You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: similarity.rs
    path of file: ./repos/spyglass/crates/spyglass-searcher/src
    
    the code of the file until where you have to start completion: use reqwest::Client;
use serde::{Deserialize, Serialize};
use shared::response::SimilaritySearchResult;
use std::env;
use std::time::SystemTime;

use super::client::Searcher;
use crate::SearchTrait;

const EMBEDDING_ENDPOINT: &str = "SIMILARITY_SEARCH_ENDPOINT";
const EMBEDDING_PORT: &str = "SIMILARITY_SEARCH_PORT";
const DEFAULT_HOST: &str = "localhost";
const DEFAULT_PORT: &str = "8000";

#[derive(Deserialize, Serialize)]
struct SimilarityContext {
    content: String,
    document: String,
}

#[derive(De
    
pub async fn similarity_search(query: &str) -> Vec<SimilaritySearchResult> {
    let bench_start = SystemTime::now();
    let endpoint = env::var(EMBEDDING_ENDPOINT).unwrap_or(DEFAULT_HOST.into());
    let port = env::var(EMBEDDING_PORT).unwrap_or(DEFAULT_PORT.into());
    log::info!("using {}:{}", endpoint, port);
    log::info!(
        "env_check: {}ms",
        bench_start.elapsed().unwrap().as_millis()
    );

    // search vector db, todo: if enabled/available
    let bench_start = SystemTime::now();
    let client = reqwest::Client::builder().build().unwrap();
    log::info!(
        "client_build: {}ms",
        bench_start.elapsed().unwrap().as_millis()
    );

    // todo: pull endpoint from environment / configuration
    let bench_start = SystemTime::now();
    let resp = client
        .post(format!("http://{}:{}/search", endpoint, port))
        .json(&serde_json::json!({ "query": query }))
        .send()
        .await
        .unwrap();
    log::info!(
        "similarity_search_call: {}ms",
        bench_start.elapsed().unwrap().as_millis()
    );

    let bench_start = SystemTime::now();
    let results = resp.json().await.unwrap_or_default();
    log::info!(
        "similarity_json: {}ms",
        bench_start.elapsed().unwrap().as_millis()
    );

    results
}