaluating new payload"); + + let node: Node = payload.hash.into(); + + let tree = tree.upgradable_read().await; + if tree.find_exact(&node).is_some() { + tracing::trace!("hash already existed in tree"); + continue; + } + + tracing::trace!("hash did not exist, adding to tree"); + let mut tree = RwLockUpgradableReadGuard::upgrade(tree).await; + tree.add(node); + } + + tracing::error!("disconnected from listener, recreating tree"); + async_std::task::sleep(std::time::Duration::from_secs(10)).await; + let new_tree = create_tree(&conn, &config).await?; + { + let mut tree = tree.write().await; + *tree = new_tree; + } + } +} diff --git a/src/middlewares.rs b/src/middlewares.rs new file mode 100644 index 0000000..2c96181 --- /dev/null +++ b/src/middlewares.rs @@ -0,0 +1,139 @@ +use std::collections::HashMap; +use std::convert::TryFrom; + +use opentelemetry::{ + global::get_text_map_propagator, + trace::{FutureExt, Span, SpanKind, TraceContextExt, Tracer}, + Context, +}; +use opentelemetry_semantic_conventions::trace; +use prometheus::{Encoder, TextEncoder}; +use tide::{ + http::{ + headers::{HeaderName, HeaderValue}, + mime, + }, + Middleware, Request, Response, +}; + +pub struct TidePrometheusMiddleware; + +impl TidePrometheusMiddleware { + const ROUTE: &'static str = "/metrics"; +} + +#[tide::utils::async_trait] +impl Middleware for TidePrometheusMiddleware { + async fn handle(&self, req: Request, next: tide::Next<'_, State>) -> tide::Result { + let path = req.url().path().to_owned(); + + if path == Self::ROUTE { + let mut buffer = Vec::new(); + let encoder = TextEncoder::new(); + + let metric_families = prometheus::gather(); + encoder.encode(&metric_families, &mut buffer).unwrap(); + + return Ok(Response::builder(200) + .body(buffer) + .content_type(mime::PLAIN) + .build()); + } + + let method = req.method().to_string(); + + let start = std::time::Instant::now(); + let res = next.run(req).await; + let end = std::time::Instant::now().duration_since(start); + + let status_code = res.status().to_string(); + + let labels: Vec<&str> = vec![&path, &method, &status_code]; + + crate::HTTP_REQUEST_COUNT.with_label_values(&labels).inc(); + crate::HTTP_REQUEST_DURATION + .with_label_values(&labels) + .observe(end.as_secs_f64()); + + Ok(res) + } +} + +pub struct TideOpentelemMiddleware { + tracer: T, +} + +impl TideOpentelemMiddleware { + pub fn new(tracer: T) -> Self { + Self { tracer } + } +} + +#[tide::utils::async_trait] +impl Middleware + for TideOpentelemMiddleware +{ + async fn handle(&self, req: Request, next: tide::Next<'_, State>) -> tide::Result { + let parent_cx = get_parent_cx(&req); + + let method = req.method().to_string(); + let url = req.url(); + + let attributes = vec![ + trace::HTTP_METHOD.string(method.clone()), + trace::HTTP_SCHEME.string(url.scheme().to_string()), + trace::HTTP_URL.string(url.to_string()), + ]; + + let mut span_builder = self + .tracer + .span_builder(format!("{} {}", method, url.path())) + .with_kind(SpanKind::Server) + .with_attributes(attributes); + + if parent_cx.span().span_context().is_remote() { + tracing::trace!("incoming request has remote span: {:?}", parent_cx); + span_builder = span_builder.with_parent_context(parent_cx); + } + + let mut span = span_builder.start(&self.tracer); + span.add_event("request.started".to_owned(), vec![]); + let cx = &Context::current_with_span(span); + + let mut res = next.run(req).with_context(cx.clone()).await; + + let span = cx.span(); + span.add_event("request.completed".to_owned(), vec![]); + span.set_attribute(trace::HTTP_STATUS_CODE.i64(u16::from(res.status()).into())); + + if let Some(len) = res.len().and_then(|len| i64::try_from(len).ok()) { + span.set_attribute(trace::HTTP_RESPONSE_CONTENT_LENGTH.i64(len)); + } + + let mut injector = HashMap::new(); + get_text_map_propagator(|propagator| propagator.inject_context(&cx, &mut injector)); + + for (key, value) in injector { + let header_name = HeaderName::from_bytes(key.into_bytes()); + let header_value = HeaderValue::from_bytes(value.into_bytes()); + + if let (Ok(name), Ok(value)) = (header_name, header_value) { + res.insert_header(name, value); + } else { + tracing::error!("injected header data was invalid"); + } + } + + Ok(res) + } +} + +fn get_parent_cx(req: &Request) -> Context { + let mut req_headers = HashMap::new(); + + for (key, value) in req.iter() { + req_headers.insert(key.to_string(), value.last().to_string()); + } + + get_text_map_propagator(|propagator| propagator.extract(&req_headers)) +}