Miscellaneous lint cleanup

cmd/influx/cli/cli.go

@@ -174,7 +174,7 @@ func (c *CommandLine) Run() error {
 		return fmt.Errorf("Failed to check token: %s", err.Error())
 	}
 	if token == "" {
-		fmt.Printf(noTokenMsg)
+		fmt.Print(noTokenMsg)
 	}
 	fmt.Printf("Connected to %s version %s\n", c.Client.Addr(), c.ServerVersion)
 
@@ -803,9 +803,7 @@ func (c *CommandLine) formatResults(result client.Result, separator string) []st
 			}
 		}
 
-		for _, column := range row.Columns {
-			columnNames = append(columnNames, column)
-		}
+		columnNames = append(columnNames, row.Columns...)
 
 		// Output a line separator if we have more than one set or results and format is column
 		if i > 0 && c.Format == "column" {

cmd/influx_inspect/report/report.go

@@ -77,11 +77,6 @@ func (cmd *Command) Run(args ...string) error {
 	measCardinalities := map[string]*hllpp.HLLPP{}
 	fieldCardinalities := map[string]*hllpp.HLLPP{}
 
-	ordering := make([]chan struct{}, 0, len(files))
-	for range files {
-		ordering = append(ordering, make(chan struct{}))
-	}
-
 	for _, f := range files {
 		file, err := os.OpenFile(f, os.O_RDONLY, 0600)
 		if err != nil {

cmd/influx_tsm/tracker.go

@@ -53,7 +53,7 @@ func (t *tracker) Run() error {
 				if err != nil {
 					log.Fatalf("Backup of database %v failed: %v\n", db, err)
 				}
-				log.Printf("Database %v backed up (%v)\n", db, time.Now().Sub(start))
+				log.Printf("Database %v backed up (%v)\n", db, time.Since(start))
 			})
 		}
 		t.wg.Wait()

cmd/influxd/main.go

@@ -94,13 +94,9 @@ func (m *Main) Run(args ...string) error {
 		m.Logger.Info("Listening for signals")
 
 		// Block until one of the signals above is received
-		select {
-		case <-signalCh:
-			m.Logger.Info("Signal received, initializing clean shutdown...")
-			go func() {
-				cmd.Close()
-			}()
-		}
+		<-signalCh
+		m.Logger.Info("Signal received, initializing clean shutdown...")
+		go cmd.Close()
 
 		// Block again until another signal is received, a shutdown timeout elapses,
 		// or the Command is gracefully closed

internal/meta_client.go

@@ -87,7 +87,7 @@ func (c *MetaClientMock) Databases() []meta.DatabaseInfo {
 }
 
 func (c *MetaClientMock) DeleteShardGroup(database string, policy string, id uint64) error {
-	return c.DeleteShardGroup(database, policy, id)
+	return c.DeleteShardGroupFn(database, policy, id)
 }
 
 func (c *MetaClientMock) DropContinuousQuery(database, name string) error {

models/points.go

@@ -235,7 +235,7 @@ func ParsePointsWithPrecision(buf []byte, defaultTime time.Time, precision strin
 
 		pt, err := parsePoint(block[start:], defaultTime, precision)
 		if err != nil {
-			failed = append(failed, fmt.Sprintf("unable to parse '%s': %v", string(block[start:len(block)]), err))
+			failed = append(failed, fmt.Sprintf("unable to parse '%s': %v", string(block[start:]), err))
 		} else {
 			points = append(points, pt)
 		}

services/continuous_querier/service.go

@@ -352,7 +352,7 @@ func (s *Service) ExecuteContinuousQuery(dbi *meta.DatabaseInfo, cqi *meta.Conti
 	}
 
 	if s.loggingEnabled {
-		s.Logger.Info(fmt.Sprintf("finished continuous query %s (%v to %v) in %s", cq.Info.Name, startTime, endTime, time.Now().Sub(start)))
+		s.Logger.Info(fmt.Sprintf("finished continuous query %s (%v to %v) in %s", cq.Info.Name, startTime, endTime, time.Since(start)))
 	}
 	return nil
 }

