Envoy lua require. (string, REQUIRED) The Lua code that Envoy will execute.

Envoy lua require But, when I try to do it with an EnvoyFilter using lua it doesn't work. After signing up for a Moesif account, your Moesif Application Id will be displayed during the onboarding steps. apiVersion: networking. yaml file. As I said already, this issue tracks a different feature Title: Don't require pseudo-headers in Lua requests handler httpCall Description: Related to this issue for my situation, I'm trying to use the Lua httpCall function to contact various GCP services during certain requests Envoy handles. lua: a: a b: b route: cluster_header: "upstream-cluster" As per Istio documentation (Istio / Envoy Filter) , we have implemented example 2 , to intercept all HTTP calls and inject with Lua code to call an external service. In your envoy. If execution of the Lua script results in failure, the default_cluster will be used. jwt_authn fields: jwt_payload. What do you think? Thanks. Envoy will suspend execution of the script as appropriate and resume it when async tasks are complete. 3. LuaJIT is used as the runtime. ##### # Envoy External Authorization filter that will query OPA. Previously, the returned data was string. Adding custom response headers using Istio's (1. 4. Please see the Bazel docs for more information. io/v1alpha3 kind: EnvoyFilter metadata: name: hello_world spec: workloadLabels: filters: - listenerMatch: listenerType: SIDECAR_INBOUND So lua-resty-ffi may have different multiple instances in each lua vm instance. But luarocks require Lua, so it must be installed. I need to verify that a custom header is provided with a correct value. Reload to refresh your session. 1. What I need to change in this config file to export the lua code to external file which will be located in /envoy/lua/scripts/ folder on my ubuntu server ? The Lua Envoy extension enables the HTTP Lua filter in your Consul Envoy proxies, letting you run Lua scripts when requests and responses pass through Consul-generated Envoy Include the config used to configure Envoy. Route handle API @Dudesons The span has already been created by the time your lua code is executed, which is why setting the decorator header does not work. Because of this, the supported Lua version is mostly 5. [FEATURE REQUEST] Currently the solution proposed here doesn't have a generic way to inject scripts inside the istio-proxy container. In 3 and 4, the parts of Envoy that need to be changed, it would be great if the Envoy community could help with this so we can do it simultaneously. Description:. justincely justincely. ”. Envoy proxy can be configured to do the SSL termination and require a client certificate by setting the Downstream TLS Context on the listener and setting require_client_certificate to true. The design of the filter and Lua support at a high level is as follows: I would like to make http request from my lua filter to an external server. it is only working when I configure the context in GATEWAY, the envoyFilter is running in the istio-system namespace. You need to set this name value to the name of the route of the VirtualService. 0) envoy lua filter. But when I try to require the module 'json', I get the following Hi, I'm trying to filter json body in POST request. The following utilities are used in only some of the sandbox examples, and installation is therefore optional. 9. We implemented this and get an error Envoy uses OAuth2 or long-lived API_KEY for authentication into the API. Any calls made over plain HTTP will fail. Implementations. For this reason, this document proposes to support Envoy data plane extensibility options as first class citizens of Envoy Gateway. I need trouble when executing Lua script. 1 with some 5. v3. This design document introduces the EnvoyExtensionPolicy API allowing system administrators to configure traffic processing extensibility policies, based on existing Network and HTTP Envoy proxy extension points. The data filtering logic and queuing logic in my case is big When calling a GRPC service from a lua filter the returned body is always empty. 