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bootstrap from example
Signed-off-by: Adphi <philippe.adrien.nousse@gmail.com>
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LICENSE
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LICENSE
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Apache License
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APPENDIX: How to apply the Apache License to your work.
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80
README.md
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80
README.md
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|||||||
|
# example
|
||||||
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||||||
|
## Name
|
||||||
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|
||||||
|
*example* - prints "example" after a query is handled.
|
||||||
|
|
||||||
|
## Description
|
||||||
|
|
||||||
|
The example plugin prints "example" on every query that got handled by the server. It serves as
|
||||||
|
documentation for writing CoreDNS plugins.
|
||||||
|
|
||||||
|
## Compilation
|
||||||
|
|
||||||
|
This package will always be compiled as part of CoreDNS and not in a standalone way. It will require you to use `go get` or as a dependency on [plugin.cfg](https://github.com/coredns/coredns/blob/master/plugin.cfg).
|
||||||
|
|
||||||
|
The [manual](https://coredns.io/manual/toc/#what-is-coredns) will have more information about how to configure and extend the server with external plugins.
|
||||||
|
|
||||||
|
A simple way to consume this plugin, is by adding the following on [plugin.cfg](https://github.com/coredns/coredns/blob/master/plugin.cfg), and recompile it as [detailed on coredns.io](https://coredns.io/2017/07/25/compile-time-enabling-or-disabling-plugins/#build-with-compile-time-configuration-file).
|
||||||
|
|
||||||
|
~~~
|
||||||
|
example:github.com/coredns/example
|
||||||
|
~~~
|
||||||
|
|
||||||
|
Put this early in the plugin list, so that *example* is executed before any of the other plugins.
|
||||||
|
|
||||||
|
After this you can compile coredns by:
|
||||||
|
|
||||||
|
``` sh
|
||||||
|
go generate
|
||||||
|
go build
|
||||||
|
```
|
||||||
|
|
||||||
|
Or you can instead use make:
|
||||||
|
|
||||||
|
``` sh
|
||||||
|
make
|
||||||
|
```
|
||||||
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|
||||||
|
## Syntax
|
||||||
|
|
||||||
|
~~~ txt
|
||||||
|
example
|
||||||
|
~~~
|
||||||
|
|
||||||
|
## Metrics
|
||||||
|
|
||||||
|
If monitoring is enabled (via the *prometheus* directive) the following metric is exported:
|
||||||
|
|
||||||
|
* `coredns_example_request_count_total{server}` - query count to the *example* plugin.
|
||||||
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|
||||||
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The `server` label indicated which server handled the request, see the *metrics* plugin for details.
|
||||||
|
|
||||||
|
## Ready
|
||||||
|
|
||||||
|
This plugin reports readiness to the ready plugin. It will be immediately ready.
|
||||||
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|
||||||
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## Examples
|
||||||
|
|
||||||
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In this configuration, we forward all queries to 9.9.9.9 and print "example" whenever we receive
|
||||||
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a query.
|
||||||
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|
||||||
|
~~~ corefile
|
||||||
|
. {
|
||||||
|
forward . 9.9.9.9
|
||||||
|
example
|
||||||
|
}
|
||||||
|
~~~
|
||||||
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|
||||||
|
Or without any external connectivity:
|
||||||
|
|
||||||
|
~~~ corefile
|
||||||
|
. {
|
||||||
|
whoami
|
||||||
|
example
|
||||||
|
}
|
||||||
|
~~~
|
||||||
|
|
||||||
|
## Also See
|
||||||
|
|
||||||
|
See the [manual](https://coredns.io/manual).
|
63
example.go
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example.go
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|||||||
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// Package example is a CoreDNS plugin that prints "example" to stdout on every packet received.
|
||||||
|
//
|
||||||
|
// It serves as an example CoreDNS plugin with numerous code comments.
|
||||||
|
package example
|
||||||
|
|
||||||
|
import (
|
||||||
|
"context"
|
||||||
|
|
||||||
|
"github.com/coredns/coredns/plugin"
|
||||||
|
"github.com/coredns/coredns/plugin/metrics"
|
||||||
|
clog "github.com/coredns/coredns/plugin/pkg/log"
|
||||||
|
|
||||||
|
"github.com/miekg/dns"
|
||||||
|
)
|
||||||
|
|
||||||
|
// Define log to be a logger with the plugin name in it. This way we can just use log.Info and
|
||||||
|
// friends to log.
