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example_test.go
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package nontransparent
import (
"io"
"math/rand"
"strings"
"time"
"github.com/davecgh/go-spew/spew"
"github.com/leodido/go-syslog/v4"
"github.com/leodido/go-syslog/v4/rfc3164"
"github.com/leodido/go-syslog/v4/rfc5424"
)
func Example_withoutTrailerAtEnd() {
results := []syslog.Result{}
acc := func(res *syslog.Result) {
results = append(results, *res)
}
// Notice the message ends without trailer but we catch it anyway
r := strings.NewReader("<1>1 2003-10-11T22:14:15.003Z host.local - - - - mex")
NewParser(syslog.WithListener(acc)).Parse(r)
output(results)
// Output:
// ([]syslog.Result) (len=1) {
// (syslog.Result) {
// Message: (syslog.Message) <nil>,
// Error: (*ragel.ReadingError)(unexpected EOF)
// }
// }
}
func Example_withCurrentYear_RFC3164() {
results := []syslog.Result{}
acc := func(res *syslog.Result) {
if res != nil {
// Force year to match the one in the comment below
x, _ := res.Message.(*rfc3164.SyslogMessage)
x.Timestamp = func(t1 *time.Time) *time.Time {
currentY := time.Now().Year()
t2 := t1.AddDate(2021-currentY, 0, 0)
return &t2
}(x.Timestamp)
newRes := syslog.Result{Message: x, Error: res.Error}
results = append(results, newRes)
}
}
// Notice the message ends without trailer but we catch it anyway
r := strings.NewReader("<13>Dec 2 16:31:03 host app: Test\n")
NewParserRFC3164(
syslog.WithListener(acc),
syslog.WithMachineOptions(rfc3164.WithYear(rfc3164.CurrentYear{})),
).Parse(r)
output(results)
// Output:
// ([]syslog.Result) (len=1) {
// (syslog.Result) {
// Message: (*rfc3164.SyslogMessage)({
// Base: (syslog.Base) {
// Facility: (*uint8)(1),
// Severity: (*uint8)(5),
// Priority: (*uint8)(13),
// Timestamp: (*time.Time)(2021-12-02 16:31:03 +0000 UTC),
// Hostname: (*string)((len=4) "host"),
// Appname: (*string)((len=3) "app"),
// ProcID: (*string)(<nil>),
// MsgID: (*string)(<nil>),
// Message: (*string)((len=4) "Test")
// }
// }),
// Error: (error) <nil>
// }
// }
}
func Example_bestEffortWithoutTrailerAtEnd() {
results := []syslog.Result{}
acc := func(res *syslog.Result) {
results = append(results, *res)
}
// Notice the message ends without trailer but we catch it anyway
r := strings.NewReader("<1>1 2003-10-11T22:14:15.003Z host.local - - - - mex")
NewParser(syslog.WithMachineOptions(rfc5424.WithBestEffort()), syslog.WithListener(acc)).Parse(r)
output(results)
// Output:
// ([]syslog.Result) (len=1) {
// (syslog.Result) {
// Message: (*rfc5424.SyslogMessage)({
// Base: (syslog.Base) {
// Facility: (*uint8)(0),
// Severity: (*uint8)(1),
// Priority: (*uint8)(1),
// Timestamp: (*time.Time)(2003-10-11 22:14:15.003 +0000 UTC),
// Hostname: (*string)((len=10) "host.local"),
// Appname: (*string)(<nil>),
// ProcID: (*string)(<nil>),
// MsgID: (*string)(<nil>),
// Message: (*string)((len=3) "mex")
// },
// Version: (uint16) 1,
// StructuredData: (*map[string]map[string]string)(<nil>)
// }),
// Error: (error) <nil>
// }
// }
}
func Example_bestEffortOnLastOne() {
results := []syslog.Result{}
acc := func(res *syslog.Result) {
results = append(results, *res)
}
r := strings.NewReader("<1>1 - - - - - - -\n<3>1\n")
NewParser(syslog.WithMachineOptions(rfc5424.WithBestEffort()), syslog.WithListener(acc)).Parse(r)
output(results)
// Output:
// ([]syslog.Result) (len=2) {
// (syslog.Result) {
// Message: (*rfc5424.SyslogMessage)({
// Base: (syslog.Base) {
// Facility: (*uint8)(0),
// Severity: (*uint8)(1),
// Priority: (*uint8)(1),
// Timestamp: (*time.Time)(<nil>),
// Hostname: (*string)(<nil>),
// Appname: (*string)(<nil>),
// ProcID: (*string)(<nil>),
// MsgID: (*string)(<nil>),
// Message: (*string)((len=1) "-")
// },
// Version: (uint16) 1,
// StructuredData: (*map[string]map[string]string)(<nil>)
// }),
// Error: (error) <nil>
// },
// (syslog.Result) {
// Message: (*rfc5424.SyslogMessage)({
// Base: (syslog.Base) {
// Facility: (*uint8)(0),
// Severity: (*uint8)(3),
// Priority: (*uint8)(3),
// Timestamp: (*time.Time)(<nil>),
// Hostname: (*string)(<nil>),
// Appname: (*string)(<nil>),
// ProcID: (*string)(<nil>),
// MsgID: (*string)(<nil>),
// Message: (*string)(<nil>)
// },
// Version: (uint16) 1,
// StructuredData: (*map[string]map[string]string)(<nil>)
// }),
