Added old spec support in splitfetcher

client/src/main/java/io/split/client/HttpSplitChangeFetcher.java

@@ -2,8 +2,13 @@
 
 import com.google.common.annotations.VisibleForTesting;
 
+import io.split.Spec;
 import io.split.client.dtos.SplitChange;
 import io.split.client.dtos.SplitHttpResponse;
+import io.split.client.dtos.RuleBasedSegment;
+import io.split.client.dtos.SplitChangesOldPayloadDto;
+import io.split.client.dtos.ChangeDto;
+import io.split.client.dtos.Split;
 import io.split.client.exceptions.UriTooLongException;
 import io.split.client.utils.Json;
 import io.split.client.utils.Utils;
@@ -20,35 +25,44 @@
 
 import java.net.URI;
 import java.net.URISyntaxException;
+import java.util.ArrayList;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 import static io.split.Spec.SPEC_VERSION;
+import static io.split.Spec.SPEC_1_3;
+import static io.split.Spec.SPEC_1_1;
 
 /**
  * Created by adilaijaz on 5/30/15.
  */
 public final class HttpSplitChangeFetcher implements SplitChangeFetcher {
     private static final Logger _log = LoggerFactory.getLogger(HttpSplitChangeFetcher.class);
 
+    private final Object _lock = new Object();
     private static final String SINCE = "since";
     private static final String RB_SINCE = "rbSince";
     private static final String TILL = "till";
     private static final String SETS = "sets";
     private static final String SPEC = "s";
+    private int PROXY_CHECK_INTERVAL_MILLISECONDS_SS =  24 * 60 * 60 * 1000;
+    private Long _lastProxyCheckTimestamp = 0L;
     private final SplitHttpClient _client;
     private final URI _target;
     private final TelemetryRuntimeProducer _telemetryRuntimeProducer;
+    private final boolean _rootURIOverriden;
 
-    public static HttpSplitChangeFetcher create(SplitHttpClient client, URI root, TelemetryRuntimeProducer telemetryRuntimeProducer)
+    public static HttpSplitChangeFetcher create(SplitHttpClient client, URI root, TelemetryRuntimeProducer telemetryRuntimeProducer,
+                                                boolean rootURIOverriden)
             throws URISyntaxException {
-        return new HttpSplitChangeFetcher(client, Utils.appendPath(root, "api/splitChanges"), telemetryRuntimeProducer);
+        return new HttpSplitChangeFetcher(client, Utils.appendPath(root, "api/splitChanges"), telemetryRuntimeProducer, rootURIOverriden);
     }
 
-    private HttpSplitChangeFetcher(SplitHttpClient client, URI uri, TelemetryRuntimeProducer telemetryRuntimeProducer) {
+    private HttpSplitChangeFetcher(SplitHttpClient client, URI uri, TelemetryRuntimeProducer telemetryRuntimeProducer, boolean rootURIOverriden) {
         _client = client;
         _target = uri;
         checkNotNull(_target);
         _telemetryRuntimeProducer = checkNotNull(telemetryRuntimeProducer);
+        _rootURIOverriden = rootURIOverriden;
     }
 
     long makeRandomTill() {
@@ -59,27 +73,62 @@ long makeRandomTill() {
     @Override
     public SplitChange fetch(long since, long sinceRBS, FetchOptions options) {
         long start = System.currentTimeMillis();
+        SplitHttpResponse response;
         try {
+            if (SPEC_VERSION.equals(SPEC_1_1) && (System.currentTimeMillis() - _lastProxyCheckTimestamp >= PROXY_CHECK_INTERVAL_MILLISECONDS_SS)) {
+                _log.info("Switching to new Feature flag spec ({}) and fetching.", SPEC_1_3);
+                SPEC_VERSION = SPEC_1_3;
+            }
             URI uri = buildURL(options, since, sinceRBS);
-            SplitHttpResponse response = _client.get(uri, options, null);
-
+            response = _client.get(uri, options, null);
             if (response.statusCode() < HttpStatus.SC_OK || response.statusCode() >= HttpStatus.SC_MULTIPLE_CHOICES) {
                 if (response.statusCode() == HttpStatus.SC_REQUEST_URI_TOO_LONG) {
                     _log.error("The amount of flag sets provided are big causing uri length error.");
                     throw new UriTooLongException(String.format("Status code: %s. Message: %s", response.statusCode(), response.statusMessage()));
                 }
 
