Add parsers: JSON, Syslog, Apache, and factory

loglens/parsers/apache_parser.py

@@ -0,0 +1,234 @@
+"""Apache/Nginx log parser."""
+
+import re
+from datetime import datetime
+from typing import Any, Dict, List, Match, Optional
+from urllib.parse import parse_qs, unquote
+
+from loglens.parsers.base import LogParser, ParsedLogEntry
+
+
+class ApacheParser(LogParser):
+    """Parser for Apache and Nginx access/error logs."""
+
+    format_name = "apache"
+
+    APACHE_COMMON_PATTERN = re.compile(
+        r'^(?P<ip>\S+)\s+\S+\s+\S+\s+\[(?P<timestamp>.*?)\]\s+"(?P<request>.*?)"\s+(?P<status>\d{3})\s+(?P<size>\S+)'
+    )
+
+    APACHE_COMBINED_PATTERN = re.compile(
+        r'^(?P<ip>\S+)\s+\S+\s+\S+\s+\[(?P<timestamp>.*?)\]\s+"(?P<request>.*?)"\s+(?P<status>\d{3})\s+(?P<size>\S+)\s+"(?P<referer>.*?)"\s+"(?P<user_agent>.*?)"'
+    )
+
+    NGINX_PATTERN = re.compile(
+        r'^(?P<ip>\S+)\s+-\s+\S+\s+\[(?P<timestamp>.*?)\]\s+"(?P<method>\S+)\s+(?P<path>.*?)\s+(?P<protocol>\S+)"\s+(?P<status>\d{3})\s+(?P<size>\S+)\s+"(?P<referer>.*?)"\s+"(?P<user_agent>.*?)"\s+"(?P<request_time>.*?)"'
+    )
+
+    ERROR_PATTERN = re.compile(
+        r'^\[[A-Z][a-z]{2}\s+[A-Z][a-z]{2}\s+\d{1,2}\s+\d{2}:\d{2}:\d{2}(?:\.\d+)?\s+\d{4})\]\s+\[([^\]:]+):([^\]]+)\]\s+(?:\[pid\s+(\d+)\]\s+)?(?P<message>.*)$'
+    )
+
+    STATUS_CODES = {
+        "1xx": "informational",
+        "2xx": "success",
+        "3xx": "redirection",
+        "4xx": "client_error",
+        "5xx": "server_error"
+    }
+
+    def __init__(self, custom_format: Optional[str] = None):
+        self.custom_format = custom_format
+        self._compile_custom_pattern(custom_format)
+
+    def _compile_custom_pattern(self, format_str: Optional[str]) -> None:
+        """Compile custom log format pattern."""
+        if not format_str:
+            self.custom_pattern = None
+            return
+
+        pattern_str = format_str.replace("%h", r"(?P<ip>\S+)") \
+                               .replace("%l", r"\S+") \
+                               .replace("%u", r"\S+") \
+                               .replace("%t", r"\[(?P<timestamp>.*?)\]") \
+                               .replace("%r", r'"(?P<method>\S+)\s+(?P<path>.*?)\s+(?P<protocol>\S+)"') \
+                               .replace("%s", r"(?P<status>\d{3})") \
+                               .replace("%b", r"(?P<size>\S+)") \
+                               .replace("%{Referer}i", r'"(?P<referer>.*?)"') \
+                               .replace("%{User-agent}i", r'"(?P<user_agent>.*?)"')
+
+        try:
+            self.custom_pattern = re.compile("^" + pattern_str)
+        except re.error:
+            self.custom_pattern = None
+
+    def can_parse(self, line: str) -> bool:
+        """Check if line matches Apache/Nginx format."""
+        line = line.strip()
+        if not line:
+            return False
+
+        if self.APACHE_COMBINED_PATTERN.match(line):
+            return True
+        if self.APACHE_COMMON_PATTERN.match(line):
+            return True
+        if self.NGINX_PATTERN.match(line):
+            return True
+        if self.ERROR_PATTERN.match(line):
+            return True
+        if self.custom_pattern and self.custom_pattern.match(line):
+            return True
+
+        return False
+
+    def parse(self, line: str, line_number: int = 0) -> Optional[ParsedLogEntry]:
+        """Parse an Apache/Nginx log line."""
