Log refactoring (#1393)

* Create Logger class and log instance

* Replace yomichan.logWarning with log.warn

* Replace yomichan.logError with log.error

* Replace yomichan.log with log.log

* Update the Yomichan class to use the global log object

* Update lint rules

26 files changed, 144 insertions, 96 deletions

diff --git a/.eslintrc.json b/.eslintrc.json
index e2197916..fca1449b 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -111,9 +111,11 @@
                 "deepEqual": "readonly",
                 "generateId": "readonly",
                 "promiseAnimationFrame": "readonly",
+                "log": "readonly",
                 "DynamicProperty": "readonly",
                 "EventDispatcher": "readonly",
-                "EventListenerCollection": "readonly"
+                "EventListenerCollection": "readonly",
+                "Logger": "readonly"
             }
         },
         {
diff --git a/ext/js/app/content-script-main.js b/ext/js/app/content-script-main.js
index a09e52ea..1c0c6d49 100644
--- a/ext/js/app/content-script-main.js
+++ b/ext/js/app/content-script-main.js
@@ -52,6 +52,6 @@
 
         yomichan.ready();
     } catch (e) {
-        yomichan.logError(e);
+        log.error(e);
     }
 })();
diff --git a/ext/js/app/frontend.js b/ext/js/app/frontend.js
index 74cc63d2..02707f41 100644
--- a/ext/js/app/frontend.js
+++ b/ext/js/app/frontend.js
@@ -276,7 +276,7 @@ class Frontend {
                     this._showExtensionUnloaded(textSource);
                 }
             } else {
-                yomichan.logError(error);
+                log.error(error);
             }
         } if (type !== null) {
             this._stopClearSelectionDelayed();
@@ -563,7 +563,7 @@ class Frontend {
         );
         this._lastShowPromise.catch((error) => {
             if (yomichan.isExtensionUnloaded) { return; }
-            yomichan.logError(error);
+            log.error(error);
         });
         return this._lastShowPromise;
     }
diff --git a/ext/js/app/popup-proxy.js b/ext/js/app/popup-proxy.js
index 19856e3f..63ecc254 100644
--- a/ext/js/app/popup-proxy.js
+++ b/ext/js/app/popup-proxy.js
@@ -201,7 +201,7 @@ class PopupProxy extends EventDispatcher {
             }
             this._frameOffsetUpdatedAt = now;
         } catch (e) {
-            yomichan.logError(e);
+            log.error(e);
         } finally {
             this._frameOffsetPromise = null;
         }
diff --git a/ext/js/background/backend.js b/ext/js/background/backend.js
index 69c90aca..698724fc 100644
--- a/ext/js/background/backend.js
+++ b/ext/js/background/backend.js
@@ -204,7 +204,7 @@ class Backend {
             try {
                 await this._dictionaryDatabase.prepare();
             } catch (e) {
-                yomichan.logError(e);
+                log.error(e);
             }
 
             const deinflectionReasions = await this._fetchAsset('/data/deinflect.json', true);
@@ -226,7 +226,7 @@ class Backend {
             this._sendMessageAllTabsIgnoreResponse('backendReady', {});
             this._sendMessageIgnoreResponse({action: 'backendReady', params: {}});
         } catch (e) {
-            yomichan.logError(e);
+            log.error(e);
             throw e;
         } finally {
             if (this._badgePrepareDelayTimer !== null) {
@@ -358,7 +358,7 @@ class Backend {
             forwardPort.onDisconnect.addListener(cleanup);
         } catch (e) {
             port.disconnect();
-            yomichan.logError(e);
+            log.error(e);
         }
     }
 
@@ -612,7 +612,7 @@ class Backend {
     }
 
     _onApiLog({error, level, context}) {
-        yomichan.log(deserializeError(error), level, context);
+        log.log(deserializeError(error), level, context);
     }
 
     _onApiLogIndicatorClear() {
diff --git a/ext/js/comm/cross-frame-api.js b/ext/js/comm/cross-frame-api.js
index 997249c8..7dbfb411 100644
--- a/ext/js/comm/cross-frame-api.js
+++ b/ext/js/comm/cross-frame-api.js
@@ -111,7 +111,7 @@ class CrossFrameAPIPort extends EventDispatcher {
     _onAck(id) {
         const invocation = this._activeInvocations.get(id);
         if (typeof invocation === 'undefined') {
-            yomichan.logWarning(new Error(`Request ${id} not found for acknowledgement`));
+            log.warn(new Error(`Request ${id} not found for acknowledgement`));
             return;
         }
 
