kemitix/manning-data-streaming-with-async-rust
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extract output_csv_line

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This commit is contained in:
Paul Campbell 2024-03-31 18:26:15 +01:00
parent 45841db4ed
commit 15d919e62c
1 changed files with 21 additions and 18 deletions
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27
src/main.rs
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@ -118,18 +118,7 @@ async fn fetch_closing_data(
}
}
#[async_std::main]
async fn main() -> std::io::Result<()> {
let opts = Opts::parse();
let from: DateTime<Utc> = opts.from.parse().expect("Couldn't parse 'from' date");
let to = Utc::now();
// a simple way to output a CSV header
println!("period start,symbol,price,change %,min,max,30d avg");
for symbol in opts.symbols.split(',') {
let closes = fetch_closing_data(&symbol, &from, &to).await?;
if !closes.is_empty() {
// min/max of the period. unwrap() because those are Option types
fn output_csv_line(closes: Vec<f64>, from: DateTime<Utc>, symbol: &str) {
let period_max: f64 = max(&closes).unwrap();
let period_min: f64 = min(&closes).unwrap();
let last_price = *closes.last().unwrap_or(&0.0);
@ -147,6 +136,20 @@ async fn main() -> std::io::Result<()> {
period_max,
sma.last().unwrap_or(&0.0)
);
}
#[async_std::main]
async fn main() -> std::io::Result<()> {
let opts = Opts::parse();
let from: DateTime<Utc> = opts.from.parse().expect("Couldn't parse 'from' date");
let to = Utc::now();
// a simple way to output a CSV header
println!("period start,symbol,price,change %,min,max,30d avg");
for symbol in opts.symbols.split(',') {
let closes = fetch_closing_data(&symbol, &from, &to).await?;
if !closes.is_empty() {
output_csv_line(closes, from, symbol);
}
}
Ok(())