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cli.go
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cli.go
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package cli // import "github.com/influxdata/influxdb/cmd/influx/cli"
import (
"bytes"
"encoding/csv"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"net/url"
"os"
"os/signal"
"path/filepath"
"sort"
"strconv"
"strings"
"syscall"
"text/tabwriter"
"golang.org/x/crypto/ssh/terminal"
"github.com/influxdata/influxdb/client"
"github.com/influxdata/influxdb/importer/v8"
"github.com/influxdata/influxdb/models"
"github.com/peterh/liner"
)
const (
noTokenMsg = "Visit https://enterprise.influxdata.com to register for updates, InfluxDB server management, and monitoring.\n"
)
// ErrBlankCommand is returned when a parsed command is empty.
var ErrBlankCommand = errors.New("empty input")
// CommandLine holds CLI configuration and state
type CommandLine struct {
Client *client.Client
Line *liner.State
Host string
Port int
Username string
Password string
Database string
Ssl bool
UnsafeSsl bool
RetentionPolicy string
ClientVersion string
ServerVersion string
Pretty bool // controls pretty print for json
Format string // controls the output format. Valid values are json, csv, or column
Precision string
WriteConsistency string
Execute string
ShowVersion bool
Import bool
PPS int // Controls how many points per second the import will allow via throttling
Path string
Compressed bool
Chunked bool
Quit chan struct{}
IgnoreSignals bool // Ignore signals normally caught by this process (used primarily for testing)
ForceTTY bool // Force the CLI to act as if it were connected to a TTY
osSignals chan os.Signal
historyFilePath string
}
// New returns an instance of CommandLine
func New(version string) *CommandLine {
return &CommandLine{
ClientVersion: version,
Quit: make(chan struct{}, 1),
osSignals: make(chan os.Signal, 1),
}
}
// Run executes the CLI
func (c *CommandLine) Run() error {
hasTTY := c.ForceTTY || terminal.IsTerminal(int(os.Stdin.Fd()))
var promptForPassword bool
// determine if they set the password flag but provided no value
for _, v := range os.Args {
v = strings.ToLower(v)
if (strings.HasPrefix(v, "-password") || strings.HasPrefix(v, "--password")) && c.Password == "" {
promptForPassword = true
break
}
}
// Check if we will be able to prompt for the password later.
if promptForPassword && !hasTTY {
return errors.New("Unable to prompt for a password with no TTY.")
}
// Read environment variables for username/password.
if c.Username == "" {
c.Username = os.Getenv("INFLUX_USERNAME")
}
// If we are going to be prompted for a password, always use the entered password.
if promptForPassword {
// Open the liner (temporarily) and prompt for the password.
p, e := func() (string, error) {
l := liner.NewLiner()
defer l.Close()
return l.PasswordPrompt("password: ")
}()
if e != nil {
return errors.New("Unable to parse password")
}
c.Password = p
} else if c.Password == "" {
c.Password = os.Getenv("INFLUX_PASSWORD")
}
if err := c.Connect(""); err != nil {
return fmt.Errorf(
"Failed to connect to %s\nPlease check your connection settings and ensure 'influxd' is running.",
c.Client.Addr())
}
// Modify precision.
c.SetPrecision(c.Precision)
if c.Execute != "" {
// Make the non-interactive mode send everything through the CLI's parser
// the same way the interactive mode works
lines := strings.Split(c.Execute, "\n")
for _, line := range lines {
if err := c.ParseCommand(line); err != nil {
return err
}
}
return nil
}
if c.Import {
path := net.JoinHostPort(c.Host, strconv.Itoa(c.Port))
u, e := client.ParseConnectionString(path, c.Ssl)
if e != nil {
return e
}
config := v8.NewConfig()
config.Username = c.Username
config.Password = c.Password
config.Precision = "ns"
config.WriteConsistency = "any"
config.Path = c.Path
config.Version = c.ClientVersion
config.URL = u
config.Compressed = c.Compressed
config.PPS = c.PPS
config.Precision = c.Precision
i := v8.NewImporter(config)
if err := i.Import(); err != nil {
err = fmt.Errorf("ERROR: %s\n", err)
return err
}
return nil
}
if !hasTTY {
cmd, err := ioutil.ReadAll(os.Stdin)
if err != nil {
return err
}
return c.ExecuteQuery(string(cmd))
}
if !c.IgnoreSignals {
// register OS signals for graceful termination
signal.Notify(c.osSignals, syscall.SIGINT, syscall.SIGTERM)
}
c.Line = liner.NewLiner()
defer c.Line.Close()
c.Line.SetMultiLineMode(true)
token, err := c.DatabaseToken()
if err != nil {
return fmt.Errorf("Failed to check token: %s", err.Error())
}
if token == "" {
fmt.Printf(noTokenMsg)
}
fmt.Printf("Connected to %s version %s\n", c.Client.Addr(), c.ServerVersion)
c.Version()
// Only load/write history if HOME environment variable is set.
