X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/3aaefcb3c76ff470b475d950398d01255e87712a..f1f74069850d8c5e987ef7d7fc246735ff94d58d:/sdk/go/arvados/client.go

diff --git a/sdk/go/arvados/client.go b/sdk/go/arvados/client.go
index 52c75d5113..24d5ac3e33 100644
--- a/sdk/go/arvados/client.go
+++ b/sdk/go/arvados/client.go
@@ -9,8 +9,10 @@ import (
 	"context"
 	"crypto/tls"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
+	"io/fs"
 	"io/ioutil"
 	"log"
 	"net/http"
@@ -67,6 +69,10 @@ type Client struct {
 	dd *DiscoveryDocument
 
 	defaultRequestID string
+
+	// APIHost and AuthToken were loaded from ARVADOS_* env vars
+	// (used to customize "no host/token" error messages)
+	loadedFromEnv bool
 }
 
 // InsecureHTTPClient is the default http.Client used by a Client with
@@ -97,11 +103,60 @@ func NewClientFromConfig(cluster *Cluster) (*Client, error) {
 }
 
 // NewClientFromEnv creates a new Client that uses the default HTTP
-// client with the API endpoint and credentials given by the
-// ARVADOS_API_* environment variables.
+// client, and loads API endpoint and credentials from ARVADOS_*
+// environment variables (if set) and
+// $HOME/.config/arvados/settings.conf (if readable).
+//
+// If a config exists in both locations, the environment variable is
+// used.
+//
+// If there is an error (other than ENOENT) reading settings.conf,
+// NewClientFromEnv logs the error to log.Default(), then proceeds as
+// if settings.conf did not exist.
+//
+// Space characters are trimmed when reading the settings file, so
+// these are equivalent:
+//
+//   ARVADOS_API_HOST=localhost\n
+//   ARVADOS_API_HOST=localhost\r\n
+//   ARVADOS_API_HOST = localhost \n
+//   \tARVADOS_API_HOST = localhost\n
 func NewClientFromEnv() *Client {
+	vars := map[string]string{}
+	home := os.Getenv("HOME")
+	conffile := home + "/.config/arvados/settings.conf"
+	if home == "" {
+		// no $HOME => just use env vars
+	} else if settings, err := os.ReadFile(conffile); errors.Is(err, fs.ErrNotExist) {
+		// no config file => just use env vars
+	} else if err != nil {
+		// config file unreadable => log message, then use env vars
+		log.Printf("continuing without loading %s: %s", conffile, err)
+	} else {
+		for _, line := range bytes.Split(settings, []byte{'\n'}) {
+			kv := bytes.SplitN(line, []byte{'='}, 2)
+			k := string(bytes.TrimSpace(kv[0]))
+			if len(kv) != 2 || !strings.HasPrefix(k, "ARVADOS_") {
+				// Same behavior as python sdk:
+				// silently skip leading # (comments),
+				// blank lines, typos, and non-Arvados
+				// vars.
+				continue
+			}
+			vars[k] = string(bytes.TrimSpace(kv[1]))
+		}
+	}
+	for _, env := range os.Environ() {
+		if !strings.HasPrefix(env, "ARVADOS_") {
+			continue
+		}
+		kv := strings.SplitN(env, "=", 2)
+		if len(kv) == 2 {
+			vars[kv[0]] = kv[1]
+		}
+	}
 	var svcs []string
-	for _, s := range strings.Split(os.Getenv("ARVADOS_KEEP_SERVICES"), " ") {
+	for _, s := range strings.Split(vars["ARVADOS_KEEP_SERVICES"], " ") {
 		if s == "" {
 			continue
 		} else if u, err := url.Parse(s); err != nil {
@@ -113,16 +168,17 @@ func NewClientFromEnv() *Client {
 		}
 	}
 	var insecure bool
-	if s := strings.ToLower(os.Getenv("ARVADOS_API_HOST_INSECURE")); s == "1" || s == "yes" || s == "true" {
+	if s := strings.ToLower(vars["ARVADOS_API_HOST_INSECURE"]); s == "1" || s == "yes" || s == "true" {
 		insecure = true
 	}
 	return &Client{
 		Scheme:          "https",
-		APIHost:         os.Getenv("ARVADOS_API_HOST"),
-		AuthToken:       os.Getenv("ARVADOS_API_TOKEN"),
+		APIHost:         vars["ARVADOS_API_HOST"],
+		AuthToken:       vars["ARVADOS_API_TOKEN"],
 		Insecure:        insecure,
 		KeepServiceURIs: svcs,
 		Timeout:         5 * time.Minute,
+		loadedFromEnv:   true,
 	}
 }
 
@@ -211,6 +267,8 @@ func (c *Client) DoAndDecode(dst interface{}, req *http.Request) error {
 		return err
 	}
 	switch {
+	case resp.StatusCode == http.StatusNoContent:
+		return nil
 	case resp.StatusCode == http.StatusOK && dst == nil:
 		return nil
 	case resp.StatusCode == http.StatusOK:
@@ -312,6 +370,12 @@ func (c *Client) RequestAndDecodeContext(ctx context.Context, dst interface{}, m
 		// Ensure body is closed even if we error out early
 		defer body.Close()
 	}
+	if c.APIHost == "" {
+		if c.loadedFromEnv {
+			return errors.New("ARVADOS_API_HOST and/or ARVADOS_API_TOKEN environment variables are not set")
+		}
+		return errors.New("arvados.Client cannot perform request: APIHost is not set")
+	}
 	urlString := c.apiURL(path)
 	urlValues, err := anythingToValues(params)
 	if err != nil {