102 lines
2.4 KiB
Go
102 lines
2.4 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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requestHandler *requestHandler
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}
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func newRPCClient(conn io.ReadWriteCloser) *rpcClient {
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return &rpcClient{conn: conn, requestHandler: newRequestHandler()}
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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.requestHandler)
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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 handlerFn func(conn *jsonrpc2.Conn, req *jsonrpc2.Request)
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type handlerSt struct {
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fn handlerFn
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}
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type requestHandler struct {
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handlersMu sync.Mutex
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handlers map[string][]*handlerSt
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}
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func newRequestHandler() *requestHandler {
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return &requestHandler{handlers: make(map[string][]*handlerSt)}
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}
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func (r *requestHandler) register(requestType string, fn handlerFn) func() {
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r.handlersMu.Lock()
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defer r.handlersMu.Unlock()
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h := &handlerSt{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 *requestHandler) deregister(requestType string, handler *handlerSt) {
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r.handlersMu.Lock()
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defer r.handlersMu.Unlock()
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if handlers, ok := r.handlers[requestType]; ok {
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newHandlers := []*handlerSt{}
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for _, h := range handlers {
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if h != handler {
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newHandlers = append(newHandlers, h)
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}
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}
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r.handlers[requestType] = newHandlers
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if len(r.handlers[requestType]) == 0 {
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delete(r.handlers, requestType)
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}
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}
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}
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func (r *requestHandler) getHandlers(requestType string) []*handlerSt {
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r.handlersMu.Lock()
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defer r.handlersMu.Unlock()
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return r.handlers[requestType]
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}
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func (r *requestHandler) Handle(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) {
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for _, handler := range r.getHandlers(req.Method) {
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go handler.fn(conn, req)
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}
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}
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