374 lines
8.4 KiB
Thrift
374 lines
8.4 KiB
Thrift
#!/usr/local/bin/thrift --gen cpp
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namespace java Tleveldb
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namespace cpp Tleveldb
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namespace rb Tleveldb
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namespace py Tleveldb
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namespace perl Tleveldb
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// Types
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typedef binary Text
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typedef binary Bytes
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// A basic object needed for storing keys and values
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struct Slice {
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1:Text data;
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2:i32 size
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}
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// Different compression types supported
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enum CompressionType {
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kNoCompression = 0x0,
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kSnappyCompression = 0x1
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}
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// Error codes
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enum Code {
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kOk = 0,
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kNotFound = 1,
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kCorruption = 2,
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kNotSupported = 3,
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kInvalidArgument = 4,
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kIOError = 5,
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kEnd = 6
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}
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// A range object
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struct Range {
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1:Slice start; // Included in the range
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2:Slice limit // Not included in the range
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}
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// Options to creating a database
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struct DBOptions {
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1:bool create_if_missing;
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2:bool error_if_exists;
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3:i32 write_buffer_size;
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4:i32 max_open_files;
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5:i32 block_size;
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6:i32 block_restart_interval;
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7:CompressionType compression
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}
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// Options for writing
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struct WriteOptions {
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1:bool sync
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}
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struct Snapshot {
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1:i64 snapshotid // server generated
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}
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// Options for reading. If you do not have a
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// snapshot, set snapshot.snapshotid = 0
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struct ReadOptions {
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1:bool verify_checksums;
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2:bool fill_cache,
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3:Snapshot snapshot
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}
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// Represents a database object
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struct DBHandle {
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1:Text dbname //name of the database
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}
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struct Iterator {
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1:i64 iteratorid // server generated
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}
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// flags for the iterator
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enum IteratorType {
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seekToFirst = 0,
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seekToLast = 1,
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seekToKey = 2
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}
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struct kv {
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1:Slice key;
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2:Slice value
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}
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// Return a single value from the Get call
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struct ResultItem {
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1:Code status;
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2:Slice value
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}
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// Return a key,value from a Scan call
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struct ResultPair {
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1:Code status;
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2:kv keyvalue
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}
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// Snapshot result
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struct ResultSnapshot {
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1:Code status;
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2:Snapshot snapshot
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}
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// Iterator result
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struct ResultIterator {
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1:Code status;
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2:Iterator iterator
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}
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exception LeveldbException {
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1:Text message,
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2:Code errorCode
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}
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// The Database service
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service DB {
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// opens the database. The database name cannot have "/"
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// in its name.
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DBHandle Open(1:Text dbname, 2:DBOptions dboptions)
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throws (1:LeveldbException se),
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// closes the database
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Code Close(1:DBHandle dbhandle, 2:Text dbname),
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// puts a key in the database
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Code Put(1:DBHandle dbhandle, 2:kv keyvalue, 3:WriteOptions options),
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// deletes a key from the database
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Code Delete(1:DBHandle dbhandle, 2:Slice key, 3:WriteOptions options),
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// writes batch of keys into the database
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Code Write(1:DBHandle dbhandle, 2:list<kv> batch, 3:WriteOptions options),
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// fetch a key from the DB.
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// ResultItem.status == kNotFound means key is non existant
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// ResultItem.status == kOk means key is found
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ResultItem Get(1:DBHandle dbhandle, 2:Slice inputkey,
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3:ReadOptions options),
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// start iteration over a set of keys. If iteratorType.seekToFirst
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// is set, then position the iterator at the first key in the source.
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// If iteratorType.seekToLast is set, then position at the last key in the
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// source. If iteratorType.seekToKey is set, then position at the first
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// key in the source that is at or past target.
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// If any two of iteratorType.seekToFirst & iteratorType.seekToLast
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// and iteratorType.seekToKey are set, then error.
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// If either iteratorType.seekToFirst or iteratorType.seekToLast is set,
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// then target is not used.
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ResultIterator NewIterator(1:DBHandle dbhandle, 2:ReadOptions options,
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3:IteratorType iteratorType,
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4:Slice target),
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// Release resources associated with an iterator allocated previously
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// via a call to NewIterator. The call to this method may be skipped
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// if the iterator had already traversed all the keys in the specified
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// range. If the application wants to terminate a scan before processing
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// all the resulting keys, then it is essential to invoke this method.
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Code DeleteIterator(1:DBHandle dbhandle, 2:Iterator iterator),
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// Return the previous/next from this iteration
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ResultPair GetNext(1:DBHandle dbhandle, 2:Iterator iterator),
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ResultPair GetPrev(1:DBHandle dbhandle, 2:Iterator iterator),
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// Create snapshot.