services/meta/data.go

@@ -903,10 +903,7 @@ func (s *RetentionPolicySpec) Matches(rpi *RetentionPolicyInfo) bool {
 	// Normalize with the retention policy info's duration instead of the spec
 	// since they should be the same and we're performing a comparison.
 	sgDuration := normalisedShardDuration(s.ShardGroupDuration, rpi.Duration)
-	if sgDuration != rpi.ShardGroupDuration {
-		return false
-	}
-	return true
+	return sgDuration == rpi.ShardGroupDuration
 }
 
 // marshal serializes to a protobuf representation.

services/meta/errors.go

@@ -48,8 +48,7 @@ var (
 
 	// ErrRetentionPolicyDurationTooLow is returned when updating a retention
 	// policy that has a duration lower than the allowed minimum.
-	ErrRetentionPolicyDurationTooLow = errors.New(fmt.Sprintf("retention policy duration must be at least %s",
-		MinRetentionPolicyDuration))
+	ErrRetentionPolicyDurationTooLow = fmt.Errorf("retention policy duration must be at least %s", MinRetentionPolicyDuration)
 
 	// ErrRetentionPolicyConflict is returned when creating a retention policy conflicts
 	// with an existing policy.

tsdb/engine/tsm1/cache.go

@@ -649,7 +649,7 @@ func (cl *CacheLoader) WithLogger(log zap.Logger) {
 func (c *Cache) UpdateAge() {
 	c.mu.RLock()
 	defer c.mu.RUnlock()
-	ageStat := int64(time.Now().Sub(c.lastSnapshot) / time.Millisecond)
+	ageStat := int64(time.Since(c.lastSnapshot) / time.Millisecond)
 	atomic.StoreInt64(&c.stats.CacheAgeMs, ageStat)
 }
 

tsdb/engine/tsm1/compact.go

@@ -288,7 +288,7 @@ func (c *DefaultPlanner) Plan(lastWrite time.Time) []CompactionGroup {
 	generations := c.findGenerations()
 
 	// first check if we should be doing a full compaction because nothing has been written in a long time
-	if c.CompactFullWriteColdDuration > 0 && time.Now().Sub(lastWrite) > c.CompactFullWriteColdDuration && len(generations) > 1 {
+	if c.CompactFullWriteColdDuration > 0 && time.Since(lastWrite) > c.CompactFullWriteColdDuration && len(generations) > 1 {
 		var tsmFiles []string
 		var genCount int
 		for i, group := range generations {
@@ -1208,7 +1208,7 @@ func (k *tsmKeyIterator) combine(dedup bool) blocks {
 }
 
 func (k *tsmKeyIterator) chunk(dst blocks) blocks {
-	for len(k.mergedValues) > k.size {
+	if len(k.mergedValues) > k.size {
 		values := k.mergedValues[:k.size]
 		cb, err := Values(values).Encode(nil)
 		if err != nil {

tsdb/engine/tsm1/engine.go

@@ -842,7 +842,7 @@ func (e *Engine) WriteSnapshot() error {
 
 	defer func() {
 		if started != nil {
-			e.Cache.UpdateCompactTime(time.Now().Sub(*started))
+			e.Cache.UpdateCompactTime(time.Since(*started))
 			e.logger.Info(fmt.Sprintf("Snapshot for path %s written in %v", e.path, time.Since(*started)))
 		}
 	}()
@@ -970,7 +970,7 @@ func (e *Engine) ShouldCompactCache(lastWriteTime time.Time) bool {
 	}
 
 	return sz > e.CacheFlushMemorySizeThreshold ||
-		time.Now().Sub(lastWriteTime) > e.CacheFlushWriteColdDuration
+		time.Since(lastWriteTime) > e.CacheFlushWriteColdDuration
 }
 
