micro | Asynchronous HTTP microservices | Microservice library
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kandi X-RAY | micro Summary
Asynchronous HTTP microservices
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- Start a server .
- Register shutdown handler
- Starts the application .
- Determines whether a stream is readable .
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micro Key Features
micro Examples and Code Snippets
Lines of Code : 161License : Strong Copyleft (CC BY-SA 4.0)
CopyLoop
{
RS232_FileHandle := RS232_Initialize()
if (RS232_FileHandle)
{
; Turn them all off
(1 = GetKeyState("NumLock", "T")) ? RS232_Write(RS232_FileHandle, "219") : NA
Sleep, 750
(1 = GetKeyState("CapsLock", "T")) ? RLinux patrick-X470-AORUS-ULTRA-GAMING 5.5.10-050510-generic #202003180732 SMP Wed Mar 18 07:35:23 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
patrick@patrick-X470-AORUS-ULTRA-GAMING
OS: Ubuntu 18.04 bionic
Kernel: xconst { send } = require('micro')
const { router, get } = require('microrouter')
const { MongoClient } = require('mongodb')
var pantry = null
MongoClient.connect('mongodb://localhost')
.then(conn => {
pantry = conn.db('test').cotestWidgets('When micro permission denied, should show error message.',
(WidgetTester tester) async {
when(staticWrapper.requestPermission(Permission.RecordAudio))
.thenAnswer((_) => Future.value(PermissionStatus.denied));
// Micro handler
const { createNamespace } = require('continuation-local-storage')
let namespace = createNamespace('foo')
const handler = async (req, res) => {
const clientId = // some header thing or host
namespace.run(function()function mainLoop(time){ // time in ms accurate to 1 micro second 1/1,000,000th second
requestAnimationFrame(mainLoop);
}
requestAnimationFrame(mainLoop);
var frameRate = 1000/60;
var lastFrame = 0;
var startTipublic class AuthFilter extends ZuulFilter {
@Autowired
RestTemplate restTemplate;
@Override
public String filterType() {
return "pre";
}
@Override
public int filterOrder() {
return 1;
}
// Stereo
var log = (data)=>console.log(data);
var audioCtx = new AudioContext(); // get audio context
var pixelPlayTime,sBuffers,ctx,can,startTime,source; // sBuffers is the wav form array
// load image
var image = new Image;
imdeclare function local:map ($denominacion as xs:string) as xs:string {
if (contains($denominacion, 'Placa'))
then 'placa'
else if (contains($denominacion, 'Memoria'))
then 'memoria'
else if (contains($denominacion, 'Micro'))
thCommunity Discussions
Trending Discussions on micro
QUESTION
I have created a docker image with the Docker file below. It installs the latest versions of Google Chrome and the chrome driver. As well as the other pip packages.
Dockerfile
...ANSWER
Answered 2021-Sep-02 at 04:57In Python-Selenium I wouldn't pass the chromedriver path, instead I will use auto installer, so that it won't fail in such cases.
chromedriver-autoinstallerAutomatically download and install chromedriver that supports the currently installed version of chrome. This installer supports Linux, MacOS and Windows operating systems.
QUESTION
I am looking at https://github.com/pypa/setuptools_scm
and I read this part https://github.com/pypa/setuptools_scm#version-number-construction
and i quote
Semantic versioning for projects with release branches. The same as guess-next-dev (incrementing the pre-release or micro segment) if on a release branch: a branch whose name (ignoring namespace) parses as a version that matches the most recent tag up to the minor segment. Otherwise if on a non-release branch, increments the minor segment and sets the micro segment to zero, then appends .devN.
How does this work?
Assuming my setup is at this commit https://github.com/simkimsia/test-setup-py/commit/5ebab14b16b63090ad0554ad8f9a77a28b047323
and the same repo, how do i increment the version by branching?
What i tried on 2022-03-15I updated some files on main branch.
