| // Copyright 2015 CoreOS, Inc. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package capnslog |
| |
| import ( |
| "bufio" |
| "bytes" |
| "io" |
| "os" |
| "runtime" |
| "strconv" |
| "strings" |
| "time" |
| ) |
| |
| var pid = os.Getpid() |
| |
| type GlogFormatter struct { |
| StringFormatter |
| } |
| |
| func NewGlogFormatter(w io.Writer) *GlogFormatter { |
| g := &GlogFormatter{} |
| g.w = bufio.NewWriter(w) |
| return g |
| } |
| |
| func (g GlogFormatter) Format(pkg string, level LogLevel, depth int, entries ...interface{}) { |
| g.w.Write(GlogHeader(level, depth+1)) |
| g.StringFormatter.Format(pkg, level, depth+1, entries...) |
| } |
| |
| func GlogHeader(level LogLevel, depth int) []byte { |
| // Lmmdd hh:mm:ss.uuuuuu threadid file:line] |
| now := time.Now().UTC() |
| _, file, line, ok := runtime.Caller(depth) // It's always the same number of frames to the user's call. |
| if !ok { |
| file = "???" |
| line = 1 |
| } else { |
| slash := strings.LastIndex(file, "/") |
| if slash >= 0 { |
| file = file[slash+1:] |
| } |
| } |
| if line < 0 { |
| line = 0 // not a real line number |
| } |
| buf := &bytes.Buffer{} |
| buf.Grow(30) |
| _, month, day := now.Date() |
| hour, minute, second := now.Clock() |
| buf.WriteString(level.Char()) |
| twoDigits(buf, int(month)) |
| twoDigits(buf, day) |
| buf.WriteByte(' ') |
| twoDigits(buf, hour) |
| buf.WriteByte(':') |
| twoDigits(buf, minute) |
| buf.WriteByte(':') |
| twoDigits(buf, second) |
| buf.WriteByte('.') |
| buf.WriteString(strconv.Itoa(now.Nanosecond() / 1000)) |
| buf.WriteByte('Z') |
| buf.WriteByte(' ') |
| buf.WriteString(strconv.Itoa(pid)) |
| buf.WriteByte(' ') |
| buf.WriteString(file) |
| buf.WriteByte(':') |
| buf.WriteString(strconv.Itoa(line)) |
| buf.WriteByte(']') |
| buf.WriteByte(' ') |
| return buf.Bytes() |
| } |
| |
| const digits = "0123456789" |
| |
| func twoDigits(b *bytes.Buffer, d int) { |
| c2 := digits[d%10] |
| d /= 10 |
| c1 := digits[d%10] |
| b.WriteByte(c1) |
| b.WriteByte(c2) |
| } |