 func (e *Engine) compactTSMLevel(fast bool, level int, quit <-chan struct{}) {

tsdb/engine/tsm1/file_store.go

@@ -415,7 +415,7 @@ func (f *FileStore) Open() error {
 		go func(idx int, file *os.File) {
 			start := time.Now()
 			df, err := NewTSMReader(file)
-			f.logger.Info(fmt.Sprintf("%s (#%d) opened in %v", file.Name(), idx, time.Now().Sub(start)))
+			f.logger.Info(fmt.Sprintf("%s (#%d) opened in %v", file.Name(), idx, time.Since(start)))
 
 			if err != nil {
 				readerC <- &res{r: df, err: fmt.Errorf("error opening memory map for file %s: %v", file.Name(), err)}
@@ -525,10 +525,8 @@ func (f *FileStore) Replace(oldFiles, newFiles []string) error {
 	// and load the new files.  We copy the pointers here to minimize
 	// the time that locks are held as well as to ensure that the replacement
 	// is atomic.©
-	var updated []TSMFile
-	for _, t := range f.files {
-		updated = append(updated, t)
-	}
+	updated := make([]TSMFile, len(f.files))
+	copy(updated, f.files)
 
 	// Rename all the new files to make them live on restart
 	for _, file := range newFiles {

tsdb/engine/tsm1/iterator.gen.go

@@ -271,24 +271,22 @@ func (itr *floatLimitIterator) Stats() influxql.IteratorStats { return itr.input
 func (itr *floatLimitIterator) Close() error                  { return itr.input.Close() }
 
 func (itr *floatLimitIterator) Next() (*influxql.FloatPoint, error) {
-	for {
-		// Check if we are beyond the limit.
-		if (itr.n - itr.opt.Offset) > itr.opt.Limit {
-			return nil, nil
-		}
-
-		// Read the next point.
-		p, err := itr.input.Next()
-		if p == nil || err != nil {
-			return nil, err
-		}
-
-		// Increment counter.
-		itr.n++
-
-		// Offsets are handled by a higher level iterator so return all points.
-		return p, nil
+	// Check if we are beyond the limit.
+	if (itr.n - itr.opt.Offset) > itr.opt.Limit {
+		return nil, nil
 	}
+
+	// Read the next point.
+	p, err := itr.input.Next()
+	if p == nil || err != nil {
+		return nil, err
+	}
+
+	// Increment counter.
+	itr.n++
+
+	// Offsets are handled by a higher level iterator so return all points.
+	return p, nil
 }
 
 // floatCursor represents an object for iterating over a single float field.
@@ -714,24 +712,22 @@ func (itr *integerLimitIterator) Stats() influxql.IteratorStats { return itr.inp
 func (itr *integerLimitIterator) Close() error                  { return itr.input.Close() }
 
 func (itr *integerLimitIterator) Next() (*influxql.IntegerPoint, error) {
-	for {
-		// Check if we are beyond the limit.
-		if (itr.n - itr.opt.Offset) > itr.opt.Limit {
-			return nil, nil
-		}
-
-		// Read the next point.
-		p, err := itr.input.Next()
-		if p == nil || err != nil {
-			return nil, err
-		}
-
-		// Increment counter.
-		itr.n++
-
-		// Offsets are handled by a higher level iterator so return all points.
-		return p, nil
+	// Check if we are beyond the limit.
+	if (itr.n - itr.opt.Offset) > itr.opt.Limit {
+		return nil, nil
 	}
+
+	// Read the next point.
+	p, err := itr.input.Next()
+	if p == nil || err != nil {
+		return nil, err
+	}
+
+	// Increment counter.
+	itr.n++
+
+	// Offsets are handled by a higher level iterator so return all points.
+	return p, nil
 }
 
