]>
Commit | Line | Data |
---|---|---|
7c673cae FG |
1 | /* |
2 | * Ceph - scalable distributed file system | |
3 | * | |
4 | * This is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU Lesser General Public | |
6 | * License version 2.1, as published by the Free Software | |
7 | * Foundation. See file COPYING. | |
8 | * | |
9 | * Copyright 2013 Inktank | |
10 | */ | |
11 | ||
12 | #ifndef CLS_REPLICA_LOG_TYPES_H_ | |
13 | #define CLS_REPLICA_LOG_TYPES_H_ | |
14 | ||
15 | #include "include/utime.h" | |
16 | #include "include/encoding.h" | |
17 | #include "include/types.h" | |
18 | #include <errno.h> | |
19 | ||
20 | class JSONObj; | |
21 | ||
22 | struct cls_replica_log_item_marker { | |
23 | string item_name; // the name of the item we're marking | |
24 | utime_t item_timestamp; // the time stamp at which the item was outdated | |
25 | ||
26 | cls_replica_log_item_marker() {} | |
27 | cls_replica_log_item_marker(const string& name, const utime_t& time) : | |
28 | item_name(name), item_timestamp(time) {} | |
29 | ||
30 | void encode(bufferlist& bl) const { | |
31 | ENCODE_START(1, 1, bl); | |
32 | ::encode(item_name, bl); | |
33 | ::encode(item_timestamp, bl); | |
34 | ENCODE_FINISH(bl); | |
35 | } | |
36 | ||
37 | void decode(bufferlist::iterator& bl) { | |
38 | DECODE_START(1, bl); | |
39 | ::decode(item_name, bl); | |
40 | ::decode(item_timestamp, bl); | |
41 | DECODE_FINISH(bl); | |
42 | } | |
43 | ||
44 | void dump(Formatter *f) const; | |
45 | void decode_json(JSONObj *obj); | |
46 | static void generate_test_instances(std::list<cls_replica_log_item_marker*>& ls); | |
47 | }; | |
48 | WRITE_CLASS_ENCODER(cls_replica_log_item_marker) | |
49 | ||
50 | struct cls_replica_log_progress_marker { | |
51 | string entity_id; // the name of the entity setting the progress marker | |
52 | string position_marker; // represents a log listing position on the master | |
53 | utime_t position_time; // the timestamp associated with the position marker | |
54 | std::list<cls_replica_log_item_marker> items; /* any items not caught up | |
55 | to the position marker*/ | |
56 | ||
57 | cls_replica_log_progress_marker() {} | |
58 | cls_replica_log_progress_marker(const string& entity, const string& marker, | |
59 | const utime_t& time ) : | |
60 | entity_id(entity), position_marker(marker), | |
61 | position_time(time) {} | |
62 | cls_replica_log_progress_marker(const string& entity, const string& marker, | |
63 | const utime_t& time, | |
64 | const std::list<cls_replica_log_item_marker>& b) : | |
65 | entity_id(entity), position_marker(marker), | |
66 | position_time(time), | |
67 | items(b) {} | |
68 | ||
69 | void encode(bufferlist& bl) const { | |
70 | ENCODE_START(1, 1, bl); | |
71 | ::encode(entity_id, bl); | |
72 | ::encode(position_marker, bl); | |
73 | ::encode(position_time, bl); | |
74 | ::encode(items, bl); | |
75 | ENCODE_FINISH(bl); | |
76 | } | |
77 | ||
78 | void decode(bufferlist::iterator& bl) { | |
79 | DECODE_START(1, bl); | |
80 | ::decode(entity_id, bl); | |
81 | ::decode(position_marker, bl); | |
82 | ::decode(position_time, bl); | |
83 | ::decode(items, bl); | |
84 | DECODE_FINISH(bl); | |
85 | } | |
86 | ||
87 | void dump(Formatter *f) const; | |
88 | void decode_json(JSONObj *obj); | |
89 | static void generate_test_instances(std::list<cls_replica_log_progress_marker*>& ls); | |
90 | }; | |
91 | WRITE_CLASS_ENCODER(cls_replica_log_progress_marker) | |
92 | ||
93 | class cls_replica_log_bound { | |
94 | /** | |
