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andersh
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fix: refactor to support multiple providers
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Lines changed: 1146 additions & 161 deletions

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‎.gitignore‎

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/web_proxy_cache
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*.bin
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# Vendor directory (if not using Go modules)
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vendor/
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# Go workspace file
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go.work
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go.work.sum
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# Dependency directories (Go modules)
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/go.sum
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/go.mod
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# IDE/editor files
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.idea/
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.vscode/
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*.swp
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# OS-specific files
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.DS_Store
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Thumbs.db
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# Test cache
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*.coverprofile
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*.log
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# Build and release directories
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dist/
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release/
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datasource/

‎COPYRIGHT‎

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Copyright (C) 2025 Anders Håål
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This project is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This project is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this project. If not, see <https://www.gnu.org/licenses/>.
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---
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Contributors:
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- Anders Håål <anders.haal@ingby.com>
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License:
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- This project is licensed under the GNU General Public License v3.0 (GPL-3.0-or-later).
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- See the LICENSE file for the complete text of the license.

‎LICENSE‎

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‎README.md‎

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@@ -10,55 +10,71 @@ The web_proxy_cache will also cache the result for a certain amount of time to m
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overloading the target or that the response time will take to long. It also supports additional fetch from the target if
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the data in the cache is expired but in the defined grace period.
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# License
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Licensed under GPLv3, see LICENSE for details.
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# Use case
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Typical use case is using the Infinity datasource in Grafana.
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- Using the Infinity datasource in Grafana that minimal paginating capability and no caching.
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- Service discovery in Prometheus that needs to fetch a large amount of data.
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# Supported targets
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# Supported providers
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- Netbox
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- Demo - this is just a demo provider that can be used to test the web_proxy_cache and
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work as a template for other providers.
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> Currently only Netbox is supported, but it is easy to add more targets, using a new fetcher and parser.
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> Currently, only Netbox is supported, but it is straightforward to add more targets using a new fetcher and parser.
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> If you develop a new provider that can be useful for others, please submit a PR.
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# How to use
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A call to the web_proxy_cache is done by calling the proxy in the following way, example is netbox:
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A call to the web_proxy_cache is done by calling the proxy in the following way, example is Netbox:
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```shell
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curl -H "Authorization: Token $NETBOX_TOKEN" -H "X-Forwarded-Host: https://netbox.foo.com" "localhost:8080/netbox/api/dcim/devices/?site=labs&status=active&has_primary_ip=true"
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```
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The X-Forwarded-Host is used to tell the proxy what target to use.
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The first part of the URL is the target system identity, `netbox` and the rest is the path and query to be sent to the
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- The X-Forwarded-Host is used to tell the proxy what target to use.
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- The first part of the URL is the provider identity, `netbox` and the rest is the path and query to be sent to the
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target.
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> Do not use `limit` and `offset` in the query, the proxy will handle this for you.
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> Do not use `limit` and `offset` in the query or other paging technics, this is the responsibility of the provider
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> to handle.
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# Configuration
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Every configuration is done by environment variables.
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- LIMIT - the max size of pagination, default `1000`
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- CACHE_TTL - the time to keep data in the cache, default `600` seconds
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- CACHE_GRACE - the time to after TTL where the cache will return cached data but fetch new in the background, default `300` seconds
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- CACHE_SIZE - max cache size, default `1000`
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- SERVER_ADDRESS - the port to run the proxy on, default `:8080`
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- `SERVER_ADDRESS` - the port to run the proxy on, default `:8080`
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Provider specific environment variables:
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- `<PROVIDER>_LIMIT` - the max size of pagination, default `1000`
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- `<PROVIDER>_CACHE_TTL` - the time to keep data in the cache, default `600` seconds
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- `<PROVIDER>_CACHE_GRACE` - the time to after TTL where the cache will return cached data but fetch new in the background, default `300` seconds
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- `<PROVIDER>_CACHE_SIZE` - max cache size, default `1000`
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> For any other providers the configuration is the same just replace `NETBOX` with the provider name.
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# Internal metrics
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The web_proxy_cache will expose internal metrics on the `/metrics` endpoint.
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# Caching logic
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The caching logic is based on the following principles:
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- The cache will store the result of the request for a certain amount of time, defined by `CACHE_TTL`.
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- If the request is made after the `CACHE_TTL` but within the `CACHE_GRACE`, the cache will return the cached data and
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- The cache will store the result of the request for a certain amount of time, defined by `<PROVIDER>_CACHE_TTL`.
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- If the request is made after the `<PROVIDER>_CACHE_TTL` but within the `<PROVIDER>_CACHE_GRACE`, the cache will return the cached data and
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fetch new data in the background.
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- If the request is made after the `CACHE_GRACE`, a full fetch will be done and the cache will be updated with the new data.
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- If the request is made after the `<PROVIDER>_CACHE_GRACE`, a full fetch will be done and the cache will be updated with the new data.
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- The cache will use the full URL as the key, including query parameters, to ensure that different requests are cached separately.
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- The cache will use a LRU (Least Recently Used) strategy to evict old entries when the cache size exceeds `CACHE_SIZE`.
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- The cache will use a LRU (Least Recently Used) strategy to evict old entries when the cache size exceeds `<PROVIDER>_CACHE_SIZE`.
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# Implement a new provider
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To implement a new provider, create a new fetcher and parser. The fetcher will be used to fetch the data from the target
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and the parser will be used to parse the data into a format that can be used by Grafana.
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# Service discovery
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# Netbox provider specific
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## Service discovery
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The web_proxy_cache can be used with http based service discovery in Prometheus. The service discovery can in principle
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be used for any api call for the netbox api, but the exporter is designed to work with the
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`/dcim/devices/` endpoint where the filter return a hugh amount of entries.
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To format the output for service discovery use the `X-Forwarded-For` header with the value
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`service_discovery`.
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> The reason for this implementation is that it has been observed that the netbox plugin
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> [netbox-plugin-prometheus-sd](https://github.com/FlxPeters/netbox-plugin-prometheus-sd)
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> will take a vary long time to return the result or even retrun 500 or 504 (probobly proxy timeout)
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> will take a vary long time to return the result or even return 500 or 504 (probobly proxy timeout)
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> when the number of devices is large.
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> Only use this solution if you have a large number of devices in Netbox and the netbox-plugin-prometheus-sd is not
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> working for you.