Then i did the following
...ANSWER
Answered 2022-Mar-13 at 15:39If I'm reading the docs correctly, this likely means you are supposed to create branches like so (assuming your current version is 0.x):
QUESTION
I'm experimenting with some options for an endpoint pen-testing lab for a Windows environment, and Docker seems like a pretty light-weight and easily configurable option. However, upon testing Windows Defender within this setup I'm faced with errors and every help thread answer I've found on it has just resulted in more errors. Is running Windows Defender in a docker container not doable?
What I've tried:
Ran a docker Windows container:
...ANSWER
Answered 2022-Jan-04 at 06:56What a nightmare! but I got it working for both 1809 and 20h2.
QUESTION
We have micro service which consumes(subscribes)messages from 50+ RabbitMQ queues.
Producing message for this queue happens in two places
The application process when encounter short delayed execution business logic ( like send emails OR notify another service), the application directly sends the message to exchange ( which in turn it is sent to the queue ).
When we encounter long/delayed execution business logic We have
messagestable which has entries of messages which has to be executed after some time.
Now we have cron worker which runs every 10 mins which scans the messages table and pushes the messages to RabbitMQ.
Let's say the messages table has 10,000 messages which will be queued in next cron run,
- 9.00 AM - Cron worker runs and it queues 10,000 messages to RabbitMQ queue.
- We do have subscribers which are listening to the queue and start consuming the messages, but due to some issue in the system or 3rd party response time delay it takes each message to complete
1 Min. - 9.10 AM - Now cron worker once again runs next 10 Mins and see there are yet 9000+ messages yet to get completed and time is also crossed so once again it pushes 9000+ duplicates messages to Queue.
Note: The subscribers which consumes the messages are idempotent, so there is no issue in duplicate processing
Design Idea I had in my mind but not best logicI can have 4 status ( RequiresQueuing, Queued, Completed, Failed )
- Whenever a message is inserted i can set the status to
RequiresQueuing - Next when cron worker picks and pushes the messages successfully to Queue i can set it to
Queued - When subscribers completes it mark the queue status as
Completed / Failed.
There is an issue with above logic, let's say RabbitMQ somehow goes down OR in some use we have purge the queue for maintenance.
Now the messages which are marked as Queued is in wrong state, because they have to be once again identified and status needs to be changed manually.
Let say I have RabbitMQ Queue named ( events )
This events queue has 5 subscribers, each subscribers gets 1 message from the queue and post this event using REST API to another micro service ( event-aggregator ). Each API Call usually takes 50ms.
Use Case:
- Due to high load the numbers events produced becomes 3x.
- Also the micro service ( event-aggregator ) which accepts the event also became slow in processing, the response time increased from 50ms to 1 Min.
- Cron workers follows your design mentioned above and queues the message for each min. Now the queue is becoming too large, but i cannot also increase the number of subscribers because the dependent micro service ( event-aggregator ) is also lagging.
Now the question is, If keep sending the messages to events queue, it is just bloating the queue.
https://www.rabbitmq.com/memory.html - While reading this page, i found out that rabbitmq won't even accept the connection if it reaches high watermark fraction (default is 40%). Of course this can be changed, but this requires manual intervention.
So if the queue length increases it affects the rabbitmq memory, that is reason i thought of throttling at producer level.
Questions- How can i throttle my cron worker to skip that particular run or somehow inspect the queue and identify it already being heavily loaded so don't push the messages ?
- How can i handle the use cases i said above ? Is there design which solves my problem ? Is anyone faced the same issue ?
Thanks in advance.
AnswerCheck the accepted answer Comments for the throttling using queueCount
...ANSWER
Answered 2022-Feb-21 at 04:45You can combine QoS - (Quality of service) and Manual ACK to get around this problem. Your exact scenario is documented in https://www.rabbitmq.com/tutorials/tutorial-two-python.html. This example is for python, you can refer other examples as well.
Let says you have 1 publisher and 5 worker scripts. Lets say these read from the same queue. Each worker script takes 1 min to process a message. You can set QoS at channel level. If you set it to 1, then in this case each worker script will be allocated only 1 message. So we are processing 5 messages at a time. No new messages will be delivered until one of the 5 worker scripts does a MANUAL ACK.
If you want to increase the throughput of message processing, you can increase the worker nodes count.
