cosmos | A new logic programming language | Interpreter library
kandi X-RAY | cosmos Summary
kandi X-RAY | cosmos Summary
The syntax is close to that of a typical scripting language (Python/JavaScript/Lua). The difference is that whereas traditional scripting languages tend to focus on imperative programming, Cosmos focuses on declarative (logic and functional) programming. Instead of functions, Cosmos has relations. Whereas functions have one output, relations may have zero, one or more outputs. You can check this by making queries at the interpreter. If the system picks one answer and it turns out to be invalid, the system will backtrack and pick the other. When a relation is nested, the last parameter is hidden. Relations may adopt function syntax. When nesting, for example,. Logic-wise, double(4,x) is read as a statement: "the double of 4 is x". double(4) reads as a function; "the double of 4". Tables (also known as maps, dictionaries, etc.) are structures that map keys to values. The language is whitespace sensitive. This could be a single line. It’s possible to drop the whitespace semantics by writing the unnecessary characters, although this is not generally advisable. Note that relations from different lines are separated by ands (semicolons are only used to end the indendation).
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Community Discussions
Trending Discussions on cosmos
QUESTION
Context
I am trying wireup Audit.Net in an MVC5 app with .Net Framework 4.8.
Dataprovider: EntityFramework
Output: Cosmos
DI Provider: Autofac
The Problem
I have tried the following call backs to try and write the username to the AuditEvent.
...ANSWER
Answered 2021-Oct-08 at 14:00The key (which might help in search terms) is async. A quick search for async httpcontext mvc gets us to this existing question with a lot of information about async/await and HttpContext usage.
The super short version: in MVC, the HttpContext gets carried around in the thread synchronization context (which is also where, say, the culture and other thread settings are carried around) but it's expensive to cart that context from thread to thread so the default is to not do that. You need to enable it explicitly to work.
Here's a blog article explaining the various knobs you can turn in web.config to get it to work but the net result is, basically, to make sure is set (well, set that value to 4.5 or higher).
If that's already set, then... maybe there's something else at play, like a call has the ConfigureAwait(false) set on it so it's not returning to a thread context that has the HttpContext. But, more than likely, that httpRuntime flag should fix it.
QUESTION
Since upgrading to version 2.14.5 of the Cosmos DB emulator, I'm seeing high CPU usage by what appears to be the tray icon process (Microsoft.Azure.Cosmos.Emulator.exe). See below, using up most of a CPU core constantly on an Intel i9-12900K. This was an upgrade from 2.14.4 on Windows 11.
Anyone from the emulator team know what might be going on? Seems like the process is doing something silly, given the system is otherwise quiet and the process is not actually doing anything related to serving requests.
Also worth noting is that opening the "About Azure Cosmos Emulator" dialog immediately drops the CPU usage to 0. When closing the dialog, usage jumps back.
...ANSWER
Answered 2022-Mar-21 at 13:30This appears to have been fixed with release of version 2.14.6
QUESTION
I want to find the index number of all items in a nested array in Cosmos DB :
Data :
...ANSWER
Answered 2022-Mar-09 at 04:25There is no built in support on Cosmos SQL API to achieve the above result. But you can implement the following suggestions
You could either write your own logic in User Defined Function or retrieve the data and format it in the way you need on the Client Side
Other way is to just include the index in the data model itself
QUESTION
Is it possible to use EF Core 6 in combination with a MongoDb? From what I'v gathered online, I could only find answers from a few years ago that say that it's still not possible, but nothing that was published recently. There is also better support for the Azure Cosmos Db which is also a NoSql database, so maybe I could use that to communicate with a MongoDb?
If it's still not possible, what other approach should I use?
...ANSWER
Answered 2022-Jan-07 at 08:31There is no official MongoDb provider implementation for EF core at this time, I did not see any mention of MongoDb in the .net core 7 (the next version) roadmap as of now.
See: https://docs.microsoft.com/en-us/ef/core/providers/?tabs=dotnet-core-cli
I quickly googled a bit but could not find a recent version of a MongoDb provider.
