/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
namespace java org.apache.distributedlog.thrift.service

/* Response stats codes */
enum StatusCode {
    /* 2xx: action requested by the client was received, understood, accepted and processed successfully. */

    /* standard response for successful requests. */
    SUCCESS = 200,

    /* 3xx: client must take additional action to complete the request. */

    /* client closed. */
    CLIENT_CLOSED = 301,
    /* found the stream in a different server, a redirection is required by client. */
    FOUND = 302,

    /* 4xx: client seems to have erred. */

    /* request is denied for some reason */
    REQUEST_DENIED = 403,
    /* request record too large */
    TOO_LARGE_RECORD = 413,

    /* 5xx: server failed to fulfill an apparently valid request. */

    /* Generic error message, given when no more specific message is suitable. */
    INTERNAL_SERVER_ERROR = 500,
    /* Not implemented */
    NOT_IMPLEMENTED = 501,
    /* Already Closed Exception */
    ALREADY_CLOSED = 502,
    /* Service is currently unavailable (because it is overloaded or down for maintenance). */
    SERVICE_UNAVAILABLE = 503,
    /* Locking exception */
    LOCKING_EXCEPTION = 504,
    /* ZooKeeper Errors */
    ZOOKEEPER_ERROR = 505,
    /* Metadata exception */
    METADATA_EXCEPTION = 506,
    /* BK Transmit Error */
    BK_TRANSMIT_ERROR = 507,
    /* Flush timeout */
    FLUSH_TIMEOUT = 508,
    /* Log empty */
    LOG_EMPTY = 509,
    /* Log not found */
    LOG_NOT_FOUND = 510,
    /* Truncated Transactions */
    TRUNCATED_TRANSACTION = 511,
    /* End of Stream */
    END_OF_STREAM = 512,
    /* Transaction Id Out of Order */
    TRANSACTION_OUT_OF_ORDER = 513,
    /* Write exception */
    WRITE_EXCEPTION = 514,
    /* Stream Unavailable */
    STREAM_UNAVAILABLE = 515,
    /* Write cancelled exception */
    WRITE_CANCELLED_EXCEPTION = 516,
    /* over-capacity/backpressure */
    OVER_CAPACITY = 517,
    /** stream exists but is not ready (recovering etc.).
        the difference between NOT_READY and UNAVAILABLE is that UNAVAILABLE
        indicates the stream is no longer owned by the proxy and we should
        redirect. NOT_READY indicates the stream exist at the proxy but isn't
        eady for writes. */
    STREAM_NOT_READY = 518,
    /* Region Unavailable */
    REGION_UNAVAILABLE = 519,
    /* Invalid Enveloped Entry */
    INVALID_ENVELOPED_ENTRY = 520,
    /* Unsupported metadata version */
    UNSUPPORTED_METADATA_VERSION = 521,
    /* Log Already Exists */
    LOG_EXISTS = 522,
    /* Checksum failed on the request */
    CHECKSUM_FAILED = 523,
    /* Overcapacity: too many streams */
    TOO_MANY_STREAMS = 524,
    /* Log Segment Not Found */
    LOG_SEGMENT_NOT_FOUND = 525,
    // End of Log Segment
    END_OF_LOG_SEGMENT = 526,
    // Log Segment Is Truncated
    LOG_SEGMENT_IS_TRUNCATED = 527,

    /* 6xx: unexpected */

    UNEXPECTED = 600,
    INTERRUPTED = 601,
    INVALID_STREAM_NAME = 602,
    ILLEGAL_STATE = 603,

    /* 10xx: reader exceptions */

    RETRYABLE_READ = 1000,
    LOG_READ_ERROR = 1001,
    /* Read cancelled exception */
    READ_CANCELLED_EXCEPTION = 1002,
}

/* Response Header */
struct ResponseHeader {
    1: required StatusCode code;
    2: optional string errMsg;
    3: optional string location;
}

/* Write Response */
struct WriteResponse {
    1: required ResponseHeader header;
    2: optional string dlsn;
}

/* Bulk write response */
struct BulkWriteResponse {
    1: required ResponseHeader header;
    2: optional list<WriteResponse> writeResponses;
}

/* Write Context */
struct WriteContext {
    1: optional set<string> triedHosts;
    2: optional i64 crc32;
    3: optional bool isRecordSet;
}

/* HeartBeat Options */
struct HeartbeatOptions {
    1: optional bool sendHeartBeatToReader;
}

/* Server Status */
enum ServerStatus {
    /* service is writing and accepting new streams */
    WRITE_AND_ACCEPT    = 100,
    /* service is only writing to old streams, not accepting new streams */
    WRITE_ONLY          = 200,
    /* service is shutting down, will not write */
    DOWN                = 300,
}

/* Server Info */
struct ServerInfo {
    1: optional map<string, string> ownerships;
    2: optional ServerStatus serverStatus;
}

/* Client Info */
struct ClientInfo {
    1: optional string streamNameRegex;
    2: optional bool getOwnerships;
}

service DistributedLogService {

    /* Deprecated */
    ServerInfo handshake();

    ServerInfo handshakeWithClientInfo(ClientInfo clientInfo);

    /* Deprecated */
    WriteResponse heartbeat(string stream, WriteContext ctx);

    WriteResponse heartbeatWithOptions(string stream, WriteContext ctx, HeartbeatOptions options);

    /* Deprecated */
    WriteResponse write(string stream, binary data);

    WriteResponse writeWithContext(string stream, binary data, WriteContext ctx);

    BulkWriteResponse writeBulkWithContext(string stream, list<binary> data, WriteContext ctx);

    WriteResponse truncate(string stream, string dlsn, WriteContext ctx);

    WriteResponse release(string stream, WriteContext ctx);

    WriteResponse create(string stream, WriteContext ctx);

    WriteResponse delete(string stream, WriteContext ctx);

    WriteResponse getOwner(string stream, WriteContext ctx);

    /* Admin Methods */
    void setAcceptNewStream(bool enabled);
}