@@ -140,7 +140,7 @@ class CrossFrameAPIPort extends EventDispatcher {
     _onResult(id, data) {
         const invocation = this._activeInvocations.get(id);
         if (typeof invocation === 'undefined') {
-            yomichan.logWarning(new Error(`Request ${id} not found`));
+            log.warn(new Error(`Request ${id} not found`));
             return;
         }
 
@@ -269,7 +269,7 @@ class CrossFrameAPI {
             this._setupCommPort(otherTabId, otherFrameId, port);
         } catch (e) {
             port.disconnect();
-            yomichan.logError(e);
+            log.error(e);
         }
     }
 
diff --git a/ext/js/core.js b/ext/js/core.js
index 9305739a..4384d9f0 100644
--- a/ext/js/core.js
+++ b/ext/js/core.js
@@ -607,3 +607,111 @@ class DynamicProperty extends EventDispatcher {
         this.trigger('change', {value});
     }
 }
+
+/**
+ * This class handles logging of messages to the console and triggering
+ * an event for log calls.
+ */
+class Logger extends EventDispatcher {
+    /**
+     * Creates a new instance.
+     */
+    constructor() {
+        super();
+        this._extensionName = 'Yomichan';
+        try {
+            const {name, version} = chrome.runtime.getManifest();
+            this._extensionName = `${name} ${version}`;
+        } catch (e) {
+            // NOP
+        }
+    }
+
+    /**
+     * Logs a generic error. This will trigger the 'log' event with the same arguments as the function invocation.
+     * @param error The error to log. This is typically an `Error` or `Error`-like object.
+     * @param level The level to log at. Values include `'info'`, `'debug'`, `'warn'`, and `'error'`.
+     *   Other values will be logged at a non-error level.
+     * @param context An optional context object for the error which should typically include a `url` field.
+     */
+    log(error, level, context=null) {
+        if (!isObject(context)) {
+            context = {url: location.href};
+        }
+
+        let errorString;
+        try {
+            if (typeof error === 'string') {
+                errorString = error;
+            } else {
+                errorString = error.toString();
+                if (/^\[object \w+\]$/.test(errorString)) {
+                    errorString = JSON.stringify(error);
+                }
+            }
+        } catch (e) {
+            errorString = `${error}`;
+        }
+
+        let errorStack;
+        try {
+            errorStack = (typeof error.stack === 'string' ? error.stack.trimRight() : '');
+        } catch (e) {
+            errorStack = '';
+        }
+
+        let errorData;
+        try {
+            errorData = error.data;
+        } catch (e) {
+            // NOP
+        }
+
+        if (errorStack.startsWith(errorString)) {
+            errorString = errorStack;
+        } else if (errorStack.length > 0) {
+            errorString += `\n${errorStack}`;
+        }
+
+        let message = `${this._extensionName} has encountered a problem.`;
+        message += `\nOriginating URL: ${context.url}\n`;
+        message += errorString;
+        if (typeof errorData !== 'undefined') {
+            message += `\nData: ${JSON.stringify(errorData, null, 4)}`;
+        }
+        message += '\n\nIssues can be reported at https://github.com/FooSoft/yomichan/issues';
+
+        switch (level) {
+            case 'info': console.info(message); break;
+            case 'debug': console.debug(message); break;
+            case 'warn': console.warn(message); break;
+            case 'error': console.error(message); break;
+            default: console.log(message); break;
+        }
+
+        this.trigger('log', {error, level, context});
+    }
+
+    /**
+     * Logs a warning. This function invokes `log` internally.
+     * @param error The error to log. This is typically an `Error` or `Error`-like object.
+     * @param context An optional context object for the error which should typically include a `url` field.
+     */
+    warn(error, context=null) {
+        this.log(error, 'warn', context);
+    }
+
+    /**
+     * Logs an error. This function invokes `log` internally.
+     * @param error The error to log. This is typically an `Error` or `Error`-like object.
+     * @param context An optional context object for the error which should typically include a `url` field.
+     */
+    error(error, context=null) {
+        this.log(error, 'error', context);
+    }
+}
+
+/**
+ * This object is the default logger used by the runtime.
+ */
+const log = new Logger();
diff --git a/ext/js/display/display.js b/ext/js/display/display.js
index 553c17e7..b7477bb8 100644
--- a/ext/js/display/display.js
+++ b/ext/js/display/display.js
@@ -272,7 +272,7 @@ class Display extends EventDispatcher {
 
