commit d2cf1f0ce5e97636d2c875b9092715fff8ae8bc8
Author: Earlopain <earlopain@protonmail.com>
Date:   Wed Apr 5 12:43:13 2023 +0200

    Initial import

diff --git a/.env.sample b/.env.sample
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index 0000000..8c478d9
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diff --git a/.gitignore b/.gitignore
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index 0000000..76b565e
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+ "lazy_static",
+ "log",
+ "proc-macro2",
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+[[package]]
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+[[package]]
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+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
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+[[package]]
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+[[package]]
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+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"
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+[[package]]
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+checksum = "b2986deb581c4fe11b621998a5e53361efe6b48a151178d0cd9eeffa4dc6acc9"
+dependencies = [
+ "winapi 0.3.9",
+]
+
+[[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 = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "56c1936c4cc7a1c9ab21a1ebb602eb942ba868cbd44a99cb7cdc5892335e1c85"
+dependencies = [
+ "linked-hash-map 0.5.4",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..dd0c62e
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "autocompleted"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+actix-web = "3"
+moka = { version = "0.6.1", features = ["future"] }
+config = "0.10.1"
+deadpool-postgres = "0.5.0"
+derive_more = "0.99.2"
+dotenv = "0.15.0"
+serde = { version = "1.0.104", features = ["derive"] }
+serde_json = "1.0"
+tokio-pg-mapper = "0.1"
+tokio-pg-mapper-derive = "0.1"
+tokio-postgres = "0.5.1"
+unicode-normalization = "0.1.19"
+log = "0.4"
+env_logger = "0.9.0"
diff --git a/sql/fetch_tags_a.sql b/sql/fetch_tags_a.sql
new file mode 100644
index 0000000..859fe50
--- /dev/null
+++ b/sql/fetch_tags_a.sql
@@ -0,0 +1,8 @@
+SELECT DISTINCT ON (name, post_count) * FROM (
+(SELECT tags.id, tags.name, tags.post_count, tags.category, null AS antecedent_name FROM
+"tags" WHERE (tags.name LIKE $1 ESCAPE E'\\') AND (post_count > 0) ORDER BY post_count desc LIMIT 10)
+UNION ALL
+(SELECT tags.id, tags.name, tags.post_count, tags.category, tag_aliases.antecedent_name
+FROM "tag_aliases"
+INNER JOIN tags ON tags.name = tag_aliases.consequent_name
+WHERE (tag_aliases.antecedent_name LIKE $1 ESCAPE E'\\') AND "tag_aliases"."status" IN ('active', 'processing', 'queued') AND (tags.name NOT LIKE $1 ESCAPE E'\\') AND (tag_aliases.post_count > 0) ORDER BY tag_aliases.post_count desc LIMIT 20)) AS unioned_query ORDER BY post_count desc LIMIT 10
diff --git a/sql/fetch_tags_b.sql b/sql/fetch_tags_b.sql
new file mode 100644
index 0000000..e5b7210
--- /dev/null
+++ b/sql/fetch_tags_b.sql
@@ -0,0 +1 @@
+SELECT tags.id, tags.name, tags.post_count, tags.category, null AS antecedent_name FROM "tags" WHERE (tags.name % $1) AND (tags.post_count > 0) ORDER BY trunc(3 * similarity(name, $1)) DESC, post_count DESC, name DESC LIMIT 10
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..bdd1a43
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,186 @@
+use actix_web::{dev::HttpResponseBuilder, error, get, http::header, http::StatusCode, HttpResponse, web};
+use deadpool_postgres::Pool;
+use derive_more::{Display, Error, From};
+use moka::future::Cache;
+use log::error;
+use serde::Deserialize;
+
+mod config {
+    pub use ::config::ConfigError;
+    use serde::Deserialize;
+
+    #[derive(Deserialize)]
+    pub struct Config {
+        pub server_addr: String,
+        pub pg: deadpool_postgres::Config,
+    }
+
+    impl Config {
+        pub fn from_env() -> Result<Self, ConfigError> {
+            let mut cfg = ::config::Config::new();
+            cfg.merge(::config::Environment::new())?;
+            cfg.try_into()
+        }
+    }
+}
+
+mod models {
+    use serde::{Deserialize, Serialize};
+    use tokio_pg_mapper_derive::PostgresMapper;
+
+    #[derive(Deserialize, PostgresMapper, Serialize)]
+    #[pg_mapper(table = "tags")] // singular 'user' is a keyword..
