87 lines
2 KiB
Go
87 lines
2 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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"time"
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"github.com/opentracing/opentracing-go"
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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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handlersMu sync.Mutex
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handlers map[string][]*handlerWrapper
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}
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func newRPCClient(conn io.ReadWriteCloser) *rpcClient {
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return &rpcClient{conn: conn, handlers: make(map[string][]*handlerWrapper)}
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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)
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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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span, ctx := opentracing.StartSpanFromContext(ctx, method)
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defer span.Finish()
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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: %w", method, err)
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}
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// timeout for waiter in case a connection cannot be made
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waitCtx, cancel := context.WithTimeout(ctx, 2*time.Minute)
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defer cancel()
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return waiter.Wait(waitCtx, result)
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}
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type handler func(conn *jsonrpc2.Conn, req *jsonrpc2.Request)
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type handlerWrapper struct {
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fn handler
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}
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func (r *rpcClient) register(requestType string, fn handler) func() {
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r.handlersMu.Lock()
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defer r.handlersMu.Unlock()
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h := &handlerWrapper{fn: fn}
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r.handlers[requestType] = append(r.handlers[requestType], h)
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return func() {
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r.deregister(requestType, h)
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}
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}
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func (r *rpcClient) deregister(requestType string, handler *handlerWrapper) {
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r.handlersMu.Lock()
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defer r.handlersMu.Unlock()
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handlers := r.handlers[requestType]
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for i, h := range handlers {
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if h == handler {
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// Swap h with last element and pop.
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last := len(handlers) - 1
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handlers[i], handlers[last] = handlers[last], nil
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r.handlers[requestType] = handlers[:last]
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break
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}
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}
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}
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func (r *rpcClient) Handle(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) {
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r.handlersMu.Lock()
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defer r.handlersMu.Unlock()
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for _, handler := range r.handlers[req.Method] {
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go handler.fn(conn, req)
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}
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}
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