if homeDir := os.Getenv("HOME"); homeDir != "" {
// Attempt to load the history file.
c.historyFilePath = filepath.Join(homeDir, ".influx_history")
if historyFile, err := os.Open(c.historyFilePath); err == nil {
c.Line.ReadHistory(historyFile)
historyFile.Close()
}
}
// read from prompt until exit is run
return c.mainLoop()
}
// mainLoop runs the main prompt loop for the CLI.
func (c *CommandLine) mainLoop() error {
for {
select {
case <-c.osSignals:
c.exit()
return nil
case <-c.Quit:
c.exit()
return nil
default:
l, e := c.Line.Prompt("> ")
if e == io.EOF {
// Instead of die, register that someone exited the program gracefully
l = "exit"
} else if e != nil {
c.exit()
return e
}
if err := c.ParseCommand(l); err != ErrBlankCommand && !strings.HasPrefix(strings.TrimSpace(l), "auth") {
c.Line.AppendHistory(l)
c.saveHistory()
}
}
}
}
// ParseCommand parses an instruction and calls related method, if any
func (c *CommandLine) ParseCommand(cmd string) error {
lcmd := strings.TrimSpace(strings.ToLower(cmd))
tokens := strings.Fields(lcmd)
if len(tokens) > 0 {
switch tokens[0] {
case "exit", "quit":
close(c.Quit)
case "gopher":
c.gopher()
case "connect":
return c.Connect(cmd)
case "auth":
c.SetAuth(cmd)
case "help":
c.help()
case "history":
c.history()
case "format":
c.SetFormat(cmd)
case "precision":
c.SetPrecision(cmd)
case "consistency":
c.SetWriteConsistency(cmd)
case "settings":
c.Settings()
case "pretty":
c.Pretty = !c.Pretty
if c.Pretty {
fmt.Println("Pretty print enabled")
} else {
fmt.Println("Pretty print disabled")
}
case "use":
c.use(cmd)
case "insert":
return c.Insert(cmd)
default:
return c.ExecuteQuery(cmd)
}
return nil
}
return ErrBlankCommand
}
// Connect connects client to a server
func (c *CommandLine) Connect(cmd string) error {
var cl *client.Client
var u url.URL
// Remove the "connect" keyword if it exists
path := strings.TrimSpace(strings.Replace(cmd, "connect", "", -1))
// If they didn't provide a connection string, use the current settings
if path == "" {
path = net.JoinHostPort(c.Host, strconv.Itoa(c.Port))
}
var e error
u, e = client.ParseConnectionString(path, c.Ssl)
if e != nil {
return e
}
config := client.NewConfig()
config.URL = u
config.Username = c.Username
config.Password = c.Password
config.UserAgent = "InfluxDBShell/" + c.ClientVersion
config.Precision = c.Precision
config.UnsafeSsl = c.UnsafeSsl
cl, err := client.NewClient(config)
if err != nil {
return fmt.Errorf("Could not create client %s", err)
}
c.Client = cl
var v string
if _, v, e = c.Client.Ping(); e != nil {
return fmt.Errorf("Failed to connect to %s\n", c.Client.Addr())
}
c.ServerVersion = v
// Update the command with the current connection information
if h, p, err := net.SplitHostPort(config.URL.Host); err == nil {
c.Host = h
if i, err := strconv.Atoi(p); err == nil {
c.Port = i
}
}
return nil
}
// SetAuth sets client authentication credentials
func (c *CommandLine) SetAuth(cmd string) {
// If they pass in the entire command, we should parse it
// auth <username> <password>
args := strings.Fields(cmd)
if len(args) == 3 {
args = args[1:]
} else {
args = []string{}
}
if len(args) == 2 {
c.Username = args[0]
c.Password = args[1]
} else {
u, e := c.Line.Prompt("username: ")
if e != nil {
fmt.Printf("Unable to process input: %s", e)
