pub fn new() -> Config {
        let matches = App::new(NAME)
            .version(VERSION)
            .author("Brian Martin <bmartin@twitter.com>")
            .about("high-resolution systems performance telemetry agent")
            .arg(
                Arg::with_name("listen")
                    .short("l")
                    .long("listen")
                    .required(true)
                    .takes_value(true)
                    .value_name("IP:PORT")
                    .help("Sets the listen address for metrics"),
            )
            .arg(
                Arg::with_name("verbose")
                    .short("v")
                    .long("verbose")
                    .multiple(true)
                    .help("Increase verbosity by one level. Can be used more than once"),
            )
            .arg(
                Arg::with_name("interval")
                    .long("interval")
                    .value_name("Seconds")
                    .help("Integration window duration and stats endpoint refresh time")
                    .takes_value(true),
            )
            .arg(
                Arg::with_name("sample-rate")
                    .long("sample-rate")
                    .value_name("Hertz")
                    .help("Sets the sampling frequency for the counters")
                    .takes_value(true),
            )
            .arg(
                Arg::with_name("sampler-timeout")
                    .long("sampler-timeout")
                    .value_name("MS")
                    .help("Sets the timeout for per-sampler execution")
                    .takes_value(true),
            )
            .arg(
                Arg::with_name("max-sampler-timeouts")
                    .long("max-sampler-timeouts")
                    .value_name("MS")
                    .help("Sets the maximum number of consecutive sampler timeouts")
                    .takes_value(true),
            )
            .arg(
                Arg::with_name("cpu")
                    .long("cpu")
                    .takes_value(true)
                    .multiple(true)
                    .possible_value("totals")
                    .help("Enable statistics from CPU subsystem"),
            )
            .arg(
                Arg::with_name("disk")
                    .long("disk")
                    .takes_value(true)
                    .multiple(true)
                    .possible_value("totals")
                    .help("Enable statistics from Disk subsystem"),
            )
            .arg(
                Arg::with_name("ebpf")
                    .long("ebpf")
                    .takes_value(true)
                    .multiple(true)
                    .possible_value("all")
                    .possible_value("block")
                    .possible_value("ext4")
                    .possible_value("scheduler")
                    .possible_value("xfs")
                    .help("Enable statistics from eBPF"),
            )
            .arg(
                Arg::with_name("network")
                    .long("network")
                    .takes_value(true)
                    .multiple(true)
                    .possible_value("totals")
                    .help("Enable statistics from Network subsystem"),
            )
            .arg(
                Arg::with_name("perf")
                    .long("perf")
                    .takes_value(true)
                    .multiple(true)
                    .possible_value("totals")
                    .possible_value("per-cgroup")
                    .help("Enable statistics from Perf Events subsystem"),
            )
            .arg(
                Arg::with_name("memcache")
                    .long("memcache")
                    .required(false)
                    .takes_value(true)
                    .value_name("IP:PORT")
                    .help("Connect to the given memcache server and produce stats"),
            )
            .arg(
                Arg::with_name("stats-log")
                    .long("stats-log")
                    .required(false)
                    .takes_value(true)
                    .value_name("LOG FILE")
                    .help("Enable logging of stats to file"),
            )
            .arg(
                Arg::with_name("sidecar")
                    .long("sidecar")
                    .required(false)
                    .help("Enables Mesos sidecar mode, instrumenting the container"),
            )
            .get_matches();

        let listen = matches
            .value_of("listen")
            .unwrap()
            .parse()
            .unwrap_or_else(|_| {
                println!("ERROR: listen address is malformed");
                process::exit(1);
            });

        let memcache = if let Some(sock) = matches.value_of("memcache") {
            let socket = sock.parse().unwrap_or_else(|_| {
                println!("ERROR: memcache address is malformed");
                process::exit(1);
            });
            Some(socket)
        } else {
            None
        };

