Imported Upstream version 1.5.1
This commit is contained in:
Mario Fetka
244
cpp/include/xtfsutil/xtfsutil_server.h
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244
cpp/include/xtfsutil/xtfsutil_server.h
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/*
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* Copyright (c) 2011 by Bjoern Kolbeck, Zuse Institute Berlin
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*
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* Licensed under the BSD License, see LICENSE file for details.
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*
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*/
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#ifndef CPP_INCLUDE_XTFSUTIL_XTFSUTIL_SERVER_H_
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#define CPP_INCLUDE_XTFSUTIL_XTFSUTIL_SERVER_H_
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <boost/thread/mutex.hpp>
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#include <map>
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#include <string>
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#include "json/json-forwards.h"
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#include "pbrpc/RPC.pb.h"
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#ifdef WIN32
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typedef unsigned int uid_t;
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typedef unsigned int gid_t;
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#endif // WIN32
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namespace xtreemfs {
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class Client;
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class Volume;
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/** Handle for a xcntl pseudo file used to communicate with
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* the xtfsutil server inside the client.
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*/
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class XCtlFile {
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public:
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XCtlFile() : in_use_(false), last_result_(), uid_(0), gid_(0) {}
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void set_last_result(std::string _last_result) {
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this->last_result_ = _last_result;
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}
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std::string last_result() const {
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return last_result_;
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}
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void set_in_use(bool _in_use) {
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this->in_use_ = _in_use;
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}
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bool in_use() const {
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return in_use_;
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}
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void set_user(uid_t uid, gid_t gid) {
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uid_ = uid;
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gid_ = gid;
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}
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bool is_owner(uid_t uid, gid_t gid) {
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// Always allow root to read all files.
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// Required for APPLE.
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return (uid == 0 && gid == 0)
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|| (uid == uid_ && gid == gid_);
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}
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uid_t get_uid() const {
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return uid_;
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}
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gid_t get_gid() const {
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return gid_;
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}
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private:
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/** True, if an operation is currently being executed for this file. */
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volatile bool in_use_;
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/** Result of last operation executed, encoded in JSON. */
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std::string last_result_;
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/** User who owns this file. */
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uid_t uid_;
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gid_t gid_;
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};
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/** part of the xtfsutil that runs in the client (FUSE...)
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* and handles all requests from the xtfsutil tool.
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* xtfsutil uses special files to communicate with the client
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* commands are executed using write and results are obtained via read.
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* A write will block until the operation has finished.
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*/
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class XtfsUtilServer {
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public:
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/** @param prefix is the path prefix used to identify xctl pseudo files. */
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XtfsUtilServer(const std::string& prefix);
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~XtfsUtilServer();
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/** Sets the volume to be used. */
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void set_volume(Volume* volume);
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/** Sets the Client to be used. */
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void set_client(Client* uuid_resolver);
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/** Returns true, if the path points to a xctl pseudo file. */
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bool checkXctlFile(const std::string& path);
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/** Reads the last response into buf.
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* @returns 0 on success, -1*errno otherwise.
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*/
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int read(uid_t uid,
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gid_t gid,
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const std::string& path,
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char *buf,
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size_t size,
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off_t offset);
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/** Parses and executes the command from buf.
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* @returns 0 on success, -1*errno otherwise.
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*/
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int write(uid_t uid,
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gid_t gid,
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const xtreemfs::pbrpc::UserCredentials& uc,
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const std::string& path,
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const char* buf,
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size_t size);
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/** Stats a xctl pseudo file. */
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int getattr(uid_t uid,
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gid_t gid,
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const std::string& path,
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struct stat* st_buf);
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/** Delets a xctl pseudo file. */
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int unlink(uid_t uid,
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gid_t gid,
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const std::string& path);
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/** Creates a xctl pseudo file. */
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int create(uid_t uid,
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gid_t gid,
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const std::string& path);
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private:
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/** Retrieves the file from the internal map. Creates it if it doesn't exist
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* and create is true.
