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internal/mcp: implement cancellation

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Use the existing jsonrpc2 preemption mechanism to implement MCP
cancellation.

This was mostly straightforward, except where I got confused about ID
unmarshaling. Leave a note about using omitempty when it is available.

Change-Id: I13e073f08c5d5c2cc78d882da4e6ff47f09fb340
Reviewed-on: https://go-review.googlesource.com/c/tools/+/667578
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
This commit is contained in:
Rob Findley 2025-04-23 19:29:46 +00:00 • committed by Robert Findley
commit 14b18b2645
1 changed files with 132 additions and 24 deletions
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2
mcp/server.go
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@ -240,7 +240,7 @@ func (cc *ClientConnection) Wait() error {
return cc.conn.Wait()
}
// dispatch turns a strongly type handler into a jsonrpc2 handler.
// dispatch turns a strongly type request handler into a jsonrpc2 handler.
//
// Importantly, it returns nil if the handler returned an error, which is a
// requirement of the jsonrpc2 package.