Add internal session plugin to the React Native tracker

api-docs/docs/react-native-tracker/markdown/react-native-tracker.md

@@ -41,6 +41,7 @@
 |  [PayloadBuilder](./react-native-tracker.payloadbuilder.md) | Interface for mutable object encapsulating tracker payload |
 |  [RuleSet](./react-native-tracker.ruleset.md) | A ruleset has accept or reject properties that contain rules for matching Iglu schema URIs |
 |  [SessionConfiguration](./react-native-tracker.sessionconfiguration.md) | Configuration for session tracking |
+|  [SessionState](./react-native-tracker.sessionstate.md) | Current session state that is tracked in events. |
 |  [StructuredEvent](./react-native-tracker.structuredevent.md) | A Structured Event A classic style of event tracking, allows for easier movement between analytics systems. A loosely typed event, creating a Self Describing event is preferred, but useful for interoperability. |
 |  [SubjectConfiguration](./react-native-tracker.subjectconfiguration.md) | Configuration of subject properties tracked with events |
 |  [TrackerConfiguration](./react-native-tracker.trackerconfiguration.md) | The configuration object for initialising the tracker |

api-docs/docs/react-native-tracker/markdown/react-native-tracker.reactnativetracker.md

@@ -33,7 +33,11 @@ export declare type ReactNativeTracker = {
     readonly setScreenViewport: (newView: ScreenSize) => void;
     readonly setColorDepth: (newLang: number) => void;
     readonly setSubjectData: (config: SubjectConfiguration) => void;
+    readonly getSessionUserId: () => Promise<string | undefined>;
+    readonly getSessionId: () => Promise<string | undefined>;
+    readonly getSessionIndex: () => Promise<number | undefined>;
+    readonly getSessionState: () => Promise<SessionState | undefined>;
 };
 ```
-<b>References:</b> [EventContext](./react-native-tracker.eventcontext.md)<!-- -->, [TimingProps](./react-native-tracker.timingprops.md)<!-- -->, [MessageNotificationProps](./react-native-tracker.messagenotificationprops.md)<!-- -->, [ScreenSize](./react-native-tracker.screensize.md)<!-- -->, [SubjectConfiguration](./react-native-tracker.subjectconfiguration.md)
+<b>References:</b> [EventContext](./react-native-tracker.eventcontext.md)<!-- -->, [TimingProps](./react-native-tracker.timingprops.md)<!-- -->, [MessageNotificationProps](./react-native-tracker.messagenotificationprops.md)<!-- -->, [ScreenSize](./react-native-tracker.screensize.md)<!-- -->, [SubjectConfiguration](./react-native-tracker.subjectconfiguration.md)<!-- -->, [SessionState](./react-native-tracker.sessionstate.md)
 

api-docs/docs/react-native-tracker/markdown/react-native-tracker.sessionstate.eventindex.md

@@ -0,0 +1,13 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [@snowplow/react-native-tracker](./react-native-tracker.md) &gt; [SessionState](./react-native-tracker.sessionstate.md) &gt; [eventIndex](./react-native-tracker.sessionstate.eventindex.md)
+
+## SessionState.eventIndex property
+
+Optional index of the current event in the session
+
+<b>Signature:</b>
+
+```typescript
+eventIndex?: number;
+```

api-docs/docs/react-native-tracker/markdown/react-native-tracker.sessionstate.firsteventid.md

@@ -0,0 +1,13 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [@snowplow/react-native-tracker](./react-native-tracker.md) &gt; [SessionState](./react-native-tracker.sessionstate.md) &gt; [firstEventId](./react-native-tracker.sessionstate.firsteventid.md)
+
+## SessionState.firstEventId property
+
+The optional identifier of the first event for this session
+
+<b>Signature:</b>
+
+```typescript
+firstEventId?: string;
+```

api-docs/docs/react-native-tracker/markdown/react-native-tracker.sessionstate.firsteventtimestamp.md

@@ -0,0 +1,13 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [@snowplow/react-native-tracker](./react-native-tracker.md) &gt; [SessionState](./react-native-tracker.sessionstate.md) &gt; [firstEventTimestamp](./react-native-tracker.sessionstate.firsteventtimestamp.md)
+
+## SessionState.firstEventTimestamp property
+
+Optional date-time timestamp of when the first event in the session was tracked
+
+<b>Signature:</b>
+
+```typescript
+firstEventTimestamp?: string;
+```

api-docs/docs/react-native-tracker/markdown/react-native-tracker.sessionstate.md

@@ -0,0 +1,27 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [@snowplow/react-native-tracker](./react-native-tracker.md) &gt; [SessionState](./react-native-tracker.sessionstate.md)
+
+## SessionState interface
+
+Current session state that is tracked in events.