 // integerCursor represents an object for iterating over a single integer field.
@@ -1157,24 +1153,22 @@ func (itr *stringLimitIterator) Stats() influxql.IteratorStats { return itr.inpu
 func (itr *stringLimitIterator) Close() error                  { return itr.input.Close() }
 
 func (itr *stringLimitIterator) Next() (*influxql.StringPoint, error) {
-	for {
-		// Check if we are beyond the limit.
-		if (itr.n - itr.opt.Offset) > itr.opt.Limit {
-			return nil, nil
-		}
-
-		// Read the next point.
-		p, err := itr.input.Next()
-		if p == nil || err != nil {
-			return nil, err
-		}
-
-		// Increment counter.
-		itr.n++
-
-		// Offsets are handled by a higher level iterator so return all points.
-		return p, nil
+	// Check if we are beyond the limit.
+	if (itr.n - itr.opt.Offset) > itr.opt.Limit {
+		return nil, nil
 	}
+
+	// Read the next point.
+	p, err := itr.input.Next()
+	if p == nil || err != nil {
+		return nil, err
+	}
+
+	// Increment counter.
+	itr.n++
+
+	// Offsets are handled by a higher level iterator so return all points.
+	return p, nil
 }
 
 // stringCursor represents an object for iterating over a single string field.
@@ -1600,24 +1594,22 @@ func (itr *booleanLimitIterator) Stats() influxql.IteratorStats { return itr.inp
 func (itr *booleanLimitIterator) Close() error                  { return itr.input.Close() }
 
 func (itr *booleanLimitIterator) Next() (*influxql.BooleanPoint, error) {
-	for {
-		// Check if we are beyond the limit.
-		if (itr.n - itr.opt.Offset) > itr.opt.Limit {
-			return nil, nil
-		}
-
-		// Read the next point.
-		p, err := itr.input.Next()
-		if p == nil || err != nil {
-			return nil, err
-		}
-
-		// Increment counter.
-		itr.n++
-
-		// Offsets are handled by a higher level iterator so return all points.
-		return p, nil
+	// Check if we are beyond the limit.
+	if (itr.n - itr.opt.Offset) > itr.opt.Limit {
+		return nil, nil
 	}
+
+	// Read the next point.
+	p, err := itr.input.Next()
+	if p == nil || err != nil {
+		return nil, err
+	}
+
+	// Increment counter.
+	itr.n++
+
+	// Offsets are handled by a higher level iterator so return all points.
+	return p, nil
 }
 
 // booleanCursor represents an object for iterating over a single boolean field.

tsdb/engine/tsm1/iterator.gen.go.tmpl

@@ -267,24 +267,22 @@ func (itr *{{.name}}LimitIterator) Stats() influxql.IteratorStats { return itr.i
 func (itr *{{.name}}LimitIterator) Close() error                  { return itr.input.Close() }
 
 func (itr *{{.name}}LimitIterator) Next() (*influxql.{{.Name}}Point, error) {
-	for {
-		// Check if we are beyond the limit.
-		if (itr.n-itr.opt.Offset) > itr.opt.Limit {
-			return nil, nil
-		}
-
-		// Read the next point.
-		p, err := itr.input.Next()
-		if p == nil || err != nil {
-			return nil, err
-		}
-
-		// Increment counter.
-		itr.n++
-
-		// Offsets are handled by a higher level iterator so return all points.
-		return p, nil
+	// Check if we are beyond the limit.
+	if (itr.n-itr.opt.Offset) > itr.opt.Limit {
+		return nil, nil
 	}
+
+	// Read the next point.
+	p, err := itr.input.Next()
+	if p == nil || err != nil {
+		return nil, err
+	}
+
+	// Increment counter.
+	itr.n++
+
+	// Offsets are handled by a higher level iterator so return all points.
+	return p, nil
 }
 
 // {{.name}}Cursor represents an object for iterating over a single {{.name}} field.

