CSV Support for ATSC

atsc/Cargo.toml

@@ -22,6 +22,8 @@ wavbrro = { path = "../wavbrro" }
 splines = "4.3.0"
 inverse_distance_weight = "0.1.1"
 num-traits = "0.2"
+csv = "1.3.1"
+thiserror = "2.0.3"
 
 [dev-dependencies]
 criterion = "0.5.1"
@@ -33,4 +35,4 @@ harness= false
 
 [[bench]]
 name = "polynomial_bench"
-harness= false
+harness= false

atsc/src/csv.rs

@@ -0,0 +1,252 @@
+use std::fs::{File, OpenOptions};
+use std::path::Path;
+
+#[derive(Debug, thiserror::Error)]
+pub enum Error {
+    #[error("Failed to open csv file")]
+    OpenFileFailed,
+
+    #[error("Timestamp filed is not found")]
+    TimestampFieldNotFound,
+
+    #[error("Value field is not found")]
+    ValueFieldNotFound,
+
+    #[error("Parsing timestamp is failed")]
+    ParsingTimestampFailed,
+
+    #[error("Parsing value is failed")]
+    ParsingValueFailed,
+
+    #[error("Unexpected error occurred")]
+    Unexpected,
+}
+
+type Result<T> = std::result::Result<T, Error>;
+
+#[derive(Debug, PartialEq)]
+pub struct Sample {
+    pub timestamp: i64,
+    pub value: f64,
+}
+
+/// read_samples_with_headers reads samples from the given file.
+/// It expects that timestamps are stored under timestamp_field field header
+/// and values are stored under value_field.
+pub fn read_samples_with_headers(
+    filepath: &Path,
+    timestamp_field: &str,
+    value_field: &str,
+) -> Result<Vec<Sample>> {
+    let mut reader = open_csv_reader(filepath, true)?;
+    let headers = reader.headers().map_err(|_| Error::Unexpected)?;
+
+    // Find the index of the timestamp and value fields
+    let _ = headers
+        .iter()
+        .position(|h| h == timestamp_field)
+        .ok_or(Error::TimestampFieldNotFound)?;
+
+    let value_idx = headers
+        .iter()
+        .position(|h| h == value_field)
+        .ok_or(Error::ValueFieldNotFound)?;
+
+    // Collect samples
+    let mut samples = Vec::new();
+    for record in reader.records() {
+        let record = record.unwrap();
+        // let timestamp: DateTime<Utc> = record.get(timestamp_idx).unwrap().parse()?;
+        let value: f64 = record
+            .get(value_idx)
+            .unwrap()
+            .parse()
+            .map_err(|_| Error::ParsingValueFailed)?;
+
+        samples.push(Sample {
+            timestamp: 0,
+            value,
+        });
+    }
+
+    Ok(samples)
+}
+
+/// read_samples reads samples from the given file.
+/// It assumes that file contains no headers and
+/// consists of only a single field with values.
+pub fn read_samples(filepath: &Path) -> Result<Vec<Sample>> {
+    let mut reader = open_csv_reader(filepath, false)?;
+
+    // Collect samples
+    let mut samples = Vec::new();
+    for record in reader.records() {
+        let record = record.unwrap();
+        let value: f64 = record
+            .get(0) // assuming that there is only a single field with values inside
+            .unwrap()
+            .parse()
+            .map_err(|_| Error::ParsingValueFailed)?;
+
+        samples.push(Sample {
+            timestamp: 0,
+            value,
+        });
+    }
+
+    Ok(samples)
+}
+
+fn open_csv_reader(filepath: &Path, has_headers: bool) -> Result<csv::Reader<File>> {
+    let file = OpenOptions::new()
+        .read(true)
+        .open(filepath)
+        .map_err(|_| Error::OpenFileFailed)?;
+
+    let reader = csv::ReaderBuilder::new()
+        .has_headers(has_headers)
+        .from_reader(file);
+    Ok(reader)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::fs::File;
+    use std::io::Write;
+    use std::path::Path;
+    use tempfile::tempdir;
+
+    fn create_csv_file(content: &str, filepath: &Path) {
+        let mut file = File::create(filepath).expect("Failed to create test CSV file");
+        file.write_all(content.as_bytes())
+            .expect("Failed to write to test CSV file");
+    }
+
+    #[test]
+    fn test_valid_csv() {
+        let temp_dir = tempdir().unwrap();
+        let filepath = temp_dir.into_path().join("test_valid.csv");
+
+        let content = "timestamp,value\n1625097600,123.45\n1625184000,678.90\n";
+        create_csv_file(content, &filepath);
+
