Add intro/part1

intro/server/services/metrics.service.js

@@ -0,0 +1,96 @@
+let _ = require("lodash");
+
+module.exports = {
+	name: "metrics",
+	
+	events: {
+		"metrics.trace.span.start"(payload) {
+			this.requests[payload.id] = payload;
+			payload.spans = [];
+
+			if (payload.parent) {
+				let parent = this.requests[payload.parent];
+				if (parent)
+					parent.spans.push(payload.id);
+			}
+		},
+
+		"metrics.trace.span.finish"(payload) {
+			let item = this.requests[payload.id];
+			_.assign(item, payload);
+
+			if (!payload.parent)
+				this.printRequest(payload.id);
+		}
+	},
+
+	methods: {
+		printRequest(id) {
+			let main = this.requests[id];
+
+			let w = 73;
+			let r = _.repeat;
+			let gw = 35;
+			let maxTitle = w - 2 - 2 - gw - 2 - 1;
+
+			this.logger.info(["┌", r("─", w-2), "┐"].join(""));
+
+			let printSpanTime = (span) => {
+				let time = span.duration.toFixed(2);
+
+				let maxActionName = maxTitle - (span.level-1) * 2 - time.length - 3 - (span.fromCache ? 2 : 0) - (span.remoteCall ? 2 : 0) - (span.error ? 2 : 0);
+				let actionName = span.action ? span.action.name : "";
+				if (actionName.length > maxActionName) 
+					actionName = _.truncate(span.action.name, { length: maxActionName });
+
+				let strAction = [
+					r("  ", span.level - 1),
+					actionName,
+					r(" ", maxActionName - actionName.length + 1),
+					span.fromCache ? "* " : "",
+					span.remoteCall ? "» " : "",
+					span.error ? "× " : "",
+					time,
+					"ms "
+				].join("");
+
+				if (span.startTime == null || span.endTime == null) {
+					this.logger.info(strAction + "! Missing invoke !");
+					return;
+				}
+
+				let gstart = (span.startTime - main.startTime) / (main.endTime - main.startTime) * 100;
+				let gstop = (span.endTime - main.startTime) / (main.endTime - main.startTime) * 100;
+
+				if (_.isNaN(gstart) && _.isNaN(gstop)) {
+					gstart = 0;
+					gstop = 100;
+				}
+
+				let p1 = Math.round(gw * gstart / 100);
+				let p2 = Math.round(gw * gstop / 100) - p1;
+				let p3 = Math.max(gw - (p1 + p2), 0);
+
+				let gauge = [
+					"[",
+					r(".", p1),
+					r("■", p2),
+					r(".", p3),
+					"]"
+				].join("");
+
+				this.logger.info("│ " + strAction + gauge + " │");
+
+				if (span.spans.length > 0)
+					span.spans.forEach(spanID => printSpanTime(this.requests[spanID]));
+			};
+
+			printSpanTime(main);
+			this.logger.info(["└", r("─", w-2), "┘"].join(""));			
+		}
+	},
+
+	created() {
+		this.requests = {};
+	}
+};