0. An optional boolean argument always_wrap_body can be used to require Envoy always returns a body object even if the body is empty. Lua Overview . require 'lib. This can be a very small script that further loads code from disk if desired. use_apple_api_for_dns_lookups is on by default. The default is 8001; it should almost never need changing. Envoy Gateway already provides two methods of control plane extensibility that can be used to The Lua script defined in source_code will be executed to select the routed cluster. Can you describe what you can do? It's possible that sendlocalReply() "works" but that's likely accidental for your use case. A These approaches require a high level of Envoy and Envoy Gateway expertise and may create a significant operational burden for users (see Alternatives for more details). Random42. I am new in this field. Contribute to dio/envoy-lua-test development by creating an account on GitHub. stat_prefix Optional additional prefix to use when emitting statisticsBy default metrics are emitted in . In this Saved searches Use saved searches to filter your results more quickly As per my understanding we need to register the host as cluster so that envoy understand where to send the request and I have added a value in "clusters" section of my filter. The following script Hello Envoy team I'm planning to deploy Envoy for service-a, which doesn't have any built-in authorization. The NewRelic APM tool will then read this value when the application SDK runs (e. Description: I want to remove all headers if response code is 204 to reduce traffic costs but I can remove only x-envoy-upstream-service-time and location headers on response. In this example, we show how the Lua cluster specifier can be used with the Envoy proxy. answered Dec -- Code the inspects the JSON-turned-Lua data using type() can run into troubles because what used to -- be a number can now be a table (e. Add a comment | Your Answer Reminder: Answers generated by artificial Saved searches Use saved searches to filter your results more quickly As far as I can tell (I haven’t done this), you’ll need to compile a custom version of envoy. The example Envoy proxy configuration includes a Lua cluster specifier plugin that contains a function: Saved searches Use saved searches to filter your results more quickly Step 5: Done. ; Rider is started from an internal project at Netease. The current Envoy Lua plugin does not expose request info like upstream peer server or downstream peer client IP addresses. lua. PHP start to serve the request) and compare it to the current time, thus having a time dns: envoy. You signed out in another tab or window. When the burst happens, our configuration seems overwhelmed with the number of requests and start to send lua-resty-ffi provides an efficient and generic API to do hybrid programming in openresty/envoy with mainstream languages (Go, Python, Java, Rust, Nodejs, etc. I'm currently having some issues with Istio-EnvoyFilter. http. Your Moesif Application Id can be found in the Moesif Portal. 0 Saved searches Use saved searches to filter your results more quickly I've walked through Envoy docs and found dynamic forward proxy and Lua filter might be helpful, but still wanna know how will Envoy support fetch value from host/header and dynamically define as a variable? Any suggestion is appreciated. Please check the sample yaml below if this fits your I am running Istio 1. When using an envoy. If not, I want deny access to the service and produce a 401 with a message. Ahh. In the evnoy lua filter, we get a wrapper handle from the entry function, such as envoy_on_request, It stands for the filter in lua realm. Create an API user Before you can make a call to the API, you need to set up an API user account. The logic of the Lua code is quite To test running Lua script on Envoy. Follow answered May 1, 2021 at 20:11. THANKS!!! – Paul Gilmore. I am having quite a bit of difficulty understanding how im looking to replace some login logic in on kong, for permission checks on a specific url (like upstream) to an envoy filter in istio. lua script that has envoy's on request and on response method signatures. Let’s assume two configurations of the filter. You switched accounts on another tab or window. Use the Lua plug-in to process and forward network requests,Microservices Engine:Lua is a lightweight and highly efficient scripting language. Hello, first of all thank you very much for your open source project Envoy. jwt_authn. lua_scripts allows defining a custom Lua script to run on every request. There is a way of deducing the "local path" of a file (more concretely, the string that was used to load the file). When Envoy initializes the Luajit VM, it can load and execute the specified Lua script for initializing Lua global variables and so on. Also you need to use a typed_per_filter_config with a type LuaPerRoute. Config: Title: Lua filter failing to set DynamicMetaData Description: I am trying to setup a redirect if jwt auth fails with Lua functions, and I need the original URI to pass as a callback after authentication. e. 1,070 8 8 silver Control4 Driver for Enphase Envoy. ; Kong: the SDK API style is from OpenResty and Kong's PDK. We can have Lua support, and have it be not supported by the Contour team, but we would need to validate that sending a broken Lua to Envoy doesn't produce an xDS NACK, because that has bad consequences. co. envoy filter to intercept upstream response. Requirements. curl. Using a value of 0 or 1 ensures\n-- that all JSON numeric data becomes strings in Lua. API Authentication Guides OAuth password grant OAuth client credentials Scopes Scopes contro EnvoyExtensionPolicy. AssemblyScript Title: How do we log LUA exceptions? Description: I'm using Envoy 1. 