        let sample_rate =
            parse_float_arg(&matches, "sample-rate").unwrap_or(DEFAULT_SAMPLE_RATE_HZ);
        let sampler_timeout = Duration::from_millis(
            parse_numeric_arg(&matches, "sampler-timeout")
                .unwrap_or(DEFAULT_SAMPLER_TIMEOUT_MILLISECONDS) as u64,
        );
        let max_sampler_timeouts = parse_numeric_arg(&matches, "max-sampler-timeouts")
            .unwrap_or(DEFAULT_MAX_SAMPLER_TIMEOUTS);
        let interval = parse_numeric_arg(&matches, "interval").unwrap_or(DEFAULT_INTERVAL_SECONDS)
            as u64
            * SECOND;
        let cores = hardware_threads().unwrap_or(1);

        let mut stats_enabled = Flags::new();
        for subsystem in &["cpu", "disk", "ebpf", "network", "perf"] {
            if let Some(values) = matches.values_of(subsystem) {
                let flags: Vec<&str> = values.collect();
                for flag in flags {
                    stats_enabled.insert(subsystem, flag);
                }
            }
        }

        let loglevel = match matches.occurrences_of("verbose") {
            0 => Level::Info,
            1 => Level::Debug,
            _ => Level::Trace,
        };

        let stats_log = matches
            .value_of("stats-log")
            .map(std::string::ToString::to_string);

        let sidecar = matches.is_present("sidecar");

