Merge pull request #58 from keep-network/template-past-events

Adding a template function to retrieve past events Adds a template to generate functions that retrieve past events that happened on-chain.
keep-network · Nov 16, 2020 · 8af0579 · 8af0579
2 parents 977a23a + 016d77a
commit 8af0579
Show file tree

Hide file tree

Showing 2 changed files with 58 additions and 0 deletions.
diff --git a/tools/generators/ethereum/contract_events.go.tmpl b/tools/generators/ethereum/contract_events.go.tmpl
@@ -6,6 +6,35 @@ type {{$contract.FullVar}}{{$event.CapsName}}Func func(
     {{$event.ParamDeclarations -}}
 )
 
+func ({{$contract.ShortVar}} *{{$contract.Class}}) Past{{$event.CapsName}}Events(
+	startBlock uint64,
+	endBlock *uint64,
+	{{$event.IndexedFilterDeclarations -}}
+) ([]*abi.{{$contract.AbiClass}}{{$event.CapsName}}, error){
+	iterator, err := {{$contract.ShortVar}}.contract.Filter{{$event.CapsName}}(
+		&bind.FilterOpts{
+			Start: startBlock,
+			End:   endBlock,
+		},
+		{{$event.IndexedFilters}}
+	)
+	if err != nil {
+		return nil, fmt.Errorf(
+			"error retrieving past {{$event.CapsName}} events: [%v]",
+			err,
+		)
+	}
+
+	events := make([]*abi.{{$contract.AbiClass}}{{$event.CapsName}}, 0)
+
+	for iterator.Next() {
+		event := iterator.Event
+		events = append(events, event)
+	}
+
+	return events, nil
+}
+
 func ({{$contract.ShortVar}} *{{$contract.Class}}) Watch{{$event.CapsName}}(
 	success {{$contract.FullVar}}{{$event.CapsName}}Func,
 	fail func(err error) error,

diff --git a/tools/generators/ethereum/contract_events_template_content.go b/tools/generators/ethereum/contract_events_template_content.go
@@ -9,6 +9,35 @@ type {{$contract.FullVar}}{{$event.CapsName}}Func func(
     {{$event.ParamDeclarations -}}
 )
 
+func ({{$contract.ShortVar}} *{{$contract.Class}}) Past{{$event.CapsName}}Events(
+	startBlock uint64,
+	endBlock *uint64,
+	{{$event.IndexedFilterDeclarations -}}
+) ([]*abi.{{$contract.AbiClass}}{{$event.CapsName}}, error){
+	iterator, err := {{$contract.ShortVar}}.contract.Filter{{$event.CapsName}}(
+		&bind.FilterOpts{
+			Start: startBlock,
+			End:   endBlock,
+		},
+		{{$event.IndexedFilters}}
+	)
+	if err != nil {
+		return nil, fmt.Errorf(
+			"error retrieving past {{$event.CapsName}} events: [%v]",
+			err,
+		)
+	}
+
+	events := make([]*abi.{{$contract.AbiClass}}{{$event.CapsName}}, 0)
+
+	for iterator.Next() {
+		event := iterator.Event
+		events = append(events, event)
+	}
+
+	return events, nil
+}
+
 func ({{$contract.ShortVar}} *{{$contract.Class}}) Watch{{$event.CapsName}}(
 	success {{$contract.FullVar}}{{$event.CapsName}}Func,
 	fail func(err error) error,