bde450fef97dc74911e4aa516b859a3dba85afe7
1 //
2 // Copyright (C) 2014 Sebastian 'tokkee' Harl <sh@tokkee.org>
3 // All rights reserved.
4 //
5 // Redistribution and use in source and binary forms, with or without
6 // modification, are permitted provided that the following conditions
7 // are met:
8 // 1. Redistributions of source code must retain the above copyright
9 // notice, this list of conditions and the following disclaimer.
10 // 2. Redistributions in binary form must reproduce the above copyright
11 // notice, this list of conditions and the following disclaimer in the
12 // documentation and/or other materials provided with the distribution.
13 //
14 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
15 // ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
16 // TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
17 // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
18 // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
21 // OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
22 // WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
23 // OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
24 // ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 package server
28 // Helper functions for handling queries.
30 import (
31 "errors"
32 "fmt"
33 "strings"
34 "time"
35 "unicode"
37 "github.com/sysdb/go/client"
38 "github.com/sysdb/go/proto"
39 )
41 func listAll(req request, s *Server) (*page, error) {
42 if len(req.args) != 0 {
43 return nil, fmt.Errorf("%s not found", strings.Title(req.cmd))
44 }
46 q, err := client.QueryString("LIST %s", client.Identifier(req.cmd))
47 if err != nil {
48 return nil, err
49 }
50 res, err := s.c.Query(q)
51 if err != nil {
52 return nil, err
53 }
54 // the template *must* exist
55 return tmpl(s.results[req.cmd], res)
56 }
58 func lookup(req request, s *Server) (*page, error) {
59 if req.r.Method != "POST" {
60 return nil, errors.New("Method not allowed")
61 }
62 raw, err := parseQuery(req.r.PostForm.Get("query"))
63 if err != nil {
64 return nil, err
65 }
67 if raw.typ == "" {
68 raw.typ = "hosts"
69 }
70 var args string
71 for name, value := range raw.args {
72 if len(args) > 0 {
73 args += " AND"
74 }
76 if name == "name" {
77 args += fmt.Sprintf(" name =~ %s", value)
78 } else {
79 args += fmt.Sprintf(" %s = %s", name, value)
80 }
81 }
83 q, err := client.QueryString("LOOKUP %s MATCHING"+args, client.Identifier(raw.typ))
84 if err != nil {
85 return nil, err
86 }
87 res, err := s.c.Query(q)
88 if err != nil {
89 return nil, err
90 }
91 if t, ok := s.results[raw.typ]; ok {
92 return tmpl(t, res)
93 }
94 return nil, fmt.Errorf("Unsupported type %s", raw.typ)
95 }
97 func fetch(req request, s *Server) (*page, error) {
98 if len(req.args) == 0 {
99 return nil, fmt.Errorf("%s not found", strings.Title(req.cmd))
100 }
102 var q string
103 var err error
104 switch req.cmd {
105 case "host":
106 if len(req.args) != 1 {
107 return nil, fmt.Errorf("%s not found", strings.Title(req.cmd))
108 }
109 q, err = client.QueryString("FETCH host %s", req.args[0])
110 case "service", "metric":
111 if len(req.args) != 2 {
112 return nil, fmt.Errorf("%s not found", strings.Title(req.cmd))
113 }
114 q, err = client.QueryString("FETCH %s %s.%s", client.Identifier(req.cmd), req.args[0], req.args[1])
115 default:
116 panic("Unknown request: fetch(" + req.cmd + ")")
117 }
118 if err != nil {
119 return nil, err
120 }
122 res, err := s.c.Query(q)
123 if err != nil {
124 return nil, err
125 }
126 if req.cmd == "metric" {
127 return metric(req, res, s)
128 }
129 return tmpl(s.results[req.cmd], res)
130 }
132 func graphs(req request, s *Server) (*page, error) {
133 p := struct {
134 Query, Metrics string
135 }{
136 Query: req.r.PostForm.Get("metrics-query"),
137 }
139 if req.r.Method == "POST" {
140 p.Metrics = p.Query
141 }
142 return tmpl(s.results["graphs"], &p)
143 }
145 var datetime = "2006-01-02 15:04:05"
147 func metric(req request, res interface{}, s *Server) (*page, error) {
148 start := time.Now().Add(-24 * time.Hour)
149 end := time.Now()
150 if req.r.Method == "POST" {
151 var err error
152 // Parse the values first to verify their format.
