forked from vmware-archive/atc
/
garden_round_tripper.go
54 lines (43 loc) · 1.23 KB
/
garden_round_tripper.go
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package transport
import "net/http"
type gardenRoundTripper struct {
db TransportDB
workerName string
innerRoundTripper http.RoundTripper
cachedHost *string
}
func NewGardenRoundTripper(workerName string, workerHost *string, db TransportDB, innerRoundTripper http.RoundTripper) http.RoundTripper {
return &gardenRoundTripper{
innerRoundTripper: innerRoundTripper,
workerName: workerName,
db: db,
cachedHost: workerHost,
}
}
func (c *gardenRoundTripper) RoundTrip(request *http.Request) (*http.Response, error) {
if c.cachedHost == nil {
savedWorker, found, err := c.db.GetWorker(c.workerName)
if err != nil {
return nil, err
}
if !found {
return nil, WorkerMissingError{WorkerName: c.workerName}
}
if savedWorker.GardenAddr() == nil {
return nil, WorkerUnreachableError{
WorkerName: c.workerName,
WorkerState: string(savedWorker.State()),
}
}
c.cachedHost = savedWorker.GardenAddr()
}
updatedURL := *request.URL
updatedURL.Host = *c.cachedHost
updatedRequest := *request
updatedRequest.URL = &updatedURL
response, err := c.innerRoundTripper.RoundTrip(&updatedRequest)
if err != nil {
c.cachedHost = nil
}
return response, err
}