     onError(error) {
         if (yomichan.isExtensionUnloaded) { return; }
-        yomichan.logError(error);
+        log.error(error);
     }
 
     getOptions() {
@@ -1552,7 +1552,7 @@ class Display extends EventDispatcher {
                 }
                 await this._frontendSetupPromise;
             } catch (e) {
-                yomichan.logError(e);
+                log.error(e);
                 return;
             } finally {
                 this._frontendSetupPromise = null;
@@ -1721,7 +1721,7 @@ class Display extends EventDispatcher {
 
     _onDefinitionTextScannerSearched({type, definitions, sentence, textSource, optionsContext, error}) {
         if (error !== null && !yomichan.isExtensionUnloaded) {
-            yomichan.logError(error);
+            log.error(error);
         }
 
         if (type === null) { return; }
diff --git a/ext/js/display/popup-main.js b/ext/js/display/popup-main.js
index 24be6c01..55f19984 100644
--- a/ext/js/display/popup-main.js
+++ b/ext/js/display/popup-main.js
@@ -49,6 +49,6 @@
 
         yomichan.ready();
     } catch (e) {
-        yomichan.logError(e);
+        log.error(e);
     }
 })();
diff --git a/ext/js/display/query-parser.js b/ext/js/display/query-parser.js
index 29401657..d6a3b4da 100644
--- a/ext/js/display/query-parser.js
+++ b/ext/js/display/query-parser.js
@@ -89,7 +89,7 @@ class QueryParser extends EventDispatcher {
     _onSearched(e) {
         const {error} = e;
         if (error !== null) {
-            yomichan.logError(error);
+            log.error(error);
             return;
         }
         if (e.type === null) { return; }
diff --git a/ext/js/display/search-main.js b/ext/js/display/search-main.js
index 08645833..5ad50500 100644
--- a/ext/js/display/search-main.js
+++ b/ext/js/display/search-main.js
@@ -50,6 +50,6 @@
 
         yomichan.ready();
     } catch (e) {
-        yomichan.logError(e);
+        log.error(e);
     }
 })();
diff --git a/ext/js/general/task-accumulator.js b/ext/js/general/task-accumulator.js
index 82691b43..3f3d8ff7 100644
--- a/ext/js/general/task-accumulator.js
+++ b/ext/js/general/task-accumulator.js
@@ -69,7 +69,7 @@ class TaskAccumulator {
             ];
             await this._runTasks(allTasks);
         } catch (e) {
-            yomichan.logError(e);
+            log.error(e);
         }
     }
 
diff --git a/ext/js/language/dictionary-database.js b/ext/js/language/dictionary-database.js
index b363ed25..62c22289 100644
--- a/ext/js/language/dictionary-database.js
+++ b/ext/js/language/dictionary-database.js
@@ -122,7 +122,7 @@ class DictionaryDatabase {
             await Database.deleteDatabase(this._dbName);
             result = true;
         } catch (e) {
-            yomichan.logError(e);
+            log.error(e);
         }
         await this.prepare();
         return result;
diff --git a/ext/js/language/text-scanner.js b/ext/js/language/text-scanner.js
index e91498ba..073b1a6c 100644
--- a/ext/js/language/text-scanner.js
+++ b/ext/js/language/text-scanner.js
@@ -830,7 +830,7 @@ class TextScanner extends EventDispatcher {
                 }
             }
         } catch (e) {
-            yomichan.logError(e);
+            log.error(e);
         } finally {
             this._pendingLookup = false;
         }
diff --git a/ext/js/pages/info-main.js b/ext/js/pages/info-main.js
index 45c28d25..ca7d792e 100644
--- a/ext/js/pages/info-main.js
+++ b/ext/js/pages/info-main.js
@@ -120,6 +120,6 @@ function getOperatingSystemDisplayName(os) {
 