+        let result = read_samples_with_headers(&filepath, "timestamp", "value");
+        assert!(result.is_ok());
+
+        let samples = result.unwrap();
+        assert_eq!(
+            samples,
+            vec![
+                Sample {
+                    timestamp: 0,
+                    value: 123.45
+                },
+                Sample {
+                    timestamp: 0,
+                    value: 678.90
+                },
+            ]
+        );
+    }
+
+    #[test]
+    fn test_single_column_csv_no_headers() {
+        let temp_dir = tempdir().unwrap();
+        let filepath = temp_dir.into_path().join("test_single_column.csv");
+
+        let content = "123.45\n678.90\n";
+        create_csv_file(content, &filepath);
+
+        let result = read_samples(&filepath);
+        assert!(result.is_ok());
+
+        let samples = result.unwrap();
+        assert_eq!(
+            samples,
+            vec![
+                Sample {
+                    timestamp: 0,
+                    value: 123.45
+                },
+                Sample {
+                    timestamp: 0,
+                    value: 678.90
+                },
+            ]
+        );
+    }
+
+    #[test]
+    fn test_incorrect_format_single_column() {
+        let temp_dir = tempdir().unwrap();
+        let filepath = temp_dir.into_path().join("test_incorrect_format.csv");
+
+        let content = "value\n123.45\ninvalid_value\n678.90\n";
+        create_csv_file(content, &filepath);
+
+        let result = read_samples(&filepath);
+        assert!(matches!(result, Err(Error::ParsingValueFailed)));
+    }
+
+    #[test]
+    fn test_missing_timestamp_column() {
+        let temp_dir = tempdir().unwrap();
+        let filepath = temp_dir
+            .into_path()
+            .join("test_missing_timestamp_column.csv");
+
+        let content = "time,value\n1625097600,123.45\n1625184000,678.90\n";
+        create_csv_file(content, &filepath);
+
+        let result = read_samples_with_headers(&filepath, "timestamp", "value");
+        assert!(matches!(result, Err(Error::TimestampFieldNotFound)));
+    }
+
+    #[test]
+    fn test_missing_value_column() {
+        let temp_dir = tempdir().unwrap();
+        let filepath = temp_dir.into_path().join("test_missing_value_column.csv");
+
+        let content = "timestamp,price\n1625097600,123.45\n1625184000,678.90\n";
+        create_csv_file(content, &filepath);
+
+        let result = read_samples_with_headers(&filepath, "timestamp", "value");
+        assert!(matches!(result, Err(Error::ValueFieldNotFound)));
+    }
+
+    #[test]
+    fn test_parsing_error_value() {
+        let temp_dir = tempdir().unwrap();
+        let filepath = temp_dir.into_path().join("test_parsing_error_value.csv");
+
+        let content = "timestamp,value\n1625097600,invalid_value\n1625184000,678.90\n";
+        create_csv_file(content, &filepath);
+
+        let result = read_samples_with_headers(&filepath, "timestamp", "value");
+        assert!(matches!(result, Err(Error::ParsingValueFailed)));
+    }
+
+    #[test]
+    fn test_unopenable_file() {
+        let filepath = Path::new("/invalid/path/to/non_existent_file.csv");
+
+        let result = read_samples_with_headers(filepath, "timestamp", "value");
+        assert!(matches!(result, Err(Error::OpenFileFailed)));
+
+        let result = read_samples(filepath);
+        assert!(matches!(result, Err(Error::OpenFileFailed)));
+    }
+
+    #[test]
+    fn test_no_headers_csv() {
+        let temp_dir = tempdir().unwrap();
+        let filepath = temp_dir.into_path().join("test_no_headers.csv");
+
+        let content = "timestamp,value\n1625097600,123.45\n1625184000,678.90\n";
+        create_csv_file(content, &filepath);
+
+        let result = read_samples(&filepath);
+        assert!(matches!(result, Err(Error::ParsingValueFailed)));
+    }
+}

atsc/src/lib.rs

@@ -17,11 +17,13 @@ limitations under the License.
 #![allow(clippy::new_without_default)]
 // TODO: re-enable dead code checks
 #![allow(dead_code)]
+extern crate core;
 
 pub mod compressor;
 pub mod data;
 pub mod frame;
 pub mod header;
 pub mod utils;
 
+pub mod csv;
 pub mod optimizer;