73 lines
1.9 KiB
Go
73 lines
1.9 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/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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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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// TODO(adonovan): fix: ensure r.Conn is eventually Closed!
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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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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: %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 rpcHandlerFunc = func(*jsonrpc2.Request)
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type rpcHandler struct {
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handlersMu sync.Mutex
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handlers map[string][]rpcHandlerFunc
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}
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func newRPCHandler() *rpcHandler {
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return &rpcHandler{
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handlers: make(map[string][]rpcHandlerFunc),
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}
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}
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// registerEventHandler registers a handler for the specified event.
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// After the next occurrence of the event, the handler will be called,
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// once, in its own goroutine.
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func (r *rpcHandler) registerEventHandler(eventMethod string, h rpcHandlerFunc) {
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r.handlersMu.Lock()
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r.handlers[eventMethod] = append(r.handlers[eventMethod], h)
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r.handlersMu.Unlock()
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}
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// Handle calls all registered handlers for the request, concurrently, each in its own goroutine.
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func (r *rpcHandler) Handle(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) {
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r.handlersMu.Lock()
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handlers := r.handlers[req.Method]
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r.handlers[req.Method] = nil
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r.handlersMu.Unlock()
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for _, h := range handlers {
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go h(req)
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}
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}
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