Hyperledger Fabric After peer launch of the source code parsing three

As we all know, the database used by Hyperledger is ROCKSDB, and if you do not modify it, the data will be stored in the/var/hyperledger/production/db directory.

Now let's analyze the relevant code in the gray section of the diagram.

The code structure diagram is as follows

Start the database, initialize the OPENCHAINDB instance, and open the database. Note that this method does not guarantee the correct behavior of concurrent calls

Func Start () {

Openchaindb.open ()

}

Open opens a database that already exists in Hyperledger

Func (openchaindb *openchaindb) open () {

DbPath: = Getdbpath ()

Missing, err: = Dirmissingorempty (DbPath)

If err! = Nil {

Panic (FMT. Sprintf ("Error while trying to open DB:%s", err))

}

DBLOGGER.DEBUGF ("is DB path [%s] empty [%t]", DbPath, missing)

If missing {

Err = OS. Mkdirall (path. Dir (DbPath), 0755)

If err! = Nil {

Panic (FMT. Sprintf ("Error making directory path [%s]:%s", DbPath, Err))

}

}

OPTs: = Gorocksdb. Newdefaultoptions ()

Defer opts. Destroy ()

Maxlogfilesize: = Viper. GetInt ("Peer.db.maxLogFileSize")

If maxlogfilesize > 0 {

Dblogger.infof ("Setting rocksdb maxlogfilesize to%d", maxlogfilesize)

OPTs. Setmaxlogfilesize (Maxlogfilesize)

}

Keeplogfilenum: = Viper. GetInt ("Peer.db.keepLogFileNum")

If Keeplogfilenum > 0 {

Dblogger.infof ("Setting rocksdb Keeplogfilenum to%d", keeplogfilenum)

OPTs. Setkeeplogfilenum (Keeplogfilenum)

}

Loglevelstr: = Viper. GetString ("Peer.db.loglevel")

LogLevel, OK: = Rocksdbloglevelmap[loglevelstr]

If OK {

Dblogger.infof ("Setting Rocks db Infologlevel to%d", logLevel)

OPTs. Setinfologlevel (LogLevel)

}

OPTs. Setcreateifmissing (missing)

OPTs. Setcreateifmissingcolumnfamilies (True)

Cfnames: = []string{"Default"}

Cfnames = Append (Cfnames, columnfamilies ...)

var cfopts []*gorocksdb. Options

For range Cfnames {

cfopts = Append (cfopts, opts)

}

DB, Cfhandlers, err: = Gorocksdb. Opendbcolumnfamilies (opts, DbPath, Cfnames, cfopts)

If err! = Nil {

Panic (FMT. Sprintf ("Error opening DB:%s", err))

}

Openchaindb.db = DB

OPENCHAINDB.BLOCKCHAINCF = cfhandlers[1]

OPENCHAINDB.STATECF = cfhandlers[2]

OPENCHAINDB.STATEDELTACF = cfhandlers[3]

OPENCHAINDB.INDEXESCF = Cfhandlers[4]

OPENCHAINDB.PERSISTCF = cfhandlers[5]

}

Newdefaultoptions Create a default options.

Func newdefaultoptions () *options {

Return Newnativeoptions (C.rocksdb_options_create ())

}
//options means that all optional options are available when opening a database in open form

Type Options struct {

C *c.rocksdb_options_t

Keep the reference GC.

Env  *env

bbto *blockbasedtableoptions

In destroy, we have to make sure we can release their memory.

CCMP *c.rocksdb_comparator_t

CMO  *c.rocksdb_mergeoperator_t

CST  *c.rocksdb_slicetransform_t

CCF  *c.rocksdb_compactionfilter_t

}

Newdefaultoptions Create a default options.

Func newdefaultoptions () *options {

Return Newnativeoptions (C.rocksdb_options_create ())

}

Newnativeoptions create an Options object.

Func newnativeoptions (c *c.rocksdb_options_t) *options {

Return &OPTIONS{C:C}

}

Newnativeoptions create an Options object.

Func newnativeoptions (c *c.rocksdb_options_t) *options {

Return &OPTIONS{C:C}

}

Options means that when opening a database in open, all optional options

Type Options struct {

C *c.rocksdb_options_t

Keep the reference GC.

Env  *env

bbto *blockbasedtableoptions

In destroy, we have to make sure we can release their memory.

CCMP *c.rocksdb_comparator_t

CMO  *c.rocksdb_mergeoperator_t

CST  *c.rocksdb_slicetransform_t

CCF  *c.rocksdb_compactionfilter_t

}

Setmaxlogfilesize setting the maximum size of the Infolog file

If the log file is larger than the Max_log_file_size constant, the new log will be created

If Max_log_file_size equals 0, all logs are written to a log

Default Size: 0

Func (OPTs *options) setmaxlogfilesize (value int) {

C.rocksdb_options_set_max_log_file_size (OPTS.C, c.size_t (value))

}

Setkeeplogfilenum setting the maximum saved log information file

Default size: 1000

Func (OPTs *options) setkeeplogfilenum (value int) {

C.rocksdb_options_set_keep_log_file_num (OPTS.C, c.size_t (value))