+
+<b>Signature:</b>
+
+```typescript
+export interface SessionState 
+```
+
+## Properties
+
+|  Property | Type | Description |
+|  --- | --- | --- |
+|  [eventIndex?](./react-native-tracker.sessionstate.eventindex.md) | number | <i>(Optional)</i> Optional index of the current event in the session |
+|  [firstEventId?](./react-native-tracker.sessionstate.firsteventid.md) | string | <i>(Optional)</i> The optional identifier of the first event for this session |
+|  [firstEventTimestamp?](./react-native-tracker.sessionstate.firsteventtimestamp.md) | string | <i>(Optional)</i> Optional date-time timestamp of when the first event in the session was tracked |
+|  [previousSessionId?](./react-native-tracker.sessionstate.previoussessionid.md) | string | <i>(Optional)</i> The previous session identifier for this user |
+|  [sessionId](./react-native-tracker.sessionstate.sessionid.md) | string | An identifier for the session |
+|  [sessionIndex](./react-native-tracker.sessionstate.sessionindex.md) | number | The index of the current session for this user |
+|  [storageMechanism](./react-native-tracker.sessionstate.storagemechanism.md) | string | The mechanism that the session information has been stored on the device |
+|  [userId](./react-native-tracker.sessionstate.userid.md) | string | An identifier for the user of the session |
+

api-docs/docs/react-native-tracker/markdown/react-native-tracker.sessionstate.previoussessionid.md

@@ -0,0 +1,13 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [@snowplow/react-native-tracker](./react-native-tracker.md) &gt; [SessionState](./react-native-tracker.sessionstate.md) &gt; [previousSessionId](./react-native-tracker.sessionstate.previoussessionid.md)
+
+## SessionState.previousSessionId property
+
+The previous session identifier for this user
+
+<b>Signature:</b>
+
+```typescript
+previousSessionId?: string;
+```

api-docs/docs/react-native-tracker/markdown/react-native-tracker.sessionstate.sessionid.md

@@ -0,0 +1,13 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [@snowplow/react-native-tracker](./react-native-tracker.md) &gt; [SessionState](./react-native-tracker.sessionstate.md) &gt; [sessionId](./react-native-tracker.sessionstate.sessionid.md)
+
+## SessionState.sessionId property
+
+An identifier for the session
+
+<b>Signature:</b>
+
+```typescript
+sessionId: string;
+```

api-docs/docs/react-native-tracker/markdown/react-native-tracker.sessionstate.sessionindex.md

@@ -0,0 +1,13 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [@snowplow/react-native-tracker](./react-native-tracker.md) &gt; [SessionState](./react-native-tracker.sessionstate.md) &gt; [sessionIndex](./react-native-tracker.sessionstate.sessionindex.md)
+
+## SessionState.sessionIndex property
+
+The index of the current session for this user
+
+<b>Signature:</b>
+
+```typescript
+sessionIndex: number;
+```

api-docs/docs/react-native-tracker/markdown/react-native-tracker.sessionstate.storagemechanism.md

@@ -0,0 +1,13 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [@snowplow/react-native-tracker](./react-native-tracker.md) &gt; [SessionState](./react-native-tracker.sessionstate.md) &gt; [storageMechanism](./react-native-tracker.sessionstate.storagemechanism.md)
+
+## SessionState.storageMechanism property
+
+The mechanism that the session information has been stored on the device
+
+<b>Signature:</b>
+
+```typescript
+storageMechanism: string;
+```

api-docs/docs/react-native-tracker/markdown/react-native-tracker.sessionstate.userid.md

@@ -0,0 +1,13 @@
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[Home](./index.md) &gt; [@snowplow/react-native-tracker](./react-native-tracker.md) &gt; [SessionState](./react-native-tracker.sessionstate.md) &gt; [userId](./react-native-tracker.sessionstate.userid.md)
+
+## SessionState.userId property
+
+An identifier for the user of the session
+
+<b>Signature:</b>
+
+```typescript
+userId: string;
