44 lines
1.1 KiB
Go
44 lines
1.1 KiB
Go
package msgpackrpc
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import (
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"errors"
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"net/rpc"
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"sync/atomic"
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"github.com/hashicorp/go-multierror"
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)
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var (
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// nextCallSeq is used to assign a unique sequence number
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// to each call made with CallWithCodec
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nextCallSeq uint64
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)
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// CallWithCodec is used to perform the same actions as rpc.Client.Call but
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// in a much cheaper way. It assumes the underlying connection is not being
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// shared with multiple concurrent RPCs. The request/response must be syncronous.
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func CallWithCodec(cc rpc.ClientCodec, method string, args interface{}, resp interface{}) error {
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request := rpc.Request{
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Seq: atomic.AddUint64(&nextCallSeq, 1),
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ServiceMethod: method,
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}
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if err := cc.WriteRequest(&request, args); err != nil {
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return err
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}
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var response rpc.Response
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if err := cc.ReadResponseHeader(&response); err != nil {
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return err
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}
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if response.Error != "" {
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err := errors.New(response.Error)
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if readErr := cc.ReadResponseBody(nil); readErr != nil {
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err = multierror.Append(err, readErr)
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}
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return rpc.ServerError(err.Error())
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}
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if err := cc.ReadResponseBody(resp); err != nil {
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return err
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}
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return nil
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}
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