File: config.go

package info (click to toggle)
golang-log4go 0.0~hg48-1
  • links: PTS, VCS
  • area: main
  • in suites: jessie, jessie-kfreebsd
  • size: 168 kB
  • ctags: 154
  • sloc: xml: 35; makefile: 27
file content (288 lines) | stat: -rw-r--r-- 7,787 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
// Copyright (C) 2010, Kyle Lemons <kyle@kylelemons.net>.  All rights reserved.

package log4go

import (
	"encoding/xml"
	"fmt"
	"io/ioutil"
	"os"
	"strconv"
	"strings"
)

type xmlProperty struct {
	Name  string `xml:"name,attr"`
	Value string `xml:",chardata"`
}

type xmlFilter struct {
	Enabled  string        `xml:"enabled,attr"`
	Tag      string        `xml:"tag"`
	Level    string        `xml:"level"`
	Type     string        `xml:"type"`
	Property []xmlProperty `xml:"property"`
}

type xmlLoggerConfig struct {
	Filter []xmlFilter `xml:"filter"`
}

// Load XML configuration; see examples/example.xml for documentation
func (log Logger) LoadConfiguration(filename string) {
	log.Close()

	// Open the configuration file
	fd, err := os.Open(filename)
	if err != nil {
		fmt.Fprintf(os.Stderr, "LoadConfiguration: Error: Could not open %q for reading: %s\n", filename, err)
		os.Exit(1)
	}

	contents, err := ioutil.ReadAll(fd)
	if err != nil {
		fmt.Fprintf(os.Stderr, "LoadConfiguration: Error: Could not read %q: %s\n", filename, err)
		os.Exit(1)
	}

	xc := new(xmlLoggerConfig)
	if err := xml.Unmarshal(contents, xc); err != nil {
		fmt.Fprintf(os.Stderr, "LoadConfiguration: Error: Could not parse XML configuration in %q: %s\n", filename, err)
		os.Exit(1)
	}

	for _, xmlfilt := range xc.Filter {
		var filt LogWriter
		var lvl level
		bad, good, enabled := false, true, false

		// Check required children
		if len(xmlfilt.Enabled) == 0 {
			fmt.Fprintf(os.Stderr, "LoadConfiguration: Error: Required attribute %s for filter missing in %s\n", "enabled", filename)
			bad = true
		} else {
			enabled = xmlfilt.Enabled != "false"
		}
		if len(xmlfilt.Tag) == 0 {
			fmt.Fprintf(os.Stderr, "LoadConfiguration: Error: Required child <%s> for filter missing in %s\n", "tag", filename)
			bad = true
		}
		if len(xmlfilt.Type) == 0 {
			fmt.Fprintf(os.Stderr, "LoadConfiguration: Error: Required child <%s> for filter missing in %s\n", "type", filename)
			bad = true
		}
		if len(xmlfilt.Level) == 0 {
			fmt.Fprintf(os.Stderr, "LoadConfiguration: Error: Required child <%s> for filter missing in %s\n", "level", filename)
			bad = true
		}

		switch xmlfilt.Level {
		case "FINEST":
			lvl = FINEST
		case "FINE":
			lvl = FINE
		case "DEBUG":
			lvl = DEBUG
		case "TRACE":
			lvl = TRACE
		case "INFO":
			lvl = INFO
		case "WARNING":
			lvl = WARNING
		case "ERROR":
			lvl = ERROR
		case "CRITICAL":
			lvl = CRITICAL
		default:
			fmt.Fprintf(os.Stderr, "LoadConfiguration: Error: Required child <%s> for filter has unknown value in %s: %s\n", "level", filename, xmlfilt.Level)
			bad = true
		}

		// Just so all of the required attributes are errored at the same time if missing
		if bad {
			os.Exit(1)
		}

		switch xmlfilt.Type {
		case "console":
			filt, good = xmlToConsoleLogWriter(filename, xmlfilt.Property, enabled)
		case "file":
			filt, good = xmlToFileLogWriter(filename, xmlfilt.Property, enabled)
		case "xml":
			filt, good = xmlToXMLLogWriter(filename, xmlfilt.Property, enabled)
		case "socket":
			filt, good = xmlToSocketLogWriter(filename, xmlfilt.Property, enabled)
		default:
			fmt.Fprintf(os.Stderr, "LoadConfiguration: Error: Could not load XML configuration in %s: unknown filter type \"%s\"\n", filename, xmlfilt.Type)
			os.Exit(1)
		}

		// Just so all of the required params are errored at the same time if wrong
		if !good {
			os.Exit(1)
		}

		// If we're disabled (syntax and correctness checks only), don't add to logger
		if !enabled {
			continue
		}

		log[xmlfilt.Tag] = &Filter{lvl, filt}
	}
}

func xmlToConsoleLogWriter(filename string, props []xmlProperty, enabled bool) (ConsoleLogWriter, bool) {
	// Parse properties
	for _, prop := range props {
		switch prop.Name {
		default:
			fmt.Fprintf(os.Stderr, "LoadConfiguration: Warning: Unknown property \"%s\" for console filter in %s\n", prop.Name, filename)
		}
	}