        Config {
            cores,
            flags: stats_enabled,
            sample_rate,
            sampler_timeout,
            max_sampler_timeouts,
            interval,
            listen,
            loglevel,
            memcache,
            stats_log,
            sidecar,
        }
    }
/// parse command line options and return `Config`
parse command line options and return `Config`
parse command line options and return ` Config `
pub fn new() -> Config {
        let matches = App::new(NAME)
            .version(VERSION)
            .author("Brian Martin <bmartin@twitter.com>")
            .about("high-resolution systems performance telemetry agent")
            .arg(
                Arg::with_name("listen")
                    .short("l")
                    .long("listen")
                    .required(true)
                    .takes_value(true)
                    .value_name("IP:PORT")
                    .help("Sets the listen address for metrics"),
            )
            .arg(
                Arg::with_name("verbose")
                    .short("v")
                    .long("verbose")
                    .multiple(true)
                    .help("Increase verbosity by one level. Can be used more than once"),
            )
            .arg(
                Arg::with_name("interval")
                    .long("interval")
                    .value_name("Seconds")
                    .help("Integration window duration and stats endpoint refresh time")
                    .takes_value(true),
            )
            .arg(
                Arg::with_name("sample-rate")
                    .long("sample-rate")
                    .value_name("Hertz")
                    .help("Sets the sampling frequency for the counters")
                    .takes_value(true),
            )
            .arg(
                Arg::with_name("sampler-timeout")
                    .long("sampler-timeout")
                    .value_name("MS")
                    .help("Sets the timeout for per-sampler execution")
                    .takes_value(true),
            )
            .arg(
                Arg::with_name("max-sampler-timeouts")
                    .long("max-sampler-timeouts")
                    .value_name("MS")
                    .help("Sets the maximum number of consecutive sampler timeouts")
                    .takes_value(true),
            )
            .arg(
                Arg::with_name("cpu")
                    .long("cpu")
                    .takes_value(true)
                    .multiple(true)
                    .possible_value("totals")
                    .help("Enable statistics from CPU subsystem"),
            )
            .arg(
                Arg::with_name("disk")
                    .long("disk")
                    .takes_value(true)
                    .multiple(true)
                    .possible_value("totals")
                    .help("Enable statistics from Disk subsystem"),
            )
            .arg(
                Arg::with_name("ebpf")
                    .long("ebpf")
                    .takes_value(true)
                    .multiple(true)
                    .possible_value("all")
                    .possible_value("block")
                    .possible_value("ext4")
                    .possible_value("scheduler")
                    .possible_value("xfs")
                    .help("Enable statistics from eBPF"),
            )
            .arg(
                Arg::with_name("network")
                    .long("network")
                    .takes_value(true)
                    .multiple(true)
                    .possible_value("totals")
                    .help("Enable statistics from Network subsystem"),
            )
            .arg(
                Arg::with_name("perf")
                    .long("perf")
                    .takes_value(true)
                    .multiple(true)
                    .possible_value("totals")
                    .possible_value("per-cgroup")
                    .help("Enable statistics from Perf Events subsystem"),
            )
            .arg(
                Arg::with_name("memcache")
                    .long("memcache")
                    .required(false)
                    .takes_value(true)
                    .value_name("IP:PORT")
                    .help("Connect to the given memcache server and produce stats"),
            )
            .arg(
                Arg::with_name("stats-log")
                    .long("stats-log")
                    .required(false)
                    .takes_value(true)
                    .value_name("LOG FILE")
                    .help("Enable logging of stats to file"),
            )
            .arg(
                Arg::with_name("sidecar")
                    .long("sidecar")
                    .required(false)
                    .help("Enables Mesos sidecar mode, instrumenting the container"),
            )
            .get_matches();
        let listen = matches
            .value_of("listen")
            .unwrap()
            .parse()
            .unwrap_or_else(|_| {
                println!("ERROR: listen address is malformed");
                process::exit(1);
            });
        let memcache = if let Some(sock) = matches.value_of("memcache") {
            let socket = sock.parse().unwrap_or_else(|_| {
                println!("ERROR: memcache address is malformed");