return
}
c.Username = strings.TrimSpace(u)
p, e := c.Line.PasswordPrompt("password: ")
if e != nil {
fmt.Printf("Unable to process input: %s", e)
return
}
c.Password = p
}
// Update the client as well
c.Client.SetAuth(c.Username, c.Password)
}
func (c *CommandLine) use(cmd string) {
args := strings.Split(strings.TrimSuffix(strings.TrimSpace(cmd), ";"), " ")
if len(args) != 2 {
fmt.Printf("Could not parse database name from %q.\n", cmd)
return
}
d := args[1]
// Validate if specified database exists
response, err := c.Client.Query(client.Query{Command: "SHOW DATABASES"})
if err != nil {
fmt.Printf("ERR: %s\n", err)
return
} else if err := response.Error(); err != nil {
if c.Username == "" {
fmt.Printf("ERR: %s\n", err)
return
}
// TODO(jsternberg): Fix SHOW DATABASES to be user-aware #6397.
// If we are unable to run SHOW DATABASES, display a warning and use the
// database anyway in case the person doesn't have permission to run the
// command, but does have permission to use the database.
fmt.Printf("WARN: %s\n", err)
} else {
// Verify the provided database exists
if databaseExists := func() bool {
for _, result := range response.Results {
for _, row := range result.Series {
if row.Name == "databases" {
for _, values := range row.Values {
for _, database := range values {
if database == d {
return true
}
}
}
}
}
}
return false
}(); !databaseExists {
fmt.Printf("ERR: Database %s doesn't exist. Run SHOW DATABASES for a list of existing databases.\n", d)
return
}
}
c.Database = d
fmt.Printf("Using database %s\n", d)
}
// SetPrecision sets client precision
func (c *CommandLine) SetPrecision(cmd string) {
// Remove the "precision" keyword if it exists
cmd = strings.TrimSpace(strings.Replace(cmd, "precision", "", -1))
// normalize cmd
cmd = strings.ToLower(cmd)
switch cmd {
case "h", "m", "s", "ms", "u", "ns":
c.Precision = cmd
c.Client.SetPrecision(c.Precision)
case "rfc3339":
c.Precision = ""
c.Client.SetPrecision(c.Precision)
default:
fmt.Printf("Unknown precision %q. Please use rfc3339, h, m, s, ms, u or ns.\n", cmd)
}
}
// SetFormat sets output format
func (c *CommandLine) SetFormat(cmd string) {
// Remove the "format" keyword if it exists
cmd = strings.TrimSpace(strings.Replace(cmd, "format", "", -1))
// normalize cmd
cmd = strings.ToLower(cmd)
switch cmd {
case "json", "csv", "column":
c.Format = cmd
default:
fmt.Printf("Unknown format %q. Please use json, csv, or column.\n", cmd)
}
}
// SetWriteConsistency sets cluster consistency level
func (c *CommandLine) SetWriteConsistency(cmd string) {
// Remove the "consistency" keyword if it exists
cmd = strings.TrimSpace(strings.Replace(cmd, "consistency", "", -1))
// normalize cmd
cmd = strings.ToLower(cmd)
_, err := models.ParseConsistencyLevel(cmd)
if err != nil {
fmt.Printf("Unknown consistency level %q. Please use any, one, quorum, or all.\n", cmd)
return
}
c.WriteConsistency = cmd
}
// isWhitespace returns true if the rune is a space, tab, or newline.
func isWhitespace(ch rune) bool { return ch == ' ' || ch == '\t' || ch == '\n' }
// isLetter returns true if the rune is a letter.
func isLetter(ch rune) bool { return (ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') }
// isDigit returns true if the rune is a digit.
