client.go: Fix URI client option parsing for supported + unsupported options

Before this patch, the parser ignored options which were already supported
by the client (for instance 'read-only') and even raised an error. But the
client can already use this option: as levin.zimmermann/neoppod@a9246333 describes this should happen in the
local storage URL parser.

Furthermore not-yet-supported client options (for instance compress) broke
the NEO client before this patch. Now these options only raise a warning which
informs the user that they are ignored. Why? We want to use pre-complete NEO
in real-world projects together with NEO/py clusters. Those real-world projects
may already specify options which aren't supported by our NEO/go client yet.
But it doesn't matters so much, because those options are mostly
relevant for other NEO/py cluster clients (e.g. zope nodes). Instead of
filtering those parameters before parsing them to NEO/go in a higher
level (e.g. SlapOS), NEO/go should already support any valid NEO URL
and raise warnings for not yet implemented features.

go/neo/client.go

@@ -26,6 +26,7 @@ import (
 	"math/rand"
 	"net/url"
 	"os"
+	"strconv"
 	"strings"
 	"sync"
 
@@ -37,6 +38,7 @@ import (
 	"lab.nexedi.com/kirr/go123/xnet"
 	"lab.nexedi.com/kirr/go123/xsync"
 
+	"lab.nexedi.com/kirr/neo/go/internal/log"
 	"lab.nexedi.com/kirr/neo/go/internal/task"
 	taskctx "lab.nexedi.com/kirr/neo/go/internal/xcontext/task"
 	"lab.nexedi.com/kirr/neo/go/internal/xurl"
@@ -537,6 +539,27 @@ func parseURL(ctx context.Context, u *url.URL) (urlinfo *urlInfo, err error) {
 		return nil, err
 	}
 
+	// mv readonly from URL => driver opts
+	readOnly, ok := q["read-only"]
+	if ok {
+		delete(q, "read-only")
+		r, err := strconv.ParseBool(readOnly)
+		if err != nil {
+			return nil, err
+		}
+		opt.ReadOnly = r
+	}
+
+	// pop not yet used client options
+	// (our neo client doesn't apply their effect yet)
+	for _, k := range []string {"compress", "cache-size", "logfile"} {
+		_, ok := q[k]
+		if ok {
+			delete(q, k)
+			log.Warningf(ctx, "TODO client doesn't support option '%q' yet", k)
+		}
+	}
+
 	if len(q) != 0 {
 		return nil, fmt.Errorf("invalid query: %v", q)
 	}