Check for mixed SDK versions (#4270)

* Check for mixed SDK versions

* Format code

* format + api

---------

Co-authored-by: Sentry Github Bot <bot+github-bot@sentry.io>

Author: adinauer

sentry/api/sentry.api

@@ -2867,6 +2867,7 @@ public final class io/sentry/SentryInstantDateProvider : io/sentry/SentryDatePro
 public final class io/sentry/SentryIntegrationPackageStorage {
 	public fun addIntegration (Ljava/lang/String;)V
 	public fun addPackage (Ljava/lang/String;Ljava/lang/String;)V
+	public fun checkForMixedVersions (Lio/sentry/ILogger;)Z
 	public fun clearStorage ()V
 	public static fun getInstance ()Lio/sentry/SentryIntegrationPackageStorage;
 	public fun getIntegrations ()Ljava/util/Set;

sentry/src/main/java/io/sentry/SentryClient.java

@@ -767,6 +767,9 @@ public void captureSession(final @NotNull Session session, final @Nullable Hint
             .log(SentryLevel.ERROR, "The BeforeEnvelope callback threw an exception.", e);
       }
     }
+
+    SentryIntegrationPackageStorage.getInstance().checkForMixedVersions(options.getLogger());
+
     if (hint == null) {
       transport.send(envelope);
     } else {

sentry/src/main/java/io/sentry/SentryIntegrationPackageStorage.java

@@ -15,6 +15,9 @@ public final class SentryIntegrationPackageStorage {
   private static volatile @Nullable SentryIntegrationPackageStorage INSTANCE;
   private static final @NotNull AutoClosableReentrantLock staticLock =
       new AutoClosableReentrantLock();
+  private static volatile @Nullable Boolean mixedVersionsDetected = null;
+  private static final @NotNull AutoClosableReentrantLock mixedVersionsLock =
+      new AutoClosableReentrantLock();
 
   public static @NotNull SentryIntegrationPackageStorage getInstance() {
     if (INSTANCE == null) {
@@ -64,12 +67,48 @@ public void addPackage(final @NotNull String name, final @NotNull String version
 
     SentryPackage newPackage = new SentryPackage(name, version);
     packages.add(newPackage);
+    try (final @NotNull ISentryLifecycleToken ignored = mixedVersionsLock.acquire()) {
+      mixedVersionsDetected = null;
+    }
   }
 
   public @NotNull Set<SentryPackage> getPackages() {
     return packages;
   }
 
+  public boolean checkForMixedVersions(final @NotNull ILogger logger) {
+    final @Nullable Boolean mixedVersionsDetectedBefore = mixedVersionsDetected;
+    if (mixedVersionsDetectedBefore != null) {
+      return mixedVersionsDetectedBefore;
+    }
+    try (final @NotNull ISentryLifecycleToken ignored = mixedVersionsLock.acquire()) {
+      final @NotNull String sdkVersion = BuildConfig.VERSION_NAME;
+      boolean mixedVersionsDetectedThisCheck = false;
+
+      for (SentryPackage pkg : packages) {
+        if (pkg.getName().startsWith("maven:io.sentry:")
+            && !sdkVersion.equalsIgnoreCase(pkg.getVersion())) {
+          logger.log(
+              SentryLevel.ERROR,
+              "The Sentry SDK has been configured with mixed versions. Expected %s to match core SDK version %s but was %s",
+              pkg.getName(),
+              sdkVersion,
+              pkg.getVersion());
+          mixedVersionsDetectedThisCheck = true;
+        }
+      }
+
+      if (mixedVersionsDetectedThisCheck) {
+        logger.log(SentryLevel.ERROR, "^^^^^^^^^^^^^^^^^^^^^^^^^^^^");
+        logger.log(SentryLevel.ERROR, "^^^^^^^^^^^^^^^^^^^^^^^^^^^^");
+        logger.log(SentryLevel.ERROR, "^^^^^^^^^^^^^^^^^^^^^^^^^^^^");
+        logger.log(SentryLevel.ERROR, "^^^^^^^^^^^^^^^^^^^^^^^^^^^^");
+      }
+      mixedVersionsDetected = mixedVersionsDetectedThisCheck;
+      return mixedVersionsDetectedThisCheck;
+    }
+  }
+
   @TestOnly
   public void clearStorage() {
     integrations.clear();