Matthias Radestock
f7f0369bff
- always info-log when we encounter an 'interesting' container - s/CIDR/WEAVE_CIDR - some other minor tweaks
109 lines
2.6 KiB
Go
109 lines
2.6 KiB
Go
package proxy
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import (
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"bytes"
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"encoding/json"
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"io/ioutil"
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"net/http"
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"strings"
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"github.com/fsouza/go-dockerclient"
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. "github.com/weaveworks/weave/common"
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)
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type createContainerInterceptor struct {
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client *docker.Client
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withDNS bool
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dockerBridgeIP string
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}
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type createContainerRequestBody struct {
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*docker.Config
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HostConfig *docker.HostConfig `json:"HostConfig,omitempty" yaml:"HostConfig,omitempty"`
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MacAddress string `json:"MacAddress,omitempty" yaml:"MacAddress,omitempty"`
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}
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func (i *createContainerInterceptor) InterceptRequest(r *http.Request) error {
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body, err := ioutil.ReadAll(r.Body)
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if err != nil {
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return err
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}
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r.Body.Close()
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container := createContainerRequestBody{}
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if err := json.Unmarshal(body, &container); err != nil {
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return err
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}
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if cidrs, ok := weaveCIDRsFromConfig(container.Config); ok {
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Info.Printf("Creating container with WEAVE_CIDR \"%s\"", strings.Join(cidrs, " "))
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container.HostConfig.VolumesFrom = append(container.HostConfig.VolumesFrom, "weaveproxy")
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if err := i.setWeaveWaitEntrypoint(container.Config); err != nil {
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return err
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}
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if err := i.setWeaveDNS(&container); err != nil {
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return err
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}
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}
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newBody, err := json.Marshal(container)
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if err != nil {
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return err
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}
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r.Body = ioutil.NopCloser(bytes.NewReader(newBody))
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r.ContentLength = int64(len(newBody))
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return nil
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}
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func (i *createContainerInterceptor) setWeaveWaitEntrypoint(container *docker.Config) error {
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var image *docker.Config
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if !configHasEntrypoint(container) || !configHasCmd(container) {
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imageInfo, err := i.client.InspectImage(container.Image)
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if err != nil {
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return err
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}
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image = imageInfo.Config
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}
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var entry, command []string
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if configHasEntrypoint(container) {
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entry = container.Entrypoint
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} else if configHasEntrypoint(image) {
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entry = image.Entrypoint
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}
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if configHasCmd(container) {
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command = container.Cmd
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} else if configHasCmd(image) {
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command = image.Cmd
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}
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container.Entrypoint = weaveWaitEntrypoint
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container.Cmd = append(entry, command...)
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return nil
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}
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func configHasEntrypoint(c *docker.Config) bool {
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return c != nil && len(c.Entrypoint) > 0
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}
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func configHasCmd(c *docker.Config) bool {
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return c != nil && len(c.Cmd) > 0
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}
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func (i *createContainerInterceptor) setWeaveDNS(container *createContainerRequestBody) error {
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if !i.withDNS {
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return nil
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}
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container.HostConfig.DNS = append(container.HostConfig.DNS, i.dockerBridgeIP)
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if len(container.HostConfig.DNSSearch) == 0 {
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container.HostConfig.DNSSearch = []string{"."}
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}
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return nil
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}
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func (i *createContainerInterceptor) InterceptResponse(r *http.Response) error {
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return nil
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}
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