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main.go
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main.go
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package main
import (
"encoding/csv"
"encoding/json"
"flag"
"fmt"
"io"
"net/url"
"os"
"os/user"
"path/filepath"
"strconv"
"strings"
"text/tabwriter"
"github.com/influxdb/influxdb/client"
"github.com/peterh/liner"
)
// These variables are populated via the Go linker.
var (
version string = "0.9"
)
const (
default_host = "localhost"
default_port = 8086
default_format = "column"
)
type CommandLine struct {
Client *client.Client
Line *liner.State
Host string
Port int
Username string
Password string
Database string
Version string
Pretty bool // controls pretty print for json
Format string // controls the output format. Valid values are json, csv, or column
}
func main() {
c := CommandLine{}
fs := flag.NewFlagSet("default", flag.ExitOnError)
fs.StringVar(&c.Host, "host", default_host, "influxdb host to connect to")
fs.IntVar(&c.Port, "port", default_port, "influxdb port to connect to")
fs.StringVar(&c.Username, "username", c.Username, "username to connect to the server.")
fs.StringVar(&c.Password, "password", c.Password, `password to connect to the server. Leaving blank will prompt for password (--password="")`)
fs.StringVar(&c.Database, "database", c.Database, "database to connect to the server.")
fs.StringVar(&c.Format, "output", default_format, "format specifies the format of the server responses: json, csv, or column")
fs.Parse(os.Args[1:])
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
}
}
// TODO Determine if we are an ineractive shell or running commands
fmt.Println("InfluxDB shell " + version)
c.Line = liner.NewLiner()
defer c.Line.Close()
if promptForPassword {
p, e := c.Line.PasswordPrompt("password: ")
if e != nil {
fmt.Println("Unable to parse password.")
} else {
c.Password = p
}
}
c.connect("")
var historyFile string
usr, err := user.Current()
// Only load history if we can get the user
if err == nil {
historyFile = filepath.Join(usr.HomeDir, ".influx_history")
if f, err := os.Open(historyFile); err == nil {
c.Line.ReadHistory(f)
f.Close()
}
}
for {
l, e := c.Line.Prompt("> ")
if e != nil {
break
}
if !c.ParseCommand(l) {
// write out the history
if f, err := os.Create(historyFile); err == nil {
c.Line.WriteHistory(f)
f.Close()
}
break
}
c.Line.AppendHistory(l)
}
}
func (c *CommandLine) ParseCommand(cmd string) bool {
lcmd := strings.TrimSpace(strings.ToLower(cmd))
switch {
case strings.HasPrefix(lcmd, "exit"):
// signal the program to exit
return false
case strings.HasPrefix(lcmd, "gopher"):
gopher()
case strings.HasPrefix(lcmd, "connect"):
c.connect(cmd)
case strings.HasPrefix(lcmd, "auth"):
c.SetAuth()
case strings.HasPrefix(lcmd, "help"):
help()
case strings.HasPrefix(lcmd, "format"):
c.SetFormat(cmd)
case strings.HasPrefix(lcmd, "settings"):
c.Settings()
case strings.HasPrefix(lcmd, "pretty"):
c.Pretty = !c.Pretty
if c.Pretty {
fmt.Println("Pretty print enabled")
} else {
fmt.Println("Pretty print disabled")
}
case strings.HasPrefix(lcmd, "use"):
c.use(cmd)
case lcmd == "":
break
default:
c.executeQuery(cmd)
}
return true
}
func (c *CommandLine) connect(cmd string) {
var cl *client.Client
if cmd != "" {
// Remove the "connect" keyword if it exists
cmd = strings.TrimSpace(strings.Replace(cmd, "connect", "", -1))
if cmd == "" {
return
}
if strings.Contains(cmd, ":") {
h := strings.Split(cmd, ":")
if i, e := strconv.Atoi(h[1]); e != nil {
fmt.Printf("Connect error: Invalid port number %q: %s\n", cmd, e)
return
} else {
c.Port = i
}
if h[0] == "" {
c.Host = default_host
} else {
c.Host = h[0]
}
} else {
c.Host = cmd
// If they didn't specify a port, always use the default port
c.Port = default_port
}
}
u := url.URL{
Scheme: "http",
}
if c.Port > 0 {
u.Host = fmt.Sprintf("%s:%d", c.Host, c.Port)
} else {
u.Host = c.Host
}
if c.Username != "" {
u.User = url.UserPassword(c.Username, c.Password)
}
cl, err := client.NewClient(
client.Config{
URL: u,
Username: c.Username,
Password: c.Password,
