1 files changed, 138 insertions, 0 deletions
diff --git a/configserver-flags/src/main/java/com/yahoo/vespa/configserver/flags/http/FlagsHandler.java b/configserver-flags/src/main/java/com/yahoo/vespa/configserver/flags/http/FlagsHandler.java
new file mode 100644
index 00000000000..40bb69111e0
--- /dev/null
+++ b/configserver-flags/src/main/java/com/yahoo/vespa/configserver/flags/http/FlagsHandler.java
@@ -0,0 +1,138 @@
+// Copyright 2018 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.vespa.configserver.flags.http;
+
+import com.google.inject.Inject;
+import com.yahoo.container.jdisc.HttpRequest;
+import com.yahoo.container.jdisc.HttpResponse;
+import com.yahoo.container.jdisc.LoggingRequestHandler;
+import com.yahoo.log.LogLevel;
+import com.yahoo.restapi.Path;
+import com.yahoo.vespa.configserver.flags.FlagsDb;
+import com.yahoo.vespa.flags.FlagDefinition;
+import com.yahoo.vespa.flags.FlagId;
+import com.yahoo.vespa.flags.Flags;
+import com.yahoo.vespa.flags.json.FlagData;
+import com.yahoo.yolean.Exceptions;
+
+import java.io.UncheckedIOException;
+import java.net.URI;
+import java.util.Objects;
+
+/**
+ * Handles /flags/v1 requests
+ *
+ * @author hakonhall
+ */
+public class FlagsHandler extends LoggingRequestHandler {
+
+    private final FlagsDb flagsDb;
+
+    @Inject
+    public FlagsHandler(LoggingRequestHandler.Context context, FlagsDb flagsDb) {
+        super(context);
+        this.flagsDb = flagsDb;
+    }
+
+    @Override
+    public HttpResponse handle(HttpRequest request) {
+        try {
+            switch (request.getMethod()) {
+                case GET: return handleGET(request);
+                case DELETE: return handleDELETE(request);
+                case PUT: return handlePUT(request);
+                default: return ErrorResponse.methodNotAllowed("Method '" + request.getMethod() + "' is not supported");
+            }
+        }
+        catch (IllegalArgumentException e) {
+            return ErrorResponse.badRequest(Exceptions.toMessageString(e));
+        }
+        catch (RuntimeException e) {
+            log.log(LogLevel.WARNING, "Unexpected error handling '" + request.getUri() + "'", e);
+            return ErrorResponse.internalServerError(Exceptions.toMessageString(e));
+        }
+    }
+
+    private HttpResponse handleGET(HttpRequest request) {
+        Path path = new Path(request.getUri());
+        if (path.matches("/flags/v1")) return new V1Response(flagsV1Uri(request), "data", "defined");
+        if (path.matches("/flags/v1/data")) return getFlagDataList(request);
+        if (path.matches("/flags/v1/data/{flagId}")) return getFlagData(findFlagId(request, path));
+        if (path.matches("/flags/v1/defined")) return new DefinedFlags(Flags.getAllFlags());
+        if (path.matches("/flags/v1/defined/{flagId}")) return getDefinedFlag(findFlagId(request, path));
+        return ErrorResponse.notFoundError("Nothing at path '" + path + "'");
+    }
+
+    private HttpResponse handlePUT(HttpRequest request) {
+        Path path = new Path(request.getUri());
+        if (path.matches("/flags/v1/data/{flagId}")) return putFlagData(request, findFlagId(request, path));
+        return ErrorResponse.notFoundError("Nothing at path '" + path + "'");
+    }
+
+    private HttpResponse handleDELETE(HttpRequest request) {
+        Path path = new Path(request.getUri());
+        if (path.matches("/flags/v1/data/{flagId}")) return deleteFlagData(findFlagId(request, path));
+        return ErrorResponse.notFoundError("Nothing at path '" + path + "'");
+    }
+
+    private String flagsV1Uri(HttpRequest request) {
+        URI uri = request.getUri();
+        String port = uri.getPort() < 0 ? "" : ":" + uri.getPort();
+        return uri.getScheme() + "://" + uri.getHost() + port + "/flags/v1";
+    }
+
+    private HttpResponse getDefinedFlag(FlagId flagId) {
+        var definedFlag = Flags.getFlag(flagId).map(DefinedFlag::new);
+        if (definedFlag.isPresent()) {
+            return definedFlag.get();
+        }
+        return ErrorResponse.notFoundError("Flag " + flagId + " not defined");
+    }
+
+    private HttpResponse getFlagDataList(HttpRequest request) {
+        return new FlagDataListResponse(flagsV1Uri(request), flagsDb.getAllFlags(),
+                                        Objects.equals(request.getProperty("recursive"), "true"));
+    }
+
+    private HttpResponse getFlagData(FlagId flagId) {
+        var data = flagsDb.getValue(flagId).map(FlagDataResponse::new);
+        if (data.isPresent()) {
+            return data.get();
+        }
+        return ErrorResponse.notFoundError("Flag " + flagId + " not set");
+    }
+
+    private HttpResponse putFlagData(HttpRequest request, FlagId flagId) {
+        FlagData data;
+        try {
+            data = FlagData.deserialize(request.getData());
+        } catch (UncheckedIOException e) {
+            return ErrorResponse.badRequest("Failed to deserialize request data: " + Exceptions.toMessageString(e));
+        }
+
+        if (!isForce(request)) {
+            FlagDefinition definition = Flags.getFlag(flagId).get(); // FlagId has been validated in findFlagId()
+            data.validate(definition.getUnboundFlag().serializer());
+        }
+
+        flagsDb.setValue(flagId, data);
+        return new OKResponse();
+    }
+
+    private HttpResponse deleteFlagData(FlagId flagId) {
+        flagsDb.removeValue(flagId);
+        return new OKResponse();
+    }
+
+    private FlagId findFlagId(HttpRequest request, Path path) {
+        FlagId flagId = new FlagId(path.get("flagId"));
+        if (!isForce(request) && Flags.getFlag(flagId).isEmpty()) {
+            throw new IllegalArgumentException("There is no flag '" + flagId + "' (use ?force=true to override)");
+        }
+        return flagId;
+    }
+
+    private boolean isForce(HttpRequest request) {
+        return Objects.equals(request.getProperty("force"), "true");
+    }
+
+}