def from_header_str()

in aws_xray_sdk/core/models/trace_header.py [0:0]

• 23 lines of code
• 6 McCabe index (conditional complexity)

    def from_header_str(cls, header):
        """
        Create a TraceHeader object from a tracing header string
        extracted from a http request headers.
        """
        if not header:
            return cls()

        try:
            params = header.strip().split(HEADER_DELIMITER)
            header_dict = {}
            data = {}

            for param in params:
                entry = param.split('=')
                key = entry[0]
                if key in (ROOT, PARENT, SAMPLE):
                    header_dict[key] = entry[1]
                # Ignore any "Self=" trace ids injected from ALB.
                elif key != SELF:
                    data[key] = entry[1]

            return cls(
                root=header_dict.get(ROOT, None),
                parent=header_dict.get(PARENT, None),
                sampled=header_dict.get(SAMPLE, None),
                data=data,
            )

        except Exception:
            log.warning("malformed tracing header %s, ignore.", header)
            return cls()