fix: wallet examples

[storopoli]

Description

Fix wallet examples.

Closes #1434

Notes to the reviewers

• Print balances only in BTC
• Fix wallet_esplora_async printing the KeychainKind twice, and forgets to print spk0
• Change wallet examples to use mempool.space (Electrum) or BDK's signet (Esplora) to fix rate limiting issues, along with more conservative PARALLEL_REQUESTS
• Standardize code for wallet_esplora_*

Changelog notice

• fix BDK wallet example crates

Checklists

All Submissions:

• I've signed all my commits
• I followed the contribution guidelines
• I ran cargo fmt and cargo clippy before committing

New Features:

• I've added tests for the new feature
• I've added docs for the new feature

Bugfixes:

• This pull request breaks the existing API
• I've added tests to reproduce the issue which are now passing
• I'm linking the issue being fixed by this PR

[oleonardolima]

ACK 214fa09

I'm just wondering if we should add a new dependency, but I don't see much problem as it's only on the example-crates

[storopoli]

ACK 214fa09

I'm just wondering if we should add a new dependency, but I don't see much problem as it's only on the example-crates

But then it adds extra compile time and further surface for conflicts and other errors in all CI tests and Clippy checks...

That's the overhead that I referred to.

[ValuedMammal]

I'm just wondering if we should add a new dependency, but I don't see much problem as it's only on the example-crates

But then it adds extra compile time and further surface for conflicts and other errors in all CI tests and Clippy checks...

That's the overhead that I referred to.

We could use Wallet::new_no_persist and forget about bringing in tempfile, but that would make the examples somewhat less illustrative. I recommended tempfile because otherwise the db file is left lingering in your system's tempdir which is kind of a nuisance #1045

[ValuedMammal]

I left a few comments. Additionally we should fix printing balances for wallet_rpc like you have in 96c0129, but besides that I think the rpc example is mostly fine. Also, what do you think about switching the examples to use Signet?

[oleonardolima]

utACK eeb3b7c

[ValuedMammal]

ACK eeb3b7c

[oleonardolima]

ACK cf22595

[storopoli]

We might need to revisit this after #1128 was merged.
I only changed the async esplora wallet example,
so we might need to change the explora blocking and elecrum wallet examples.

Since we are using the bdk_sqlite crate now, we don't need tempdir.

[storopoli]

We might need to revisit this after #1128 was merged. I only changed the async esplora wallet example, so we might need to change the explora blocking and elecrum wallet examples.

Since we are using the bdk_sqlite crate now, we don't need tempdir.

Done! We are using bdk_sqlite now instead of tempdir in all wallet_* examples.

Ready for a new quick round of reviews @ValuedMammal and @oleonardolima

[oleonardolima]

@storopoli It didn't work for me when using the mempool.space, only with blockstream's one 🤔, was it working for you ?

Error: Made one or multiple attempts, all errored:
	- Socket is not connected (os error 57)

[storopoli]

Yes I've successfully run it twice behind a mullvad VPN by the way

[oleonardolima]

Weird, it only worked for me when I disabled the VPN 👀

[oleonardolima]

ACK 982756f

[ValuedMammal]

ACK 982756f

This is beautiful. I'm wondering if we should change the faucet address to one that we know will be able to recycle the sats, probably doesn't need to be done now though, and to be honest I usually don't broadcast when running the example code anyway.