2 features. Call. Learn more about how our API authentication works. To use the ambassador Module to configure Emissary, it I have some dynamicMetadata set key: envoy. However, I don't see my proxy getting properly configured. How to apply I am using envoy proxy in my application and I am trying to print logs in these three ways: In fixed ORDERING JSON format; Need to add request and response body of the request to log; Can we add a route level logging (enable/disabling), not with Lua? All below scenarios log level is added in listener filter in my application. function envoy_on_request(request_handle) -- Make an HTTP call to an upstream host with the following headers, body, and timeout. It can also select a cluster based on matched request headers. For example if the Pod has multiple access paths like /foo and /bar, denies access to /foo and responds with status 500, but allows access to /bar. ; Is the same HTTP filter class allowed to be configured multiple times in http_filters? Lua: low: stable: High: no need to compile, deploy directly: WASM: high-medium: on the fence: depends on language: At the same time, we hope that we could work with the Envoy community in the direction of Lua Filter, optimize and improve Lua Filter, enhance the expansion capabilities of Envoy, and reduce the difficulty of Envoy expansion. io/v1alpha3 kind: EnvoyFilter metadata: name: auth-forward-filter namespace: istio-system spec: workloadSelector: # select by label in the The lua script in the yaml, maps current customer-id and logged-in fields to user-id and is-authenticated fields. Envoy is a largely extensible tool. Lua Http Filter. The latest and widely implemented version of the specification is v0. This is useful for simple use cases that mutate requests or responses, for example to add a custom header: For more details on the Lua API, see the Envoy Lua filter documentation. lua' ONLY. io/v1alpha3 kind: EnvoyFilter metadata: name: ext-authz Saved searches Use saved searches to filter your results more quickly The Lua script defined in source_code will be executed to select the routed cluster. Feature - add support for envoy lua http filters #1677. This information is not currently available via the Lua API, but it does exist in C++ as stored in the StreamInfo class. 6. Our Envoy setup has a Lua HTTP filter that does an httpCall to an external API (bot detection) to block or not the incoming request before reaching the origin. In fact, it is super easy with RequestAuthentication and AuthorizationPolicy objects, rather then envoyFilter Also, I am not sure if the value under patch can be envoy. memory: switched to the new tcmalloc for linux_x86_64 builds. The only way would be to get hold of the current span, and then call the setOperation method - but I am not familiar with the lua filter so don't know how to get hold of the span from there. Apply the Envoy Filter at the Ingress Gateway Level and use the LUA script to verify the response from the Authentication server (The Envoyfilter YAML with Lua Script is given above) Hit some backend service routed through the ingress gateway. In this demo, the responses that are served by the deployed services are stored in responses. Update these At AutoTrader, we've got a large (400+) microservice architecture, and many requests to autotrader. The header’s value comes from API. and why we need a new lua cluster specifier plugin instead of lua HTTP filter Setup your sandbox environment with Docker and Docker Compose, and clone the Envoy repository with Git. Unfortunately, the Envoy docs state the following: The headers and body of the original request will be sent in Envoy LUA and wasm filters that enforce very basic Certificate Bound Tokens. Essentially I need a setup that will call an ExtAuthz in order to authenticate, and also retrieve the header x-auth-request-email and rename it to kubeflow-userid. Contribute to warmenhoven/envoy-c4z development by creating an account on GitHub. usr The below produces the following logs function envoy_on_request(request_handle) local meta = request_handle -- Code the inspects the JSON-turned-Lua data using type() can run into troubles because what used to -- be