103 lines
4.1 KiB
JavaScript
103 lines
4.1 KiB
JavaScript
import Logger from "./lib/logger.ts";
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const logger = new Logger({ level: "debug" });
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logger.error("Unable to fetch student");
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logger.info("Hello from logger");
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logger.warn("This is a warning");
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logger.debug("This is a debug message"); // This won't be logged if level is set to 'info'
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logger.level("error");
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logger.debug("This is a debug message"); // This won't be logged if level is set to 'info' or higher
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const simple_logger = new Logger({ level: "debug", format: "simple" });
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simple_logger.error("Unable to fetch student");
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simple_logger.info("Hello from logger");
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simple_logger.warn("This is a warning");
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simple_logger.debug("This is a debug message"); // This won't be logged if level is set to 'info'
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simple_logger.level("error");
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simple_logger.debug("This is a debug message"); // This won't be logged if level is set to 'info' or higher
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const longLogger = new Logger({ time: "long", format: "simple" });
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const shortLogger = new Logger({ time: "short", format: "simple" });
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longLogger.info("This uses long time format");
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shortLogger.info("This uses short time format");
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// Demonstrate callerLevel functionality
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console.log("\n=== Caller Level Demo ===");
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// Default callerLevel is 'warn' - only errors and warnings include caller info
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const defaultCallerLogger = new Logger({ format: "simple" });
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console.log(
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"Default callerLevel (warn) - only errors and warnings show caller info:",
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);
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defaultCallerLogger.error("Error with caller info");
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defaultCallerLogger.warn("Warning with caller info");
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defaultCallerLogger.info("Info without caller info");
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defaultCallerLogger.debug("Debug without caller info");
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// Set callerLevel to 'error' - only errors include caller info
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const errorOnlyLogger = new Logger({ format: "simple", callerLevel: "error" });
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console.log("\nCallerLevel set to error - only errors show caller info:");
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errorOnlyLogger.error("Error with caller info");
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errorOnlyLogger.warn("Warning without caller info");
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errorOnlyLogger.info("Info without caller info");
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// Set callerLevel to 'debug' - all levels include caller info
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const allLevelsLogger = new Logger({ format: "simple", callerLevel: "debug" });
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console.log("\nCallerLevel set to debug - all levels show caller info:");
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allLevelsLogger.error("Error with caller info");
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allLevelsLogger.warn("Warning with caller info");
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allLevelsLogger.info("Info with caller info");
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allLevelsLogger.debug("Debug with caller info");
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// Set callerLevel to 'silent' - no levels include caller info
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const noneLogger = new Logger({ format: "simple", callerLevel: "silent" });
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console.log("\nCallerLevel set to silent - no levels show caller info:");
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noneLogger.error("Error without caller info");
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noneLogger.warn("Warning without caller info");
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noneLogger.info("Info without caller info");
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// Demonstrate format string functionality (util.format style)
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console.log("\n=== Format String Demo ===");
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const formatLogger = new Logger({ format: "simple", level: "debug" });
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console.log("Format strings with various specifiers:");
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// String formatting (%s)
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formatLogger.info("User %s logged in successfully", "john_doe");
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// Number formatting (%d, %i, %f)
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formatLogger.warn("Database has %d connections, CPU usage: %f%%", 25, 84.3);
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formatLogger.debug("Processing item %i of %d", 42, 100);
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// JSON formatting (%j)
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const user = { name: "Alice", role: "admin", active: true };
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const config = { timeout: 5000, retries: 3 };
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formatLogger.info("User data: %j, Config: %j", user, config);
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// Mixed formatting
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formatLogger.error(
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"API call failed for user %s (ID: %d) with config %j",
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"bob",
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1234,
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config,
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);
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// Multiple arguments without format specifiers
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formatLogger.warn("System alert:", "High memory usage detected", {
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usage: "89%",
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threshold: "80%",
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});
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// Literal percentage with %%
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formatLogger.info("Upload progress: 50%% complete");
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// Edge cases
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formatLogger.debug("Values: %s, %s, %d", null, undefined, null);
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console.log("\nJSON format with same messages:");
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const jsonFormatLogger = new Logger({ format: "json" });
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jsonFormatLogger.info("User %s logged in with %d failed attempts", "alice", 2);
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jsonFormatLogger.warn("Config loaded: %j", { env: "production", debug: false });
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