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internal/mcp: meta and progress token

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Meta is a struct that contains a map[string]any, and a ProgressToken
field.

Each Params and Result type has a Meta as a value field.

Meta marshals and unmarshals specially, so the ProgressToken field
becomes part of the map. The marshalling code is generalized in
anticipation of every Params and Result growing a map of additional
properties.

Change-Id: I6d2f34270d33501c96437f24f91ef3e51d20d955
Reviewed-on: https://go-review.googlesource.com/c/tools/+/674956
Reviewed-by: Sam Thanawalla <samthanawalla@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Robert Findley <rfindley@google.com>
This commit is contained in:
Jonathan Amsterdam 2025-05-21 07:11:50 -04:00 • committed by Gopher Robot
commit 7130f0f081
1 changed files with 548 additions and 115 deletions
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11
jsonschema/validate.go
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@ -616,14 +616,19 @@ func structPropertiesOf(t reflect.Type) propertyMap {
// jsonName returns the name for f as would be used by [json.Marshal].
// That is the name in the json struct tag, or the field name if there is no tag.
// If f is not exported or the tag name is "-", jsonName returns "", false.
// If f is not exported or the tag is "-", jsonName returns "", false.
func jsonName(f reflect.StructField) (string, bool) {
if !f.IsExported() {
return "", false
}
if tag, ok := f.Tag.Lookup("json"); ok {
if name, _, _ := strings.Cut(tag, ","); name != "" {
return name, name != "-"
name, _, found := strings.Cut(tag, ",")
// "-" means omit, but "-," means the name is "-"
if name == "-" && !found {
return "", false
}
if name != "" {
return name, true
}
}
return f.Name, true