├── go.mod ├── .travis.yml ├── README.md ├── metrics.go ├── setup_test.go ├── handler_test.go ├── handler.go ├── setup.go ├── LICENSE └── go.sum /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/miekg/caddy-prometheus 2 | 3 | go 1.12 4 | 5 | require ( 6 | github.com/caddyserver/caddy v1.0.1 7 | github.com/prometheus/client_golang v1.0.0 8 | ) 9 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: go 2 | 3 | env: 4 | - GO111MODULE=on 5 | 6 | go: 7 | - 1.12 8 | 9 | git: 10 | depth: 3 11 | 12 | os: 13 | - linux 14 | - osx 15 | 16 | install: 17 | - go get -d -t -v ./... 18 | - go build -v ./... 19 | - go test -race -v ./... 20 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Metrics 2 | 3 | This module enables prometheus metrics for Caddy. 4 | 5 | ## Use 6 | 7 | In your `Caddyfile`: 8 | 9 | ~~~ 10 | prometheus 11 | ~~~ 12 | 13 | For each virtual host that you want to see metrics for. 14 | 15 | These are the (optional) parameters that can be used: 16 | 17 | - **use_caddy_addr** - causes metrics to be exposed at the same address:port as Caddy itself. This can not be specified at the same time as **address**. 18 | - **address** - the address where the metrics are exposed, the default is `localhost:9180` 19 | - **path** - the path to serve collected metrics from, the default is `/metrics` 20 | - **hostname** - the `host` parameter that can be found in the exported metrics, this defaults to the label specified for the server block 21 | - **label** - Custom label to add on all metrics. 22 | This directive can be used multiple times. 23 | You should specify a label name and a value. 24 | The value is a [placeholder](https://caddyserver.com/docs/placeholders) and can be used to extract value from response header for instance. 25 | Usage: `label route_name { %v, want %v", tc.addr, res, tc.isIPv6) 136 | } 137 | } 138 | } 139 | 140 | type testHandler struct{} 141 | 142 | func (h testHandler) ServeHTTP(_ http.ResponseWriter, r *http.Request) (int, error) { 143 | var ( 144 | status int 145 | err error 146 | ) 147 | 148 | switch r.URL.Path { 149 | case "/success": 150 | status = 200 151 | case "/error": 152 | status = 500 153 | case "/proxyerror": 154 | status = 502 155 | err = errors.New("no hosts available upstream") 156 | } 157 | 158 | return status, err 159 | } 160 | -------------------------------------------------------------------------------- /handler.go: -------------------------------------------------------------------------------- 1 | package metrics 2 | 3 | import ( 4 | "net" 5 | "net/http" 6 | "strconv" 7 | "strings" 8 | "time" 9 | 10 | "github.com/caddyserver/caddy/caddyhttp/httpserver" 11 | ) 12 | 13 | func (m *Metrics) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) { 14 | next := m.next 15 | 16 | hostname := m.hostname 17 | 18 | if hostname == "" { 19 | originalHostname, err := host(r) 20 | if err != nil { 21 | hostname = "-" 22 | } else { 23 | hostname = originalHostname 24 | } 25 | } 26 | start := time.Now() 27 | 28 | // Record response to get status code and size of the reply. 29 | rw := httpserver.NewResponseRecorder(w) 30 | // Get time to first write. 31 | tw := &timedResponseWriter{ResponseWriter: rw} 32 | 33 | status, err := next.ServeHTTP(tw, r) 34 | 35 | // If nothing was explicitly written, consider the request written to 36 | // now that it has completed. 37 | tw.didWrite() 38 | 39 | // Transparently capture the status code so as to not side effect other plugins 40 | stat := status 41 | if err != nil && status == 0 { 42 | // Some middlewares set the status to 0, but return an non nil error: map these to status 500 43 | stat = 500 44 | } else if status == 0 { 45 | // 'proxy' returns a status code of 0, but the actual status is available on rw. 46 | // Note that if 'proxy' encounters an error, it returns the appropriate status code (such as 502) 47 | // from ServeHTTP and is captured above with 'stat := status'. 