UserAgent: "InfluxDBShell/" + version,
})
if err != nil {
fmt.Printf("Could not create client %s", err)
return
}
c.Client = cl
if _, v, e := c.Client.Ping(); e != nil {
fmt.Printf("Failed to connect to %s\n", c.Client.Addr())
} else {
c.Version = v
fmt.Printf("Connected to %s version %s\n", c.Client.Addr(), c.Version)
}
}
func (c *CommandLine) SetAuth() {
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
}
func (c *CommandLine) use(cmd string) {
args := strings.Split(strings.TrimSpace(cmd), " ")
if len(args) != 2 {
fmt.Printf("Could not parse database name from %q.\n", cmd)
return
}
d := args[1]
c.Database = d
fmt.Printf("Using database %s\n", d)
}
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)
}
}
func (c *CommandLine) executeQuery(query string) {
results, err := c.Client.Query(client.Query{Command: query, Database: c.Database})
if err != nil {
fmt.Printf("ERR: %s\n", err)
return
}
c.FormatResults(results, os.Stdout)
if results.Error() != nil {
fmt.Printf("ERR: %s\n", results.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>".`)
}
}
}
func (c *CommandLine) FormatResults(results *client.Results, w io.Writer) {
switch c.Format {
case "json":
WriteJSON(results, c.Pretty, w)
case "csv":
WriteCSV(results, w)
case "column":
WriteColumns(results, w)
default:
fmt.Fprintf(w, "Unknown output format %q.\n", c.Format)
}
}
func WriteJSON(results *client.Results, pretty bool, w io.Writer) {
var data []byte
var err error
if pretty {
data, err = json.MarshalIndent(results, "", " ")
} else {
data, err = json.Marshal(results)
}
if err != nil {
fmt.Fprintf(w, "Unable to parse json: %s\n", err)
return
}
fmt.Fprintln(w, string(data))
}
func WriteCSV(results *client.Results, w io.Writer) {
csvw := csv.NewWriter(w)
for _, result := range results.Results {
// Create a tabbed writer for each result as they won't always line up
rows := resultToCSV(result, "\t", false)
for _, r := range rows {
csvw.Write(strings.Split(r, "\t"))
}
csvw.Flush()
}
}
func WriteColumns(results *client.Results, w io.Writer) {
for _, result := range results.Results {
// Create a tabbed writer for each result a they won't always line up
w := new(tabwriter.Writer)
w.Init(os.Stdout, 0, 8, 1, '\t', 0)
csv := resultToCSV(result, "\t", true)
for _, r := range csv {
fmt.Fprintln(w, r)
}
w.Flush()
}
}
func resultToCSV(result client.Result, seperator string, headerLines bool) []string {
rows := []string{}
// Create a tabbed writer for each result a they won't always line up
columnNames := []string{"name", "tags"}
for i, row := range result.Series {
// Output the column headings
if i == 0 {
for _, column := range row.Columns {
columnNames = append(columnNames, column)
}
rows = append(rows, strings.Join(columnNames, seperator))
}
if headerLines {
// create column underscores
lines := []string{}
for _, columnName := range columnNames {
lines = append(lines, strings.Repeat("-", len(columnName)))
}
rows = append(rows, strings.Join(lines, seperator))
}
// gather tags
tags := []string{}
for k, v := range row.Tags {
tags = append(tags, fmt.Sprintf("%s=%s", k, v))
}
for _, v := range row.Values {
values := []string{row.Name}
values = append(values, strings.Join(tags, ","))
for _, vv := range v {
values = append(values, interfaceToString(vv))
}
rows = append(rows, strings.Join(values, seperator))
}
}
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)
}
}
func (c *CommandLine) Settings() {
w := new(tabwriter.Writer)
w.Init(os.Stdout, 0, 8, 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.Fprintln(w)
w.Flush()
}
func help() {
fmt.Println(`Usage:
connect <host:port> connect to another node
auth prompt for username and password
pretty toggle pretty print
use <db_name> set current databases
format <format> set the output format: json, csv, or column
settings output the current settings for the shell
exit quit 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 tag values show tag value information
a full list of influxql commands can be found at:
http://influxdb.com/docs
`)
}
func 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.
`)
}