+```

api-docs/docs/react-native-tracker/react-native-tracker.api.md

@@ -300,6 +300,10 @@ export type ReactNativeTracker = {
     readonly setScreenViewport: (newView: ScreenSize) => void;
     readonly setColorDepth: (newLang: number) => void;
     readonly setSubjectData: (config: SubjectConfiguration) => void;
+    readonly getSessionUserId: () => Promise<string | undefined>;
+    readonly getSessionId: () => Promise<string | undefined>;
+    readonly getSessionIndex: () => Promise<number | undefined>;
+    readonly getSessionState: () => Promise<SessionState | undefined>;
 };
 
 // @public
@@ -366,6 +370,18 @@ export interface SessionConfiguration {
     foregroundSessionTimeout?: number;
 }
 
+// @public
+export interface SessionState {
+    eventIndex?: number;
+    firstEventId?: string;
+    firstEventTimestamp?: string;
+    previousSessionId?: string;
+    sessionId: string;
+    sessionIndex: number;
+    storageMechanism: string;
+    userId: string;
+}
+
 // @public
 export interface StructuredEvent {
     // (undocumented)

common/changes/@snowplow/react-native-tracker/issue-react_native_session_2024-11-21-13-47.json

@@ -0,0 +1,10 @@
+{
+  "changes": [
+    {
+      "packageName": "@snowplow/react-native-tracker",
+      "comment": "Add internal session plugin to the React Native tracker (#1388)",
+      "type": "none"
+    }
+  ],
+  "packageName": "@snowplow/react-native-tracker"
+}

common/config/rush/browser-approved-packages.json

@@ -212,7 +212,7 @@
     },
     {
       "name": "@types/uuid",
-      "allowedCategories": [ "libraries", "plugins" ]
+      "allowedCategories": [ "libraries", "plugins", "trackers" ]
     },
     {
       "name": "@types/vimeo__player",
@@ -440,7 +440,7 @@
     },
     {
       "name": "uuid",
-      "allowedCategories": [ "libraries", "plugins" ]
+      "allowedCategories": [ "libraries", "plugins", "trackers" ]
     },
     {
       "name": "wdio-chromedriver-service",

common/config/rush/repo-state.json

@@ -1,5 +1,5 @@
 // DO NOT MODIFY THIS FILE MANUALLY BUT DO COMMIT IT. It is generated and used by Rush.
 {
-  "pnpmShrinkwrapHash": "f5c19c955ef1b13843dbacdb20bdd6461a9a5042",
+  "pnpmShrinkwrapHash": "bf1ad132a0781c6f74cda6742bc190f7802256f1",
   "preferredVersionsHash": "bf21a9e8fbc5a3846fb05b4fa0859e0917b2202f"
 }

trackers/react-native-tracker/package.json

@@ -50,7 +50,8 @@
     "@snowplow/tracker-core": "workspace:*",
     "@react-native-async-storage/async-storage": "~2.0.0",
     "react-native-get-random-values": "~1.11.0",
-    "tslib": "^2.3.1"
+    "tslib": "^2.3.1",
+    "uuid": "^10.0.0"
   },
   "devDependencies": {
     "@typescript-eslint/eslint-plugin": "~5.15.0",
@@ -59,6 +60,7 @@
     "typescript": "~4.6.2",
     "@types/jest": "~28.1.1",
     "@types/node": "~14.6.0",
+    "@types/uuid": "^10.0.0",
     "jest": "~28.1.3",
     "react": "18.2.0",
     "ts-jest": "~28.0.8",

trackers/react-native-tracker/src/constants.ts

@@ -0,0 +1,4 @@
+export const FOREGROUND_EVENT_SCHEMA = 'iglu:com.snowplowanalytics.snowplow/application_foreground/jsonschema/1-0-0';
+export const BACKGROUND_EVENT_SCHEMA = 'iglu:com.snowplowanalytics.snowplow/application_background/jsonschema/1-0-0';
+
+export const CLIENT_SESSION_ENTITY_SCHEMA ='iglu:com.snowplowanalytics.snowplow/client_session/jsonschema/1-0-2'

trackers/react-native-tracker/src/plugins/session/index.ts

@@ -0,0 +1,124 @@
+import { CorePluginConfiguration, PayloadBuilder } from '@snowplow/tracker-core';
+import { SessionConfiguration, SessionState, TrackerConfiguration } from '../../types';
+import AsyncStorage from '@react-native-async-storage/async-storage';
+import { v4 as uuidv4 } from 'uuid';
+import { BACKGROUND_EVENT_SCHEMA, CLIENT_SESSION_ENTITY_SCHEMA, FOREGROUND_EVENT_SCHEMA } from '../../constants';
+import { getUsefulSchema } from '../../utils';
+
+interface StoredSessionState {
+  userId: string;
+  sessionId: string;