48 | stat = rw.Status() 49 | } 50 | 51 | fam := "1" 52 | if isIPv6(r.RemoteAddr) { 53 | fam = "2" 54 | } 55 | 56 | proto := strconv.Itoa(r.ProtoMajor) 57 | proto = proto + "." + strconv.Itoa(r.ProtoMinor) 58 | 59 | statusStr := strconv.Itoa(stat) 60 | 61 | replacer := httpserver.NewReplacer(r, rw, "") 62 | var extraLabelValues []string 63 | 64 | for _, label := range m.extraLabels { 65 | extraLabelValues = append(extraLabelValues, replacer.Replace(label.value)) 66 | } 67 | 68 | requestCount.WithLabelValues(append([]string{hostname, fam, proto}, extraLabelValues...)...).Inc() 69 | requestDuration.WithLabelValues(append([]string{hostname, fam, proto}, extraLabelValues...)...).Observe(time.Since(start).Seconds()) 70 | responseSize.WithLabelValues(append([]string{hostname, fam, proto, statusStr}, extraLabelValues...)...).Observe(float64(rw.Size())) 71 | responseStatus.WithLabelValues(append([]string{hostname, fam, proto, statusStr}, extraLabelValues...)...).Inc() 72 | responseLatency.WithLabelValues(append([]string{hostname, fam, proto, statusStr}, extraLabelValues...)...).Observe(tw.firstWrite.Sub(start).Seconds()) 73 | 74 | return status, err 75 | } 76 | 77 | func host(r *http.Request) (string, error) { 78 | host, _, err := net.SplitHostPort(r.Host) 79 | if err != nil { 80 | if !strings.Contains(r.Host, ":") { 81 | return strings.ToLower(r.Host), nil 82 | } 83 | return "", err 84 | } 85 | return strings.ToLower(host), nil 86 | } 87 | 88 | func isIPv6(addr string) bool { 89 | if host, _, err := net.SplitHostPort(addr); err == nil { 90 | // Strip away the port. 91 | addr = host 92 | } 93 | ip := net.ParseIP(addr) 94 | return ip != nil && ip.To4() == nil 95 | } 96 | 97 | // A timedResponseWriter tracks the time when the first response write 98 | // happened. 99 | type timedResponseWriter struct { 100 | firstWrite time.Time 101 | http.ResponseWriter 102 | } 103 | 104 | func (w *timedResponseWriter) didWrite() { 105 | if w.firstWrite.IsZero() { 106 | w.firstWrite = time.Now() 107 | } 108 | } 109 | 110 | func (w *timedResponseWriter) Write(data []byte) (int, error) { 111 | w.didWrite() 112 | return w.ResponseWriter.Write(data) 113 | } 114 | 115 | func (w *timedResponseWriter) WriteHeader(statuscode int) { 116 | // We consider this a write as it's valid to respond to a request by 117 | // just setting a status code and returning. 118 | w.didWrite() 119 | w.ResponseWriter.WriteHeader(statuscode) 120 | } 121 | -------------------------------------------------------------------------------- /setup.go: -------------------------------------------------------------------------------- 1 | package metrics 2 | 3 | import ( 4 | "log" 5 | "net/http" 6 | "os" 7 | "strconv" 8 | "strings" 9 | "sync" 10 | 11 | "github.com/caddyserver/caddy" 12 | "github.com/caddyserver/caddy/caddyhttp/httpserver" 13 | "github.com/prometheus/client_golang/prometheus" 14 | "github.com/prometheus/client_golang/prometheus/promhttp" 15 | ) 16 | 17 | func init() { 18 | caddy.RegisterPlugin("prometheus", caddy.Plugin{ 19 | ServerType: "http", 20 | Action: setup, 21 | }) 22 | } 23 | 24 | const ( 25 | defaultPath = "/metrics" 26 | defaultAddr = "localhost:9180" 27 | ) 28 | 29 | var once sync.Once 30 | 31 | // Metrics holds the prometheus configuration. 32 | type Metrics struct { 33 | next httpserver.Handler 34 | addr string // where to we listen 35 | useCaddyAddr bool 36 | hostname string 37 | path string 38 | extraLabels []extraLabel 39 | latencyBuckets []float64 40 | sizeBuckets []float64 41 | // subsystem? 42 | once sync.Once 43 | 44 | handler http.Handler 45 | } 46 | 47 | type extraLabel struct { 48 | name string 49 | value string 50 | } 51 | 52 | // NewMetrics - 53 | func NewMetrics() *Metrics { 54 | return &Metrics{ 55 | path: defaultPath, 56 | addr: defaultAddr, 57 | extraLabels: []extraLabel{}, 58 | } 59 | } 60 | 61 | func (m *Metrics) start() error { 62 | m.once.Do(func() { 63 | m.define("") 64 | 65 | prometheus.MustRegister(requestCount) 66 | prometheus.MustRegister(requestDuration) 67 | prometheus.MustRegister(responseLatency) 68 | prometheus.MustRegister(responseSize) 69 | prometheus.MustRegister(responseStatus) 70 | 71 | if !m.useCaddyAddr { 72 | http.Handle(m.path, m.handler) 73 | go func() { 74 | err := http.ListenAndServe(m.addr, nil) 75 | if err != nil { 76 | log.Printf("[ERROR] Starting handler: %v", err) 77 | } 78 | }() 79 | } 80 | }) 81 | return nil 82 | } 83 | 84 | func (m *Metrics) extraLabelNames() []string { 85 | names := make([]string, 0, len(m.extraLabels)) 86 | 87 | for _, label := range m.extraLabels { 88 | names = append(names, label.name) 89 | } 90 | 91 | return names 92 | } 93 | 94 | func setup(c *caddy.Controller) error { 95 | metrics, err := parse(c) 96 | if err != nil { 97 | return err 98 | } 99 | 100 | metrics.handler = promhttp.HandlerFor(prometheus.DefaultGatherer, promhttp.HandlerOpts{ 101 | ErrorHandling: promhttp.HTTPErrorOnError, 102 | ErrorLog: log.New(os.Stderr, "", log.LstdFlags), 103 | }) 104 | 105 | once.Do(func() { 106 | c.OnStartup(metrics.start) 107 | }) 108 | 109 | cfg := httpserver.GetConfig(c) 110 | if metrics.useCaddyAddr { 111 | cfg.AddMiddleware(func(next httpserver.Handler) httpserver.Handler { 112 | return httpserver.HandlerFunc(func(w http.ResponseWriter, r *http.Request) (int, error) { 113 | if r.URL.Path == metrics.path { 114 | metrics.handler.ServeHTTP(w, r) 115 | return 0, nil 116 | } 117 | return next.ServeHTTP(w, r) 118 | }) 119 | }) 120 | } 121 | cfg.AddMiddleware(func(next httpserver.Handler) httpserver.Handler { 122 | metrics.next = next 123 | return metrics 124 | }) 125 | return nil 126 | } 127 | 128 | // prometheus { 129 | // address localhost:9180 130 | // } 131 | // Or just: prometheus localhost:9180 132 | func parse(c *caddy.Controller) (*Metrics, error) { 133 | var ( 134 | metrics *Metrics 135 | err error 136 | ) 137 | 138 | for c.Next() { 139 | if metrics != nil { 140 | return nil, c.Err("prometheus: can only have one metrics module per server") 141 | } 142 | metrics = NewMetrics() 143 | args := c.RemainingArgs() 144 | 145 | switch len(args) { 146 | case 0: 147 | case 1: 148 | metrics.addr = args[0] 149 | default: 150 | return nil, c.ArgErr() 151 | } 152 | addrSet := false 153 | for c.NextBlock() { 154 | switch c.Val() { 155 | case "path": 156 | args = c.RemainingArgs() 157 | if len(args) != 1 { 158 | return nil, c.ArgErr() 159 | } 160 | metrics.path = args[0] 161 | case "address": 162 | if metrics.useCaddyAddr { 163 | return nil, c.Err("prometheus: address and use_caddy_addr options may not be used together") 164 | } 165 | args = c.RemainingArgs() 166 | if len(args) != 1 { 167 | return nil, c.ArgErr() 168 | } 169 | metrics.addr = args[0] 170 | addrSet = true 171 | case "hostname": 172 | args = c.RemainingArgs() 173 | if len(args) != 1 { 174 | return nil, c.ArgErr() 175 | } 176 | metrics.hostname = args[0] 177 | case "use_caddy_addr": 178 | if addrSet { 179 | return nil, c.Err("prometheus: address and use_caddy_addr options may not be used together") 180 | } 181 | metrics.useCaddyAddr = true 182 | case "label": 183 | args = c.RemainingArgs() 184 | if len(args) != 2 { 185 | return nil, c.ArgErr() 186 | } 187 | 188 | labelName := strings.TrimSpace(args[0]) 189 | labelValuePlaceholder := args[1] 190 | 191 | metrics.extraLabels = append(metrics.extraLabels, extraLabel{name: labelName, value: labelValuePlaceholder}) 192 | case "latency_buckets": 193 | args = c.RemainingArgs() 194 | if len(args) < 1 { 195 | return nil, c.Err("prometheus: must specify 1 or more latency buckets") 196 | } 197 | metrics.latencyBuckets = make([]float64, len(args)) 198 | for i, v := range args { 199 | b, err := strconv.ParseFloat(v, 64) 200 | if err != nil { 201 | return nil, c.Errf("prometheus: invalid bucket %q - must be a number", v) 202 | } 203 | metrics.latencyBuckets[i] = b 204 | } 205 | case "size_buckets": 206 | args = c.RemainingArgs() 207 | if len(args) < 1 { 208 | return nil, c.Err("prometheus: must specify 1 or more size buckets") 209 | } 210 | metrics.sizeBuckets = make([]float64, len(args)) 211 | for i, v := range args { 212 | b, err := strconv.ParseFloat(v, 64) 213 | if err != nil { 214 | return nil, c.Errf("prometheus: invalid bucket %q - must be a number", v) 215 | } 216 | metrics.sizeBuckets[i] = b 217 | } 218 | default: 219 | return nil, c.Errf("prometheus: unknown item: %s", c.Val()) 220 | } 221 | } 222 | } 223 | return metrics, err 224 | } 225 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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-------------------------------------------------------------------------------- 