Make sure ooniprobe show <id> is WAI (#61)

1. the description of the command and the helper function are
clear hints that the command is intended to show a single JSON
measurement at a time (also the use case seems clear) [*]

2. the function used to read lines was failing for all my
measurements that take input. Since that was not the optimal
pattern anyway, use a better pattern to fix it.

3. some changes are automatically applied by my editor (VSCode
with the Go plugin) and I am fine with them.

4. while reading code, I also applied my preferred pattern
wrt whitespaces, i.e.: no whitespace inside functions, if a
function feels too long in this way, just break it.

Closes #57

[*] Even if we want to show many measurements at a time, which
does not seem needed, given the UI patterns, this functionality
won't be P0. What is P0 is to bless a new beta and give to
@sarathms binaries for all archs that support a basic `show`.

internal/cli/list/list.go

@@ -10,9 +10,7 @@ import (
 
 func init() {
 	cmd := root.Command("list", "List results")
-
 	resultID := cmd.Arg("id", "the id of the result to list measurements for").Int64()
-
 	cmd.Action(func(_ *kingpin.ParseContext) error {
 		ctx, err := root.Init()
 		if err != nil {
@@ -25,7 +23,6 @@ func init() {
 				log.WithError(err).Error("failed to list measurements")
 				return err
 			}
-
 			msmtSummary := output.MeasurementSummaryData{
 				TotalCount:         0,
 				AnomalyCount:       0,
@@ -45,7 +42,6 @@ func init() {
 				if idx == len(measurements)-1 {
 					isLast = true
 				}
-
 				// We assume that since these are summary level information the first
 				// item will contain the information necessary.
 				if isFirst {
@@ -70,7 +66,6 @@ func init() {
 				log.WithError(err).Error("failed to list results")
 				return err
 			}
-
 			if len(incompleteResults) > 0 {
 				output.SectionTitle("Incomplete results")
 			}
@@ -92,7 +87,6 @@ func init() {
 					DataUsageDown:           result.DataUsageDown,
 				})
 			}
-
 			resultSummary := output.ResultSummaryData{}
 			netCount := make(map[uint]int)
 			output.SectionTitle("Results")
@@ -127,10 +121,8 @@ func init() {
 				resultSummary.TotalDataUsageDown += result.DataUsageDown
 			}
 			resultSummary.TotalNetworks = int64(len(netCount))
-
 			output.ResultSummary(resultSummary)
 		}
-
 		return nil
 	})
 }

internal/cli/show/show.go

@@ -10,9 +10,7 @@ import (
 
 func init() {
 	cmd := root.Command("show", "Show a specific measurement")
-
+	msmtID := cmd.Arg("id", "the id of the measurement to show").Required().Int64()
-	msmtID := cmd.Arg("id", "the id of the measurement to show").Int64()
-
 	cmd.Action(func(_ *kingpin.ParseContext) error {
 		ctx, err := root.Init()
 		if err != nil {

internal/database/actions.go

@@ -1,9 +1,9 @@
 package database
 
 import (
+	"bufio"
 	"database/sql"
 	"encoding/json"
-	"bufio"
 	"io"
 	"io/ioutil"
 	"os"
@@ -11,9 +11,8 @@ import (
 	"time"
 
 	"github.com/apex/log"
-	"github.com/ooni/probe-cli/utils"
 	"github.com/ooni/probe-cli/internal/enginex"
-	"github.com/ooni/probe-cli/internal/util"
+	"github.com/ooni/probe-cli/utils"
 	"github.com/pkg/errors"
 	db "upper.io/db.v3"
 	"upper.io/db.v3/lib/sqlbuilder"
@@ -22,7 +21,6 @@ import (
 // ListMeasurements given a result ID
 func ListMeasurements(sess sqlbuilder.Database, resultID int64) ([]MeasurementURLNetwork, error) {
 	measurements := []MeasurementURLNetwork{}
-
 	req := sess.Select(
 		db.Raw("networks.*"),
 		db.Raw("urls.*"),
@@ -34,7 +32,6 @@ func ListMeasurements(sess sqlbuilder.Database, resultID int64) ([]MeasurementUR
 		LeftJoin("urls").On("urls.url_id = measurements.url_id").
 		OrderBy("measurements.measurement_start_time").
 		Where("results.result_id = ?", resultID)
-
 	if err := req.All(&measurements); err != nil {
 		log.Errorf("failed to run query %s: %v", req.String(), err)
 		return measurements, err
@@ -42,20 +39,18 @@ func ListMeasurements(sess sqlbuilder.Database, resultID int64) ([]MeasurementUR
 	return measurements, nil
 }
 