a number can now be a table (e. If I try the same code that I'm posting here, but without HTTPS, Saved searches Use saved searches to filter your results more quickly When using an envoy. Improve this answer. E. g. namespace. YAML configuration may be easier to read since YAML supports multi-line strings so complex scripts can be easily expressed inline in the configuration. Saved searches Use saved searches to filter your results more quickly You need to apply an EnvoyFilter in your kubernetes cluster and in the lua code, you can log the request body. Remember, those consequences look like this from a user perspective: Multiple users are using Contour, everything is great. as the small/big/precise example above shows). Update these Envoy recently added support to inject filters via lua scripts. uk could traverse 10+ services in order to build the response. com envoyproxy/envoy/blob Cloud-native high-performance edge/middle/service proxy - envoyproxy/envoy How to make a lua envoy filter work on the istio cluster? 3. See the LuaJIT documentation for more details. You signed in with another tab or window. curl . To start my journey Virtual service focuses only on rewriting and routing including headers and it doesnt support denying traffic without the header. So I was trying to use lua envoyfilter to achieve that. Commented Nov 16, 2017 at 0:51. NOTE 3: *_To apply an EnvoyFilter resource to all workloads (sidecars and gateways) in the system, define the resource in the config root namespace, without a workloadSelector. If you see the docs:. In the configuration below I added a Lua Overview . Follow edited May 28, 2020 at 11:13. Used to make HTTP requests. Explore Teams Contents Envoy General gRPC Header behavior Observability Protocols Security Service health / timeouts Traffic management If present, the ambassador Module defines system-wide configuration for Emissary. Please help me. simple envoy filter not being used. filters. We can use the httpCall() function to communicate with an external service. So lua-resty-ffi may have different multiple instances in each lua vm instance. Also keep in mind that 'The filter should be configured with the name envoy. Aside from the log methods available I haven't been able to find a way to capture the lua exceptions and Background We are developing a Lua framework that support Apache APISIX plugins run directly in Envoy Lua filter without modify Envoy. However Upon checking EnvoyFilter it can manipulate deny requests based on header condition. Logs: Include the access logs and the Envoy logs. The basic idea behind bound tokens is that the signed bearer token itself has information embedded within it which defines the transport/TLS client certificate that is presented. Thanks. In order to access the downstream request header via request_handle, you will need to use the header() method as follow: request_handle:headers(). I'm trying to diagnose issues when running the LUA filter. Envoy will be configured with the necessary data (KEYCLOAK_URL, KEYCLO I am developing a framework that support Apache APISIX plugins run directly in Envoy Lua filter without modify Envoy. lua http filter, is there a way to parse the json body response of a request executed from within the envoy_on_request function: local headers, body = request_handle:httpCall Thanks Does each request create an instance per HTTP filter configured in the http_filters? That is, for each request, the connection manager will create a C++ object of Envoy::Extensions::HttpFilters::Lua::Filter class (if it's configured in http_filters). All network/async processing is performed by Envoy via a set of APIs. Envoy With Lua. Copy validated JWT claims to HTTP request headers example . We also need to configure the cluster to which Envoy Proxy will forward requests. ; Envoy Lua filter and Wasm filter: Rider HTTP filter is modified from Envoy Lua filter and the design refers to the Wasm filter. 3. Route handle API You signed in with another tab or window. When I test statically it works. While this is great, there are certain circumstances where we need some additional customizations so Envoy scratches this itch by providing options like Lua Filter, Wasm Filter or the ExtProc Filter. Lua Docs. post(), schedules a closure to be executed in the envoy main thread, and resumes the Lua coroutine there. , turning a response into headers only, adding trailers, changing/removing body, etc. it works in these 2 steps : add the payload from JWT to a variable jwt_payload . It turns out that this is easy to accomplish with Envoy Proxy. bar' Above config uses more complex group requirements:. You can use that as a reference, just note they may not