+  sessionIndex: number;
+}
+
+interface SessionPlugin extends CorePluginConfiguration {
+  getSessionUserId: () => Promise<string | undefined>;
+  getSessionId: () => Promise<string | undefined>;
+  getSessionIndex: () => Promise<number | undefined>;
+  getSessionState: () => Promise<SessionState>;
+  startNewSession: () => Promise<void>;
+}
+
+async function storeSessionState(namespace: string, state: StoredSessionState) {
+  const { userId, sessionId, sessionIndex } = state;
+  await AsyncStorage.setItem(`snowplow_${namespace}_session`, JSON.stringify({ userId, sessionId, sessionIndex }));
+}
+
+async function resumeStoredSession(namespace: string): Promise<SessionState> {
+  const storedState = await AsyncStorage.getItem(`snowplow_${namespace}_session`);
+  if (storedState) {
+    const state = JSON.parse(storedState) as StoredSessionState;
+    return {
+      userId: state.userId,
+      sessionId: uuidv4(),
+      previousSessionId: state.sessionId,
+      sessionIndex: state.sessionIndex + 1,
+      storageMechanism: 'LOCAL_STORAGE',
+    };
+  } else {
+    return {
+      userId: uuidv4(),
+      sessionId: uuidv4(),
+      sessionIndex: 1,
+      storageMechanism: 'LOCAL_STORAGE',
+    };
+  }
+}
+
+/**
+ * Creates a new session plugin for tracking the session information.
+ * The plugin will add the session context to all events and start a new session if the current one has timed out.
+ * 
+ * The session state is stored in AsyncStorage.
+ * Each restart of the app or creation of a new tracker instance will trigger a new session with reference to the previous session.
+ */
+export async function newSessionPlugin({
+  namespace,
+  foregroundSessionTimeout,
+  backgroundSessionTimeout,
+}: TrackerConfiguration & SessionConfiguration): Promise<SessionPlugin> {
+  let sessionState = await resumeStoredSession(namespace);
+  await storeSessionState(namespace, sessionState);
+
+  let inBackground = false;
+  let lastUpdateTs = new Date().getTime();
+
+  const startNewSession = async () => {
+    sessionState = {
+      userId: sessionState.userId,
+      storageMechanism: sessionState.storageMechanism,
+      sessionId: uuidv4(),
+      sessionIndex: sessionState.sessionIndex + 1,
+      previousSessionId: sessionState.sessionId,
+    };
+  };
+
+  const getTimeoutMs = () => {
+    return ((inBackground ? backgroundSessionTimeout : foregroundSessionTimeout) ?? 30 * 60) * 1000;
+  };
+
+  const beforeTrack = (payloadBuilder: PayloadBuilder) => {
+    // check if session has timed out and start a new one if necessary
+    const now = new Date();
+    const timeDiff = now.getTime() - lastUpdateTs;
+    if (timeDiff > getTimeoutMs()) {
+      startNewSession();
+      storeSessionState(namespace, sessionState);
+    }
+    lastUpdateTs = now.getTime();
+
+    // update event properties
+    sessionState.eventIndex = (sessionState.eventIndex ?? 0) + 1;
+    if (sessionState.eventIndex === 1) {
+      sessionState.firstEventId = payloadBuilder.getPayload().eid as string;
+      sessionState.firstEventTimestamp = now.toISOString();
+    }
+
+    // update background state
+    if (payloadBuilder.getPayload().e === 'ue') {
+      const schema = getUsefulSchema(payloadBuilder);
+      if (schema === FOREGROUND_EVENT_SCHEMA) {
+        inBackground = false;
+      } else if (schema === BACKGROUND_EVENT_SCHEMA) {
+        inBackground = true;
+      }
+    }
+
+    // add session context to the payload
+    payloadBuilder.addContextEntity({
+      schema: CLIENT_SESSION_ENTITY_SCHEMA,
+      data: { ...sessionState },
+    });
+  };
+
+  return {
+    getSessionUserId: () => Promise.resolve(sessionState.userId),
+    getSessionId: () => Promise.resolve(sessionState.sessionId),
+    getSessionIndex: () => Promise.resolve(sessionState.sessionIndex),
+    getSessionState: () => Promise.resolve(sessionState),
+    startNewSession,
+    plugin: {
+      beforeTrack,
+    },
+  };
+}