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* @returns the file or NULL if the file does not exist or is owned by another
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* user.
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*/
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XCtlFile* FindFile(uid_t uid,
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gid_t gid,
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const std::string& path,
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bool create);
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/** Parses the input JSON and executes the operation.
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* Stores the result in file.
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*/
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void ParseAndExecute(const xtreemfs::pbrpc::UserCredentials& uc,
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const std::string& input_str,
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XCtlFile* file);
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/** Returns a list of errors. */
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void OpGetErrors(const xtreemfs::pbrpc::UserCredentials& uc,
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const Json::Value& input,
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Json::Value* output);
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/** Returns XtreemFS-specific attributes. */
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void OpStat(const xtreemfs::pbrpc::UserCredentials& uc,
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const Json::Value& input,
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Json::Value* output);
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/** Changes the default striping policy. Volumes only. */
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void OpSetDefaultSP(const xtreemfs::pbrpc::UserCredentials& uc,
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const Json::Value& input,
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Json::Value* output);
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/** Changes the default replication policy. Volumes only. */
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void OpSetDefaultRP(const xtreemfs::pbrpc::UserCredentials& uc,
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const Json::Value& input,
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Json::Value* output);
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/** Changes the OSD selection policy (OSP). Volume only. */
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void OpSetOSP(const xtreemfs::pbrpc::UserCredentials& uc,
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const Json::Value& input,
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Json::Value* output);
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/** Changes the Replica selection policy (RSP). Volume only. */
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void OpSetRSP(const xtreemfs::pbrpc::UserCredentials& uc,
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const Json::Value& input,
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Json::Value* output);
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void OpSetReplicationPolicy(const xtreemfs::pbrpc::UserCredentials& uc,
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const Json::Value& input,
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Json::Value* output);
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void OpAddReplica(const xtreemfs::pbrpc::UserCredentials& uc,
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const Json::Value& input,
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Json::Value* output);
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void OpRemoveReplica(const xtreemfs::pbrpc::UserCredentials& uc,
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const Json::Value& input,
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Json::Value* output);
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void OpGetSuitableOSDs(const xtreemfs::pbrpc::UserCredentials& uc,
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const Json::Value& input,
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Json::Value* output);
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void OpSetPolicyAttr(const xtreemfs::pbrpc::UserCredentials& uc,
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const Json::Value& input,
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Json::Value* output);
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void OpListPolicyAttr(const xtreemfs::pbrpc::UserCredentials& uc,
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const Json::Value& input,
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Json::Value* output);
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void OpEnableDisableSnapshots(const xtreemfs::pbrpc::UserCredentials& uc,
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const Json::Value& input,
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Json::Value* output);
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void OpListSnapshots(const xtreemfs::pbrpc::UserCredentials& uc,
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const Json::Value& input,
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Json::Value* output);
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void OpCreateDeleteSnapshot(const xtreemfs::pbrpc::UserCredentials& uc,
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const Json::Value& input,
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Json::Value* output);
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void OpSetRemoveACL(const xtreemfs::pbrpc::UserCredentials& uc,
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const Json::Value& input,
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Json::Value* output);
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void OpSetVolumeQuota(const xtreemfs::pbrpc::UserCredentials& uc,
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const Json::Value& input,
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Json::Value* output);
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/** Mutex to protect xctl_files_. */
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boost::mutex xctl_files_mutex_;
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/** Map of xctl pseudo files. */
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std::map<std::string, XCtlFile*> xctl_files_;
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/** Path prefix. */
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std::string prefix_;
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/** Volume on which to execute operations. */
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Volume* volume_;
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/** Client to resolve UUIDs to addresses. */
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Client* client_;
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/** XAttr prefix used for Policy Attribute names by the MRC. */
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const std::string xtreemfs_policies_prefix_;
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};
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} // namespace xtreemfs
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#endif // CPP_INCLUDE_XTFSUTIL_XTFSUTIL_SERVER_H_
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