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docker_driver_discoverer.go
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docker_driver_discoverer.go
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package voldiscoverers
import (
"context"
"errors"
"fmt"
"os"
"path/filepath"
"regexp"
"runtime"
"code.cloudfoundry.org/lager"
"code.cloudfoundry.org/voldriver"
"code.cloudfoundry.org/voldriver/driverhttp"
"code.cloudfoundry.org/volman"
"code.cloudfoundry.org/volman/voldocker"
)
type dockerDriverDiscoverer struct {
logger lager.Logger
driverFactory DockerDriverFactory
driverRegistry volman.PluginRegistry
driverPaths []string
}
func NewDockerDriverDiscoverer(logger lager.Logger, driverRegistry volman.PluginRegistry, driverPaths []string) volman.Discoverer {
return &dockerDriverDiscoverer{
logger: logger,
driverFactory: NewDockerDriverFactory(),
driverRegistry: driverRegistry,
driverPaths: driverPaths,
}
}
func NewDockerDriverDiscovererWithDriverFactory(logger lager.Logger, driverRegistry volman.PluginRegistry, driverPaths []string, factory DockerDriverFactory) volman.Discoverer {
return &dockerDriverDiscoverer{
logger: logger,
driverFactory: factory,
driverRegistry: driverRegistry,
driverPaths: driverPaths,
}
}
func (r *dockerDriverDiscoverer) Discover(logger lager.Logger) (map[string]volman.Plugin, error) {
logger = logger.Session("discover")
logger.Debug("start")
logger.Info("discovering-drivers", lager.Data{"driver-paths": r.driverPaths})
defer logger.Debug("end")
endpoints := make(map[string]volman.Plugin)
for _, driverPath := range r.driverPaths {
//precedence order: sock -> spec -> json
spec_types := [3]string{"sock", "spec", "json"}
for _, spec_type := range spec_types {
matchingDriverSpecs, err := r.getMatchingDriverSpecs(logger, driverPath, spec_type)
if err != nil {
// untestable on linux, does glob work differently on windows???
return map[string]volman.Plugin{}, fmt.Errorf("Volman configured with an invalid driver path '%s', error occured list files (%s)", driverPath, err.Error())
}
if len(matchingDriverSpecs) > 0 {
logger.Debug("driver-specs", lager.Data{"drivers": matchingDriverSpecs})
var existing map[string]volman.Plugin
if r.driverRegistry != nil {
existing = r.driverRegistry.Plugins()
logger.Debug("existing-drivers", lager.Data{"len": len(existing)})
}
endpoints = r.insertIfAliveAndNotFound(logger, endpoints, driverPath, matchingDriverSpecs, existing)
}
}
}
return endpoints, nil
}
func (r *dockerDriverDiscoverer) getMatchingDriverSpecs(logger lager.Logger, path string, pattern string) ([]string, error) {
logger.Debug("binaries", lager.Data{"path": path, "pattern": pattern})
matchingDriverSpecs, err := filepath.Glob(path + string(os.PathSeparator) + "*." + pattern)
if err != nil { // untestable on linux, does glob work differently on windows???
return nil, fmt.Errorf("Volman configured with an invalid driver path '%s', error occured list files (%s)", path, err.Error())
}
return matchingDriverSpecs, nil
}
func (r *dockerDriverDiscoverer) insertIfAliveAndNotFound(logger lager.Logger, endpoints map[string]volman.Plugin, driverPath string, specs []string, existing map[string]volman.Plugin) map[string]volman.Plugin {
logger = logger.Session("insert-if-not-found")
logger.Debug("start")
defer logger.Debug("end")
var plugin volman.Plugin
var ok bool
var re *regexp.Regexp
for _, spec := range specs {
if runtime.GOOS == "windows" {
re = regexp.MustCompile(`([^\\]*\\)?([^\\]*)\.(sock|spec|json)$`)
} else {
re = regexp.MustCompile(`([^/]*/)?([^/]*)\.(sock|spec|json)$`)
}
segs2 := re.FindAllStringSubmatch(spec, 1)
if len(segs2) <= 0 {
continue
}
specName := segs2[0][2]
specFile := segs2[0][2] + "." + segs2[0][3]
logger.Debug("insert-unique-spec", lager.Data{"specname": specName})
_, ok = endpoints[specName]
if !ok {
plugin, ok = existing[specName]
if ok == true {
driverSpec, err := voldriver.ReadDriverSpec(logger, specName, driverPath, specFile)
if err != nil {
logger.Error("error-reading-driver-spec", err)
continue
}
pluginSpec := volman.PluginSpec{
Name: driverSpec.Name,
Address: driverSpec.Address,
}
if driverSpec.TLSConfig != nil {
pluginSpec.TLSConfig = &volman.TLSConfig{
InsecureSkipVerify: driverSpec.TLSConfig.InsecureSkipVerify,
CAFile: driverSpec.TLSConfig.CAFile,
CertFile: driverSpec.TLSConfig.CertFile,
KeyFile: driverSpec.TLSConfig.KeyFile,
}
}
if !plugin.Matches(logger, pluginSpec) {
logger.Info("existing-driver-mismatch", lager.Data{"specName": specName, "address": driverSpec.Address, "tls": driverSpec.TLSConfig})
plugin = nil
}
if plugin != nil {
dockerPlugin := plugin.(*voldocker.DockerDriverPlugin)
dockerDriver := dockerPlugin.DockerDriver.(voldriver.Driver)
env := driverhttp.NewHttpDriverEnv(logger, context.Background())
resp := dockerDriver.Activate(env)
if resp.Err != "" {
logger.Error("existing-driver-unreachable", errors.New(resp.Err), lager.Data{"specName": specName, "address": driverSpec.Address, "tls": driverSpec.TLSConfig})
plugin = nil
}
}
}
if plugin == nil {
logger.Info("creating-driver", lager.Data{"specName": specName, "driver-path": driverPath, "specFile": specFile})
driver, err := r.driverFactory.DockerDriver(logger, specName, driverPath, specFile)
if err != nil {
logger.Error("error-creating-driver", err)
continue
}
plugin = voldocker.NewDockerPluginWithDriver(driver)
env := driverhttp.NewHttpDriverEnv(logger, context.TODO())
resp := driver.Activate(env)
if resp.Err != "" {
logger.Info("skipping-non-responsive-driver", lager.Data{"specname": specName})
continue
} else {
driverImplementsErr := fmt.Errorf("driver-implements: %#v", resp.Implements)
if len(resp.Implements) == 0 {
logger.Error("driver-incorrect", driverImplementsErr)
continue
}
if !driverImplements("VolumeDriver", resp.Implements) {
logger.Error("driver-incorrect", driverImplementsErr)
continue
}
}
}
logger.Info("new-driver", lager.Data{"name": specName})
endpoints[specName] = plugin
}
}
return endpoints
}