1 files changed, 290 insertions, 0 deletions
diff --git a/src/logger/index.ts b/src/logger/index.ts
new file mode 100644
index 000000000..28b720910
--- /dev/null
+++ b/src/logger/index.ts
@@ -0,0 +1,290 @@
+import format from 'date-fns/format'
+import {nanoid} from 'nanoid/non-secure'
+
+import {Sentry} from '#/logger/sentry'
+import * as env from '#/env'
+import {DebugContext} from '#/logger/debugContext'
+import {add} from '#/logger/logDump'
+
+export enum LogLevel {
+  Debug = 'debug',
+  Info = 'info',
+  Log = 'log',
+  Warn = 'warn',
+  Error = 'error',
+}
+
+type Transport = (
+  level: LogLevel,
+  message: string | Error,
+  metadata: Metadata,
+  timestamp: number,
+) => void
+
+/**
+ * A union of some of Sentry's breadcrumb properties as well as Sentry's
+ * `captureException` parameter, `CaptureContext`.
+ */
+type Metadata = {
+  /**
+   * Applied as Sentry breadcrumb types. Defaults to `default`.
+   *
+   * @see https://develop.sentry.dev/sdk/event-payloads/breadcrumbs/#breadcrumb-types
+   */
+  type?:
+    | 'default'
+    | 'debug'
+    | 'error'
+    | 'navigation'
+    | 'http'
+    | 'info'
+    | 'query'
+    | 'transaction'
+    | 'ui'
+    | 'user'
+
+  /**
+   * Passed through to `Sentry.captureException`
+   *
+   * @see https://github.com/getsentry/sentry-javascript/blob/903addf9a1a1534a6cb2ba3143654b918a86f6dd/packages/types/src/misc.ts#L65
+   */
+  tags?: {
+    [key: string]:
+      | number
+      | string
+      | boolean
+      | bigint
+      | symbol
+      | null
+      | undefined
+  }
+
+  /**
+   * Any additional data, passed through to Sentry as `extra` param on
+   * exceptions, or the `data` param on breadcrumbs.
+   */
+  [key: string]: unknown
+} & Parameters<typeof Sentry.captureException>[1]
+
+export type ConsoleTransportEntry = {
+  id: string
+  timestamp: number
+  level: LogLevel
+  message: string | Error
+  metadata: Metadata
+}
+
+const enabledLogLevels: {
+  [key in LogLevel]: LogLevel[]
+} = {
+  [LogLevel.Debug]: [
+    LogLevel.Debug,
+    LogLevel.Info,
+    LogLevel.Log,
+    LogLevel.Warn,
+    LogLevel.Error,
+  ],
+  [LogLevel.Info]: [LogLevel.Info, LogLevel.Log, LogLevel.Warn, LogLevel.Error],
+  [LogLevel.Log]: [LogLevel.Log, LogLevel.Warn, LogLevel.Error],
+  [LogLevel.Warn]: [LogLevel.Warn, LogLevel.Error],
+  [LogLevel.Error]: [LogLevel.Error],
+}
+
+/**
+ * Used in dev mode to nicely log to the console
+ */
+export const consoleTransport: Transport = (
+  level,
+  message,
+  metadata,
+  timestamp,
+) => {
+  const extra = Object.keys(metadata).length
+    ? ' ' + JSON.stringify(metadata, null, '  ')
+    : ''
+  const log = {
+    [LogLevel.Debug]: console.debug,
+    [LogLevel.Info]: console.info,
+    [LogLevel.Log]: console.log,
+    [LogLevel.Warn]: console.warn,
+    [LogLevel.Error]: console.error,
+  }[level]
+
+  log(`${format(timestamp, 'HH:mm:ss')} ${message.toString()}${extra}`)
+}
+
+export const sentryTransport: Transport = (
+  level,
+  message,
+  {type, tags, ...metadata},
+  timestamp,
+) => {
+  /**
+   * If a string, report a breadcrumb
+   */
+  if (typeof message === 'string') {
+    const severity = (
+      {
+        [LogLevel.Debug]: 'debug',
+        [LogLevel.Info]: 'info',
+        [LogLevel.Log]: 'log', // Sentry value here is undefined
+        [LogLevel.Warn]: 'warning',
+        [LogLevel.Error]: 'error',
+      } as const
+    )[level]
+
+    Sentry.addBreadcrumb({
+      message,
+      data: metadata,
+      type: type || 'default',
+      level: severity,
+      timestamp: timestamp / 1000, // Sentry expects seconds
+    })
+
+    /**
+     * Send all higher levels with `captureMessage`, with appropriate severity
+     * level
+     */
+    if (level === 'error' || level === 'warn' || level === 'log') {
+      const messageLevel = ({
+        [LogLevel.Log]: 'log',
+        [LogLevel.Warn]: 'warning',
+        [LogLevel.Error]: 'error',
+      }[level] || 'log') as Sentry.Breadcrumb['level']
+
+      Sentry.captureMessage(message, {
+        level: messageLevel,
+        tags,
+        extra: metadata,
+      })
+    }
+  } else {
+    /**
+     * It's otherwise an Error and should be reported with captureException
+     */
+    Sentry.captureException(message, {
+      tags,
+      extra: metadata,
+    })
+  }
+}
+
+/**
+ * Main class. Defaults are provided in the constructor so that subclasses are
+ * technically possible, if we need to go that route in the future.
