From 356ebd2137eb5ca31486ed49ab8223c8256b1554 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Fri, 18 Nov 2016 04:09:04 +0100
Subject: persistent logging

---
 src/logging.ts | 186 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 186 insertions(+)
 create mode 100644 src/logging.ts

(limited to 'src/logging.ts')

diff --git a/src/logging.ts b/src/logging.ts
new file mode 100644
index 000000000..3f8757a07
--- /dev/null
+++ b/src/logging.ts
@@ -0,0 +1,186 @@
+/*
+ This file is part of TALER
+ (C) 2016 Inria
+
+ TALER is free software; you can redistribute it and/or modify it under the
+ terms of the GNU General Public License as published by the Free Software
+ Foundation; either version 3, or (at your option) any later version.
+
+ TALER is distributed in the hope that it will be useful, but WITHOUT ANY
+ WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
+ A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along with
+ TALER; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+/**
+ * Configurable logging.
+ *
+ * @author Florian Dold
+ */
+
+import {Store, QueryRoot} from "./query";
+
+export type Level = "error" | "debug" | "info" | "warn";
+
+function makeInfo() {
+  return console.info.bind(console, "%o");
+}
+
+function makeWarn() {
+  return console.warn.bind(console, "%o");
+}
+
+function makeError() {
+  return console.error.bind(console, "%o");
+}
+
+function makeDebug() {
+  return console.log.bind(console, "%o");
+}
+
+export async function log(msg: string, level: Level = "info"): Promise<void> {
+  let ci = getCallInfo(2);
+  return record(level, msg, ci.file, ci.line, ci.column);
+}
+
+function getCallInfo(level: number) {
+  // see https://github.com/v8/v8/wiki/Stack-Trace-API
+  let stack = Error().stack;
+  if (!stack) {
+    return unknownFrame;
+  }
+  let lines = stack.split("\n");
+  return parseStackLine(lines[level + 1]);
+}
+
+interface Frame {
+  file?: string;
+  method?: string;
+  column?: number;
+  line?: number;
+}
+
+const unknownFrame: Frame = {
+  file: "(unknown)",
+  method: "(unknown)",
+  line: 0,
+  column: 0
+};
+
+/**
+ * Adapted from https://github.com/errwischt/stacktrace-parser.
+ */
+function parseStackLine(stackLine: string): Frame {
+  const chrome = /^\s*at (?:(?:(?:Anonymous function)?|((?:\[object object\])?\S+(?: \[as \S+\])?)) )?\(?((?:file|http|https):.*?):(\d+)(?::(\d+))?\)?\s*$/i;
+  const gecko = /^(?:\s*([^@]*)(?:\((.*?)\))?@)?(\S.*?):(\d+)(?::(\d+))?\s*$/i;
+  const node  = /^\s*at (?:((?:\[object object\])?\S+(?: \[as \S+\])?) )?\(?(.*?):(\d+)(?::(\d+))?\)?\s*$/i;
+  let parts;
+
+  if ((parts = gecko.exec(stackLine))) {
+    let f: Frame = {
+        file: parts[3],
+        method: parts[1] || "(unknown)",
+        line: +parts[4],
+        column: parts[5] ? +parts[5] : undefined,
+    };
+    return f;
+  } else if ((parts = chrome.exec(stackLine))) {
+    let f: Frame = {
+        file: parts[2],
+        method: parts[1] || "(unknown)",
+        line: +parts[3],
+        column: parts[4] ? +parts[4] : undefined,
+    };
+    return f;
+  } else if ((parts = node.exec(stackLine))) {
+    let f: Frame = {
+        file: parts[2],
+        method: parts[1] || "(unknown)",
+        line: +parts[3],
+        column: parts[4] ? +parts[4] : undefined,
+    };
+    return f;
+  }
+  return unknownFrame;
+}
+
+
+let db: IDBDatabase|undefined = undefined;
+
+export interface LogEntry {
+  timestamp: number;
+  level: string;
+  msg: string;
+  source: string|undefined;
+  col: number|undefined;
+  line: number|undefined;
+  id?: number;
+}
+
+export async function getLogs(): Promise<LogEntry[]> {
+  if (!db) {
+    db = await openLoggingDb();
+  }
+  return await new QueryRoot(db).iter(logsStore).toArray();
+}
+
+export async function record(level: Level, msg: string, source?: string, line?: number, col?: number): Promise<void> {
+  if (typeof indexedDB === "undefined") {
+    return;
+  }
+  if (!db) {
+    db = await openLoggingDb();
+  }
+
+  let count = await new QueryRoot(db).count(logsStore);
+
+  console.log("count is", count);
+
+  if (count > 1000) {
+    await new QueryRoot(db).deleteIf(logsStore, (e, i) => (i < 200));
+  }
+
+  let entry: LogEntry = {
+    timestamp: new Date().getTime(),
+    level,
+    msg,
+    source,
+    line,
+    col,
+  };
+  await new QueryRoot(db).put(logsStore, entry);
+}
+
+const loggingDbVersion = 1;
+
+const logsStore: Store<LogEntry> = new Store<LogEntry>("logs");
+
+export function openLoggingDb(): Promise<IDBDatabase> {
+  return new Promise((resolve, reject) => {
+    const req = indexedDB.open("taler-logging", loggingDbVersion);
+    req.onerror = (e) => {
+      reject(e);
+    };
+    req.onsuccess = (e) => {
+      resolve(req.result);
+    };
+    req.onupgradeneeded = (e) => {
+      const db = req.result;
+      if (e.oldVersion != 0) {
+        try {
+          db.deleteObjectStore("logs");
+        } catch (e) {
+          console.error(e);
+        }
+      }
+      db.createObjectStore("logs", {keyPath: "id", autoIncrement: true});
+    };
+  });
+}
+
+export const info = makeInfo();
+export const debug = makeDebug();
+export const warn = makeWarn();
+export const error = makeError();
-- 
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