ArĝentakatoA
Deno•2y ago•
5 replies
Arĝentakato

Logger Structure args

I am implementing a simple access log in Deno Fresh, but I am not quite sure how to use the standard library Logger.

I want to record logs with remote host etc. at the beginning of the sentence like nginx logs, but can I specify the type of log argument?

Currently, the implementation is as follows:
log.setup({
    handlers: {
        accsessLoggerFmt: new log.ConsoleHandler("INFO", {
          formatter: (record) => {
          const { datetime, levelName, msg, args } = record;

          const d = new Date(datetime.getTime() - datetime.getTimezoneOffset() * 6e4);
          const logTime = d.toISOString().slice(0, -5) + d.toString().replace(/^.*GMT([-+]\d{2})(\d{2}).*$/, "$1:$2");

          let log = `${logTime} ${levelName.padEnd(7)}`;

          for (const arg of args) {
              log += ` ${arg}`;
          }

          log += ` ${msg}`;

          return log;
      }),
    },
    loggers: {
        accessLogger: {
            level: "INFO",
            handlers: ["accsessLoggerFmt"],
        },
    },
});

const requestId = ...
const ip = ...

logger.info("Something", requestId, ip);


A current implementation requires inserting the remote host or other information to be displayed in the argument each time, which we believe is tedious and prone to errors.

I have read the documentation but could not come up with a good solution. Any advice would be appreciated.
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