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ResultSnapshot GetSnapshot(1:DBHandle dbhandle),
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// Release snapshots
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Code ReleaseSnapshot(1:DBHandle dbhandle, 2:Snapshot snapshot),
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// compact a range of keys
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// begin.size == 0 to start at a range earlier than the first existing key
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// end.size == 0 to end at a range later than the last existing key
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Code CompactRange(1:DBHandle dbhandle, 2:Slice start, 3:Slice endhere),
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}
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// ****************** FACEBOOK specific stuff ********************
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//
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// An IOError exception from an assoc operation
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//
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exception IOError {
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1:string message
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}
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//
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// Visibility state for assoc
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//
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enum AssocVisibility
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{
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VISIBLE = 0, // live object, include in lookups and count
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DELETED = 1, // exclude from lookup queries and count, ok to
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// delete permanently from persistent store
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UNUSED1 = 2, // not used
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HIDDEN = 3, // exclude from lookup queries and count
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UNUSED2 = 4, // not used
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HARD_DELETE = 4 // deleted by calling expunge, will be swept
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// as soon as possible
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}
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/**
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* Holds the assoc get result of a id2
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*/
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struct TaoAssocGetResult {
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/** id2 of assoc */
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1:i64 id2,
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/** id1 type of assoc */
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2:i64 id1Type,
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/** id2 type of assoc */
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3:i64 id2Type,
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/** time stamp of the assoc */
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4:i64 time,
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/** version of the data blob */
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5:i64 dataVersion,
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/** serialized data of the asoc */
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6:Text data,
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}
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//
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// Service
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//
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service AssocService {
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/**
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* TAO Assoc Put operation.
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* Note that currently the argument visibility has no effect.
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*
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* @if update_count is true, then return the updated count for this assoc
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* @if update_count is false, then return 0
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* @return negative number if failure
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*/
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i64 taoAssocPut(
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/** name of table */
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1:Text tableName,
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/** type assoc */
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2:i64 assocType,
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/** id1 of assoc */
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3:i64 id1,
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/** id2 of assoc */
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4:i64 id2,
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/** id1Type of assoc */
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5:i64 id1Type,
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/** id2Type of assoc */
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6:i64 id2Type,
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/** timestamp of assoc */
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7:i64 timestamp,
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/** visibility */
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8:AssocVisibility visibility,
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/** whether to keep the count or not */
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9:bool update_count,
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/** version of the data blob */
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10:i64 dataVersion,
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/** serialized data of assoc */
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11:Text data,
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/** wormhole comment */
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12:Text wormhole_comment
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) throws (1:IOError io)
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/**
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* TAO Assoc Delete operation.
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*
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* @return the updated count for this assoc
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*/
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i64 taoAssocDelete(
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/** name of table */
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1:Text tableName,
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/** type assoc */
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2:i64 assocType,
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/** id1 of assoc */
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3:i64 id1,
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/** id2 of assoc */
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4:i64 id2,
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/** visibility flag for this delete */
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5:AssocVisibility visibility,
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/** whether to keep the count or not */
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6:bool update_count,
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/** wormhole comment */
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7:Text wormhole_comment
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) throws (1:IOError io)
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/**
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* TAO Assoc RangeGet operation.
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* Obtain assocs in bewteen start_time and end_time in reverse time order.
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* The range check is inclusive: start_time >= time && time >= end_time.
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* And yes, start_time >= end_time because this range scan is a backward
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* scan in time, starting with most recent time and scanning backwards
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* for the most recent n assocs.
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*/
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list<TaoAssocGetResult> taoAssocRangeGet(
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/** name of table */
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1:Text tableName,
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/** type of assoc */
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2:i64 assocType,
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/** id1 of assoc */
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3:i64 id1,
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/** maximum timestamp of assocs to retrieve */
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4:i64 start_time,
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/** minimum timestamp of assocs to retrieve */
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5:i64 end_time,
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/** number of assocs to skip from start */
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6:i64 offset,
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/** max number of assocs (columns) returned */
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7:i64 limit
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) throws (1:IOError io)
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/**
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* TAO Assoc Get operation.
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*/
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list<TaoAssocGetResult> taoAssocGet(
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/** name of table */
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1:Text tableName,
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/** type of assoc */
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2:i64 assocType,
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/** id1 of assoc */
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3:i64 id1,
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/** list of id2 need to be fetch */
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4:list<i64> id2s
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) throws (1:IOError io)
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/**
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* TAO Assoc Count Get operation.
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* Returns the number of assocs for given id1 and assoc type
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*/
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i64 taoAssocCount(
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/** name of table */
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1:Text tableName,
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/** type of assoc */
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2:i64 assocType,
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/** id1 of assoc */
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3:i64 id1,
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) throws (1:IOError io)
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}
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