+    pub struct Tag {
+        pub id: i32,
+        pub name: String,
+        pub post_count: i32,
+        pub category: i16,
+        pub antecedent_name: Option<String>,
+    }
+}
+
+mod db {
+    use deadpool_postgres::Client;
+    use tokio_pg_mapper::FromTokioPostgresRow;
+
+    use crate::models::Tag;
+
+    fn escape_like(stuff: &String) -> String {
+        stuff.replace("%", "\\%").replace("_", "\\_").replace("*", "%").replace("\\*", "*")
+    }
+
+    pub async fn get_tags(client: &Client, tag_prefix: &String) -> Result<Vec<Tag>, tokio_postgres::Error> {
+        let escape_prefix = escape_like(&(tag_prefix.to_owned() + "*"));
+        let _stmt = "set statement_timeout = 3000";
+        let stmt = client.prepare(&_stmt).await?;
+        client.execute(&stmt, &[]).await?;
+        let _stmt = include_str!("../sql/fetch_tags_a.sql");
+        let stmt = client.prepare(&_stmt).await?;
+        let rows = client.query(&stmt, &[&escape_prefix])
+            .await?.iter()
+            .map(|row| Tag::from_row_ref(row).unwrap())
+            .collect::<Vec<Tag>>();
+        if rows.len() > 0 {
+            return Ok(rows);
+        }
+        let _stmt = include_str!("../sql/fetch_tags_b.sql");
+        let stmt = client.prepare(&_stmt).await?;
+        let rows = client.query(&stmt, &[&tag_prefix])
+            .await?.iter()
+            .map(|row| Tag::from_row_ref(row).unwrap())
+            .collect::<Vec<Tag>>();
+        Ok(rows)
+    }
+}
+
+struct AutocompleteState {
+    pool: Pool,
+    cache: Cache<String, String>,
+}
+
+#[derive(Debug, Display, Error, From)]
+enum AutocompleteError {
+    #[display(fmt = "bad request")]
+    BadRequest,
+    #[display(fmt = "internal error")]
+    ServerError,
+}
+
+impl error::ResponseError for AutocompleteError {
+    fn error_response(&self) -> HttpResponse {
+        match *self {
+            AutocompleteError::BadRequest => HttpResponseBuilder::new(self.status_code())
+                .set_header(header::CONTENT_TYPE, "application/json; charset=utf-8")
+                .set_header(header::CACHE_CONTROL, "private; max-age=0").body("{\"error\":\"bad request\"}"),
+            AutocompleteError::ServerError => HttpResponseBuilder::new(self.status_code())
+                .set_header(header::CONTENT_TYPE, "application/json; charset=utf-8")
+                .set_header(header::CACHE_CONTROL, "private; max-age=0").body("{\"error\":\"internal error\"}")
+        }
+    }
+
+    fn status_code(&self) -> StatusCode {
+        match *self {
+            AutocompleteError::BadRequest => StatusCode::BAD_REQUEST,
+            AutocompleteError::ServerError => StatusCode::INTERNAL_SERVER_ERROR
+        }
+    }
+}
+
+fn validate_transform_tag(tag: &str) -> Result<String, AutocompleteError> {
+    use unicode_normalization::UnicodeNormalization;
+    if tag.len() > 100 {
+        return Err(AutocompleteError::BadRequest);
+    }
+    if tag.len() < 3 {
+        return Err(AutocompleteError::BadRequest);
+    }
+    let tag_str = tag.nfc().collect::<String>().to_lowercase().replace("*", "").replace("%", "").chars().filter(|x| !x.is_whitespace()).collect();
+    Ok(tag_str)
+}
+
+#[derive(Deserialize)]
+struct Req {
+  #[serde(rename(deserialize = "search[name_matches]"))]
+  tag_prefix: String
+}
+
+#[get("/")]
+async fn autocomplete(data: web::Data<AutocompleteState>, req: web::Query<Req>) -> Result<HttpResponse, AutocompleteError> {
+    let prefix: String = validate_transform_tag(req.tag_prefix.as_str())?;
+    let cached = data.cache.get(&prefix);
+    return if cached.is_some() {
+        Ok(HttpResponse::Ok()
+            .set_header(header::CONTENT_TYPE, "application/json; charset=utf-8")
+            .set_header(header::CACHE_CONTROL, "public; max-age=604800")
+            .body(cached.unwrap()))
+    } else {
+        let client = match data.pool.get().await {
+            Ok(x) => x,
+            Err(x) => {
+                error!("{}", x.to_string());
+                return Err(AutocompleteError::ServerError);
+            }
+        };
+        let results = match db::get_tags(&client, &prefix).await {
+            Ok(x) => x,
+            Err(x) => {
+                error!("{}", x.to_string());
+                return Err(AutocompleteError::ServerError);
+            }
+        };
+        let serialized = serde_json::to_string(&results).unwrap_or_else(|_| "[]".to_string());
+        let serialized_copy = serialized.clone();
+        data.cache.insert(prefix, serialized).await;
+        Ok(HttpResponse::Ok()
+            .set_header(header::CONTENT_TYPE, "application/json; charset=utf-8")
+            .set_header(header::CACHE_CONTROL, "public, max-age=604800")
+            .body(serialized_copy))
+    };
+}
+
+#[actix_web::main]
+async fn main() -> std::io::Result<()> {
+    use actix_web::{App, HttpServer};
+    use dotenv::dotenv;
+    use tokio_postgres::NoTls;
+    use moka::future::CacheBuilder;
+    use std::time::Duration;
+    dotenv().ok();
+    env_logger::init();
+
+    let config = crate::config::Config::from_env().unwrap();
+    let pool = config.pg.create_pool(NoTls).unwrap();
+    let cache = CacheBuilder::new(15_000)
+        .time_to_live(Duration::from_secs(6 * 60 * 60))
+        .build();
+
+    HttpServer::new(move || {
+        App::new()
+            .data(AutocompleteState {
+                pool: pool.clone(),
+                cache: cache.clone(),
+            })
+            .service(autocomplete)
+    }).bind(config.server_addr.clone())?
+        .run().await
+}