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Preventing panics of RecoverableError casts #2267

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merged 4 commits into from
Feb 1, 2017
Merged

Preventing panics of RecoverableError casts #2267

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09ba15f
Preventing panics of RecoverableError casts
Feb 1, 2017
5326ad3
Properly dealing with non-nil errors.
Feb 1, 2017
57c9ff3
Third time is a charm.
Feb 1, 2017
e887e80
fmt
Feb 1, 2017
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8 changes: 5 additions & 3 deletions nomad/node_endpoint.go
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Original file line number Diff line number Diff line change
Expand Up @@ -944,7 +944,9 @@ func (n *Node) DeriveVaultToken(args *structs.DeriveVaultTokenRequest,
// setErr is a helper for setting the recoverable error on the reply and
// logging it
setErr := func(e error, recoverable bool) {
reply.Error = structs.NewRecoverableError(e, recoverable).(*structs.RecoverableError)
if rerr, ok := structs.NewRecoverableError(e, recoverable).(*structs.RecoverableError); ok {
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This approach will still log an error even when e is nil.

Instead I would just check if e is nil and return early:

setErr := func(...) {
    if e == nil { return }

    // ...existing code...
}

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Oh, right. nil is "castable" to *structs.RecoverableError.

reply.Error = rerr
}
n.srv.logger.Printf("[ERR] nomad.client: DeriveVaultToken failed (recoverable %v): %v", recoverable, e)
}

Expand Down Expand Up @@ -1133,8 +1135,8 @@ func (n *Node) DeriveVaultToken(args *structs.DeriveVaultTokenRequest,

if rerr, ok := createErr.(*structs.RecoverableError); ok {
reply.Error = rerr
} else {
reply.Error = structs.NewRecoverableError(createErr, false).(*structs.RecoverableError)
} else if rerr, ok = structs.NewRecoverableError(createErr, false).(*structs.RecoverableError); ok {
reply.Error = rerr
}

return nil
Expand Down