         document.documentElement.dataset.loaded = 'true';
     } catch (e) {
-        yomichan.logError(e);
+        log.error(e);
     }
 })();
diff --git a/ext/js/pages/permissions-main.js b/ext/js/pages/permissions-main.js
index 0cb37e93..782ea9ec 100644
--- a/ext/js/pages/permissions-main.js
+++ b/ext/js/pages/permissions-main.js
@@ -96,6 +96,6 @@ function setupPermissionsToggles() {
 
         document.documentElement.dataset.loaded = 'true';
     } catch (e) {
-        yomichan.logError(e);
+        log.error(e);
     }
 })();
diff --git a/ext/js/pages/welcome-main.js b/ext/js/pages/welcome-main.js
index 5a6bb2a5..27d0af6a 100644
--- a/ext/js/pages/welcome-main.js
+++ b/ext/js/pages/welcome-main.js
@@ -81,6 +81,6 @@ async function setupGenericSettingsController(genericSettingController) {
         const settingsDisplayController = new SettingsDisplayController(settingsController, modalController);
         settingsDisplayController.prepare();
     } catch (e) {
-        yomichan.logError(e);
+        log.error(e);
     }
 })();
diff --git a/ext/js/settings/anki-controller.js b/ext/js/settings/anki-controller.js
index db3e3c14..26cab68f 100644
--- a/ext/js/settings/anki-controller.js
+++ b/ext/js/settings/anki-controller.js
@@ -638,7 +638,7 @@ class AnkiCardController {
         try {
             await this._settingsController.permissionsUtil.setPermissionsGranted({permissions}, true);
         } catch (e) {
-            yomichan.logError(e);
+            log.error(e);
         }
     }
 
diff --git a/ext/js/settings/backup-controller.js b/ext/js/settings/backup-controller.js
index 117f2422..649645d4 100644
--- a/ext/js/settings/backup-controller.js
+++ b/ext/js/settings/backup-controller.js
@@ -173,7 +173,7 @@ class BackupController {
     }
 
     _showSettingsImportError(error) {
-        yomichan.logError(error);
+        log.error(error);
         document.querySelector('#settings-import-error-message').textContent = `${error}`;
         this._settingsImportErrorModal.setVisible(true);
     }
@@ -412,7 +412,7 @@ class BackupController {
         try {
             await this._settingsImportSetOptionsFull(optionsFull);
         } catch (e) {
-            yomichan.logError(e);
+            log.error(e);
         }
     }
 }
diff --git a/ext/js/settings/dictionary-controller.js b/ext/js/settings/dictionary-controller.js
index 78173202..e12017f2 100644
--- a/ext/js/settings/dictionary-controller.js
+++ b/ext/js/settings/dictionary-controller.js
@@ -476,7 +476,7 @@ class DictionaryController {
             await this._deleteDictionaryInternal(dictionaryTitle, onProgress);
             await this._deleteDictionarySettings(dictionaryTitle);
         } catch (e) {
-            yomichan.logError(e);
+            log.error(e);
         } finally {
             prevention.end();
             for (const progress of progressContainers) { progress.hidden = true; }
diff --git a/ext/js/settings/dictionary-import-controller.js b/ext/js/settings/dictionary-import-controller.js
index 00eb7b95..1389b7f0 100644
--- a/ext/js/settings/dictionary-import-controller.js
+++ b/ext/js/settings/dictionary-import-controller.js
@@ -253,7 +253,7 @@ class DictionaryImportController {
     _showErrors(errors) {
         const uniqueErrors = new Map();
         for (const error of errors) {
-            yomichan.logError(error);
+            log.error(error);
             const errorString = this._errorToString(error);
             let count = uniqueErrors.get(errorString);
             if (typeof count === 'undefined') {
diff --git a/ext/js/settings/main.js b/ext/js/settings/main.js
index 51cd5f27..9785ee0e 100644
--- a/ext/js/settings/main.js
+++ b/ext/js/settings/main.js
@@ -104,6 +104,6 @@ async function setupEnvironmentInfo() {
 