95 | * Right now, we are lazy and only support a single marker at a time. In the | |
96 | * future, we might support more than one, so the interface is designed to | |
97 | * let that work. | |
98 | */ | |
99 | string position_marker; // represents a log listing position on the master | |
100 | utime_t position_time; // the timestamp associated with the position marker | |
101 | bool marker_exists; // has the marker been set? | |
102 | cls_replica_log_progress_marker marker; // the status of the current locker | |
103 | ||
104 | public: | |
105 | cls_replica_log_bound() : marker_exists(false) {} | |
106 | ||
107 | int update_marker(const cls_replica_log_progress_marker& new_mark) { | |
108 | // only one marker at a time right now | |
109 | if (marker_exists && (marker.entity_id != new_mark.entity_id)) { | |
110 | return -EEXIST; | |
111 | } | |
112 | // can't go backwards with our one marker! | |
113 | if (marker_exists && (marker.position_time > new_mark.position_time)) { | |
114 | return -EINVAL; | |
115 | } | |
116 | ||
117 | marker = new_mark; | |
118 | position_marker = new_mark.position_marker; | |
119 | position_time = new_mark.position_time; | |
120 | marker_exists = true; | |
121 | // hey look, updating is idempotent; did you notice that? | |
122 | return 0; | |
123 | } | |
124 | ||
125 | int delete_marker(const string& entity_id) { | |
126 | if (marker_exists) { | |
127 | // ENOENT if our marker doesn't match the passed ID | |
128 | if (marker.entity_id != entity_id) { | |
129 | return -ENOENT; | |
130 | } | |
131 | // you can't delete it if there are unclean entries | |
132 | if (!marker.items.empty()) { | |
133 | return -ENOTEMPTY; | |
134 | } | |
135 | } | |
136 | ||
137 | marker_exists = false; | |
138 | marker = cls_replica_log_progress_marker(); | |
139 | // hey look, deletion is idempotent! Hurray. | |
140 | return 0; | |
141 | } | |
142 | ||
143 | std::string get_lowest_marker_bound() { | |
144 | return position_marker; | |
145 | } | |
146 | ||
147 | utime_t get_lowest_time_bound() { | |
148 | return position_time; | |
149 | } | |
150 | ||
151 | utime_t get_oldest_time() { | |
152 | utime_t oldest = position_time; | |
153 | list<cls_replica_log_item_marker>::const_iterator i; | |
154 | for ( i = marker.items.begin(); i != marker.items.end(); ++i) { | |
155 | if (i->item_timestamp < oldest) | |
156 | oldest = i->item_timestamp; | |
157 | } | |
158 | return oldest; | |
159 | } | |
160 | ||
161 | void get_markers(list<cls_replica_log_progress_marker>& ls) { | |
162 | if (marker_exists) { | |
163 | ls.push_back(marker); | |
164 | } | |
165 | } | |
166 | ||
167 | void encode(bufferlist& bl) const { | |
168 | ENCODE_START(1, 1, bl); | |
169 | ::encode(position_marker, bl); | |
170 | ::encode(position_time, bl); | |
171 | ::encode(marker_exists, bl); | |
172 | if (marker_exists) { | |
173 | ::encode(marker, bl); | |
174 | } | |
175 | ENCODE_FINISH(bl); | |
176 | } | |
177 | void decode(bufferlist::iterator& bl) { | |
178 | DECODE_START(1, bl); | |
179 | ::decode(position_marker, bl); | |
180 | ::decode(position_time, bl); | |
181 | ::decode(marker_exists, bl); | |
182 | if (marker_exists) { | |
183 | ::decode(marker, bl); | |
184 | } | |
185 | DECODE_FINISH(bl); | |
186 | } | |
187 | ||
188 | void dump(Formatter *f) const; | |
189 | void decode_json(JSONObj *obj); | |
190 | static void generate_test_instances(std::list<cls_replica_log_bound*>& ls); | |
191 | }; | |
192 | WRITE_CLASS_ENCODER(cls_replica_log_bound) | |
193 | ||
194 | #endif /* CLS_REPLICA_LOG_TYPES_H_ */ |