be 100% up to date. Call Stack: If (required, string) The Lua code that Envoy will execute. THANKS! – Paul Gilmore. bar, you might be doing something like this:. Route handle API Additional dependencies . envoy. When the headers of an incoming request get parsed by envoy, an HTTP filter’s decodeHeaders() is called. The following example enables Envoy’s Lua filter for all inbound HTTP calls arriving at service port 8080 of those service pods which listens on it with labels “authorization-<namespace i was able to acheive the above by adddding a lua filter and writing a lua script to validate token claims. Instructions for installing curl on many platforms and operating systems can be found on the curl website. . The front Envoy is configured to run the Cache Filter, which stores cacheable responses in an in-memory cache, and serves it to subsequent requests. envsubst Cloud-native high-performance edge/middle/service proxy - envoyproxy/envoy Saved searches Use saved searches to filter your results more quickly By default Envoy is built without exporting symbols that you may need when interacting with Lua modules installed as shared objects. Only thing I can think of is that you defined your EnvoyFilter in the config root namespace and it's ignoring workloadSelector. We just need to change the post function in resty_ffi. Being able to visualise that as a trace has been on of the Saved searches Use saved searches to filter your results more quickly Title: Can't remove server, date and content-length headers via Lua script. Saved searches Use saved searches to filter your results more quickly Scarlet Witch. Here's the problem contextualization: I create a default. Description: In an attempt to shadow an upstream response using a Lua filter, I use envoy_on_response() to collect the response data using either body() or bodyChunks(), then use httpCall() to send the data to a special logging cluster. Digging into this I think its related to the response handling code that copies the c++ string to a c string as the body of the http request starts with a null char because the grpc wire format is uncompressed. In general, use_remote_address should be set to true when Envoy is deployed as an edge node (aka a front proxy), whereas it may need to be set to false when Envoy is used as an internal service node in a mesh deployment. Share. Thanks! Context. (string, REQUIRED) The Lua code that Envoy will execute. 5. \n--\n-- The Lua script defined in source_code will be executed to select the routed cluster. ISSUE The request to the Authentication server setup outside the cluster always returns a 403 error I would like to use EnvoyFilter in Istio to specify behavior for specific routes or paths. In Istio, you usually use How to make a lua envoy filter work on the istio cluster? 3. Note that we Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I am running Istio 1. Setup your sandbox environment with Docker and Docker Compose, and clone the Envoy repository with Git. yaml configuration with the URL of the main application. But the wrapper is userdata type, and the address of the I'm trying to use a lua HTTP filter to set a response header whose value depends on a request header. Envoy offers a lot of variety in HTTP filters and you can do a lot with what comes out of the box like Header Mutation filter or gRPC-HTTP Transcoding. io/v1alpha3 kind: EnvoyFilter metadata: name: lua-filter I need to decrypt the body of a request in an external API. If decodeHeaders() returns StopIteration, Title: Lua support cluster specifier extension Description: Lua support cluster specifier plugin extension to enable selecting cluster dynamically by lua code. The only way we found is to set use_remote_address to true for http_connection_manager so that but the time lua plugin is invoked x-envoy-external-address is set, if the client is not considered internal. The design of the filter and Lua support at a high level is as follows: You signed in with another tab or window. Istio - How to add custom label-based metrics? 1. 18. found it. Note: If there are privacy concerns, sanitize the data prior to sharing. #13307 Goals Implementing the uri blocker plugin running on envoy. SDKs. Specifically by making use of the External Authorization HTTP Filters. The first rule specifies requires_any; if any of provider1 or provider2 requirement is satisfied, the request is OK to proceed. 