+        line = line.strip()
+        if not line:
+            return None
+
+        entry = ParsedLogEntry(
+            raw_line=line,
+            line_number=line_number
+        )
+
+        parsed = None
+
+        if self.custom_pattern:
+            match = self.custom_pattern.match(line)
+            if match:
+                parsed = self._extract_from_match(match, line)
+
+        if not parsed:
+            match = self.NGINX_PATTERN.match(line)
+            if match:
+                parsed = self._extract_from_match(match, line)
+
+        if not parsed:
+            match = self.APACHE_COMBINED_PATTERN.match(line)
+            if match:
+                parsed = self._extract_from_match(match, line)
+
+        if not parsed:
+            match = self.APACHE_COMMON_PATTERN.match(line)
+            if match:
+                parsed = self._extract_from_match(match, line)
+
+        if not parsed:
+            match = self.ERROR_PATTERN.match(line)
+            if match:
+                parsed = self._extract_error_from_match(match, line)
+
+        if parsed:
+            entry.timestamp = parsed.get("timestamp")
+            entry.host = parsed.get("ip")
+            entry.level = parsed.get("level")
+            entry.message = parsed.get("message", "")
+            entry.extra = parsed.get("extra", {})
+
+        return entry
+
+    def _extract_from_match(self, match: Match, line: str) -> Dict[str, Any]:
+        """Extract data from regex match."""
+        result = {}
+
+        groups = match.groupdict()
+
+        if "ip" in groups:
+            result["ip"] = groups["ip"]
+
+        if "timestamp" in groups:
+            ts = groups["timestamp"]
+            result["timestamp"] = self._parse_timestamp(ts)
+
+        if "request" in groups:
+            request = groups["request"]
+            request_match = re.match(r'(?P<method>\S+)\s+(?P<path>.*)', request)
+            if request_match:
+                result["method"] = request_match.group("method")
+                result["path"] = request_match.group("path")
+                result["message"] = f"{request_match.group('method')} {request_match.group('path')}"
+            else:
+                result["message"] = request
+
+        if "status" in groups:
+            status = groups["status"]
+            result["level"] = self._infer_level_from_status(status)
+            result["extra"] = {}
+
+        if "size" in groups and groups["size"] != "-":
+            result["extra"] = result.get("extra", {})
+            try:
+                result["extra"]["response_size"] = int(groups["size"])
+            except ValueError:
+                result["extra"]["response_size"] = groups["size"]
+
+        if "referer" in groups and groups["referer"] != "-":
+            result["extra"]["referer"] = groups["referer"]
+
+        if "user_agent" in groups and groups["user_agent"] != "-":
+            result["extra"]["user_agent"] = groups["user_agent"]
+
+        if "request_time" in groups:
+            result["extra"]["request_time"] = groups["request_time"]
+
+        return result
+
+    def _extract_error_from_match(self, match: Match, line: str) -> Dict[str, Any]:
+        """Extract data from error log match."""
+        groups = match.groupdict()
+
+        result = {
+            "message": groups.get("message", ""),
+        }
+
+        if len(match.groups()) >= 3:
+            result["level"] = match.group(3).lower() if match.group(3) else "info"
+            if match.group(2):
+                result["extra"] = {"module": match.group(2)}
+
+        if groups.get("timestamp"):
+            result["timestamp"] = self._parse_timestamp(groups["timestamp"])
+
+        return result
+
+    def _parse_timestamp(self, ts: str) -> Optional[datetime]:
+        """Parse Apache/Nginx timestamp format."""
+        ts = ts.strip()
+
+        formats = [
+            "%d/%b/%Y:%H:%M:%S %z",
+            "%d/%b/%Y:%H:%M:%S",
+            "%Y-%m-%dT%H:%M:%S%z",
+            "%Y-%m-%d %H:%M:%S",
+        ]
+
+        for fmt in formats:
+            try:
+                return datetime.strptime(ts, fmt)
+            except ValueError:
+                continue
+
+        return None
+
+    def _infer_level_from_status(self, status: str) -> Optional[str]:
+        """Infer log level from HTTP status code."""
+        if not status:
+            return None
+
+        try:
+            code = int(status)
+            if 100 <= code < 200:
+                return "info"
+            elif 200 <= code < 300:
+                return "info"
+            elif 300 <= code < 400:
+                return "info"
+            elif 400 <= code < 500:
+                return "warning"
+            elif 500 <= code < 600:
+                return "error"
+        except ValueError:
+            pass
+
+        return None