‎config.go‎

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‎config/config.go‎

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package config
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const (
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MetricsPrefix = "network_proxy_"
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)
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type ConfigProxy struct {
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ProxyLimit int `mapstructure:"proxy_limit"`
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CacheUse bool `mapstructure:"use_cache"`
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CacheTTL int64 `mapstructure:"cache_ttl"`
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CacheGrace int64 `mapstructure:"cache_grace"`
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CacheSize int `mapstructure:"cache_size"`
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//ServerAddress string `mapstructure:"server_address"`
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}

‎config/env.go‎

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package config
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import (
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"os"
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"strconv"
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"strings"
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)
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func GetEnv(key string, defaultVal string) string {
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if value, exists := os.LookupEnv(key); exists {
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return value
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}
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return defaultVal
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}
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func GetEnvAsInt(name string, defaultVal int) int {
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valueStr := GetEnv(name, "")
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if value, err := strconv.Atoi(valueStr); err == nil {
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return value
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}
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return defaultVal
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}
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func GetEnvAsInt64(name string, defaultVal int64) int64 {
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valueStr := GetEnv(name, "")
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if value, err := strconv.ParseInt(valueStr, 10, 64); err == nil {
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return value
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}
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return defaultVal
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}
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func GetEnvAsBool(name string, defaultVal bool) bool {
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valStr := GetEnv(name, "")
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if val, err := strconv.ParseBool(valStr); err == nil {
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return val
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}
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return defaultVal
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}
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func GetEnvAsSlice(name string, defaultVal []string, sep string) []string {
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valStr := GetEnv(name, "")
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if valStr == "" {
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return defaultVal
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}
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val := strings.Split(valStr, sep)
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return val
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}