4 minute read . Envoy buid and link luajit staticly. I’ve got a Envoy Filter in which I add a header to every HTTP request. YAML configuration may be easier to read since YAML supports multi-line strings so complex scripts can be easily expressed inline in The worker coroutine responds to the Lua coroutine through envoy dispatcher. If no per route config is provided for the request, this Lua code will be applied. It's possible to configure the HTTP Hi, I'm trying to implement simple basic auth using LUA, and I want to activate the filter on selected routes. If a JWT is Saved searches Use saved searches to filter your results more quickly If you wish to overwrite an existing header, you need to specify the header in the corresponding extension file with the same key and set append to false. That is, information provided within a presented client cert during mTLS with a resource server will be used to cross validate . Commented Nov 16, 2017 at 0:33. Filter request logs in the istio sidecar proxy. io/v1alpha3 kind: EnvoyFilter voyproxy#35104) Commit Message: add option to put backpressure when Lua script executes httpCall Additional Description: PR addresses a situation when upon receiving request headers, Lua script issues httpCall and backpressure should be put on the downstream client to slow down sending body, which size may exceed maximum allowed buffer size per I am running Istio 1. (I'm no envoy nor lua expert so bare with me please): apiVersion: networking. I can confirm renaming LUA_PATH to LUA_EXE_PATH fixed my issue. It would be great to configure and add these filters via pilot. lua: changed the response body returned by httpCall() API to raw data. If you are building an app for other Envoy customers please refer to this guide for retrieving an access token. Below we tried to share the relevant information and if you need anything from us, let us know. Follow answered Aug 19, 2020 at 17:46. Complete example A complete example using Docker is available in the Lua cluster specifier sandbox. yaml-listener_name: frontend header: key: my-header value: header-value LUA Scripts Envoy docs: LUA filter. This flag only affects Apple platforms (macOS, iOS). Many of the examples use the curl utility to make HTTP requests. Note that if JSON configuration is used, the code must be properly escaped. How can I decode JSON request body in Envoy with Lua? Where is m I am trying to figure out out to contruct an EnvoyFilter (using v3 API) to be used in conjunction with Istio and OAuth2-Proxy (as external Authz service). 0. According to Envoy documentation, http call can be done using request_handle:httpCall:. Overview. Let's assume two configurations of the envoy filter. istio. 14. This file is mounted to both services’ containers, so any changes made to the stored responses while the services are running Ask questions, find answers and collaborate at work with Stack Overflow for Teams. - kingluo/lua-resty-ffi Main: This thread owns server startup and shutdown, all xDS API handling (including DNS, health checking, and general cluster management), runtime, stat flushing, admin, and general process management (signals, hot restart, etc. The envoy filter config that I’m trying to use is kind: EnvoyFilter metadata: name: lua-filter namespace: istio-system spec: I am trying to implement lua filter to communicate with OPA ( open policy agent ) [ other authorization server has some issue , not working ], hence trying to implement lua filter. The key, is actually the value to the keys (the one starting with {e:). The header's value comes from an external API. In Envoy, both lua-resty-ffi (envoy porting) and the built-in golang filter allow you to use golang to develop asynchronous business logic through goroutine, but which one performs better?. I wanted to add some custom headers to all the outbound responses originating from my service. It was checked in the logs of my target application and it works. ##### This is not an issue but a question. Everything that happens on this thread is asynchronous and “non-blocking. If multiple lua filters are configured in a filter chain, the stats from each filter instance can be emitted using custom stat prefix to distinguish So, I think it should require one of inline_code and source_codes, but not just require inline_code. See the note on lua rocks here: github. lua envoyFilter ignored in istio-sidecar. Sorry there isn't a more consolidated location, hope this helps. Update the envoy. All API requests must be made over HTTPS. ##### apiVersion: networking. Users will need to build dwp file to debug with gdb. I am able to configure lua filter to communicate with OP I'm currently using Envoy's internal redirects feature to handle a redirect coming from an upstream service. In gateway development, Lua can be used to write and execute various gateway programs, such as API gateways, message gateways, and reverse (required, string) The Lua code that Envoy will execute. Follow answered Feb 23, 