bench.rs

#![feature(test)]

extern crate serde;
extern crate test;
#[macro_use]
extern crate serde_derive;
extern crate serde_json;

use serde_json::{RawValue, Value};
use test::Bencher;

const DOC: &str = r#"{
  "_id": "srijs",
  "_rev": "1-1841dec358ff29eca8c42a52f1c2a1d0",
  "value": {
      "first_name": "Sam",
      "last_name": "Rijs",
      "display_name": "Sammy",
      "password_version": 3,
      "password_salt": "be887ed005be8456ada9",
      "password_hash": "004b9f8ebb49d4db0f619cc799b67a154e15bb9b",
      "signup": 1488499210429,
      "last_login": 1536833933821,
      "referral_source": "google",
      "language_preference": "en-AU"
  }
}"#;

#[derive(Deserialize)]
struct DatabaseDocument<T> {
    #[serde(rename = "_id")]
    id: String,
    #[serde(rename = "_rev")]
    rev: String,
    value: T,
}

#[derive(Serialize)]
struct ApiResponseBody<T> {
    data: T,
}

#[bench]
fn deserialize_and_serialize_value(b: &mut Bencher) {
    b.iter(|| {
        let doc_json = test::black_box(DOC);
        let db_doc = serde_json::from_str::<DatabaseDocument<Value>>(doc_json).unwrap();
        serde_json::to_string(&ApiResponseBody { data: db_doc.value }).unwrap()
    });
}

#[bench]
fn deserialize_and_serialize_raw_value(b: &mut Bencher) {
    b.iter(|| {
        let doc_json = test::black_box(DOC);
        let db_doc = serde_json::from_str::<DatabaseDocument<RawValue>>(doc_json).unwrap();
        serde_json::to_string(&ApiResponseBody { data: db_doc.value }).unwrap()
    });
}