func isDigit(ch rune) bool { return (ch >= '0' && ch <= '9') }
// isIdentFirstChar returns true if the rune can be used as the first char in an unquoted identifer.
func isIdentFirstChar(ch rune) bool { return isLetter(ch) || ch == '_' }
// isIdentChar returns true if the rune can be used in an unquoted identifier.
func isNotIdentChar(ch rune) bool { return !(isLetter(ch) || isDigit(ch) || ch == '_') }
func parseUnquotedIdentifier(stmt string) (string, string) {
if fields := strings.FieldsFunc(stmt, isNotIdentChar); len(fields) > 0 {
return fields[0], strings.TrimPrefix(stmt, fields[0])
}
return "", stmt
}
func parseDoubleQuotedIdentifier(stmt string) (string, string) {
escapeNext := false
fields := strings.FieldsFunc(stmt, func(ch rune) bool {
if ch == '\\' {
escapeNext = true
} else if ch == '"' {
if !escapeNext {
return true
}
escapeNext = false
}
return false
})
if len(fields) > 0 {
return fields[0], strings.TrimPrefix(stmt, "\""+fields[0]+"\"")
}
return "", stmt
}
func parseNextIdentifier(stmt string) (ident, remainder string) {
if len(stmt) > 0 {
switch {
case isWhitespace(rune(stmt[0])):
return parseNextIdentifier(stmt[1:])
case isIdentFirstChar(rune(stmt[0])):
return parseUnquotedIdentifier(stmt)
case stmt[0] == '"':
return parseDoubleQuotedIdentifier(stmt)
}
}
return "", stmt
}
func (c *CommandLine) parseInto(stmt string) string {
ident, stmt := parseNextIdentifier(stmt)
if strings.HasPrefix(stmt, ".") {
c.Database = ident
fmt.Printf("Using database %s\n", c.Database)
ident, stmt = parseNextIdentifier(stmt[1:])
}
if strings.HasPrefix(stmt, " ") {
c.RetentionPolicy = ident
fmt.Printf("Using retention policy %s\n", c.RetentionPolicy)
return stmt[1:]
}
return stmt
}
// Insert runs an INSERT statement
func (c *CommandLine) Insert(stmt string) error {
i, point := parseNextIdentifier(stmt)
if !strings.EqualFold(i, "insert") {
fmt.Printf("ERR: found %s, expected INSERT\n", i)
return nil
}
if i, r := parseNextIdentifier(point); strings.EqualFold(i, "into") {
point = c.parseInto(r)
}
_, err := c.Client.Write(client.BatchPoints{
Points: []client.Point{
client.Point{Raw: point},
},
Database: c.Database,
RetentionPolicy: c.RetentionPolicy,
Precision: c.Precision,
WriteConsistency: c.WriteConsistency,
})
if err != nil {
fmt.Printf("ERR: %s\n", err)
if c.Database == "" {
fmt.Println("Note: error may be due to not setting a database or retention policy.")
fmt.Println(`Please set a database with the command "use <database>" or`)
fmt.Println("INSERT INTO <database>.<retention-policy> <point>")
}
return err
}
return nil
}
// query creates a query struct to be used with the client.
func (c *CommandLine) query(query string, database string) client.Query {
return client.Query{
Command: query,
Database: database,
Chunked: true,
}
}
// ExecuteQuery runs any query statement
func (c *CommandLine) ExecuteQuery(query string) error {
response, err := c.Client.Query(c.query(query, c.Database))
if err != nil {
fmt.Printf("ERR: %s\n", err)
return err
}
c.FormatResponse(response, os.Stdout)
if err := response.Error(); err != nil {
fmt.Printf("ERR: %s\n", response.Error())
if c.Database == "" {
fmt.Println("Warning: It is possible this error is due to not setting a database.")
fmt.Println(`Please set a database with the command "use <database>".`)
}
return err
}
return nil
}
// DatabaseToken retrieves database token
func (c *CommandLine) DatabaseToken() (string, error) {
response, err := c.Client.Query(c.query("SHOW DIAGNOSTICS for 'registration'", ""))
if err != nil {
return "", err
}
if response.Error() != nil || len(response.Results) == 0 || len(response.Results[0].Series) == 0 {
return "", nil
}
// Look for position of "token" column.