         yomichan.ready();
     } catch (e) {
-        yomichan.logError(e);
+        log.error(e);
     }
 })();
diff --git a/ext/js/settings/pitch-accents-preview-main.js b/ext/js/settings/pitch-accents-preview-main.js
index fe3bd36d..d9d56727 100644
--- a/ext/js/settings/pitch-accents-preview-main.js
+++ b/ext/js/settings/pitch-accents-preview-main.js
@@ -30,6 +30,6 @@
         await displayGenerator.prepare();
         displayGenerator.preparePitchAccents();
     } catch (e) {
-        yomichan.logError(e);
+        log.error(e);
     }
 })();
diff --git a/ext/js/settings/popup-preview-frame-main.js b/ext/js/settings/popup-preview-frame-main.js
index a62e8d28..80e248be 100644
--- a/ext/js/settings/popup-preview-frame-main.js
+++ b/ext/js/settings/popup-preview-frame-main.js
@@ -38,6 +38,6 @@
 
         document.documentElement.dataset.loaded = 'true';
     } catch (e) {
-        yomichan.logError(e);
+        log.error(e);
     }
 })();
diff --git a/ext/js/settings/settings-main.js b/ext/js/settings/settings-main.js
index a5bb642c..273142cd 100644
--- a/ext/js/settings/settings-main.js
+++ b/ext/js/settings/settings-main.js
@@ -149,6 +149,6 @@ async function setupGenericSettingsController(genericSettingController) {
         const settingsDisplayController = new SettingsDisplayController(settingsController, modalController);
         settingsDisplayController.prepare();
     } catch (e) {
-        yomichan.logError(e);
+        log.error(e);
     }
 })();
diff --git a/ext/js/yomichan.js b/ext/js/yomichan.js
index 73deeab9..107694e9 100644
--- a/ext/js/yomichan.js
+++ b/ext/js/yomichan.js
@@ -103,7 +103,7 @@ class Yomichan extends EventDispatcher {
             this.sendMessage({action: 'requestBackendReadySignal'});
             await this._isBackendReadyPromise;
 
-            this.on('log', this._onForwardLog.bind(this));
+            log.on('log', this._onForwardLog.bind(this));
         }
     }
 
@@ -156,68 +156,6 @@ class Yomichan extends EventDispatcher {
         });
     }
 
-    logWarning(error) {
-        this.log(error, 'warn');
-    }
-
-    logError(error) {
-        this.log(error, 'error');
-    }
-
-    log(error, level, context=null) {
-        if (!isObject(context)) {
-            context = this._getLogContext();
-        }
-
-        let errorString;
-        try {
-            errorString = error.toString();
-            if (/^\[object \w+\]$/.test(errorString)) {
-                errorString = JSON.stringify(error);
-            }
-        } catch (e) {
-            errorString = `${error}`;
-        }
-
-        let errorStack;
-        try {
-            errorStack = (typeof error.stack === 'string' ? error.stack.trimRight() : '');
-        } catch (e) {
-            errorStack = '';
-        }
-
-        let errorData;
-        try {
-            errorData = error.data;
-        } catch (e) {
-            // NOP
-        }
-
-        if (errorStack.startsWith(errorString)) {
-            errorString = errorStack;
-        } else if (errorStack.length > 0) {
-            errorString += `\n${errorStack}`;
-        }
-
-        let message = `${this._extensionName} has encountered a problem.`;
-        message += `\nOriginating URL: ${context.url}\n`;
-        message += errorString;
-        if (typeof errorData !== 'undefined') {
-            message += `\nData: ${JSON.stringify(errorData, null, 4)}`;
-        }
-        message += '\n\nIssues can be reported at https://github.com/FooSoft/yomichan/issues';
-
-        switch (level) {
-            case 'info': console.info(message); break;
-            case 'debug': console.debug(message); break;
-            case 'warn': console.warn(message); break;
-            case 'error': console.error(message); break;
-            default: console.log(message); break;
-        }
-
-        this.trigger('log', {error, level, context});
-    }
-
     sendMessage(...args) {
         try {
             return chrome.runtime.sendMessage(...args);