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use crate::event::Event;
use crate::pipeline::EventParser;
use anyhow::Result;
use rhai::Dynamic;
pub struct LogfmtParser {
auto_timestamp: bool,
}
impl LogfmtParser {
pub fn new() -> Self {
Self {
auto_timestamp: true,
}
}
pub fn new_without_auto_timestamp() -> Self {
Self {
auto_timestamp: false,
}
}
/// Parse logfmt line: key1=value1 key2="value with spaces" key3=value3
/// Adapted from Stelp but converted to work with Kelora's Dynamic system
fn parse_logfmt_pairs(&self, line: &str) -> Result<Vec<(String, String)>, String> {
let mut pairs = Vec::new();
let mut chars = line.chars().peekable();
while chars.peek().is_some() {
// Skip whitespace
while chars.peek() == Some(&' ') || chars.peek() == Some(&'\t') {
chars.next();
}
if chars.peek().is_none() {
break;
}
// Parse key
let mut key = String::new();
while let Some(&ch) = chars.peek() {
if ch == '=' {
break;
} else if ch == ' ' || ch == '\t' {
return Err("Key cannot contain spaces".to_string());
} else {
key.push(chars.next().unwrap());
}
}
if key.is_empty() {
return Err("Empty key found".to_string());
}
// Expect '='
if chars.next() != Some('=') {
return Err(format!("Expected '=' after key '{}'", key));
}
// Parse value
let mut value = String::new();
if chars.peek() == Some(&'"') {
// Quoted value
chars.next(); // consume opening quote
while let Some(ch) = chars.next() {
if ch == '"' {
// Check for escaped quote
if chars.peek() == Some(&'"') {
chars.next(); // consume escaped quote
value.push('"');
} else {
break; // end of quoted value
}
} else if ch == '\\' {
// Handle escape sequences
if let Some(escaped_ch) = chars.next() {
match escaped_ch {
'n' => value.push('\n'),
't' => value.push('\t'),
'r' => value.push('\r'),
'\\' => value.push('\\'),
'"' => value.push('"'),
_ => {
value.push('\\');
value.push(escaped_ch);
}
}
}
} else {
value.push(ch);
}
}
} else {
// Unquoted value - read until space or end
while let Some(&ch) = chars.peek() {
if ch == ' ' || ch == '\t' {
break;
} else {
value.push(chars.next().unwrap());
}
}
}
pairs.push((key, value));
}
Ok(pairs)
}
/// Try to convert string to a numeric Dynamic value, falling back to string
fn parse_value_to_dynamic(&self, value: String) -> Dynamic {
// Try integer first
if let Ok(i) = value.parse::<i64>() {
return Dynamic::from(i);
}
// Try float
if let Ok(f) = value.parse::<f64>() {
return Dynamic::from(f);
}
// Try boolean
match value.to_lowercase().as_str() {
"true" => return Dynamic::from(true),
"false" => return Dynamic::from(false),
_ => {}
}
// Default to string
Dynamic::from(value)
}
}
impl EventParser for LogfmtParser {
fn parse(&self, line: &str) -> Result<Event> {
let line = line.trim_end_matches('\n').trim_end_matches('\r');
let pairs = self
.parse_logfmt_pairs(line.trim())
.map_err(|e| anyhow::anyhow!("{}", e))?;
// Pre-allocate Event with capacity based on number of pairs
let mut event = Event::with_capacity(line.to_string(), pairs.len());
for (key, value) in pairs {
// Convert string values to appropriate Dynamic types
let dynamic_value = self.parse_value_to_dynamic(value);
event.set_field(key, dynamic_value);
}
// Extract timestamp from the parsed data
if self.auto_timestamp {
event.extract_timestamp();
}
Ok(event)
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::pipeline::EventParser;
#[test]
fn test_logfmt_parser_basic() {
let parser = LogfmtParser::new();
let result =
EventParser::parse(&parser, r#"level=info message="test message" count=42"#).unwrap();
