Fix issue with query where any query with 'where' clause panicked (#36)

This PR fixes the nil pointer issue for queries containing
where clause. Also fixes some help messages to be at par with
other messages.

Also update the goreleaser config to ensure 'v' is added in published
release versions.

.goreleaser.yml

@@ -17,7 +17,7 @@ builds:
       - -trimpath
       - -tags=kqueue
     ldflags:
-      - -s -w -X main.Version={{ .Version }} -X main.Commit={{ .ShortCommit }}
+      - -s -w -X main.Version=v{{ .Version }} -X main.Commit={{ .ShortCommit }}
 
 archives:
   - format: tar.gz

cmd/query.go

@@ -46,7 +46,7 @@ var query = &cobra.Command{
 	Use:     "query [query] [flags]",
 	Example: "  pb query \"select * from frontend\" --from=10m --to=now",
 	Short:   "Run SQL query on a log stream",
-	Long:    "\nqRun SQL query on a log stream. Default output format is json. Use -i flag to open interactive table view.",
+	Long:    "\nRun SQL query on a log stream. Default output format is json. Use -i flag to open interactive table view.",
 	Args:    cobra.MaximumNArgs(1),
 	PreRunE: PreRunDefaultProfile,
 	RunE: func(command *cobra.Command, args []string) error {
@@ -72,15 +72,15 @@ var query = &cobra.Command{
 			start = defaultStart
 		}
 
-		end, _ := command.Flags().GetString(endFlag)
+		end, err := command.Flags().GetString(endFlag)
 		if err != nil {
 			return err
 		}
 		if end == "" {
 			end = defaultEnd
 		}
 
-		interactive, _ := command.Flags().GetBool(interactiveFlag)
+		interactive, err := command.Flags().GetBool(interactiveFlag)
 		if err != nil {
 			return err
 		}

cmd/role.go

@@ -62,8 +62,8 @@ func (user *RoleData) Render() string {
 }
 
 var AddRoleCmd = &cobra.Command{
-	Use:     "upsert role-name",
-	Example: "  pb role upsert ingestors",
+	Use:     "add role-name",
+	Example: "  pb role add ingestors",
 	Short:   "Add a new role",
 	Args:    cobra.ExactArgs(1),
 	RunE: func(cmd *cobra.Command, args []string) error {

cmd/tail.go

@@ -35,7 +35,7 @@ import (
 var TailCmd = &cobra.Command{
 	Use:     "tail stream-name",
 	Example: " pb tail backend_logs",
-	Short:   "tail a log stream",
+	Short:   "Stream live events from a log stream",
 	Args:    cobra.ExactArgs(1),
 	PreRunE: PreRunDefaultProfile,
 	RunE: func(cmd *cobra.Command, args []string) error {

pkg/model/query.go

@@ -25,7 +25,6 @@ import (
 	"os"
 	"pb/pkg/config"
 	"pb/pkg/iterator"
-	"regexp"
 	"strings"
 	"sync"
 	"time"
@@ -167,33 +166,31 @@ func createIteratorFromModel(m *QueryModel) *iterator.QueryIterator[QueryData, F
 	startTime = startTime.Truncate(time.Minute)
 	endTime = endTime.Truncate(time.Minute).Add(time.Minute)
 
-	regex := regexp.MustCompile(`^select\s+(?:\*|\w+(?:,\s*\w+)*)\s+from\s+(\w+)(?:\s+;)?$`)
-	matches := regex.FindStringSubmatch(m.query.Value())
-	if matches == nil {
-		return nil
+	table := streamNameFromQuery(m.query.Value())
+	if table != "" {
+		iter := iterator.NewQueryIterator(
+			startTime, endTime,
+			false,
+			func(t1, t2 time.Time) (QueryData, FetchResult) {
+				client := &http.Client{
+					Timeout: time.Second * 50,
+				}
+				return fetchData(client, &m.profile, m.query.Value(), t1.UTC().Format(time.RFC3339), t2.UTC().Format(time.RFC3339))
+			},
+			func(t1, t2 time.Time) bool {
+				client := &http.Client{
+					Timeout: time.Second * 50,
+				}
+				res, err := fetchData(client, &m.profile, "select count(*) as count from "+table, m.timeRange.StartValueUtc(), m.timeRange.EndValueUtc())
+				if err == fetchErr {
+					return false
+				}
+				count := res.Records[0]["count"].(float64)
+				return count > 0
+			})
+		return &iter
 	}
-	table := matches[1]
-	iter := iterator.NewQueryIterator(
-		startTime, endTime,
-		false,
-		func(t1, t2 time.Time) (QueryData, FetchResult) {
-			client := &http.Client{
-				Timeout: time.Second * 50,
-			}
-			return fetchData(client, &m.profile, m.query.Value(), t1.UTC().Format(time.RFC3339), t2.UTC().Format(time.RFC3339))
-		},
-		func(t1, t2 time.Time) bool {
-			client := &http.Client{
-				Timeout: time.Second * 50,
-			}
-			res, err := fetchData(client, &m.profile, "select count(*) as count from "+table, m.timeRange.StartValueUtc(), m.timeRange.EndValueUtc())
-			if err == fetchErr {
-				return false
-			}
-			count := res.Records[0]["count"].(float64)
-			return count > 0
-		})
-	return &iter
+	return nil
 }
 
 func NewQueryModel(profile config.Profile, queryStr string, startTime, endTime time.Time) QueryModel {
@@ -653,3 +650,15 @@ func countDigits(num int) int {
 	numDigits := int(math.Log10(math.Abs(float64(num)))) + 1
 	return numDigits
 }
+
+func streamNameFromQuery(query string) string {
+	stream := ""
+	tokens := strings.Split(query, " ")
+	for i, token := range tokens {
+		if token == "from" {
+			stream = tokens[i+1]
+			break
+		}
+	}
+	return stream
+}