77 lines
1.8 KiB
Go
77 lines
1.8 KiB
Go
package liveshare
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import (
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"context"
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"fmt"
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"io"
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"sync"
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"github.com/sourcegraph/jsonrpc2"
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)
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type rpcClient struct {
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*jsonrpc2.Conn
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conn io.ReadWriteCloser
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handler *rpcHandler
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}
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func newRPCClient(conn io.ReadWriteCloser) *rpcClient {
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return &rpcClient{conn: conn, handler: newRPCHandler()}
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}
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func (r *rpcClient) connect(ctx context.Context) {
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stream := jsonrpc2.NewBufferedStream(r.conn, jsonrpc2.VSCodeObjectCodec{})
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r.Conn = jsonrpc2.NewConn(ctx, stream, r.handler)
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}
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func (r *rpcClient) do(ctx context.Context, method string, args, result interface{}) error {
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waiter, err := r.Conn.DispatchCall(ctx, method, args)
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if err != nil {
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return fmt.Errorf("error dispatching %q call: %v", method, err)
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}
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return waiter.Wait(ctx, result)
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}
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type rpcHandler struct {
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mutex sync.Mutex
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eventHandlers map[string][]chan *jsonrpc2.Request
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}
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func newRPCHandler() *rpcHandler {
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return &rpcHandler{
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eventHandlers: make(map[string][]chan *jsonrpc2.Request),
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}
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}
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// TODO: document obligations around chan. It appears to be used for at most one request.
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func (r *rpcHandler) registerEventHandler(eventMethod string) <-chan *jsonrpc2.Request {
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r.mutex.Lock()
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defer r.mutex.Unlock()
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ch := make(chan *jsonrpc2.Request)
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r.eventHandlers[eventMethod] = append(r.eventHandlers[eventMethod], ch)
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return ch
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}
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func (r *rpcHandler) Handle(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) {
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r.mutex.Lock()
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handlers := r.eventHandlers[req.Method]
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r.eventHandlers[req.Method] = nil
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r.mutex.Unlock()
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if len(handlers) > 0 {
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go func() {
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// Broadcast the request to each handler in sequence.
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// TODO rethink this. needs function call.
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for _, handler := range handlers {
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select {
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case handler <- req:
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case <-ctx.Done():
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// TODO: ctx.Err
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break
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}
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}
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}()
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}
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}
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