-// GetMeasurementJSON will a map[string]interface{} given a database and a measurementID
+// GetMeasurementJSON returns a map[string]interface{} given a database and a measurementID
 func GetMeasurementJSON(sess sqlbuilder.Database, measurementID int64) (map[string]interface{}, error) {
 	var (
 		measurement MeasurementURLNetwork
 		msmtJSON    map[string]interface{}
 	)
-
 	req := sess.Select(
 		db.Raw("urls.*"),
 		db.Raw("measurements.*"),
 	).From("measurements").
 		LeftJoin("urls").On("urls.url_id = measurements.url_id").
 		Where("measurements.measurement_id= ?", measurementID)
-
 	if err := req.One(&measurement); err != nil {
 		log.Errorf("failed to run query %s: %v", req.String(), err)
 		return nil, err
@@ -63,7 +58,7 @@ func GetMeasurementJSON(sess sqlbuilder.Database, measurementID int64) (map[stri
 	reportFilePath := measurement.Measurement.ReportFilePath
 	// If the url->url is NULL then we are dealing with a single entry
 	// measurement and all we have to do is read the file and return it.
-	if (measurement.URL.URL.Valid == false) {
+	if measurement.URL.URL.Valid == false {
 		b, err := ioutil.ReadFile(reportFilePath)
 		if err != nil {
 			return nil, err
@@ -73,7 +68,6 @@ func GetMeasurementJSON(sess sqlbuilder.Database, measurementID int64) (map[stri
 		}
 		return msmtJSON, nil
 	}
-
 	// When the URL is a string then we need to seek until we reach the
 	// measurement line in the file that matches the target input
 	url := measurement.URL.URL.String
@@ -82,20 +76,19 @@ func GetMeasurementJSON(sess sqlbuilder.Database, measurementID int64) (map[stri
 		return nil, err
 	}
 	defer file.Close()
-
 	reader := bufio.NewReader(file)
-
 	for {
-		line, err := util.ReadLine(reader)
+		line, err := reader.ReadString('\n')
-		if (err == io.EOF) {
+		if err == io.EOF {
 			break
-		} else if err != nil {
+		}
+		if err != nil {
 			return nil, err
 		}
 		if err := json.Unmarshal([]byte(line), &msmtJSON); err != nil {
 			return nil, err
 		}
-		if (msmtJSON["input"].(string) == url) {
+		if msmtJSON["input"].(string) == url {
 			return msmtJSON, nil
 		}
 	}
@@ -166,21 +159,18 @@ func GetMeasurementCounts(sess sqlbuilder.Database, resultID int64) (uint64, uin
 func ListResults(sess sqlbuilder.Database) ([]ResultNetwork, []ResultNetwork, error) {
 	doneResults := []ResultNetwork{}
 	incompleteResults := []ResultNetwork{}
-
 	req := sess.Select(
 		db.Raw("networks.*"),
 		db.Raw("results.*"),
 	).From("results").
 		Join("networks").On("results.network_id = networks.network_id").
 		OrderBy("results.result_start_time")
-
 	if err := req.Where("result_is_done = true").All(&doneResults); err != nil {
 		return doneResults, incompleteResults, errors.Wrap(err, "failed to get result done list")
 	}
 	if err := req.Where("result_is_done = false").All(&incompleteResults); err != nil {
 		return doneResults, incompleteResults, errors.Wrap(err, "failed to get result done list")
 	}
-
 	return doneResults, incompleteResults, nil
 }
 

internal/util/util.go

@@ -1,7 +1,6 @@
 package util
 
 import (
-	"bufio"
 	"bytes"
 	"fmt"
 	"os"
@@ -30,6 +29,8 @@ var ansiEscapes = regexp.MustCompile(`[\x1B\x9B][[\]()#;?]*` +
 	`(?:(?:(?:[a-zA-Z\d]*(?:;[a-zA-Z\\d]*)*)?\x07)` +
 	`|(?:(?:\d{1,4}(?:;\d{0,4})*)?[\dA-PRZcf-ntqry=><~]))`)
 
+// EscapeAwareRuneCountInString counts the number of runes in a
+// string taking into account escape sequences.
 func EscapeAwareRuneCountInString(s string) int {
 	n := utf8.RuneCountInString(s)
 	for _, sm := range ansiEscapes.FindAllString(s, -1) {
@@ -38,6 +39,7 @@ func EscapeAwareRuneCountInString(s string) int {
 	return n
 }
 
+// RightPadd adds right padding in from of a string
 func RightPad(str string, length int) string {
 	c := length - EscapeAwareRuneCountInString(str)
 	if c < 0 {
@@ -113,17 +115,3 @@ func WrapString(s string, lim uint) string {
 
 	return buf.String()
 }
-
-// ReadLine will read a single line from a bufio.Reader
-func ReadLine(r *bufio.Reader) (string, error) {
-	var (
-		isPrefix bool
-		err      error
-		line, ln []byte
-	)
-	for isPrefix && err == nil {
-		line, isPrefix, err = r.ReadLine()
-		ln = append(ln, line...)
-	}
-	return string(ln), err
-}