assert_eq!(
result
.fields
.get("level")
.unwrap()
.clone()
.into_string()
.unwrap(),
"info"
);
assert_eq!(
result
.fields
.get("message")
.unwrap()
.clone()
.into_string()
.unwrap(),
"test message"
);
assert!(result.fields.get("count").is_some());
assert_eq!(result.fields.get("count").unwrap().as_int().unwrap(), 42);
}
#[test]
fn test_logfmt_parser_types() {
let parser = LogfmtParser::new();
let result = EventParser::parse(
&parser,
r#"str="hello" int=123 float=2.5 bool_true=true bool_false=false"#,
)
.unwrap();
assert_eq!(
result
.fields
.get("str")
.unwrap()
.clone()
.into_string()
.unwrap(),
"hello"
);
assert_eq!(result.fields.get("int").unwrap().as_int().unwrap(), 123);
assert_eq!(result.fields.get("float").unwrap().as_float().unwrap(), 2.5);
assert!(result.fields.get("bool_true").unwrap().as_bool().unwrap());
assert!(!result.fields.get("bool_false").unwrap().as_bool().unwrap());
}
#[test]
fn test_logfmt_parser_quoted_values() {
let parser = LogfmtParser::new();
let result = EventParser::parse(
&parser,
r#"key1="value with spaces" key2="value with \"quotes\"" key3=simple"#,
)
.unwrap();
assert_eq!(
result
.fields
.get("key1")
.unwrap()
.clone()
.into_string()
.unwrap(),
"value with spaces"
);
assert_eq!(
result
.fields
.get("key2")
.unwrap()
.clone()
.into_string()
.unwrap(),
"value with \"quotes\""
);
assert_eq!(
result
.fields
.get("key3")
.unwrap()
.clone()
.into_string()
.unwrap(),
"simple"
);
}
#[test]
fn test_logfmt_parser_escape_sequences() {
let parser = LogfmtParser::new();
let result = EventParser::parse(
&parser,
r#"newline="line1\nline2" tab="col1\tcol2" backslash="back\\slash""#,
)
.unwrap();
assert_eq!(
result
.fields
.get("newline")
.unwrap()
.clone()
.into_string()
.unwrap(),
"line1\nline2"
);
assert_eq!(
result
.fields
.get("tab")
.unwrap()
.clone()
.into_string()
.unwrap(),
"col1\tcol2"
);
assert_eq!(
result
.fields
.get("backslash")
.unwrap()
.clone()
.into_string()
.unwrap(),
"back\\slash"
);
}
#[test]
fn test_logfmt_parser_empty_values() {
let parser = LogfmtParser::new();
let result =
EventParser::parse(&parser, r#"empty="" quoted_empty="" unquoted_value=value"#)
.unwrap();
assert_eq!(
result
.fields
.get("empty")
.unwrap()
.clone()
.into_string()
.unwrap(),
""
);
assert_eq!(
result
.fields
.get("quoted_empty")
.unwrap()
.clone()
.into_string()
.unwrap(),
""
);
assert_eq!(
result
.fields
.get("unquoted_value")
.unwrap()
.clone()
.into_string()
.unwrap(),
"value"
);
}
#[test]
fn test_logfmt_parser_core_fields() {
let parser = LogfmtParser::new();
let result = EventParser::parse(
&parser,
r#"timestamp=2023-01-01T12:00:00Z level=error message="Connection failed" user=alice"#,
)
.unwrap();
// Core fields should be accessible through fields map
assert_eq!(
result
.fields
.get("level")
.unwrap()
.clone()
.into_string()
.unwrap(),
"error"
);
assert_eq!(
result
.fields
.get("message")
.unwrap()
.clone()
.into_string()
.unwrap(),
"Connection failed"
);
assert!(result.parsed_ts.is_some());
// Other fields should be available
assert_eq!(
result
.fields
.get("user")
.unwrap()
.clone()
.into_string()
.unwrap(),
"alice"
);
}
#[test]
fn test_logfmt_parser_errors() {
let parser = LogfmtParser::new();
// Missing equals sign
assert!(EventParser::parse(&parser, "key value").is_err());
// Empty key
assert!(EventParser::parse(&parser, "=value").is_err());
// Key with spaces
assert!(EventParser::parse(&parser, "key with spaces=value").is_err());
}
}