|
||||||
|
var log = clog.NewWithPlugin("example")
|
||||||
|
|
||||||
|
// Example is an example plugin to show how to write a plugin.
|
||||||
|
type Example struct {
|
||||||
|
Next plugin.Handler
|
||||||
|
}
|
||||||
|
|
||||||
|
// ServeDNS implements the plugin.Handler interface. This method gets called when example is used
|
||||||
|
// in a Server.
|
||||||
|
func (e Example) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
|
||||||
|
// This function could be simpler. I.e. just fmt.Println("example") here, but we want to show
|
||||||
|
// a slightly more complex example as to make this more interesting.
|
||||||
|
// Here we wrap the dns.ResponseWriter in a new ResponseWriter and call the next plugin, when the
|
||||||
|
// answer comes back, it will print "example".
|
||||||
|
|
||||||
|
// Debug log that we've have seen the query. This will only be shown when the debug plugin is loaded.
|
||||||
|
log.Debug("Received response")
|
||||||
|
|
||||||
|
// Wrap.
|
||||||
|
pw := NewResponsePrinter(w)
|
||||||
|
|
||||||
|
// Export metric with the server label set to the current server handling the request.
|
||||||
|
requestCount.WithLabelValues(metrics.WithServer(ctx)).Inc()
|
||||||
|
|
||||||
|
// Call next plugin (if any).
|
||||||
|
return plugin.NextOrFailure(e.Name(), e.Next, ctx, pw, r)
|
||||||
|
}
|
||||||
|
|
||||||
|
// Name implements the Handler interface.
|
||||||
|
func (e Example) Name() string { return "example" }
|
||||||
|
|
||||||
|
// ResponsePrinter wrap a dns.ResponseWriter and will write example to standard output when WriteMsg is called.
|
||||||
|
type ResponsePrinter struct {
|
||||||
|
dns.ResponseWriter
|
||||||
|
}
|
||||||
|
|
||||||
|
// NewResponsePrinter returns ResponseWriter.
|
||||||
|
func NewResponsePrinter(w dns.ResponseWriter) *ResponsePrinter {
|
||||||
|
return &ResponsePrinter{ResponseWriter: w}
|
||||||
|
}
|
||||||
|
|
||||||
|
// WriteMsg calls the underlying ResponseWriter's WriteMsg method and prints "example" to standard output.
|
||||||
|
func (r *ResponsePrinter) WriteMsg(res *dns.Msg) error {
|
||||||
|
log.Info("example")
|
||||||
|
return r.ResponseWriter.WriteMsg(res)
|
||||||
|
}
|
37
example_test.go
Normal file
37
example_test.go
Normal file
@ -0,0 +1,37 @@
|
|||||||
|
package example
|
||||||
|
|
||||||
|
import (
|
||||||
|
"bytes"
|
||||||
|
"context"
|
||||||
|
golog "log"
|
||||||
|
"strings"
|
||||||
|
"testing"
|
||||||
|
|
||||||
|
"github.com/coredns/coredns/plugin/pkg/dnstest"
|
||||||
|
"github.com/coredns/coredns/plugin/test"
|
||||||
|
|
||||||
|
"github.com/miekg/dns"
|
||||||
|
)
|
||||||
|
|
||||||
|
func TestExample(t *testing.T) {
|
||||||
|
// Create a new Example Plugin. Use the test.ErrorHandler as the next plugin.
|
||||||
|
x := Example{Next: test.ErrorHandler()}
|
||||||
|
|
||||||
|
// Setup a new output buffer that is *not* standard output, so we can check if
|
||||||
|
// example is really being printed.
|
||||||
|
b := &bytes.Buffer{}
|
||||||
|
golog.SetOutput(b)
|
||||||
|
|
||||||
|
ctx := context.TODO()
|
||||||
|
r := new(dns.Msg)
|
||||||
|
r.SetQuestion("example.org.", dns.TypeA)
|
||||||
|
// Create a new Recorder that captures the result, this isn't actually used in this test
|
||||||
|
// as it just serves as something that implements the dns.ResponseWriter interface.
|
||||||
|
rec := dnstest.NewRecorder(&test.ResponseWriter{})
|
||||||
|
|
||||||
|
// Call our plugin directly, and check the result.