+ */
+export class Logger {
+  LogLevel = LogLevel
+  DebugContext = DebugContext
+
+  enabled: boolean
+  level: LogLevel
+  transports: Transport[] = []
+
+  protected debugContextRegexes: RegExp[] = []
+
+  constructor({
+    enabled = !env.IS_TEST,
+    level = env.LOG_LEVEL as LogLevel,
+    debug = env.LOG_DEBUG || '',
+  }: {
+    enabled?: boolean
+    level?: LogLevel
+    debug?: string
+  } = {}) {
+    this.enabled = enabled !== false
+    this.level = debug ? LogLevel.Debug : level ?? LogLevel.Info // default to info
+    this.debugContextRegexes = (debug || '').split(',').map(context => {
+      return new RegExp(context.replace(/[^\w:*]/, '').replace(/\*/g, '.*'))
+    })
+  }
+
+  debug(message: string, metadata: Metadata = {}, context?: string) {
+    if (context && !this.debugContextRegexes.find(reg => reg.test(context)))
+      return
+    this.transport(LogLevel.Debug, message, metadata)
+  }
+
+  info(message: string, metadata: Metadata = {}) {
+    this.transport(LogLevel.Info, message, metadata)
+  }
+
+  log(message: string, metadata: Metadata = {}) {
+    this.transport(LogLevel.Log, message, metadata)
+  }
+
+  warn(message: string, metadata: Metadata = {}) {
+    this.transport(LogLevel.Warn, message, metadata)
+  }
+
+  error(error: Error | string, metadata: Metadata = {}) {
+    this.transport(LogLevel.Error, error, metadata)
+  }
+
+  addTransport(transport: Transport) {
+    this.transports.push(transport)
+    return () => {
+      this.transports.splice(this.transports.indexOf(transport), 1)
+    }
+  }
+
+  disable() {
+    this.enabled = false
+  }
+
+  enable() {
+    this.enabled = true
+  }
+
+  protected transport(
+    level: LogLevel,
+    message: string | Error,
+    metadata: Metadata = {},
+  ) {
+    if (!this.enabled) return
+    if (!enabledLogLevels[this.level].includes(level)) return
+
+    const timestamp = Date.now()
+    const meta = metadata || {}
+
+    for (const transport of this.transports) {
+      transport(level, message, meta, timestamp)
+    }
+
+    add({
+      id: nanoid(),
+      timestamp,
+      level,
+      message,
+      metadata: meta,
+    })
+  }
+}
+
+/**
+ * Logger instance. See `@/logger/README` for docs.
+ *
+ * Basic usage:
+ *
+ *   `logger.debug(message[, metadata, debugContext])`
+ *   `logger.info(message[, metadata])`
+ *   `logger.warn(message[, metadata])`
+ *   `logger.error(error[, metadata])`
+ *   `logger.disable()`
+ *   `logger.enable()`
+ */
+export const logger = new Logger()
+
+/**
+ * Report to console in dev, Sentry in prod, nothing in test.
+ */
+if (env.IS_DEV && !env.IS_TEST) {
+  logger.addTransport(consoleTransport)
+
+  /**
+   * Uncomment this to test Sentry in dev
+   */
+  // logger.addTransport(sentryTransport);
+} else if (env.IS_PROD) {
+  logger.addTransport(sentryTransport)
+}