error.stdout

/Users/xlange/.cargo/bin/cargo test --color=always -- --nocapture
   Compiling whaletail v0.1.0 (file:///Users/xlange/IdeaProjects/whale-tail)
warning: unused import: `test::Bencher`
  --> src/lib.rs:22:9
   |
22 |     use test::Bencher;
   |         ^^^^^^^^^^^^^
   |
   = note: #[warn(unused_imports)] on by default

    Finished dev [unoptimized + debuginfo] target(s) in 1.46 secs
     Running target/debug/deps/whaletail-f5fadca46f2fa91d

running 1 test
"{\"log\":\"SABnzbd settings\\n\",\"stream\":\"stdout\",\"time\":\"2017-04-26T15:48:36.126328492Z\"}"
thread 'tests::parse_file' panicked at 'called `Result::unwrap()` on an `Err` value: ErrorImpl { code: Message("invalid type: string \"SABnzbd settings\\n\", expected a borrowed string"), line: 1, column: 27 }', src/libcore/result.rs:859
stack backtrace:
   0:        0x1001cbc43 - std::sys::imp::backtrace::tracing::imp::unwind_backtrace::h34a7b169ac42b490
   1:        0x1001cda54 - std::panicking::default_hook::{{closure}}::hcc7f46907143dca1
   2:        0x1001cd66c - std::panicking::default_hook::h9cd165f254d86e53
   3:        0x1001cff97 - std::panicking::rust_panic_with_hook::h2bd2f0b446f0face
   4:        0x1001cfe34 - std::panicking::begin_panic::h1732f61ecaaa434e
   5:        0x1001cfda2 - std::panicking::begin_panic_fmt::h2948dd4668f99175
   6:        0x1001cfd07 - rust_begin_unwind
   7:        0x1001f54f0 - core::panicking::panic_fmt::hb2e726f3b579b19d
   8:        0x100159ea3 - core::result::unwrap_failed::h8af30d3fc4d97514
   9:        0x100156cce - <core::result::Result<T, E>>::unwrap::h68e0322a7978c96c
  10:        0x1001604c7 - whaletail::tests::parse_file::h4936cf8b56e62286
  11:        0x1001715cb - <F as test::FnBox<T>>::call_box::hde864e0f2ebe212b
  12:        0x1001d10aa - __rust_maybe_catch_panic
  13:        0x1001640f1 - std::panicking::try::do_call::h450ec71bdec47c60
  14:        0x1001d10aa - __rust_maybe_catch_panic
  15:        0x10016be74 - <F as alloc::boxed::FnBox<A>>::call_box::h70bc89ffeca4ac62
  16:        0x1001cd065 - std::sys::imp::thread::Thread::new::thread_start::h5852519f9f48a1f2
  17:     0x7fffc96e69ae - _pthread_body
  18:     0x7fffc96e68fa - _pthread_start
test tests::parse_file ... FAILED

failures:

failures:
    tests::parse_file

test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured

error: test failed, to rerun pass '--lib'

Process finished with exit code 101

lib.rs

#![feature(test)]
extern crate test;

extern crate serde;
extern crate serde_json;

#[macro_use]
extern crate serde_derive;

extern crate chrono;
use chrono::{DateTime, UTC};

#[derive(Deserialize,Serialize)]
pub struct DockerLogLine<'a> {
    pub log: &'a str,
    pub stream: String,
    pub time: DateTime<UTC>
}

#[cfg(test)]
mod tests {
    use test::Bencher;
    use super::*;

//    #[test]
//    fn parse_one() {
//        let sample = r#"{
//            "log":"time=\"2017-05-02T15:56:35Z\" level=info msg=\"PurgeUploads starting: olderThan=2017-04-25 15:56:35.846514213 +0000 UTC, actuallyDelete=true\" \n",
//            "stream":"stdout",
//            "time":"2017-05-02T15:56:35.846897572Z"
//        }"#;
//
//        let _: DockerLogLine = serde_json::from_str(sample).unwrap();
//    }
//
//    #[test]
//    fn parse_many() {
//        let sample = r#"{"log":"time=\"2017-05-02T15:56:35Z\" level=info msg=\"PurgeUploads starting: olderThan=2017-04-25 15:56:35.846514213 +0000 UTC, actuallyDelete=true\" \n","stream":"stdout","time":"2017-05-02T15:56:35.846897572Z"}
//    {"log":"time=\"2017-05-02T15:56:35Z\" level=info msg=\"Purge uploads finished.  Num deleted=0, num errors=0\" \n","stream":"stdout","time":"2017-05-02T15:56:35.849976968Z"}
//    {"log":"time=\"2017-05-02T15:56:35Z\" level=info msg=\"Starting upload purge in 24h0m0s\" go.version=go1.7.3 instance.id=e930db88-e8b8-47b0-ade1-20183a3167b4 version=v2.6.0 \n","stream":"stdout","time":"2017-05-02T15:56:35.850005422Z"}"#;
//
//        use std::io::{BufRead, BufReader, Cursor};
//        let sample_buf = BufReader::new(Cursor::new(sample));
//
//        for sample in sample_buf.lines() {
//            let _: DockerLogLine = serde_json::from_str(&sample.unwrap()).unwrap();
//        }
//    }

    #[test]
    fn parse_file(/* b: &mut Bencher */) {
        use std::fs::{ File };
        use std::io::{ Seek, SeekFrom };

        let mut f = File::open("/Users/xlange/30ece7c43b7c302f43e54ac9f299ca36efb8184375eac0563c9340a15100ee3c-json.log").unwrap();

//        b.iter(|| {
            {
                use std::io::{BufRead, BufReader};
                let buf_f = BufReader::new(&f);
                for sample in buf_f.lines() {
                    let line = sample.unwrap();
                    println!("{:?}", &line[..]);
                    let _: DockerLogLine = serde_json::from_str(&line[..]).unwrap();
                }
            }
            f.seek(SeekFrom::Start(0)).unwrap();
//        })
    }
}

sample.log

$ cat ~/30ece7c43b7c302f43e54ac9f299ca36efb8184375eac0563c9340a15100ee3c-json.log
{"log":"SABnzbd settings\n","stream":"stdout","time":"2017-04-26T15:48:36.126328492Z"}
{"log":"================\n","stream":"stdout","time":"2017-04-26T15:48:36.12638681Z"}
{"log":"\n","stream":"stdout","time":"2017-04-26T15:48:36.126394484Z"}
{"log":"  User:       sabnzbd\n","stream":"stdout","time":"2017-04-26T15:48:36.12639905Z"}
{"log":"  UID:        666\n","stream":"stdout","time":"2017-04-26T15:48:36.126403697Z"}