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author | gary rong <garyrong0905@gmail.com> | 2018-06-11 21:11:48 +0800 |
---|---|---|
committer | Péter Szilágyi <peterke@gmail.com> | 2018-06-11 21:11:48 +0800 |
commit | f991995918899c48cc89c4d4ec4329bb4a7ce108 (patch) | |
tree | 4e02b6cc581540d4062fda71778fb6c80d0b1708 /ethdb | |
parent | aab7ab04b01acb0327786911e7434090c9afb722 (diff) | |
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ethdb: gracefullly handle quit channel (#16794)
* ethdb: gratefullly handle quit channel
* ethdb: minor polish
Diffstat (limited to 'ethdb')
-rw-r--r-- | ethdb/database.go | 74 |
1 files changed, 40 insertions, 34 deletions
diff --git a/ethdb/database.go b/ethdb/database.go index 86dd21076..f4a5ce2c8 100644 --- a/ethdb/database.go +++ b/ethdb/database.go @@ -141,6 +141,7 @@ func (db *LDBDatabase) Close() { if err := <-errc; err != nil { db.log.Error("Metrics collection failed", "err", err) } + db.quitChan = nil } err := db.db.Close() if err == nil { @@ -189,7 +190,7 @@ func (db *LDBDatabase) Meter(prefix string) { // 3 | 570 | 1113.18458 | 0.00000 | 0.00000 | 0.00000 // // This is how the write delay look like (currently): -// DelayN:5 Delay:406.604657ms +// DelayN:5 Delay:406.604657ms Paused: false // // This is how the iostats look like (currently): // Read(MB):3895.04860 Write(MB):3654.64712 @@ -210,13 +211,19 @@ func (db *LDBDatabase) meter(refresh time.Duration) { lastWritePaused time.Time ) + var ( + errc chan error + merr error + ) + // Iterate ad infinitum and collect the stats - for i := 1; ; i++ { + for i := 1; errc == nil && merr == nil; i++ { // Retrieve the database stats stats, err := db.db.GetProperty("leveldb.stats") if err != nil { db.log.Error("Failed to read database stats", "err", err) - return + merr = err + continue } // Find the compaction table, skip the header lines := strings.Split(stats, "\n") @@ -225,7 +232,8 @@ func (db *LDBDatabase) meter(refresh time.Duration) { } if len(lines) <= 3 { db.log.Error("Compaction table not found") - return + merr = errors.New("compaction table not found") + continue } lines = lines[3:] @@ -242,7 +250,8 @@ func (db *LDBDatabase) meter(refresh time.Duration) { value, err := strconv.ParseFloat(strings.TrimSpace(counter), 64) if err != nil { db.log.Error("Compaction entry parsing failed", "err", err) - return + merr = err + continue } compactions[i%2][idx] += value } @@ -262,7 +271,8 @@ func (db *LDBDatabase) meter(refresh time.Duration) { writedelay, err := db.db.GetProperty("leveldb.writedelay") if err != nil { db.log.Error("Failed to read database write delay statistic", "err", err) - return + merr = err + continue } var ( delayN int64 @@ -272,12 +282,14 @@ func (db *LDBDatabase) meter(refresh time.Duration) { ) if n, err := fmt.Sscanf(writedelay, "DelayN:%d Delay:%s Paused:%t", &delayN, &delayDuration, &paused); n != 3 || err != nil { db.log.Error("Write delay statistic not found") - return + merr = err + continue } duration, err = time.ParseDuration(delayDuration) if err != nil { db.log.Error("Failed to parse delay duration", "err", err) - return + merr = err + continue } if db.writeDelayNMeter != nil { db.writeDelayNMeter.Mark(delayN - delaystats[0]) @@ -317,53 +329,47 @@ func (db *LDBDatabase) meter(refresh time.Duration) { ioStats, err := db.db.GetProperty("leveldb.iostats") if err != nil { db.log.Error("Failed to read database iostats", "err", err) - return + merr = err + continue } + var nRead, nWrite float64 parts := strings.Split(ioStats, " ") if len(parts) < 2 { db.log.Error("Bad syntax of ioStats", "ioStats", ioStats) - return + merr = fmt.Errorf("bad syntax of ioStats %s", ioStats) + continue } - r := strings.Split(parts[0], ":") - if len(r) < 2 { + if n, err := fmt.Sscanf(parts[0], "Read(MB):%f", &nRead); n != 1 || err != nil { db.log.Error("Bad syntax of read entry", "entry", parts[0]) - return - } - read, err := strconv.ParseFloat(r[1], 64) - if err != nil { - db.log.Error("Read entry parsing failed", "err", err) - return + merr = err + continue } - w := strings.Split(parts[1], ":") - if len(w) < 2 { + if n, err := fmt.Sscanf(parts[1], "Write(MB):%f", &nWrite); n != 1 || err != nil { db.log.Error("Bad syntax of write entry", "entry", parts[1]) - return - } - write, err := strconv.ParseFloat(w[1], 64) - if err != nil { - db.log.Error("Write entry parsing failed", "err", err) - return + merr = err + continue } if db.diskReadMeter != nil { - db.diskReadMeter.Mark(int64((read - iostats[0]) * 1024 * 1024)) + db.diskReadMeter.Mark(int64((nRead - iostats[0]) * 1024 * 1024)) } if db.diskWriteMeter != nil { - db.diskWriteMeter.Mark(int64((write - iostats[1]) * 1024 * 1024)) + db.diskWriteMeter.Mark(int64((nWrite - iostats[1]) * 1024 * 1024)) } - iostats[0] = read - iostats[1] = write + iostats[0], iostats[1] = nRead, nWrite // Sleep a bit, then repeat the stats collection select { - case errc := <-db.quitChan: + case errc = <-db.quitChan: // Quit requesting, stop hammering the database - errc <- nil - return - case <-time.After(refresh): // Timeout, gather a new set of stats } } + + if errc == nil { + errc = <-db.quitChan + } + errc <- merr } func (db *LDBDatabase) NewBatch() Batch { |