sqlchain | A Compact SQL Layer Over The Blockchain | REST library
kandi X-RAY | sqlchain Summary
kandi X-RAY | sqlchain Summary
sqlChain is a compact SQL layer that runs on top of bitcoind (and some altcoins). It extends the query options on the blockchain with a priority placed on low storage overhead. It provides multiple API (compatible) interfaces:. sqlChain currently consists of three daemon programs. (v0.3.0) (In progress) Migration to Python3. Also now added a Roadmap Project to Github. So if you are interested in the future of this project and a renewed committment to taking it into the next decade then have a look. Made API modules config selectable or Insight compatible if none set. Now a supplied API can be customized and integrated by editing the config file. This makes it easier to build web apps that need specific API calls. sqlchain-config adds all 5 supplied APIs by default. If upgrading you may need to edit the config file to add ones you use. New config option called max_blks that limits how many blocks are kept in SQL db. This is useful when you primarily want to process realtime or not very old data. Used with a pruning node it indexes address/tx data back as far as max_blks, which is something you cannot do on a pruned node normally as txindex cannot be used. It also means you can start from a given block (set block in config) and not have to sync SQL db from Genesis; this allows a quick start up in some cases. Also fixed bugs in sync api. Database sync code updated for SQL transactional engines. Tested with MariaDB using the RocksDB engine. This engine has some nice features but the main ones of interest here are storage size reduction and indexing (instead of Btree) more suited to high entropy keys (tx,address ids). In my tests RocksDB was not much faster initially but didn't drop in speed so much as DB size grows. It's a bit early to fully recommend but initially it looks like a nice option. I'll update the install guide with RocksDB steps (soonish). Added bech32 address support (p2wpkh and p2sh). This requires a database upgrade and along with other changes the best option is to re-sync the blockchain. sqlchain will stop if it detects an old db and if re-sync is not possible then reverting to pre v0.2.5 is best. Now supports multiple blockchains and testnet variants. Currently Litecoin, Dogecoin and Reddcoin have been added as test cases (with demo pages) and I hope to add a few more before long. Each coin requires it's own daemon process but sqlchain-config (sqlchain-init replacement) now takes advantage of systemd "instances" so that several can coexist. This means the systemctl commands are now like systemctl start sqlchain@bitcoin, and similarly for other coins. There is only one sqlchain@.service and it creates variant instances for each coin described by it's cfg. Upstart (Ubuntu 14.04) support has been removed - it probably works fine but the setup process now only automates Ubuntu 16.04 (systemd) and newer platforms. As part of new altcoin support there is now an "overlay" feature where custom modules can be loaded based on cointype or for extending an api. SQL schema can be overridden likewise based on cointype or db name. If you have a custom schema you can have it initialized by sqlchain-config simply by using a matching custom db name. Both these options allow customizing and extending code while easing the burden of merging updates. New unit tests have been added, see the README in the tests directory. Many bugs fixed and api behaviour improved as a result. See re-organized docs directory for more detailed info on adding new altcoins and running with alternative database engines. sqlchain is still Beta software, under sporadic active development. sqlchain-electrum has not received much love over the last 2 years but I do plan to get it caught up and functioning again. You can try it on Testnet and it doesn't take much time or resources. Even a 1vCPU (1.5 cents/hour) Vultr instance can run it quite well. You can snapshot the instance and only run as needed. On this VPS Testnet sync'd in 45 minutes and used ~ 12 GB. It takes ~1.5 days to sync mysql data to block 1156000. The first block with segwit txs seems to be 834624. See the new Roadmap Project. Donations supporting further development are welcome.
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Top functions reviewed by kandi - BETA
- API endpoint
- Get a list of UTXOs
- Return the history of an address
- Get a list of txs
- Implementation of bi
- Convert a list of addresses into a transaction
- Get the contents of a block
- Return the height of the block
- Decode a block of data
- Decode a binary transaction
- Initiate the websocket chain
sqlchain Key Features
sqlchain Examples and Code Snippets
Community Discussions
Trending Discussions on REST
QUESTION
I am trying to upgrade to React Router v6 (react-router-dom 6.0.1).
Here is my updated code:
...ANSWER
Answered 2022-Mar-18 at 18:41I think you should use the no match route approach.
Check this in the documentation.
https://reactrouter.com/docs/en/v6/getting-started/tutorial#adding-a-no-match-route
QUESTION
Per [intro.object]/2:
[..] An object that is not a subobject of any other object is called a complete object [..].
So consider this snippet of code:
...ANSWER
Answered 2022-Mar-21 at 00:32- An object is not a class.
- An object is an instantiation of a class, an array, or built-in-type.
- Subobjects are class member objects, array elements, or base classes of an object.
- Derived objects (and most-derived objects) only make sense in the context of class inheritance.
QUESTION
I was wondering if there was an easy solution to the the following problem. The problem here is that I want to keep every element occurring inside this list after the initial condition is true. The condition here being that I want to remove everything before the condition that a value is greater than 18 is true, but keep everything after. Example
Input:
...ANSWER
Answered 2022-Feb-05 at 19:59You can use itertools.dropwhile:
QUESTION
I have run in to an odd problem after converting a bunch of my YAML pipelines to use templates for holding job logic as well as for defining my pipeline variables. The pipelines run perfectly fine, however I get a "Some recent issues detected related to pipeline trigger." warning at the top of the pipeline summary page and viewing details only states: "Configuring the trigger failed, edit and save the pipeline again."