The idea of updating the tables based on message status is not a good option, DB polling is the main reason that system uses queues and it would cause a scaling issue. At one point you have to update the tables and you would bottleneck because of locking and isolations levels.
QUESTION
I'm doing this on esp8266 with micro python and there is a way to clear OLED display in Arduino but I don't know how to clear display in micropython i used ssd1306 library to control my OLED
and this is my error I've written a code that prints on OLED from a list loop, but OLED prints it on the text that was printed before it (print one on top of the other not clear and printing) 7
...ANSWER
Answered 2022-Jan-10 at 17:36The fill() method is used to clean the OLED screen:
QUESTION
Ok, I'm totally lost on deadlock issue. I just don't know how to solve this.
I have these three tables (I have removed not important columns):
...ANSWER
Answered 2021-Dec-26 at 12:54You are better off avoiding serializable isolation level. The way the serializable guarantee is provided is often deadlock prone.
If you can't alter your stored procs to use more targeted locking hints that guarantee the results you require at a lesser isolation level then you can prevent this particular deadlock scenario shown by ensuring that all locks are taken out on ServiceChange first before any are taken out on ServiceChangeParameter.
One way of doing this would be to introduce a table variable in spGetManageServicesRequest and materialize the results of
QUESTION
I'm using an SMS sending service provided by a local mobile carrier. The carrier enforces clients to connect to their datacentre over a VPN in order to reach their endpoints. The VPN tunnel must always be kept open (i.e. not on demand).
Currently, I'm using a micro EC2 instance that acts as middleware between my main production server (also an EC2 instance) and the carrier endpoint.
Production Server --> My SMS Server --over VPN--> Carrier SMS Server
Is there a way to replace my middleware server with an AWS Lambda function that sends HTTP requests to the carrier over an always-on VPN tunnel?
Also, can an AWS Lambda function maintain a static IP? The carrier has to place my IP in their whitelist before I can use their service.
...ANSWER
Answered 2021-Dec-16 at 21:30s2svpn would be great but my question is can a lambda function HTTP request route through that connection?
Sure. Lambdas can have a VPC subnet attached. It's a matter of configuring the subnet routing table / VPN configuration to route the traffic to the carrier through the VPN endpoint.
Also, can an AWS Lambda function maintain a static IP?
No. Depends. A VPC-attached Lambda will create an eni (network interface) in the subnet with internal (not fixed) subnet iP address. But the traffic can be routed though a fixed NAT or a VPN gateway.
That's the reason I asked which IP address needs to be fixed, on what level. The VPN has a fixed IP address. If the carrier enforces the VPN address whitelisting, lambda clients should be working. If a fixed IP of the internal network is required then you will need a fixed network interface (e.g. using EC2)
QUESTION
I'm building a Visual Studio extension, which should add my tool button on a ToolBar or ToolStrip.
There are 2 cases:
first case, add my red button to the toolbar/toolstrip which was added by another extension (Visual Micro), see image 1.
second case, add my red button to the Properties toolbar/toolstrip of the Visual Studio UI, see image 2.
Image 1:
Image 2:
I tried to implement the second case, but without any positive results.
Here is the code:
...ANSWER
Answered 2021-Dec-16 at 17:09There aren't any toolbar or toolstrip HWNDs in WPF windows. What you are trying to do is not possible. If you need to add any visuals to Visual Studio's GUI, use the public API. This isn't just better, it's the only way to do this.
QUESTION
I have tried speeding up a toy GEMM implementation. I deal with blocks of 32x32 doubles for which I need an optimized MM kernel. I have access to AVX2 and FMA.
I have two codes (in ASM, I apologies for the crudeness of the formatting) defined below, one is making use of AVX2 features, the other uses FMA.
Without going into micro benchmarks, I would like to try to develop an understanding (theoretical) of why the AVX2 implementation is 1.11x faster than the FMA version. And possibly how to improve both versions.
The codes below are for a 3000x3000 MM of doubles and the kernels are implemented using the classical, naive MM with an interchanged deepest loop. I'm using a Ryzen 3700x/Zen 2 as development CPU.
I have not tried unrolling aggressively, in fear that the CPU might run out of physical registers.