2024 at 4:57. I need to use httpCall() to request an external service for data validation, so I need to parse the body of request and response through json. [optional Relevant Links:] Any extra documentation required to understand the issue. Thank you. Inbound Istio Ingress Gateway Metrics. Through uri blocking rules configur If we need to make a call to another service from within Lua, we need to use an Envoy-provided function to do this (we should not use a general-purpose Lua library to make rpc calls because we want Envoy to manage the call correctly with its non-blocking threading architecture). I need to rename the variable. ; The default script requires other files from a given path @qiannawang you should be able to do what you are looking for with the existing filter interface. Note that the metadata should be specified under the filter name i. This code works for me for example: apiVersion: networking. Answer provided by @jh-sz. If your VirtualService looks something like that:. So what I did, was to get the Cookie header using I agree with larsitto that you have probably problem with workloadLabels - try to leave it empty or specify some label that you specify in your deployment>spec>template>labels[]. metadata: Hi all, I’m using istio 1. However, if there is a need to change the path during forwarding, we have to use prefix_rewrite or regex_rewrite. Worker: By default, Envoy spawns a worker thread for every hardware Also, there is no need to update the path, by default envoy will forward the request to the same path that was requested. ️ This guide only applies to private apps that you plan to use only for your company. LUA) can only be attached to HTTP/GRPC Routes. yaml. It will send requests without authorization through Envoy. And the most important part, just omit context field, when matching your configPatches, so that this applies to both sidecars and Trying to implement lua filter with OPA [ open policy agent and istio ] to implement a simple poc, i have created following following filter. 2. Envoy may need to be built with support for exported symbols. The redirect response includes HTTP headers that I would like to include in the subsequent request that Envoy sends when it follows said redirects. Call flow. Lua scripts. The HTTP Lua filter allows Lua scripts to be run during both the request and response flows. I did not realize this would change the behavior of lua. If you are requiring a file inside lib. Below is an example of a metadata in a route entry. 6. httpCall. But it seems that I can't get to make per_filter_config on route configuration work. routes: - match: prefix: "/" metadata: filter_metadata: envoy. When I print request:body type return userdata type. DataSource) The default Lua code that Envoy will execute. yaml, add a http_filters section along with the below code snippet. Therefore we can modify the body regardless of whether the original body exists or not. lua http filter, is there a way to parse the json body response of a request executed from within the envoy_on_request function: local headers, body = request_handle:httpCall Thanks I've achieved something similar using a combination of meta-data and the Lua filter. Then you can chain get(<header name>), add(<header name>, <value>), remove()`. Sandbox environment. io/v1alpha3 kind: EnvoyFilter metadata: name: authorization-filter namespace: default spec: filters: - listenerMatch: listenerType: I have a custom header that is marshaled with protobuf (in a lua script inside an openresty plugin), called x-internal-state-bin. io/v1alpha3 kind: EnvoyFilter metadata: name: custom-filter namespace: dev spec: workloadSelector: labels Your jwt key is formatted for RequestAuthentication object, not envoy. 0 commit: 48fefd43444d2f8852f527c78f0141b377b1e42a` Kubernetes version is 1. As per documentation, for calling ext services requires a cluster definition in envoy. restart_features. Specification. Add your tag values and associated cluster as meta-data to your route and use the cluster_header option to provide the cluster name to route to: . ). 1 on minikube. If multiple lua filters are configured in a filter chain, the stats from each filter instance can be The design of Rider comes from these awesome projects: OpenResty: we learn from its source code about the implementation of FFI binding. We extended custom LUA script to call an external service . You won’t need it unless you need to change one of the system-wide configuration settings below. 