Msdn docs also do not use EF core: https://docs.microsoft.com/en-us/aspnet/core/tutorials/first-mongo-app?view=aspnetcore-6.0&tabs=visual-studio
Related SO: MongoDB and Entity Framework Core 2.0
QUESTION
ANSWER
Answered 2022-Feb-22 at 10:59I am not sure if you have seen this message in the portal when you created the account/also mentioned in the doc
"You will not be able to switch between the backup policies after the account has been created"
since you need to select either "Periodic" or "Continuous" at the creation of Cosmos Account, it becomes mandatory.
Update:
You will not see the above in portal anymore, you can Switch from "Periodic" to "Continous" on an existing account and that cannot be reverted. You can read more here.
QUESTION
I am trying to sign a message in go generated via hd wallet's private key using cosmos sdk. Below is the equivalent implementation in python which generates the signed message / signature as expected when submitted/verified is working properly but unable to get it working wtih Go implementation. Any inputs for equivalent golang version of the python implementation is much appreciated. Thank you.
Python version uses sha256 , ecdsa but when using the equivalent cyrpto/ecdsa doesn't return valid signature.
...Python
ANSWER
Answered 2022-Feb-20 at 14:48Both codes return hex encoded as private key
QUESTION
I have a Web Api project which relies heavily on Azure Cosmos DB. Until now, having one Cosmos DB account (one connection string) was sufficient. Now a new requirement is to be able to connect to a different Cosmos (two connection strings) depending on an incoming parameter.
For customerId X we should fetch documents from Cosmos DB 1 and for another customer Y we have to look in Cosmos DB 2.
Until now my Startup.cs file registered a singleton instance of CosmosClient. Which in turn gets instantiated like this cosmosClient = new CosmosClient(endpointUrl, primaryKey); And this worked really well. The Web Api was easily able to process all requests. But now that we have to new up a CosmosClient per request, performance is really bad.
So my question is; Is there a way to have multiple instances of the same singleton? As in; can we create a single instance of the combination Class+EndPointUrl? (Would that still be a singleton?)
Right now, we are newing up thousands of CosmosClients every minute. And we really need just one more compared to what we had earlier.
...ANSWER
Answered 2022-Jan-31 at 09:21There's multiple ways to do this, but an easy implementation would be to create a wrapper around each CosmosClient you use. The only use of the wrapper will be to allow you to use various instances of the CosmosClient and differentiate them by their types.
QUESTION
I am trying to generate hd wallet private keys , public keys and addresess using cosmos sdk. Below is the equivalent implementation in python which generates the keys , address as expected but when trying to generated in golang using cosmos sdk it won't generate same keys. Any inputs for equivalent golang version of the python implementation is much appreciated. Thank you.
...Python
ANSWER
Answered 2022-Feb-13 at 16:24The results of both codes differ because of two issues:
In the Go Code, the private key is derived incorrectly:
In the Python code, the path
m/44'/118'/0'/0/0'is used, as the output ofhdwallet.path()shows. In the Go code, in contrast, the pathm/44'/118'/0'/0/0is used, as shown by the output ofpath.String().To use the path of the Python code in the Go code, the path can be e.g. specified directly. For this the line:
QUESTION
@SpringBootTest(properties = {"spring.profiles.active=build"}, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)`
@TestPropertySource(value = {"classpath:application-test.properties"})
@RunWith(SpringJUnit4ClassRunner.class)
@EnableAutoConfiguration
ANSWER
Answered 2022-Jan-11 at 17:27I had included the annotation
QUESTION
Technologies: Cosmos DB Emulator, Microsoft.Azure.Cosmos 3.23.0
Goal : Add the first item of an array using Path Add
Initial data :
...ANSWER
Answered 2022-Jan-06 at 14:00Finaly I think that it's not possible to do what i want automaticaly.
From Exception Message when you didn't use Transaction :
BadRequest (400); Substatus: 0; ActivityId: c12f915a-3c4a-4d76-bd7d-ad519bbb8f02; Reason: (Message: {"Errors":["For Operation(1): Add Operation can only create a child object of an existing node(array or object) and cannot create path recursively, no path found beyond: 'Products'.
So I manage to do it by my self, it's not realy cleaver but it's work's.
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