|
||||||
|
x.ServeDNS(ctx, rec, r)
|
||||||
|
if a := b.String(); !strings.Contains(a, "[INFO] plugin/example: example") {
|
||||||
|
t.Errorf("Failed to print '%s', got %s", "[INFO] plugin/example: example", a)
|
||||||
|
}
|
||||||
|
}
|
20
metrics.go
Normal file
20
metrics.go
Normal file
@ -0,0 +1,20 @@
|
|||||||
|
package example
|
||||||
|
|
||||||
|
import (
|
||||||
|
"sync"
|
||||||
|
|
||||||
|
"github.com/coredns/coredns/plugin"
|
||||||
|
|
||||||
|
"github.com/prometheus/client_golang/prometheus"
|
||||||
|
"github.com/prometheus/client_golang/prometheus/promauto"
|
||||||
|
)
|
||||||
|
|
||||||
|
// requestCount exports a prometheus metric that is incremented every time a query is seen by the example plugin.
|
||||||
|
var requestCount = promauto.NewCounterVec(prometheus.CounterOpts{
|
||||||
|
Namespace: plugin.Namespace,
|
||||||
|
Subsystem: "example",
|
||||||
|
Name: "request_count_total",
|
||||||
|
Help: "Counter of requests made.",
|
||||||
|
}, []string{"server"})
|
||||||
|
|
||||||
|
var once sync.Once
|
5
ready.go
Normal file
5
ready.go
Normal file
@ -0,0 +1,5 @@
|
|||||||
|
package example
|
||||||
|
|
||||||
|
// Ready implements the ready.Readiness interface, once this flips to true CoreDNS
|
||||||
|
// assumes this plugin is ready for queries; it is not checked again.
|
||||||
|
func (e Example) Ready() bool { return true }
|
30
setup.go
Normal file
30
setup.go
Normal file
@ -0,0 +1,30 @@
|
|||||||
|
package example
|
||||||
|
|
||||||
|
import (
|
||||||
|
"github.com/coredns/caddy"
|
||||||
|
"github.com/coredns/coredns/core/dnsserver"
|
||||||
|
"github.com/coredns/coredns/plugin"
|
||||||
|
)
|
||||||
|
|
||||||
|
// init registers this plugin.
|
||||||
|
func init() { plugin.Register("example", setup) }
|
||||||
|
|
||||||
|
// setup is the function that gets called when the config parser see the token "example". Setup is responsible
|
||||||
|
// for parsing any extra options the example plugin may have. The first token this function sees is "example".
|
||||||
|
func setup(c *caddy.Controller) error {
|
||||||
|
c.Next() // Ignore "example" and give us the next token.
|
||||||
|
if c.NextArg() {
|
||||||
|
// If there was another token, return an error, because we don't have any configuration.
|
||||||
|
// Any errors returned from this setup function should be wrapped with plugin.Error, so we
|
||||||
|
// can present a slightly nicer error message to the user.
|
||||||
|
return plugin.Error("example", c.ArgErr())
|
||||||
|
}
|
||||||
|
|
||||||
|
// Add the Plugin to CoreDNS, so Servers can use it in their plugin chain.
|
||||||
|
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
|
||||||
|
return Example{Next: next}
|
||||||
|
})
|
||||||
|
|
||||||
|
// All OK, return a nil error.
|
||||||
|
return nil
|
||||||
|
}
|
21
setup_test.go
Normal file
21
setup_test.go
Normal file
@ -0,0 +1,21 @@
|
|||||||
|
package example
|
||||||
|
|
||||||
|
import (
|
||||||
|
"testing"
|
||||||
|
|
||||||
|
"github.com/coredns/caddy"
|
||||||
|
)
|
||||||
|
|
||||||
|
// TestSetup tests the various things that should be parsed by setup.
|
||||||
|
// Make sure you also test for parse errors.
|
||||||
|
func TestSetup(t *testing.T) {
|
||||||
|
c := caddy.NewTestController("dns", `example`)
|
||||||
|
if err := setup(c); err != nil {
|
||||||
|
t.Fatalf("Expected no errors, but got: %v", err)
|
||||||
|
}
|
||||||
|
|
||||||
|
c = caddy.NewTestController("dns", `example more`)
|
||||||
|
if err := setup(c); err == nil {
|
||||||
|
t.Fatalf("Expected errors, but got: %v", err)
|
||||||
|
}
|
||||||
|
}
|
Loading…
Reference in New Issue
Block a user