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client.go
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client.go
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package httpclient
import (
"fmt"
"log"
"net/http"
"os"
"strings"
cleanhttp "github.com/hashicorp/go-cleanhttp"
"github.com/hashicorp/terraform-plugin-sdk/internal/version"
)
const uaEnvVar = "TF_APPEND_USER_AGENT"
const userAgentFormat = "Terraform/%s"
// New returns the DefaultPooledClient from the cleanhttp
// package that will also send a Terraform User-Agent string.
func New() *http.Client {
cli := cleanhttp.DefaultPooledClient()
cli.Transport = &userAgentRoundTripper{
userAgent: UserAgentString(),
inner: cli.Transport,
}
return cli
}
type userAgentRoundTripper struct {
inner http.RoundTripper
userAgent string
}
func (rt *userAgentRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
if _, ok := req.Header["User-Agent"]; !ok {
req.Header.Set("User-Agent", rt.userAgent)
}
log.Printf("[TRACE] HTTP client %s request to %s", req.Method, req.URL.String())
return rt.inner.RoundTrip(req)
}
func UserAgentString() string {
ua := fmt.Sprintf(userAgentFormat, version.Version)
if add := os.Getenv(uaEnvVar); add != "" {
add = strings.TrimSpace(add)
if len(add) > 0 {
ua += " " + add
log.Printf("[DEBUG] Using modified User-Agent: %s", ua)
}
}
return ua
}