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client/dcr: Remove GetRawTransaction. #3012

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JoeGruffins
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GetRawTransaction will error if txindex is not specified on the node, and until now GetTransaction has been good enough for client.

Until 12a90a7 we were only using GetRawTransaction for mempool redemptions, which it will not error for https://github.com/decred/dcrd/blob/7735cbb4e11b61636e88ad07e9ad8c1a30dd4047/internal/rpcserver/rpcserver.go#L2899

closes #2947

@JoeGruffins
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I will fix tests if these changes look like the right direction. They may take a little work.

@@ -3787,12 +3779,12 @@ func (dcr *ExchangeWallet) findRedemptionsInMempool(contractOutpoints []outPoint
}

for _, txHash := range mempoolTxs {
tx, err := dcr.wallet.GetRawTransaction(dcr.ctx, txHash)
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Doesn't getrawtransaction work for mempool transaction even if txindex is not enabled?

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Yes, for mempool transactions.

Should we leave it in with a note that it can only be used for mempool?

My reasoning is that if GetTransaction is good enough for rpc clients with an spv node, then it's good enough for full nodes.

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Just to note for testing: the dcr simnet test harness node alpha has --txindex; node beta does not have a tx index.

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beta wallet is also an --spv wallet so I dont think we have a simnet wallet connecting to beta node

@buck54321
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Made you a conflict @JoeGruffins. Don't miss the spelling fix for received.

@JoeGruffins
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Ill work on fixing the tests.

@@ -4654,7 +4655,7 @@ func TestFindBond(t *testing.T) {
}, {
name: "bad msgtx",
coinID: bond.CoinID,
txRes: txFn(nil, bond.SignedTx[1:]),
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I have not idea why I had to change this, maybe I should.

GetRawTransaction will error if txindex is not specified on the node,
and until now GetTransaction has been good enough for client.
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dcr: rpc wallet needs --txindex with v1.0.0
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