+                if (response.statusCode() == HttpStatus.SC_BAD_REQUEST && SPEC_VERSION.equals(Spec.SPEC_1_3) && _rootURIOverriden) {
+                    SPEC_VERSION = Spec.SPEC_1_1;
+                    _log.warn("Detected proxy without support for Feature flags spec {} version, will switch to spec version {}",
+                            SPEC_1_3, SPEC_1_1);
+                    _lastProxyCheckTimestamp = System.currentTimeMillis();
+                    return fetch(since, sinceRBS, options);
+                }
+
                 _telemetryRuntimeProducer.recordSyncError(ResourceEnum.SPLIT_SYNC, response.statusCode());
                 throw new IllegalStateException(
                         String.format("Could not retrieve splitChanges since %s; http return code %s", since, response.statusCode())
                 );
             }
-            return Json.fromJson(response.body(), SplitChange.class);
         } catch (Exception e) {
             throw new IllegalStateException(String.format("Problem fetching splitChanges since %s: %s", since, e), e);
         } finally {
             _telemetryRuntimeProducer.recordSyncLatency(HTTPLatenciesEnum.SPLITS, System.currentTimeMillis() - start);
         }
+
+        if (SPEC_VERSION.equals(Spec.SPEC_1_1)) {
+            return Json.fromJson(body, SplitChangesOldPayloadDto.class).toSplitChange();
+        }
+
+        return Json.fromJson(response.body(), SplitChange.class);
+    }
+
+    public Long getLastProxyCheckTimestamp() {
+        return _lastProxyCheckTimestamp;
+    }
+
+    public void setLastProxyCheckTimestamp(long lastProxyCheckTimestamp) {
+        synchronized (_lock) {
+            _lastProxyCheckTimestamp = lastProxyCheckTimestamp;
+        }
+    }
+
+    private ChangeDto<RuleBasedSegment> createEmptyDTO() {
+        ChangeDto<RuleBasedSegment> dto = new ChangeDto<>();
+        dto.d = new ArrayList<>();
+        dto.t = -1;
+        dto.s = -1;
+        return dto;
     }
 
     private URI buildURL(FetchOptions options, long since, long sinceRBS) throws URISyntaxException {

client/src/main/java/io/split/client/SplitClientConfig.java

@@ -412,6 +412,10 @@ public CustomHeaderDecorator customHeaderDecorator() {
         return _customHeaderDecorator;
     }
 
+    public boolean isSdkEndpointOverridden() {
+        return !_endpoint.equals(SDK_ENDPOINT);
+    }
+
     public CustomHttpModule alternativeHTTPModule() { return _alternativeHTTPModule; }
     public static final class Builder {
 

client/src/main/java/io/split/client/SplitFactoryImpl.java

@@ -225,7 +225,7 @@ public SplitFactoryImpl(String apiToken, SplitClientConfig config) throws URISyn
         RuleBasedSegmentParser ruleBasedSegmentParser = new RuleBasedSegmentParser();
         // SplitFetcher
         _splitFetcher = buildSplitFetcher(splitCache, splitParser, flagSetsFilter,
-                ruleBasedSegmentParser, ruleBasedSegmentCache);
+                ruleBasedSegmentParser, ruleBasedSegmentCache, config.isRootURIOverriden());
 
         // SplitSynchronizationTask
         _splitSynchronizationTask = new SplitSynchronizationTask(_splitFetcher,
@@ -623,9 +623,9 @@ private SegmentSynchronizationTaskImp buildSegments(SplitClientConfig config,
 
     private SplitFetcher buildSplitFetcher(SplitCacheProducer splitCacheProducer, SplitParser splitParser,
             FlagSetsFilter flagSetsFilter, RuleBasedSegmentParser ruleBasedSegmentParser,
-           RuleBasedSegmentCacheProducer ruleBasedSegmentCache) throws URISyntaxException {
+           RuleBasedSegmentCacheProducer ruleBasedSegmentCache, boolean isRootURIOverriden) throws URISyntaxException {
         SplitChangeFetcher splitChangeFetcher = HttpSplitChangeFetcher.create(_splitHttpClient, _rootTarget,
-                _telemetryStorageProducer);
+                _telemetryStorageProducer, isRootURIOverriden);
         return new SplitFetcherImp(splitChangeFetcher, splitParser, splitCacheProducer, _telemetryStorageProducer,
                 flagSetsFilter, ruleBasedSegmentParser, ruleBasedSegmentCache);
     }

client/src/main/java/io/split/client/dtos/SplitChangesOldPayloadDto.java

@@ -0,0 +1,33 @@
+package io.split.client.dtos;
+
+import com.google.gson.annotations.SerializedName;
+
+import java.util.List;
+
+public class SplitChangesOldPayloadDto {
+    @SerializedName("since")
+    public long s;
+
+    @SerializedName("till")
+    public long t;
+
+    @SerializedName("splits")
+    public List<Split> d;
+
+    public SplitChange toSplitChange() {
+        SplitChange splitChange = new SplitChange();
+        ChangeDto<Split> ff = new ChangeDto<>();
+        ff.s = this.s;
+        ff.t = this.t;
+        ff.d = this.d;
+        ChangeDto<RuleBasedSegment> rbs = new ChangeDto<>();
+        rbs.d = new ArrayList<>();
+        rbs.t = -1;
+        rbs.s = -1;
+
+        splitChange.ff = ff;
+        splitChange.rbs = rbs;
+
+        return splitChange;
+    }
+}