Liquid: missing transaction prevouts

[natsoni]

When querying a transaction from electrs at /tx/:txId, it fails with an error if the transaction has an input with a missing prevout (like liquid peg ins):

> curl https://liquid.network/api/tx/2686128adb8d678b1c852bb15c0c6c98fdac4e9626798a52e5a9827d711d7c2e
Transaction missing prevouts

It looks like this behaviour was introduced by 173d613, since running electrs from the parent commit fixes the issue (mempool-electrs 3.0.0-dev-a21a958):

curl http://localhost:3000/tx/2686128adb8d678b1c852bb15c0c6c98fdac4e9626798a52e5a9827d711d7c2e
{"txid":"2686128adb8d678b1c852bb15c0c6c98fdac4e9626798a52e5a9827d711d7c2e","version":2,"locktime":0,"vin":[{"txid":"7b94f15dbfda5f24b3ff486425b02da915419a03f20793fa85f44de20b0c37e7","vout":0,"prevout":null,"scriptsig":"","scriptsig_asm":"","witness":["304402203e66c3c61690e06a6d8394f4cafccd5a842c81e942a0d970ccdc7179b7c1010302200bcb9e76d90ca0fb0ffbc9e6f9fb61fb892632de5ac81605deda495a306b143c01","032abcbb6f2836c2a701d0f0e92743a0a60a64b86c90156bbc99191bc749988377"],"is_coinbase":false,"sequence":4294967295,"is_pegin":true}],"vout":[{"scriptpubkey":"0014602353deacdcd14d4fb4756591958eb18fb5ebe5","scriptpubkey_asm":"OP_0 OP_PUSHBYTES_20 602353deacdcd14d4fb4756591958eb18fb5ebe5","scriptpubkey_type":"v0_p2wpkh","scriptpubkey_address":"ex1qvq348h4vmng56na5w4jer9vwkx8mt6l9um0h0a","value":809953,"asset":"6f0279e9ed041c3d710a9f57d0c02928416460c4b722ae3457a11eec381c526d"},{"scriptpubkey":"","scriptpubkey_asm":"","scriptpubkey_type":"fee","value":47,"asset":"6f0279e9ed041c3d710a9f57d0c02928416460c4b722ae3457a11eec381c526d"}],"size":1062,"weight":1548,"fee":47,"status":{"confirmed":true,"block_height":2666759,"block_hash":"9c8c4340a290a62043ee6eb91ebd5755d8b49bcfc1c1d8fa010cecf5674000e9","block_time":1704310628}}

It results in the Liquid explorer not being able to display peg in transactions:

[junderw]

Can you try out #72 for me? Thanks.

[natsoni]

Can you try out #72 for me? Thanks.

It looks like #72 fixed it. Thanks!
On f0c9fa7:

curl http://localhost:3000/tx/2686128adb8d678b1c852bb15c0c6c98fdac4e9626798a52e5a9827d711d7c2e
{"txid":"2686128adb8d678b1c852bb15c0c6c98fdac4e9626798a52e5a9827d711d7c2e","version":2,"locktime":0,"vin":[{"txid":"7b94f15dbfda5f24b3ff486425b02da915419a03f20793fa85f44de20b0c37e7","vout":0,"prevout":null,"scriptsig":"","scriptsig_asm":"","witness":["304402203e66c3c61690e06a6d8394f4cafccd5a842c81e942a0d970ccdc7179b7c1010302200bcb9e76d90ca0fb0ffbc9e6f9fb61fb892632de5ac81605deda495a306b143c01","032abcbb6f2836c2a701d0f0e92743a0a60a64b86c90156bbc99191bc749988377"],"is_coinbase":false,"sequence":4294967295,"is_pegin":true}],"vout":[{"scriptpubkey":"0014602353deacdcd14d4fb4756591958eb18fb5ebe5","scriptpubkey_asm":"OP_0 OP_PUSHBYTES_20 602353deacdcd14d4fb4756591958eb18fb5ebe5","scriptpubkey_type":"v0_p2wpkh","scriptpubkey_address":"ex1qvq348h4vmng56na5w4jer9vwkx8mt6l9um0h0a","value":809953,"asset":"6f0279e9ed041c3d710a9f57d0c02928416460c4b722ae3457a11eec381c526d"},{"scriptpubkey":"","scriptpubkey_asm":"","scriptpubkey_type":"fee","value":47,"asset":"6f0279e9ed041c3d710a9f57d0c02928416460c4b722ae3457a11eec381c526d"}],"size":1062,"weight":1548,"sigops":0,"fee":47,"status":{"confirmed":true,"block_height":2666759,"block_hash":"9c8c4340a290a62043ee6eb91ebd5755d8b49bcfc1c1d8fa010cecf5674000e9","block_time":1704310628}}