for i, s := range (*response).Results[0].Series[0].Columns {
if s == "token" {
return (*response).Results[0].Series[0].Values[0][i].(string), nil
}
}
return "", nil
}
// FormatResponse formats output to previsouly chosen format
func (c *CommandLine) FormatResponse(response *client.Response, w io.Writer) {
switch c.Format {
case "json":
c.writeJSON(response, w)
case "csv":
c.writeCSV(response, w)
case "column":
c.writeColumns(response, w)
default:
fmt.Fprintf(w, "Unknown output format %q.\n", c.Format)
}
}
func (c *CommandLine) writeJSON(response *client.Response, w io.Writer) {
var data []byte
var err error
if c.Pretty {
data, err = json.MarshalIndent(response, "", " ")
} else {
data, err = json.Marshal(response)
}
if err != nil {
fmt.Fprintf(w, "Unable to parse json: %s\n", err)
return
}
fmt.Fprintln(w, string(data))
}
func (c *CommandLine) writeCSV(response *client.Response, w io.Writer) {
csvw := csv.NewWriter(w)
for _, result := range response.Results {
// Create a tabbed writer for each result as they won't always line up
rows := c.formatResults(result, "\t")
for _, r := range rows {
csvw.Write(strings.Split(r, "\t"))
}
csvw.Flush()
}
}
func (c *CommandLine) writeColumns(response *client.Response, w io.Writer) {
// Create a tabbed writer for each result as they won't always line up
writer := new(tabwriter.Writer)
writer.Init(w, 0, 8, 1, '\t', 0)
for _, result := range response.Results {
// Print out all messages first
for _, m := range result.Messages {
fmt.Fprintf(w, "%s: %s.\n", m.Level, m.Text)
}
csv := c.formatResults(result, "\t")
for _, r := range csv {
fmt.Fprintln(writer, r)
}
writer.Flush()
}
}
// formatResults will behave differently if you are formatting for columns or csv
func (c *CommandLine) formatResults(result client.Result, separator string) []string {
rows := []string{}
// Create a tabbed writer for each result as they won't always line up
for i, row := range result.Series {
// gather tags
tags := []string{}
for k, v := range row.Tags {
tags = append(tags, fmt.Sprintf("%s=%s", k, v))
sort.Strings(tags)
}
columnNames := []string{}
// Only put name/tags in a column if format is csv
if c.Format == "csv" {
if len(tags) > 0 {
columnNames = append([]string{"tags"}, columnNames...)
}
if row.Name != "" {
columnNames = append([]string{"name"}, columnNames...)
}
}
for _, column := range row.Columns {
columnNames = append(columnNames, column)
}
// Output a line separator if we have more than one set or results and format is column
if i > 0 && c.Format == "column" {
rows = append(rows, "")
}
// If we are column format, we break out the name/tag to separate lines
if c.Format == "column" {
if row.Name != "" {
n := fmt.Sprintf("name: %s", row.Name)
rows = append(rows, n)
}
if len(tags) > 0 {
t := fmt.Sprintf("tags: %s", (strings.Join(tags, ", ")))
rows = append(rows, t)
}
}
rows = append(rows, strings.Join(columnNames, separator))
// if format is column, write dashes under each column
if c.Format == "column" {
lines := []string{}
for _, columnName := range columnNames {
lines = append(lines, strings.Repeat("-", len(columnName)))
}
rows = append(rows, strings.Join(lines, separator))
}
for _, v := range row.Values {
var values []string
if c.Format == "csv" {
if row.Name != "" {
values = append(values, row.Name)
}
if len(tags) > 0 {
values = append(values, strings.Join(tags, ","))
}
}
for _, vv := range v {
values = append(values, interfaceToString(vv))
}