// Error: (*errors.errorString)(parsing error [col 4])
// }
// }
}
func Example_intoChannelWithLF() {
messages := []string{
"<2>1 - - - - - - A\nB",
"<1>1 -",
"<1>1 - - - - - - A\nB\nC\nD",
}
r, w := io.Pipe()
go func() {
defer w.Close()
for _, m := range messages {
// Write message (containing trailers to be interpreted as part of the syslog MESSAGE)
w.Write([]byte(m))
// Write non-transparent frame boundary
w.Write([]byte{10})
// Wait a random amount of time
time.Sleep(time.Millisecond * time.Duration(rand.Intn(100)))
}
}()
results := make(chan *syslog.Result)
ln := func(x *syslog.Result) {
// Emit the result
results <- x
}
p := NewParser(syslog.WithListener(ln), syslog.WithMachineOptions(rfc5424.WithBestEffort()))
go func() {
defer close(results)
defer r.Close()
p.Parse(r)
}()
// Consume results
for r := range results {
output(r)
}
// Output:
// (*syslog.Result)({
// Message: (*rfc5424.SyslogMessage)({
// Base: (syslog.Base) {
// Facility: (*uint8)(0),
// Severity: (*uint8)(2),
// Priority: (*uint8)(2),
// Timestamp: (*time.Time)(<nil>),
// Hostname: (*string)(<nil>),
// Appname: (*string)(<nil>),
// ProcID: (*string)(<nil>),
// MsgID: (*string)(<nil>),
// Message: (*string)((len=3) "A\nB")
// },
// Version: (uint16) 1,
// StructuredData: (*map[string]map[string]string)(<nil>)
// }),
// Error: (error) <nil>
// })
// (*syslog.Result)({
// Message: (*rfc5424.SyslogMessage)({
// Base: (syslog.Base) {
// Facility: (*uint8)(0),
// Severity: (*uint8)(1),
// Priority: (*uint8)(1),
// Timestamp: (*time.Time)(<nil>),
// Hostname: (*string)(<nil>),
// Appname: (*string)(<nil>),
// ProcID: (*string)(<nil>),
// MsgID: (*string)(<nil>),
// Message: (*string)(<nil>)
// },
// Version: (uint16) 1,
// StructuredData: (*map[string]map[string]string)(<nil>)
// }),
// Error: (*errors.errorString)(parsing error [col 6])
// })
// (*syslog.Result)({
// Message: (*rfc5424.SyslogMessage)({
// Base: (syslog.Base) {
// Facility: (*uint8)(0),
// Severity: (*uint8)(1),
// Priority: (*uint8)(1),
// Timestamp: (*time.Time)(<nil>),
// Hostname: (*string)(<nil>),
// Appname: (*string)(<nil>),
// ProcID: (*string)(<nil>),
// MsgID: (*string)(<nil>),
// Message: (*string)((len=7) "A\nB\nC\nD")
// },
// Version: (uint16) 1,
// StructuredData: (*map[string]map[string]string)(<nil>)
// }),
// Error: (error) <nil>
// })
}
func Example_intoChannelWithNUL() {
messages := []string{
"<2>1 - - - - - - A\x00B",
"<1>1 -",
"<1>1 - - - - - - A\x00B\x00C\x00D",
}
r, w := io.Pipe()
go func() {
defer w.Close()
for _, m := range messages {
// Write message (containing trailers to be interpreted as part of the syslog MESSAGE)
w.Write([]byte(m))
// Write non-transparent frame boundary
w.Write([]byte{0})
// Wait a random amount of time
time.Sleep(time.Millisecond * time.Duration(rand.Intn(100)))
}
}()
results := make(chan *syslog.Result)
ln := func(x *syslog.Result) {
// Emit the result
results <- x
}
p := NewParser(syslog.WithListener(ln), WithTrailer(NUL))
go func() {
defer close(results)
defer r.Close()
p.Parse(r)
}()
// Range over the results channel
for r := range results {
output(r)
}
// Output:
// (*syslog.Result)({
// Message: (*rfc5424.SyslogMessage)({
// Base: (syslog.Base) {
// Facility: (*uint8)(0),
// Severity: (*uint8)(2),
// Priority: (*uint8)(2),
// Timestamp: (*time.Time)(<nil>),
// Hostname: (*string)(<nil>),
// Appname: (*string)(<nil>),
// ProcID: (*string)(<nil>),
// MsgID: (*string)(<nil>),
// Message: (*string)((len=3) "A\x00B")
// },
// Version: (uint16) 1,
// StructuredData: (*map[string]map[string]string)(<nil>)
// }),
// Error: (error) <nil>
// })
// (*syslog.Result)({
// Message: (syslog.Message) <nil>,
// Error: (*errors.errorString)(parsing error [col 6])
// })
// (*syslog.Result)({
// Message: (*rfc5424.SyslogMessage)({
// Base: (syslog.Base) {
// Facility: (*uint8)(0),
// Severity: (*uint8)(1),
// Priority: (*uint8)(1),
// Timestamp: (*time.Time)(<nil>),
// Hostname: (*string)(<nil>),
// Appname: (*string)(<nil>),
// ProcID: (*string)(<nil>),
// MsgID: (*string)(<nil>),
// Message: (*string)((len=7) "A\x00B\x00C\x00D")
// },
// Version: (uint16) 1,
// StructuredData: (*map[string]map[string]string)(<nil>)
// }),
// Error: (error) <nil>
// })
}
func output(out interface{}) {
spew.Config.DisableCapacities = true
spew.Config.DisablePointerAddresses = true
spew.Dump(out)
}