	// If it's disabled, we're just checking syntax
	if !enabled {
		return nil, true
	}

	return NewConsoleLogWriter(), true
}

// Parse a number with K/M/G suffixes based on thousands (1000) or 2^10 (1024)
func strToNumSuffix(str string, mult int) int {
	num := 1
	if len(str) > 1 {
		switch str[len(str)-1] {
		case 'G', 'g':
			num *= mult
			fallthrough
		case 'M', 'm':
			num *= mult
			fallthrough
		case 'K', 'k':
			num *= mult
			str = str[0 : len(str)-1]
		}
	}
	parsed, _ := strconv.Atoi(str)
	return parsed * num
}
func xmlToFileLogWriter(filename string, props []xmlProperty, enabled bool) (*FileLogWriter, bool) {
	file := ""
	format := "[%D %T] [%L] (%S) %M"
	maxlines := 0
	maxsize := 0
	daily := false
	rotate := false

	// Parse properties
	for _, prop := range props {
		switch prop.Name {
		case "filename":
			file = strings.Trim(prop.Value, " \r\n")
		case "format":
			format = strings.Trim(prop.Value, " \r\n")
		case "maxlines":
			maxlines = strToNumSuffix(strings.Trim(prop.Value, " \r\n"), 1000)
		case "maxsize":
			maxsize = strToNumSuffix(strings.Trim(prop.Value, " \r\n"), 1024)
		case "daily":
			daily = strings.Trim(prop.Value, " \r\n") != "false"
		case "rotate":
			rotate = strings.Trim(prop.Value, " \r\n") != "false"
		default:
			fmt.Fprintf(os.Stderr, "LoadConfiguration: Warning: Unknown property \"%s\" for file filter in %s\n", prop.Name, filename)
		}
	}

	// Check properties
	if len(file) == 0 {
		fmt.Fprintf(os.Stderr, "LoadConfiguration: Error: Required property \"%s\" for file filter missing in %s\n", "filename", filename)
		return nil, false
	}

	// If it's disabled, we're just checking syntax
	if !enabled {
		return nil, true
	}

	flw := NewFileLogWriter(file, rotate)
	flw.SetFormat(format)
	flw.SetRotateLines(maxlines)
	flw.SetRotateSize(maxsize)
	flw.SetRotateDaily(daily)
	return flw, true
}

func xmlToXMLLogWriter(filename string, props []xmlProperty, enabled bool) (*FileLogWriter, bool) {
	file := ""
	maxrecords := 0
	maxsize := 0
	daily := false
	rotate := false

	// Parse properties
	for _, prop := range props {
		switch prop.Name {
		case "filename":
			file = strings.Trim(prop.Value, " \r\n")
		case "maxrecords":
			maxrecords = strToNumSuffix(strings.Trim(prop.Value, " \r\n"), 1000)
		case "maxsize":
			maxsize = strToNumSuffix(strings.Trim(prop.Value, " \r\n"), 1024)
		case "daily":
			daily = strings.Trim(prop.Value, " \r\n") != "false"
		case "rotate":
			rotate = strings.Trim(prop.Value, " \r\n") != "false"
		default:
			fmt.Fprintf(os.Stderr, "LoadConfiguration: Warning: Unknown property \"%s\" for xml filter in %s\n", prop.Name, filename)
		}
	}

	// Check properties
	if len(file) == 0 {
		fmt.Fprintf(os.Stderr, "LoadConfiguration: Error: Required property \"%s\" for xml filter missing in %s\n", "filename", filename)
		return nil, false
	}

	// If it's disabled, we're just checking syntax
	if !enabled {
		return nil, true
	}

	xlw := NewXMLLogWriter(file, rotate)
	xlw.SetRotateLines(maxrecords)
	xlw.SetRotateSize(maxsize)
	xlw.SetRotateDaily(daily)
	return xlw, true
}

func xmlToSocketLogWriter(filename string, props []xmlProperty, enabled bool) (SocketLogWriter, bool) {
	endpoint := ""
	protocol := "udp"

	// Parse properties
	for _, prop := range props {
		switch prop.Name {
		case "endpoint":
			endpoint = strings.Trim(prop.Value, " \r\n")
		case "protocol":
			protocol = strings.Trim(prop.Value, " \r\n")
		default:
			fmt.Fprintf(os.Stderr, "LoadConfiguration: Warning: Unknown property \"%s\" for file filter in %s\n", prop.Name, filename)
		}
	}

	// Check properties
	if len(endpoint) == 0 {
		fmt.Fprintf(os.Stderr, "LoadConfiguration: Error: Required property \"%s\" for file filter missing in %s\n", "endpoint", filename)
		return nil, false
	}

	// If it's disabled, we're just checking syntax
	if !enabled {
		return nil, true
	}

	return NewSocketLogWriter(protocol, endpoint), true
}