rows = append(rows, strings.Join(values, separator))
}
// Output a line separator if in column format
if c.Format == "column" {
rows = append(rows, "")
}
}
return rows
}
func interfaceToString(v interface{}) string {
switch t := v.(type) {
case nil:
return ""
case bool:
return fmt.Sprintf("%v", v)
case int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64, uintptr:
return fmt.Sprintf("%d", t)
case float32, float64:
return fmt.Sprintf("%v", t)
default:
return fmt.Sprintf("%v", t)
}
}
// Settings prints current settings
func (c *CommandLine) Settings() {
w := new(tabwriter.Writer)
w.Init(os.Stdout, 0, 1, 1, '\t', 0)
if c.Port > 0 {
fmt.Fprintf(w, "Host\t%s:%d\n", c.Host, c.Port)
} else {
fmt.Fprintf(w, "Host\t%s\n", c.Host)
}
fmt.Fprintf(w, "Username\t%s\n", c.Username)
fmt.Fprintf(w, "Database\t%s\n", c.Database)
fmt.Fprintf(w, "Pretty\t%v\n", c.Pretty)
fmt.Fprintf(w, "Format\t%s\n", c.Format)
fmt.Fprintf(w, "Write Consistency\t%s\n", c.WriteConsistency)
fmt.Fprintln(w)
w.Flush()
}
func (c *CommandLine) help() {
fmt.Println(`Usage:
connect <host:port> connects to another node specified by host:port
auth prompts for username and password
pretty toggles pretty print for the json format
use <db_name> sets current database
format <format> specifies the format of the server responses: json, csv, or column
precision <format> specifies the format of the timestamp: rfc3339, h, m, s, ms, u or ns
consistency <level> sets write consistency level: any, one, quorum, or all
history displays command history
settings outputs the current settings for the shell
exit/quit/ctrl+d quits the influx shell
show databases show database names
show series show series information
show measurements show measurement information
show tag keys show tag key information
show field keys show field key information
A full list of influxql commands can be found at:
https://docs.influxdata.com/influxdb/latest/query_language/spec/
`)
}
func (c *CommandLine) history() {
var buf bytes.Buffer
c.Line.WriteHistory(&buf)
fmt.Print(buf.String())
}
func (c *CommandLine) saveHistory() {
if historyFile, err := os.Create(c.historyFilePath); err != nil {
fmt.Printf("There was an error writing history file: %s\n", err)
} else {
c.Line.WriteHistory(historyFile)
historyFile.Close()
}
}
func (c *CommandLine) gopher() {
fmt.Println(`
.-::-::://:-::- .:/++/'
'://:-''/oo+//++o+/.://o- ./+:
.:-. '++- .o/ '+yydhy' o-
.:/. .h: :osoys .smMN- :/
-/:.' s- /MMMymh. '/y/ s'
-+s:'''' d -mMMms// '-/o:
-/++/++/////:. o: '... s- :s.
:+-+s-' ':/' 's- /+ 'o:
'+-'o: /ydhsh. '//. '-o- o-
.y. o: .MMMdm+y ':+++:::/+:.' s:
.-h/ y- 'sdmds'h -+ydds:::-.' 'h.
.//-.d' o: '.' 'dsNMMMNh:.:++' :y
+y. 'd 's. .s:mddds: ++ o/
'N- odd 'o/. './o-s-' .---+++' o-
'N' yNd .://:/:::::. -s -+/s/./s' 'o/'
so' .h '''' ////s: '+. .s +y'
os/-.y' 's' 'y::+ +d'
'.:o/ -+:-:.' so.---.'
o' 'd-.''/s'
.s' :y.''.y
-s mo:::'
:: yh
// '''' /M'
o+ .s///:/. 'N:
:+ /: -s' ho
's- -/s/:+/.+h' +h
ys' ':' '-. -d
oh .h
/o .s
s. .h
-y .d
m/ -h
+d /o
'N- y:
h: m.
s- -d
o- s+
+- 'm'
s/ oo--.
y- /s ':+'
s' 'od--' .d:
-+ ':o: ':+-/+
y- .:+- '
//o- '.:+/.
.-:+/' ''-/+/.
./:' ''.:o+/-'
.+o:/:/+-' ''.-+ooo/-'
o: -h///++////-.
/: .o/
//+ 'y
./sooy.
`)
}
// Version prints CLI version
func (c *CommandLine) Version() {
fmt.Println("InfluxDB shell version:", c.ClientVersion)
}
func (c *CommandLine) exit() {
// write to history file
c.saveHistory()
// release line resources
c.Line.Close()
c.Line = nil
}