tsdb/engine/tsm1/timestamp.go

@@ -142,7 +142,9 @@ func (e *encoder) Bytes() ([]byte, error) {
 
 func (e *encoder) encodePacked(div uint64, dts []uint64) ([]byte, error) {
 	for _, v := range dts[1:] {
-		e.enc.Write(uint64(v) / div)
+		if err := e.enc.Write(uint64(v) / div); err != nil {
+			return nil, err
+		}
 	}
 
 	// The compressed deltas

tsdb/meta.go

@@ -1143,7 +1143,7 @@ type FilterExprs map[uint64]influxql.Expr
 // DeleteBoolLiteralTrues deletes all elements whose filter expression is a boolean literal true.
 func (fe FilterExprs) DeleteBoolLiteralTrues() {
 	for id, expr := range fe {
-		if e, ok := expr.(*influxql.BooleanLiteral); ok && e.Val == true {
+		if e, ok := expr.(*influxql.BooleanLiteral); ok && e.Val {
 			delete(fe, id)
 		}
 	}
@@ -1262,7 +1262,7 @@ func expandExprWithValues(expr influxql.Expr, keys []string, tagExprs []tagExpr,
 		// Reduce using the current tag key/value set.
 		// Ignore it if reduces down to "false".
 		e := influxql.Reduce(expr, &tagValuer{tags: m})
-		if e, ok := e.(*influxql.BooleanLiteral); ok && e.Val == false {
+		if e, ok := e.(*influxql.BooleanLiteral); ok && !e.Val {
 			return nil
 		}
 

tsdb/shard.go

@@ -262,7 +262,7 @@ func (s *Shard) Open() error {
 
 		s.engine = e
 
-		s.logger.Info(fmt.Sprintf("%s database index loaded in %s", s.path, time.Now().Sub(start)))
+		s.logger.Info(fmt.Sprintf("%s database index loaded in %s", s.path, time.Since(start)))
 
 		go s.monitor()
 
@@ -1169,30 +1169,28 @@ func (itr *seriesIterator) Close() error { return nil }
 
 // Next emits the next point in the iterator.
 func (itr *seriesIterator) Next() (*influxql.FloatPoint, error) {
-	for {
-		// Load next measurement's keys if there are no more remaining.
-		if itr.keys.i >= len(itr.keys.buf) {
-			if err := itr.nextKeys(); err != nil {
-				return nil, err
-			}
-			if len(itr.keys.buf) == 0 {
-				return nil, nil
-			}
+	// Load next measurement's keys if there are no more remaining.
+	if itr.keys.i >= len(itr.keys.buf) {
+		if err := itr.nextKeys(); err != nil {
+			return nil, err
 		}
-
-		// Read the next key.
-		key := itr.keys.buf[itr.keys.i]
-		itr.keys.i++
-
-		// Write auxiliary fields.
-		for i, f := range itr.opt.Aux {
-			switch f.Val {
-			case "key":
-				itr.point.Aux[i] = key
-			}
+		if len(itr.keys.buf) == 0 {
+			return nil, nil
 		}
-		return &itr.point, nil
 	}
+
+	// Read the next key.
+	key := itr.keys.buf[itr.keys.i]
+	itr.keys.i++
+
+	// Write auxiliary fields.
+	for i, f := range itr.opt.Aux {
+		switch f.Val {
+		case "key":
+			itr.point.Aux[i] = key
+		}
+	}
+	return &itr.point, nil
 }
 
 // nextKeys reads all keys for the next measurement.

tsdb/store.go

@@ -194,7 +194,7 @@ func (s *Store) loadShards() error {
 					}
 
 					resC <- &res{s: shard}
-					s.Logger.Info(fmt.Sprintf("%s opened in %s", path, time.Now().Sub(start)))
+					s.Logger.Info(fmt.Sprintf("%s opened in %s", path, time.Since(start)))
 				}(s.databaseIndexes[db], db, rp.Name(), sh.Name())
 			}
 		}