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Merge pull request #317 from forta-network/caner/json-rpc-redundancy
Support a ring of fallback RPCs in Ethereum client
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,47 @@ | ||
| package provider | ||
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| import ( | ||
| "github.com/forta-network/forta-core-go/utils/slicering" | ||
| ) | ||
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| // Element is the type of element provided by the provider. | ||
| type Element interface { | ||
| Close() | ||
| } | ||
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| // Provider keeps one or many elements provides when requested. | ||
| type Provider[T Element] interface { | ||
| Provide() T | ||
| Next() T | ||
| Close() | ||
| } | ||
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| // RingProvider provides elements from a slice-backed thread-safe ring. | ||
| type RingProvider[T Element] struct { | ||
| *slicering.ThreadSafeRing[T] | ||
| } | ||
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| // NewRingProvider creates a new ring provider. | ||
| func NewRingProvider[T Element](elements ...T) Provider[T] { | ||
| return &RingProvider[T]{ThreadSafeRing: slicering.NewThreadSafeRing(elements...)} | ||
| } | ||
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| // Provide provides the currently pointed element. | ||
| func (rp *RingProvider[T]) Provide() T { | ||
| return rp.Current() | ||
| } | ||
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| // Close closes all elements in the ring. | ||
| func (rp *RingProvider[T]) Close() { | ||
| for _, el := range rp.Elements() { | ||
| el.Close() | ||
| } | ||
| } | ||
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| // Ensuring type checks below. | ||
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| var _ Provider[*dummyElement] = &RingProvider[*dummyElement]{} | ||
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| type dummyElement struct{} | ||
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| func (dc *dummyElement) Close() {} |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| package provider_test | ||
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| import ( | ||
| "testing" | ||
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| "github.com/forta-network/forta-core-go/ethereum/provider" | ||
| "github.com/stretchr/testify/require" | ||
| ) | ||
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| type testElement struct { | ||
| closed bool | ||
| } | ||
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| func (te *testElement) Close() { | ||
| te.closed = true | ||
| } | ||
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| func TestRingProvider(t *testing.T) { | ||
| r := require.New(t) | ||
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| el1 := &testElement{} | ||
| el2 := &testElement{} | ||
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| p := provider.NewRingProvider(el1, el2) | ||
| r.Equal(el1, p.Provide()) | ||
| r.Equal(el1, p.Provide()) | ||
| r.Equal(el2, p.Next()) | ||
| r.Equal(el2, p.Provide()) | ||
| r.Equal(el1, p.Next()) | ||
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| r.False(el1.closed) | ||
| r.False(el2.closed) | ||
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| p.Close() | ||
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| r.True(el1.closed) | ||
| r.True(el2.closed) | ||
| } |
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