153 if s := req.r.PostForm.Get("start_date"); s != "" {
154 if start, err = time.Parse(datetime, s); err != nil {
155 return nil, fmt.Errorf("Invalid start time %q", s)
156 }
157 }
158 if e := req.r.PostForm.Get("end_date"); e != "" {
159 if end, err = time.Parse(datetime, e); err != nil {
160 return nil, fmt.Errorf("Invalid end time %q", e)
161 }
162 }
163 }
165 p := struct {
166 StartTime string
167 EndTime string
168 URLStart string
169 URLEnd string
170 Data interface{}
171 }{
172 start.Format(datetime),
173 end.Format(datetime),
174 start.Format(urldate),
175 end.Format(urldate),
176 res,
177 }
178 return tmpl(s.results["metric"], &p)
179 }
181 type query struct {
182 typ string
183 args map[string]string
184 }
186 func (q *query) arg(name, value string) error {
187 if _, ok := q.args[name]; ok {
188 return fmt.Errorf("Duplicate key %q", name)
189 }
190 q.args[name] = proto.EscapeString(value)
191 return nil
192 }
194 func (q *query) attr(parent, name, value string) error {
195 var k string
196 if parent != "" {
197 k = fmt.Sprintf("%s.attribute[%s]", parent, proto.EscapeString(name))
198 } else {
199 k = fmt.Sprintf("attribute[%s]", proto.EscapeString(name))
200 }
202 return q.arg(k, value)
203 }
205 func parseQuery(s string) (*query, error) {
206 tokens, err := tokenize(s)
207 if err != nil {
208 return nil, err
209 }
210 if len(tokens) == 0 {
211 return nil, errors.New("Empty query")
212 }
214 q := &query{args: make(map[string]string)}
215 for i, tok := range tokens {
216 if fields := strings.SplitN(tok, ":", 2); len(fields) == 2 {
217 // Query: [<type>:] [<sibling-type>.]<attribute>:<value> ...
218 if i == 0 && fields[1] == "" {
219 q.typ = fields[0]
220 } else if elems := strings.Split(fields[0], "."); len(elems) > 1 {
221 objs := elems[:len(elems)-1]
222 for _, o := range objs {
223 if o != "host" && o != "service" && o != "metric" {
224 return nil, fmt.Errorf("Invalid object type %q", o)
225 }
226 }
227 if err := q.attr(strings.Join(objs, "."), elems[len(elems)-1], fields[1]); err != nil {
228 return nil, err
229 }
230 } else {
231 if err := q.attr("", fields[0], fields[1]); err != nil {
232 return nil, err
233 }
234 }
235 } else {
236 if err := q.arg("name", tok); err != nil {
237 return nil, err
238 }
239 }
240 }
241 return q, nil
242 }
244 // tokenize split the string s into its tokens where a token is either a quoted
245 // string or surrounded by one or more consecutive whitespace characters.
246 func tokenize(s string) ([]string, error) {
247 scan := scanner{}
248 tokens := []string{}
249 start := -1
250 for i, r := range s {
251 if !scan.inField(r) {
252 if start == -1 {
253 // Skip leading and consecutive whitespace.
254 continue
255 }
256 tok, err := unescape(s[start:i])
257 if err != nil {
258 return nil, err
259 }
260 tokens = append(tokens, tok)
261 start = -1
262 } else if start == -1 {
263 // Found a new field.
264 start = i
265 }
266 }
267 if start >= 0 {
268 // Last (or possibly only) field.
269 tok, err := unescape(s[start:])
270 if err != nil {
271 return nil, err
272 }
273 tokens = append(tokens, tok)
274 }
276 if scan.inQuotes {
277 return nil, errors.New("quoted string not terminated")
278 }
279 if scan.escaped {
280 return nil, errors.New("illegal character escape at end of string")
281 }
282 return tokens, nil
283 }
285 func unescape(s string) (string, error) {
286 var unescaped []byte
287 var i, n int
288 for i = 0; i < len(s); i++ {
289 if s[i] != '\\' {
290 n++
291 continue
292 }
294 if i >= len(s) {
295 return "", errors.New("illegal character escape at end of string")
296 }
297 if s[i+1] != ' ' && s[i+1] != '"' && s[i+1] != '\\' {
298 // Allow simple escapes only for now.
299 return "", fmt.Errorf("illegal character escape \\%c", s[i+1])
300 }
301 if unescaped == nil {
302 unescaped = []byte(s)
303 }
304 copy(unescaped[n:], s[i+1:])
305 }
307 if unescaped != nil {
308 return string(unescaped[:n]), nil
309 }
310 return s, nil
311 }
313 type scanner struct {
314 inQuotes bool
315 escaped bool
316 }
318 func (s *scanner) inField(r rune) bool {
319 if s.escaped {
320 s.escaped = false
321 return true
322 }
323 if r == '\\' {
324 s.escaped = true
325 return true
326 }
327 if s.inQuotes {
328 if r == '"' {
329 s.inQuotes = false
330 return false
331 }
332 return true
333 }
334 if r == '"' {
335 s.inQuotes = true
336 return false
337 }
338 return !unicode.IsSpace(r)
339 }
341 // vim: set tw=78 sw=4 sw=4 noexpandtab :