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Merge pull request #23 from ibuildthecloud/sub
Subscribe to Rancher events for reload
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FROM ubuntu:16.04 | ||
RUN apt-get update && \ | ||
apt-get install -y iptables iproute2 | ||
COPY metadata rancher-metadata router /usr/bin/ | ||
CMD ["rancher-metadata"] |
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#!/bin/bash | ||
set -e | ||
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ip addr show dev eth0 | grep 'inet ' | awk '{print $2}' | cut -f1 -d/ > /var/tmp/ip | ||
exec rancher-metadata -subscribe |
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#!/bin/bash | ||
set -e | ||
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trap "exit 0" SIGTERM SIGINT | ||
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STATE=/var/tmp/ip | ||
IP= | ||
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while true; do | ||
if [ -e $STATE ]; then | ||
NEW_IP=$(<$STATE) | ||
if [ "$NEW_IP" != "$IP" ]; then | ||
iptables -w -t nat -N CATTLE_METADATA || true | ||
iptables -w -t nat -F CATTLE_METADATA | ||
iptables -w -t nat -A CATTLE_METADATA -p tcp -d 169.254.169.250 --dport 80 -j DNAT --to ${NEW_IP}:80 | ||
for i in PREROUTING OUTPUT; do | ||
iptables -w -t nat -D $i -j CATTLE_METADATA || true | ||
iptables -w -t nat -I $i -j CATTLE_METADATA | ||
done | ||
IP=${NEW_IP} | ||
echo Forwarding traffic to $IP | ||
fi | ||
else | ||
echo Waiting for $STATE | ||
fi | ||
sleep 2 | ||
done |
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Original file line number | Diff line number | Diff line change |
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package main | ||
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import ( | ||
"io" | ||
"net/http" | ||
"os" | ||
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"github.com/Sirupsen/logrus" | ||
"github.com/mitchellh/mapstructure" | ||
revents "github.com/rancher/event-subscriber/events" | ||
"github.com/rancher/go-rancher/v2" | ||
) | ||
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type ReloadFunc func(file string) (Versions, error) | ||
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type Subscriber struct { | ||
url string | ||
accessKey string | ||
secretKey string | ||
reload ReloadFunc | ||
answerFile string | ||
client *http.Client | ||
} | ||
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func NewSubscriber(url, accessKey, secretKey, answerFile string, reload ReloadFunc) *Subscriber { | ||
return &Subscriber{ | ||
url: url, | ||
accessKey: accessKey, | ||
secretKey: secretKey, | ||
reload: reload, | ||
answerFile: answerFile, | ||
client: &http.Client{}, | ||
} | ||
} | ||
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func (s *Subscriber) Subscribe() error { | ||
handlers := map[string]revents.EventHandler{ | ||
"ping": s.noOp, | ||
"config.update": s.configUpdate, | ||
} | ||
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router, err := revents.NewEventRouter("", 0, s.url, s.accessKey, s.secretKey, nil, handlers, "", 3, revents.DefaultPingConfig) | ||
if err != nil { | ||
return err | ||
} | ||
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go func() { | ||
logrus.Fatalf("Exiting subscriber: %v", router.StartWithoutCreate(nil)) | ||
}() | ||
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return nil | ||
} | ||
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func (s *Subscriber) noOp(event *revents.Event, c *client.RancherClient) error { | ||
return nil | ||
} | ||
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func (s *Subscriber) configUpdate(event *revents.Event, c *client.RancherClient) error { | ||
update := ConfigUpdateData{} | ||
if err := mapstructure.Decode(event.Data, &update); err != nil { | ||
return err | ||
} | ||
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found := false | ||
for _, item := range update.Items { | ||
if found = item.Name == "metadata-answers"; found { | ||
if err := s.downloadAndReload(); err != nil { | ||
return err | ||
} | ||
break | ||
} | ||
} | ||
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_, err := c.Publish.Create(&client.Publish{ | ||
Name: event.ReplyTo, | ||
PreviousIds: []string{event.ID}, | ||
}) | ||
return err | ||
} | ||
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func (s *Subscriber) downloadAndReload() error { | ||
url := s.url + "/configcontent/metadata-answers" | ||
req, err := http.NewRequest("GET", url, nil) | ||
if err != nil { | ||
return err | ||
} | ||
req.SetBasicAuth(s.accessKey, s.secretKey) | ||
resp, err := s.client.Do(req) | ||
if err != nil { | ||
return err | ||
} | ||
defer resp.Body.Close() | ||
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tempFile := s.answerFile + ".temp" | ||
out, err := os.Create(tempFile) | ||
if err != nil { | ||
return err | ||
} | ||
defer func() { | ||
out.Close() | ||
os.Remove(tempFile) | ||
}() | ||
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_, err = io.Copy(out, resp.Body) | ||
if err != nil { | ||
return err | ||
} | ||
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versions, err := s.reload(tempFile) | ||
if err != nil { | ||
return err | ||
} | ||
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os.Rename(tempFile, s.answerFile) | ||
def, ok := versions["latest"]["default"].(map[string]interface{}) | ||
if ok { | ||
version, _ := def["version"].(string) | ||
logrus.Infof("Applied %s", url+"?version="+version) | ||
req, err := http.NewRequest("PUT", url+"?version="+version, nil) | ||
if err != nil { | ||
return err | ||
} | ||
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req.SetBasicAuth(s.accessKey, s.secretKey) | ||
resp, err := s.client.Do(req) | ||
if err != nil { | ||
return err | ||
} | ||
if resp.Body != nil { | ||
resp.Body.Close() | ||
} | ||
} | ||
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return err | ||
} | ||
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type ConfigUpdateData struct { | ||
ConfigUrl string | ||
Items []ConfigUpdateItem | ||
} | ||
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type ConfigUpdateItem struct { | ||
Name string | ||
} |
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