telegraf/plugins/inputs/net_response/net_response.go

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package net_response
import (
"bufio"
"errors"
"net"
"net/textproto"
"regexp"
"time"
"github.com/influxdata/telegraf"
"github.com/influxdata/telegraf/internal"
"github.com/influxdata/telegraf/plugins/inputs"
)
type ResultType uint64
const (
Success ResultType = 0
Timeout = 1
ConnectionFailed = 2
ReadFailed = 3
StringMismatch = 4
)
// NetResponse struct
type NetResponse struct {
Address string
Timeout internal.Duration
ReadTimeout internal.Duration
Send string
Expect string
Protocol string
}
var description = "Collect response time of a TCP or UDP connection"
// Description will return a short string to explain what the plugin does.
func (*NetResponse) Description() string {
return description
}
var sampleConfig = `
## Protocol, must be "tcp" or "udp"
## NOTE: because the "udp" protocol does not respond to requests, it requires
## a send/expect string pair (see below).
protocol = "tcp"
## Server address (default localhost)
address = "localhost:80"
## Set timeout
# timeout = "1s"
## Set read timeout (only used if expecting a response)
# read_timeout = "1s"
## The following options are required for UDP checks. For TCP, they are
## optional. The plugin will send the given string to the server and then
## expect to receive the given 'expect' string back.
## string sent to the server
# send = "ssh"
## expected string in answer
# expect = "ssh"
## Uncomment to remove deprecated fields
# fieldexclude = ["result_type", "string_found"]
`
// SampleConfig will return a complete configuration example with details about each field.
func (*NetResponse) SampleConfig() string {
return sampleConfig
}
// TCPGather will execute if there are TCP tests defined in the configuration.
// It will return a map[string]interface{} for fields and a map[string]string for tags
func (n *NetResponse) TCPGather() (tags map[string]string, fields map[string]interface{}) {
// Prepare returns
tags = make(map[string]string)
fields = make(map[string]interface{})
// Start Timer
start := time.Now()
// Connecting
conn, err := net.DialTimeout("tcp", n.Address, n.Timeout.Duration)
// Stop timer
responseTime := time.Since(start).Seconds()
// Handle error
if err != nil {
if e, ok := err.(net.Error); ok && e.Timeout() {
setResult(Timeout, fields, tags, n.Expect)
} else {
setResult(ConnectionFailed, fields, tags, n.Expect)
}
return tags, fields
}
defer conn.Close()
// Send string if needed
if n.Send != "" {
msg := []byte(n.Send)
conn.Write(msg)
// Stop timer
responseTime = time.Since(start).Seconds()
}
// Read string if needed
if n.Expect != "" {
// Set read timeout
conn.SetReadDeadline(time.Now().Add(n.ReadTimeout.Duration))
// Prepare reader
reader := bufio.NewReader(conn)
tp := textproto.NewReader(reader)
// Read
data, err := tp.ReadLine()
// Stop timer
responseTime = time.Since(start).Seconds()
// Handle error
if err != nil {
setResult(ReadFailed, fields, tags, n.Expect)
} else {
// Looking for string in answer
RegEx := regexp.MustCompile(`.*` + n.Expect + `.*`)
find := RegEx.FindString(string(data))
if find != "" {
setResult(Success, fields, tags, n.Expect)
} else {
setResult(StringMismatch, fields, tags, n.Expect)
}
}
} else {
setResult(Success, fields, tags, n.Expect)
}
fields["response_time"] = responseTime
return tags, fields
}
// UDPGather will execute if there are UDP tests defined in the configuration.
// It will return a map[string]interface{} for fields and a map[string]string for tags
func (n *NetResponse) UDPGather() (tags map[string]string, fields map[string]interface{}) {
// Prepare returns
tags = make(map[string]string)
fields = make(map[string]interface{})
// Start Timer
start := time.Now()
// Resolving
udpAddr, err := net.ResolveUDPAddr("udp", n.Address)
LocalAddr, err := net.ResolveUDPAddr("udp", "127.0.0.1:0")
// Connecting
conn, err := net.DialUDP("udp", LocalAddr, udpAddr)
// Handle error
if err != nil {
setResult(ConnectionFailed, fields, tags, n.Expect)
return tags, fields
}
defer conn.Close()
// Send string
msg := []byte(n.Send)
conn.Write(msg)
// Read string
// Set read timeout
conn.SetReadDeadline(time.Now().Add(n.ReadTimeout.Duration))
// Read
buf := make([]byte, 1024)
_, _, err = conn.ReadFromUDP(buf)
// Stop timer
responseTime := time.Since(start).Seconds()
// Handle error
if err != nil {
setResult(ReadFailed, fields, tags, n.Expect)
return tags, fields
}
// Looking for string in answer
RegEx := regexp.MustCompile(`.*` + n.Expect + `.*`)
find := RegEx.FindString(string(buf))
if find != "" {
setResult(Success, fields, tags, n.Expect)
} else {
setResult(StringMismatch, fields, tags, n.Expect)
}
fields["response_time"] = responseTime
return tags, fields
}
// Gather is called by telegraf when the plugin is executed on its interval.
// It will call either UDPGather or TCPGather based on the configuration and
// also fill an Accumulator that is supplied.
func (n *NetResponse) Gather(acc telegraf.Accumulator) error {
// Set default values
if n.Timeout.Duration == 0 {
n.Timeout.Duration = time.Second
}
if n.ReadTimeout.Duration == 0 {
n.ReadTimeout.Duration = time.Second
}
// Check send and expected string
if n.Protocol == "udp" && n.Send == "" {
return errors.New("Send string cannot be empty")
}
if n.Protocol == "udp" && n.Expect == "" {
return errors.New("Expected string cannot be empty")
}
// Prepare host and port
host, port, err := net.SplitHostPort(n.Address)
if err != nil {
return err
}
if host == "" {
n.Address = "localhost:" + port
}
if port == "" {
return errors.New("Bad port")
}
// Prepare data
2016-03-10 19:41:03 +00:00
tags := map[string]string{"server": host, "port": port}
var fields map[string]interface{}
var returnTags map[string]string
// Gather data
if n.Protocol == "tcp" {
returnTags, fields = n.TCPGather()
tags["protocol"] = "tcp"
} else if n.Protocol == "udp" {
returnTags, fields = n.UDPGather()
tags["protocol"] = "udp"
} else {
return errors.New("Bad protocol")
}
for key, value := range returnTags {
tags[key] = value
}
// Merge the tags
for k, v := range returnTags {
tags[k] = v
}
// Add metrics
acc.AddFields("net_response", fields, tags)
return nil
}
func setResult(result ResultType, fields map[string]interface{}, tags map[string]string, expect string) {
var tag string
switch result {
case Success:
tag = "success"
case Timeout:
tag = "timeout"
case ConnectionFailed:
tag = "connection_failed"
case ReadFailed:
tag = "read_failed"
case StringMismatch:
tag = "string_mismatch"
}
tags["result"] = tag
fields["result_code"] = uint64(result)
// deprecated in 1.7; use result tag
fields["result_type"] = tag
// deprecated in 1.4; use result tag
if expect != "" {
fields["string_found"] = result == Success
}
}
func init() {
inputs.Add("net_response", func() telegraf.Input {
return &NetResponse{}
})
}