                process::exit(1);
            });
            Some(socket)
        } else {
            None
        };
        let sample_rate =
            parse_float_arg(&matches, "sample-rate").unwrap_or(DEFAULT_SAMPLE_RATE_HZ);
        let sampler_timeout = Duration::from_millis(
            parse_numeric_arg(&matches, "sampler-timeout")
                .unwrap_or(DEFAULT_SAMPLER_TIMEOUT_MILLISECONDS) as u64,
        );
        let max_sampler_timeouts = parse_numeric_arg(&matches, "max-sampler-timeouts")
            .unwrap_or(DEFAULT_MAX_SAMPLER_TIMEOUTS);
        let interval = parse_numeric_arg(&matches, "interval").unwrap_or(DEFAULT_INTERVAL_SECONDS)
            as u64
            * SECOND;
        let cores = hardware_threads().unwrap_or(1);
        let mut stats_enabled = Flags::new();
        for subsystem in &["cpu", "disk", "ebpf", "network", "perf"] {
            if let Some(values) = matches.values_of(subsystem) {
                let flags: Vec<&str> = values.collect();
                for flag in flags {
                    stats_enabled.insert(subsystem, flag);
                }
            }
        }
        let loglevel = match matches.occurrences_of("verbose") {
            0 => Level::Info,
            1 => Level::Debug,
            _ => Level::Trace,
        };
        let stats_log = matches
            .value_of("stats-log")
            .map(std::string::ToString::to_string);
        let sidecar = matches.is_present("sidecar");
        Config {
            cores,
            flags: stats_enabled,
            sample_rate,
            sampler_timeout,
            max_sampler_timeouts,
            interval,
            listen,
            loglevel,
            memcache,
            stats_log,
            sidecar,
        }
    }
pub fn new ( ) -> Config { let matches = App :: new ( NAME ) . version ( VERSION ) . author ( " " ) . about ( " " ) . arg ( Arg :: with_name ( " " ) . short ( " " ) . long ( " " ) . required ( true ) . takes_value ( true ) . value_name ( " " ) . help ( " " ) , ) . arg ( Arg :: with_name ( " " ) . short ( " " ) . long ( " " ) . multiple ( true ) . help ( " " ) , ) . arg ( Arg :: with_name ( " " ) . long ( " " ) . value_name ( " " ) . help ( " " ) . takes_value ( true ) , ) . arg ( Arg :: with_name ( " " ) . long ( " " ) . value_name ( " " ) . help ( " " ) . takes_value ( true ) , ) . arg ( Arg :: with_name ( " " ) . long ( " " ) . value_name ( " " ) . help ( " " ) . takes_value ( true ) , ) . arg ( Arg :: with_name ( " " ) . long ( " " ) . value_name ( " " ) . help ( " " ) . takes_value ( true ) , ) . arg ( Arg :: with_name ( " " ) . long ( " " ) . takes_value ( true ) . multiple ( true ) . possible_value ( " " ) . help ( " " ) , ) . arg ( Arg :: with_name ( " " ) . long ( " " ) . takes_value ( true ) . multiple ( true ) . possible_value ( " " ) . help ( " " ) , ) . arg ( Arg :: with_name ( " " ) . long ( " " ) . takes_value ( true ) . multiple ( true ) . possible_value ( " " ) . possible_value ( " " ) . possible_value ( " " ) . possible_value ( " " ) . possible_value ( " " ) . help ( " " ) , ) . arg ( Arg :: with_name ( " " ) . long ( " " ) . takes_value ( true ) . multiple ( true ) . possible_value ( " " ) . help ( " " ) , ) . arg ( Arg :: with_name ( " " ) . long ( " " ) . takes_value ( true ) . multiple ( true ) . possible_value ( " " ) . possible_value ( " " ) . help ( " " ) , ) . arg ( Arg :: with_name ( " " ) . long ( " " ) . required ( false ) . takes_value ( true ) . value_name ( " " ) . help ( " " ) , ) . arg ( Arg :: with_name ( " " ) . long ( " " ) . required ( false ) . takes_value ( true ) . value_name ( " " ) . help ( " " ) , ) . arg ( Arg :: with_name ( " " ) . long ( " " ) . required ( false ) . help ( " " ) , ) . get_matches ( ) ; let listen = matches . value_of ( " " ) . unwrap ( ) . parse ( ) . unwrap_or_else ( | _ | { println ! ( " " ) ; process :: exit ( 1 ) ; } ) ; let memcache = if let Some ( sock ) = matches . value_of ( " " ) { let socket = sock . parse ( ) . unwrap_or_else ( | _ | { println ! ( " " ) ; process :: exit ( 1 ) ; } ) ; Some ( socket ) } else { None } ; let sample_rate = parse_float_arg ( & matches , " " ) . unwrap_or ( DEFAULT_SAMPLE_RATE_HZ ) ; let sampler_timeout = Duration :: from_millis ( parse_numeric_arg ( & matches , " " ) . unwrap_or ( DEFAULT_SAMPLER_TIMEOUT_MILLISECONDS ) as u64 , ) ; let max_sampler_timeouts = parse_numeric_arg ( & matches , " " ) . unwrap_or ( DEFAULT_MAX_SAMPLER_TIMEOUTS ) ; let interval = parse_numeric_arg ( & matches , " " ) . unwrap_or ( DEFAULT_INTERVAL_SECONDS ) as u64 * SECOND ; let cores = hardware_threads ( ) . unwrap_or ( 1 ) ; let mut stats_enabled = Flags :: new ( ) ; for subsystem in & [ " " , " " , " " , " " , " " ] { if let Some ( values ) = matches . values_of ( subsystem ) { let flags : Vec < & str > = values . collect ( ) ; for flag in flags { stats_enabled . insert ( subsystem , flag ) ; } } } let loglevel = match matches . occurrences_of ( " " ) { 0 => Level :: Info , 1 => Level :: Debug , _ => Level :: Trace , } ; let stats_log = matches . value_of ( " " ) . map ( std :: string :: ToString :: to_string ) ; let sidecar = matches . is_present ( " " ) ; Config { cores , flags : stats_enabled , sample_rate , sampler_timeout , max_sampler_timeouts , interval , listen , loglevel , memcache , stats_log , sidecar , } }
parse command line options and return `Config`
parse command line options and return ` Config `