Remove influxDB support for profile

It's apparently unused. Influent is unmaintained. Let's remove it

Cargo.lock

@@ -2631,21 +2631,6 @@ dependencies = [
  "adler32",
 ]
 
-[[package]]
-name = "influent"
-version = "0.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "87fdeaaa9b5aacb83901de1bb66b32ec574a327758657404c1edf06f5a6ac0f0"
-dependencies = [
- "base64 0.10.1",
- "futures",
- "http",
- "hyper",
- "tokio",
- "tokio-executor",
- "url",
-]
-
 [[package]]
 name = "io-surface"
 version = "0.12.1"
@@ -4133,7 +4118,6 @@ name = "profile"
 version = "0.0.1"
 dependencies = [
  "heartbeats-simple",
- "influent",
  "ipc-channel",
  "libc",
  "log",

components/config/opts.rs

@@ -37,8 +37,6 @@ pub struct Opts {
     ///    (`i.e. -p 5`).
     ///  - a file path to write profiling info to a TSV file upon Servo's termination.
     ///    (`i.e. -p out.tsv`).
-    ///  - an InfluxDB hostname to store profiling info upon Servo's termination.
-    ///    (`i.e. -p http://localhost:8086`)
     pub time_profiling: Option<OutputOptions>,
 
     /// When the profiler is enabled, this is an optional path to dump a self-contained HTML file
@@ -452,7 +450,6 @@ fn print_debug_usage(app: &str) -> ! {
 #[derive(Clone, Debug, Deserialize, Serialize)]
 pub enum OutputOptions {
     /// Database connection config (hostname, name, user, pass)
-    DB(ServoUrl, Option<String>, Option<String>, Option<String>),
     FileName(String),
     Stdout(f64),
 }
@@ -743,12 +740,7 @@ pub fn from_cmdline_args(mut opts: Options, args: &[String]) -> ArgumentParsingR
             Some(argument) => match argument.parse::<f64>() {
                 Ok(interval) => Some(OutputOptions::Stdout(interval)),
                 Err(_) => match ServoUrl::parse(&argument) {
-                    Ok(url) => Some(OutputOptions::DB(
-                        url,
-                        opt_match.opt_str("profiler-db-name"),
-                        opt_match.opt_str("profiler-db-user"),
-                        opt_match.opt_str("profiler-db-pass"),
-                    )),
+                    Ok(_) => panic!("influxDB isn't supported anymore"),
                     Err(_) => Some(OutputOptions::FileName(argument)),
                 },
             },

components/profile/Cargo.toml

@@ -12,7 +12,6 @@ path = "lib.rs"
 
 [dependencies]
 profile_traits = {path = "../profile_traits"}
-influent = "0.5"
 ipc-channel = "0.14"
 heartbeats-simple = "0.4"
 log = "0.4"

components/profile/time.rs

@@ -6,9 +6,6 @@
 
 use crate::heartbeats;
 use crate::trace_dump::TraceDump;
-use influent::client::{Client, Credentials};
-use influent::create_client;
-use influent::measurement::{Measurement, Value};
 use ipc_channel::ipc::{self, IpcReceiver};
 use profile_traits::energy::{energy_interval_ms, read_energy_uj};
 use profile_traits::time::{
@@ -25,7 +22,6 @@ use std::path::Path;
 use std::time::Duration;
 use std::{f64, thread, u32, u64};
 use time_crate::precise_time_ns;
-use tokio::prelude::Future;
 
 pub trait Formattable {
     fn format(&self, output: &Option<OutputOptions>) -> String;
@@ -197,9 +193,7 @@ impl Profiler {
                     .expect("Thread spawning failed");
                 // decide if we need to spawn the timer thread
                 match option {
-                    &OutputOptions::FileName(_) | &OutputOptions::DB(_, _, _, _) => {
-                        /* no timer thread needed */
-                    },
+                    &OutputOptions::FileName(_) => { /* no timer thread needed */ },
                     &OutputOptions::Stdout(period) => {
                         // Spawn a timer thread
                         let chan = chan.clone();
@@ -475,47 +469,6 @@ impl Profiler {
                 }
                 writeln!(&mut lock, "").unwrap();
             },
-            Some(OutputOptions::DB(ref hostname, ref dbname, ref user, ref password)) => {
-                // Unfortunately, influent does not like hostnames ending with "/"
-                let mut hostname = hostname.to_string();
-                if hostname.ends_with("/") {
-                    hostname.pop();
-                }
-
-                let empty = String::from("");
-                let username = user.as_ref().unwrap_or(&empty);
-                let password = password.as_ref().unwrap_or(&empty);
-                let database = dbname.as_ref().unwrap_or(&empty);
-                let credentials = Credentials {
-                    username: username,
-                    password: password,
-                    database: database,
-                };
-
-                let hosts = vec![hostname.as_str()];
-                let client = create_client(credentials, hosts);
-
-                for (&(ref category, ref meta), ref mut data) in &mut self.buckets {
-                    data.sort_by(|a, b| a.partial_cmp(b).expect("No NaN values in profiles"));
-                    let data_len = data.len();
-                    if data_len > 0 {
-                        let (mean, median, min, max) = Self::get_statistics(data);
-                        let category = category.format(&self.output);
-                        let mut measurement = Measurement::new(&category);
-                        measurement.add_field("mean", Value::Float(mean));
-                        measurement.add_field("median", Value::Float(median));
-                        measurement.add_field("min", Value::Float(min));
-                        measurement.add_field("max", Value::Float(max));
-                        if let Some(ref meta) = *meta {
-                            measurement.add_tag("host", meta.url.as_str());
-                        };
-
-                        tokio::run(client.write_one(measurement, None).map_err(|e| {
-                            warn!("Could not write measurement to profiler db: {:?}", e)
-                        }));
-                    }
-                }
-            },
             None => { /* Do nothing if no output option has been set */ },
         };
     }