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[#746] morph: Implement and use multi-client

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There is a need to work with a set of Neo RPC nodes in order not to depend
on the failure of some nodes while others are active.

Support "multi-client" mode of morph `Client` entity. If instance is not
"multi-client", it works as before. Constructor `New` creates multi-client,
and each method performs iterating over the fixed set of endpoints until
success. Opened client connections are cached (without eviction for now).

Storage (as earlier) and IR (from now) nodes can be configured with multiple
Neo endpoints. As above, `New` creates multi-client instance, so we don't
need initialization changes on app-side.

`Wait` and `GetDesignateHash` methods of `Client` return an error from now
to detect connection errors. `NotaryEnabled` method is removed as unused.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
This commit is contained in:
Leonard Lyubich 2021-08-26 10:59:02 +03:00 • committed by Alex Vanin
parent f9218bf84f
commit ad7ad12a0c
7 changed files with 345 additions and 89 deletions
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9
pkg/innerring/innerring.go
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@ -866,13 +866,20 @@ func createListener(ctx context.Context, p *chainParams) (event.Listener, error)
}
func createClient(ctx context.Context, p *chainParams) (*client.Client, error) {
// config name left unchanged for compatibility, may be its better to rename it to "endpoints" or "clients"
endpoints := p.cfg.GetStringSlice(p.name + ".endpoint.client")
if len(endpoints) == 0 {
return nil, fmt.Errorf("%s chain client endpoints not provided", p.name)
}
return client.New(
p.key,
p.cfg.GetString(p.name+".endpoint.client"),
endpoints[0],
client.WithContext(ctx),
client.WithLogger(p.log),
client.WithDialTimeout(p.cfg.GetDuration(p.name+".dial_timeout")),
client.WithSigner(p.sgn),
client.WithExtraEndpoints(endpoints[1:]),
)
}