1 | github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ= 2 | github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= 3 | github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= 4 | github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0= 5 | github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q= 6 | github.com/beorn7/perks v1.0.0 h1:HWo1m869IqiPhD389kmkxeTalrjNbbJTC8LXupb+sl0= 7 | github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8= 8 | github.com/bifurcation/mint v0.0.0-20180715133206-93c51c6ce115 h1:fUjoj2bT6dG8LoEe+uNsKk8J+sLkDbQkJnB6Z1F02Bc= 9 | github.com/bifurcation/mint v0.0.0-20180715133206-93c51c6ce115/go.mod 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github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q= 97 | github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI= 98 | golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4= 99 | golang.org/x/crypto v0.0.0-20190123085648-057139ce5d2b/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4= 100 | golang.org/x/crypto v0.0.0-20190228161510-8dd112bcdc25/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= 101 | golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2 h1:VklqNMn3ovrHsnt90PveolxSbWFaJdECFbxSq0Mqo2M= 102 | golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= 103 | golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= 104 | golang.org/x/net v0.0.0-20181114220301-adae6a3d119a/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= 105 | golang.org/x/net v0.0.0-20190125091013-d26f9f9a57f3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4= 106 | golang.org/x/net v0.0.0-20190328230028-74de082e2cca h1:hyA6yiAgbUwuWqtscNvWAI7U1CtlaD1KilQ6iudt1aI= 107 | golang.org/x/net v0.0.0-20190328230028-74de082e2cca/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= 108 | golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 109 | golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 110 | golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4 h1:YUO/7uOKsKeq9UokNS62b8FYywz3ker1l1vDZRCRefw= 111 | golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 112 | golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 113 | golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 114 | golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 115 | golang.org/x/sys v0.0.0-20190124100055-b90733256f2e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 116 | golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 117 | golang.org/x/sys v0.0.0-20190228124157-a34e9553db1e h1:ZytStCyV048ZqDsWHiYDdoI2Vd4msMcrDECFxS+tL9c= 118 | golang.org/x/sys v0.0.0-20190228124157-a34e9553db1e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 119 | golang.org/x/text v0.3.0 h1:g61tztE5qeGQ89tm6NTjjM9VPIm088od1l6aSorWRWg= 120 | golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= 121 | gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw= 122 | gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM= 123 | gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0= 124 | gopkg.in/fsnotify.v1 v1.4.7 h1:xOHLXZwVvI9hhs+cLKq5+I5onOuwQLhQwiu63xxlHs4= 125 | gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys= 126 | gopkg.in/mcuadros/go-syslog.v2 v2.2.1 h1:60g8zx1BijSVSgLTzLCW9UC4/+i1Ih9jJ1DR5Tgp9vE= 127 | gopkg.in/mcuadros/go-syslog.v2 v2.2.1/go.mod h1:l5LPIyOOyIdQquNg+oU6Z3524YwrcqEm0aKH+5zpt2U= 128 | gopkg.in/natefinch/lumberjack.v2 v2.0.0 h1:1Lc07Kr7qY4U2YPouBjpCLxpiyxIVoxqXgkXLknAOE8= 129 | gopkg.in/natefinch/lumberjack.v2 v2.0.0/go.mod h1:l0ndWWf7gzL7RNwBG7wST/UCcT4T24xpD6X8LsfU/+k= 130 | gopkg.in/square/go-jose.v2 v2.2.2 h1:orlkJ3myw8CN1nVQHBFfloD+L3egixIa4FvUP6RosSA= 131 | gopkg.in/square/go-jose.v2 v2.2.2/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI= 132 | gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ= 133 | gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw= 134 | gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 135 | gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw= 136 | gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= 137 | --------------------------------------------------------------------------------