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dependencies.go
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dependencies.go
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package flux
import (
"context"
"net"
"syscall"
"time"
"github.com/influxdata/flux/codes"
"github.com/influxdata/flux/dependencies/filesystem"
"github.com/influxdata/flux/dependencies/http"
"github.com/influxdata/flux/dependencies/secret"
"github.com/influxdata/flux/dependencies/url"
"github.com/influxdata/flux/dependency"
"github.com/influxdata/flux/internal/errors"
)
var _ Dependencies = (*Deps)(nil)
type Dependency = dependency.Interface
type key int
const dependenciesKey key = iota
type Dependencies interface {
Dependency
HTTPClient() (http.Client, error)
PrivateHTTPClient() (http.Client, error)
FilesystemService() (filesystem.Service, error)
SecretService() (secret.Service, error)
URLValidator() (url.Validator, error)
}
// Deps implements Dependencies.
// Any deps which are nil will produce an explicit error.
type Deps struct {
Deps WrappedDeps
}
type WrappedDeps struct {
HTTPClient http.Client
FilesystemService filesystem.Service
SecretService secret.Service
URLValidator url.Validator
}
func (d Deps) HTTPClient() (http.Client, error) {
if d.Deps.HTTPClient != nil {
return d.Deps.HTTPClient, nil
}
return nil, errors.New(codes.Unimplemented, "http client uninitialized in dependencies")
}
func (d Deps) PrivateHTTPClient() (http.Client, error) {
c, err := d.HTTPClient()
if err != nil {
return nil, err
}
return http.NewPrivateClient(c), nil
}
func (d Deps) FilesystemService() (filesystem.Service, error) {
if d.Deps.FilesystemService != nil {
return d.Deps.FilesystemService, nil
}
return nil, errors.New(codes.Unimplemented, "filesystem service uninitialized in dependencies")
}
func (d Deps) SecretService() (secret.Service, error) {
if d.Deps.SecretService != nil {
return d.Deps.SecretService, nil
}
return nil, errors.New(codes.Unimplemented, "secret service uninitialized in dependencies")
}
func (d Deps) URLValidator() (url.Validator, error) {
if d.Deps.URLValidator != nil {
return d.Deps.URLValidator, nil
}
return nil, errors.New(codes.Unimplemented, "url validator uninitialized in dependencies")
}
func (d Deps) Inject(ctx context.Context) context.Context {
ctx = context.WithValue(ctx, dependenciesKey, d)
if d.Deps.FilesystemService != nil {
ctx = filesystem.Inject(ctx, d.Deps.FilesystemService)
}
return ctx
}
func GetDependencies(ctx context.Context) Dependencies {
deps := ctx.Value(dependenciesKey)
if deps == nil {
return NewEmptyDependencies()
}
return deps.(Dependencies)
}
// NewDefaultDependencies produces a set of dependencies.
// Not all dependencies have valid defaults and will not be set.
func NewDefaultDependencies() Deps {
validator := url.PassValidator{}
return Deps{
Deps: WrappedDeps{
HTTPClient: http.NewLimitedDefaultClient(validator),
// Default to having no filesystem, no secrets, and no url validation (always pass).
FilesystemService: nil,
SecretService: secret.EmptySecretService{},
URLValidator: validator,
},
}
}
// NewEmptyDependencies produces an empty set of dependencies.
// Accessing any dependency will result in an error.
func NewEmptyDependencies() Deps {
return Deps{}
}
// GetDialer will return a net.Dialer using the injected dependencies
// within the context.Context.
func GetDialer(ctx context.Context) (*net.Dialer, error) {
deps := GetDependencies(ctx)
url, err := deps.URLValidator()
if err != nil {
return nil, err
}
// Control is called after DNS lookup, but before the
// network connection is initiated.
control := func(network, address string, c syscall.RawConn) error {
host, _, err := net.SplitHostPort(address)
if err != nil {
return err
}
ip := net.ParseIP(host)
return url.ValidateIP(ip)
}
return &net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
Control: control,
}, nil
}