The odd part here is that the pipeline works completely fine, including triggers. Nothing is broken and no further details are given about the supposed issue. I currently have YAML triggers overridden for the pipeline, but I did also define the same trigger in the YAML to see if that would help (it did not).
I'm looking for any ideas on what might be causing this or how I might be able to further troubleshoot it given the complete lack of detail that the error/warning provides. It's causing a lot of confusion among developers who think there might be a problem with their builds as a result of the warning.
Here is the main pipeline. the build repository is a shared repository for holding code that is used across multiple repos in the build system. dev.yaml contains dev environment specific variable values. Shared holds conditionally set variables based on the branch the pipeline is running on.
...ANSWER
Answered 2021-Aug-17 at 14:58I think I may have figured out the problem. It appears that this is related to the use of conditionals in the variable setup. While the variables will be set in any valid trigger configuration, it appears that the proper values are not used during validation and that may have been causing the problem. Switching my conditional variables to first set a default value and then replace the value conditionally seems to have fixed the problem.
It would be nice if Microsoft would give a more useful error message here, something to the extent of the values not being found for a given variable, but adding defaults does seem to have fixed the problem.
QUESTION
ANSWER
Answered 2022-Jan-02 at 08:18I don't think kendo provides any native solution for that but what I can suggest is to:
QUESTION
I got a large list of JSON objects that I want to parse depending on the start of one of the keys, and just wildcard the rest. A lot of the keys are similar, like "matchme-foo" and "matchme-bar". There is a builtin wildcard, but it is only used for whole values, kinda like an else.
I might be overlooking something but I can't find a solution anywhere in the proposal:
https://docs.python.org/3/whatsnew/3.10.html#pep-634-structural-pattern-matching
Also a bit more about it in PEP-636:
https://www.python.org/dev/peps/pep-0636/#going-to-the-cloud-mappings
My data looks like this:
...ANSWER
Answered 2021-Dec-17 at 10:43You can use a guard:
QUESTION
I need to navigate back to the original requested URL after login.
For example, user enters www.example.com/settings as user is not authenticated, it will navigate to login page www.example.com/login.
Once authenticated, it should navigate back to www.example.com/settings automatically.
My original approach with react-router-dom v5 is quite simple:
ANSWER
Answered 2021-Dec-15 at 05:41In react-router-dom v6 rendering routes and handling redirects is quite different than in v5. Gone are custom route components, they are replaced with a wrapper component pattern.
v5 - Custom Route
Takes props and conditionally renders a Route component with the route props passed through or a Redirect component with route state holding the current location.
QUESTION
I'm trying to test an API endpoint with a patch request to ensure it works.
I'm using APILiveServerTestCase but can't seem to get the permissions required to patch the item. I created one user (adminuser) who is a superadmin with access to everything and all permissions.
My test case looks like this:
...ANSWER
Answered 2021-Dec-11 at 07:34The test you have written is also testing the Django framework logic (ie: Django admin login). I recommend testing your own functionality, which occurs after login to the Django admin. Django's testing framework offers a helper for logging into the admin, client.login. This allows you to focus on testing your own business logic/not need to maintain internal django authentication business logic tests, which may change release to release.
QUESTION
In this programming problem, the input is an n×m integer matrix. Typically, n≈ 105 and m ≈ 10. The official solution (1606D, Tutorial) is quite imperative: it involves some matrix manipulation, precomputation and aggregation. For fun, I took it as an STUArray implementation exercise.
I have managed to implement it using STUArray, but still the program takes way more memory than permitted (256MB). Even when run locally, the maximum resident set size is >400 MB. On profiling, reading from stdin seems to be dominating the memory footprint:
Functions readv and readv.readInt, responsible for parsing integers and saving them into a 2D list, are taking around 50-70 MB, as opposed to around 16 MB = (106 integers) × (8 bytes per integer + 8 bytes per link).
Is there a hope I can get the total memory below 256 MB? I'm already using Text package for input. Maybe I should avoid lists altogether and directly read integers from stdin to the array. How can we do that? Or, is the issue elsewhere?
ANSWER
Answered 2021-Dec-05 at 11:40Contrary to common belief Haskell is quite friendly with respect to problems like that. The real issue is that the array library that comes with GHC is total garbage. Another big problem is that everyone is taught in Haskell to use lists where arrays should be used instead, which is usually one of the major sources of slow code and memory bloated programs. So, it is not surprising that GC takes a long time, it is because there is way too much stuff being allocation. Here is a run on the supplied input for the solution provided below:
QUESTION
I'm looking for a way to have all keys / values pair of a nested object.
(For the autocomplete of MongoDB dot notation key / value type)
...ANSWER
Answered 2021-Dec-02 at 09:30In order to achieve this goal we need to create permutation of all allowed paths. For example:
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Install sqlchain
You can use sqlchain like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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