5,603 3 3 gold badges 22 22 silver badges 42 42 bronze badges. The Lua script itself registers itself onto the envoy_on_response event which means the filter is only invoked for outgoing traffic and not incoming requests. That's correct! You should apply your EnvoyFilter in the config root namespace istio-system- in your case. default_source_code (config. We encountered a scenario where it was necessary to parse specific data, such as the OrderNumber, from both the request and response @mattklein123 the value should be when envoy starts sending the request to a cluster backend, so when the request leaves envoy and goes to the network for an application backend server. If any of the claim changes, I only need the update Istio Envoy Filter Lua filter . The second rule specifies requires_all; only if both provider1 and provider2 requirements are satisfied, the request is OK to proceed. As a simple example, suppose we want to copy a header from the request to the response. Thanks Chris, I get the idea how to approach the solution. 431 1 1 gold badge 4 4 silver badges 9 9 This article explores the possibility of using a Lua HTTP filter in an Istio Envoy filter to log the time taken for requests and possibly integrate with Prometheus metrics service. 2. The author is using Envoy filters to read requests and make decisions, and is interested in logging the time taken for these requests. But didn't work with request body. io/v1beta1 kind: VirtualService metadata: name: reviews-route I've got an Envoy Filter in which I add a header to every HTTP request. For The event-driven streaming APIs and convenient utility functions were originally developed for the WebAssembly in Envoy project, but they are proxy-agnostic, and consumers can use the same Proxy-Wasm extensions across different proxies. How can 2. You cannot call native code as Envoy, by default, does not export the symbols required by Lua modules written in C. Now I want to have access to this header in an inline lua code on my envoy, how can I unmarshal this custom proto (I have the proto file)? Or if there are other solutions with other filters than lua. It is critical for performance that Envoy APIs are used Lua filter Requirements. If necessary, either use FF I or compile your Envoy with the Lua symbols By default metrics are emitted in . A user Description:. Service Discovery with Envoy. I use the envoyproxy/envoy-alpine:latest container. Here the is Lua filter config: - As we've to run Envoy Proxy as a separate application on Code Engine, let's create a container image with a configuration file baked into the image. Title: Lua filter: httpCall() terminates abruptly in envoy_on_response() when used after bodyChunks(). minikube version: v1. My code is as follows： apiVersion: networking. Sharing also this link where one of the comments uses EnvoyFilter to manipulate header rules. 9,159 6 6 gold badges 58 58 silver badges 87 87 bronze badges. Chris Chris. As previously discussed with @dio in Slack: we would like to access timing information for the current request and response from the Lua filter. Istio EnvoyFilter that checks header for a valid token. foo. The context in envoy_on_request and envoy_on_response are the same table object. Update Envoy config. The use of Prometheus metrics services is mentioned, and the length, so it's converted not to a Lua integer but to a Lua string. Closed nmnellis opened this issue Nov 11, 2017 · 14 comments Closed Additionally we need a separate webhook for v2, to do other things. I have written a simple patch that exposes the information, but its use in practice is not There are 2 answers with that in above github issue. 1. In the configuration below I added a hardcoded version of my header. Do not perform blocking operations from scripts. However, I don’t see my proxy getting properly configured. Note that if JSON configuration is used, the code must be I am trying to implement lua script into an evnoy configuration file What I want is to write my lua code within a local lua file and then scpecify my script file inside the envoy configuration file The problem is your todo #TODO: Understand name compose logic. #8768 Note that you need to handle timeouts of the queue somehow. Raheel Raheel. Envoy proxy is very powerful and Lua makes it easy to do some heavy lifting without much effort. Header configuration example: <request|response>-headers. #13307 But in the process, I found that some header values, such as client IP and custom headers, cannot be get in Lua Some of Envoy's other open projects that need to reference these types frequently hold definitions of well known types. If you have any questions about this or want to discuss any related topics, join our Hello： When using Lua to extend evoyfilter for development, we need to use the third-party library cjson. core. ssgoc knxhbzd kdcvm sydtybf tvai bdqm vjbk tbe rswe umrs