AVX2 32x32 MM kernel:
...ANSWER
Answered 2021-Dec-13 at 21:36Zen2 has 3 cycle latency for vaddpd, 5 cycle latency for vfma...pd. (https://uops.info/).
Your code with 8 accumulators has enough ILP that you'd expect close to two FMA per clock, about 8 per 5 clocks (if there aren't other bottlenecks) which is a bit less than the 10/5 theoretical max.
vaddpd and vmulpd actually run on different ports on Zen2 (unlike Intel), port FP2/3 and FP0/1 respectively, so it can in theory sustain 2/clock vaddpd and vmulpd. Since the latency of the loop-carried dependency is shorter, 8 accumulators are enough to hide the vaddpd latency if scheduling doesn't let one dep chain get behind. (But at least multiplies aren't stealing cycles from it.)
Zen2's front-end is 5 instructions wide (or 6 uops if there are any multi-uop instructions), and it can decode memory-source instructions as a single uop. So it might well be doing 2/clock each multiply and add with the non-FMA version.
If you can unroll by 10 or 12, that might hide enough FMA latency and make it equal to the non-FMA version, but with less power consumption and more SMT-friendly to code running on the other logical core. (10 = 5 x 2 would be just barely enough, which means any scheduling imperfections lose progress on a dep chain which is on the critical path. See Why does mulss take only 3 cycles on Haswell, different from Agner's instruction tables? (Unrolling FP loops with multiple accumulators) for some testing on Intel.)
(By comparison, Intel Skylake runs vaddpd/vmulpd on the same ports with the same latency as vfma...pd, all with 4c latency, 0.5c throughput.)
I didn't look at your code super carefully, but 10 YMM vectors might be a tradeoff between touching two pairs of cache lines vs. touching 5 total lines, which might be worse if a spatial prefetcher tries to complete an aligned pair. Or might be fine. 12 YMM vectors would be three pairs, which should be fine.
Depending on matrix size, out-of-order exec may be able to overlap inner loop dep chains between separate iterations of the outer loop, especially if the loop exit condition can execute sooner and resolve the mispredict (if there is one) while FP work is still in flight. That's an advantage to having fewer total uops for the same work, favouring FMA.
QUESTION
I'm using godbolt to get assembly of the following program:
...ANSWER
Answered 2021-Dec-13 at 06:33You can see the cost of instructions on most mainstream architecture here and there. Based on that and assuming you use for example an Intel Skylake processor, you can see that one 32-bit imul instruction can be computed per cycle but with a latency of 3 cycles. In the optimized code, 2 lea instructions (which are very cheap) can be executed per cycle with a 1 cycle latency. The same thing apply for the sal instruction (2 per cycle and 1 cycle of latency).
This means that the optimized version can be executed with only 2 cycle of latency while the first one takes 3 cycle of latency (not taking into account load/store instructions that are the same). Moreover, the second version can be better pipelined since the two instructions can be executed for two different input data in parallel thanks to a superscalar out-of-order execution. Note that two loads can be executed in parallel too although only one store can be executed in parallel per cycle. This means that the execution is bounded by the throughput of store instructions. Overall, only 1 value can only computed per cycle. AFAIK, recent Intel Icelake processors can do two stores in parallel like new AMD Ryzen processors. The second one is expected to be as fast or possibly faster on the chosen use-case (Intel Skylake processors). It should be significantly faster on very recent x86-64 processors.
Note that the lea instruction is very fast because the multiply-add is done on a dedicated CPU unit (hard-wired shifters) and it only supports some specific constant for the multiplication (supported factors are 1, 2, 4 and 8, which mean that lea can be used to multiply an integer by the constants 2, 3, 4, 5, 8 and 9). This is why lea is faster than imul/mul.
I can reproduce the slower execution with -O2 using GCC 11.2 (on Linux with a i5-9600KF processor).
The main source of source of slowdown comes from the higher number of micro-operations (uops) to be executed in the -O2 version certainly combined with the saturation of some execution ports certainly due to a bad micro-operation scheduling.
Here is the assembly of the loop with -Os:
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