Update rpc client to get_events by passing topics as [TopicFilter]

[elizabethengelman]

What

closes #2021

related rpc-client pr: stellar/rs-stellar-rpc-client#57

Updates the topic filter structure that is being passed to the rpc server getEvents method, to align with it's expected API.

The GetEventsRequest, from the rpc server, is expecting the topics to be an array of TopicFilters, and a TopicFilter is an array of SegmentFilters. So it is expecting an array of arrays.

type TopicFilter []SegmentFilter
type SegmentFilter struct {
	Wildcard *string    `json:"-"`
	ScVal    *xdr.ScVal `json:"-"`
}
type EventFilter struct {
	EventType   EventTypeSet  `json:"type,omitempty"`
	ContractIDs []string      `json:"contractIds,omitempty"`
	Topics      []TopicFilter `json:"topics,omitempty"`
}

cargo run events --start-ledger 757126 --type contract --topic 'AAAADwAAAAh0cmFuc2Zlcg=='  --topic 'AAAADwAAAAh0cmFuc2Zlcg==,**" --network testnet

Why

We are currently just passing in a segment filter, without nesting it in an array of arrays, and are seeing an error when doing so.

❌ error: ErrorObject { code: InvalidParams, message: "invalid parameters", data: Some(RawValue("json: cannot unmarshal string into Go struct field EventFilter.filters.topics of type protocol.TopicFilter")) }

Known limitations

n/a

[mootz12]

LG2M. Noticed one check that was missing.

[mootz12]

LG2M!