‎go.mod‎

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module web_proxy_cache
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go 1.22.4
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go 1.23.0
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toolchain go1.23.1
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require (
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github.com/prometheus/client_golang v1.19.1
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github.com/prometheus/client_golang v1.23.0
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github.com/segmentio/ksuid v1.0.4
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github.com/sirupsen/logrus v1.9.3
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golang.org/x/tools v0.24.0
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golang.org/x/tools v0.36.0
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)
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require (
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github.com/beorn7/perks v1.0.1 // indirect
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github.com/cespare/xxhash/v2 v2.2.0 // indirect
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github.com/prometheus/client_model v0.5.0 // indirect
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github.com/prometheus/common v0.48.0 // indirect
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github.com/prometheus/procfs v0.12.0 // indirect
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golang.org/x/mod v0.20.0 // indirect
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golang.org/x/sync v0.8.0 // indirect
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golang.org/x/sys v0.23.0 // indirect
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google.golang.org/protobuf v1.33.0 // indirect
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github.com/cespare/xxhash/v2 v2.3.0 // indirect
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github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
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github.com/prometheus/client_model v0.6.2 // indirect
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github.com/prometheus/common v0.65.0 // indirect
20+
github.com/prometheus/procfs v0.16.1 // indirect
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golang.org/x/mod v0.27.0 // indirect
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golang.org/x/sync v0.16.0 // indirect
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golang.org/x/sys v0.35.0 // indirect
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google.golang.org/protobuf v1.36.6 // indirect
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)

‎go.sum‎

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github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
22
github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
3-
github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
4-
github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
3+
github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
4+
github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
55
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
66
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
77
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
8-
github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
9-
github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
8+
github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
9+
github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
10+
github.com/klauspost/compress v1.18.0 h1:c/Cqfb0r+Yi+JtIEq73FWXVkRonBlf0CRNYc8Zttxdo=
11+
github.com/klauspost/compress v1.18.0/go.mod h1:2Pp+KzxcywXVXMr50+X0Q/Lsb43OQHYWRCY2AiWywWQ=
12+
github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
13+
github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
14+
github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
15+
github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
1016
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
1117
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
12-
github.com/prometheus/client_golang v1.19.1 h1:wZWJDwK+NameRJuPGDhlnFgx8e8HN3XHQeLaYJFJBOE=
13-
github.com/prometheus/client_golang v1.19.1/go.mod h1:mP78NwGzrVks5S2H6ab8+ZZGJLZUq1hoULYBAYBw1Ho=
14-
github.com/prometheus/client_model v0.5.0 h1:VQw1hfvPvk3Uv6Qf29VrPF32JB6rtbgI6cYPYQjL0Qw=
15-
github.com/prometheus/client_model v0.5.0/go.mod h1:dTiFglRmd66nLR9Pv9f0mZi7B7fk5Pm3gvsjB5tr+kI=
16-
github.com/prometheus/common v0.48.0 h1:QO8U2CdOzSn1BBsmXJXduaaW+dY/5QLjfB8svtSzKKE=
17-
github.com/prometheus/common v0.48.0/go.mod h1:0/KsvlIEfPQCQ5I2iNSAWKPZziNCvRs5EC6ILDTlAPc=
18-
github.com/prometheus/procfs v0.12.0 h1:jluTpSng7V9hY0O2R9DzzJHYb2xULk9VTR1V1R/k6Bo=
19-
github.com/prometheus/procfs v0.12.0/go.mod h1:pcuDEFsWDnvcgNzo4EEweacyhjeA9Zk3cnaOZAZEfOo=
18+
github.com/prometheus/client_golang v1.23.0 h1:ust4zpdl9r4trLY/gSjlm07PuiBq2ynaXXlptpfy8Uc=
19+
github.com/prometheus/client_golang v1.23.0/go.mod h1:i/o0R9ByOnHX0McrTMTyhYvKE4haaf2mW08I+jGAjEE=
20+
github.com/prometheus/client_model v0.6.2 h1:oBsgwpGs7iVziMvrGhE53c/GrLUsZdHnqNwqPLxwZyk=
21+
github.com/prometheus/client_model v0.6.2/go.mod h1:y3m2F6Gdpfy6Ut/GBsUqTWZqCUvMVzSfMLjcu6wAwpE=
22+
github.com/prometheus/common v0.65.0 h1:QDwzd+G1twt//Kwj/Ww6E9FQq1iVMmODnILtW1t2VzE=
23+
github.com/prometheus/common v0.65.0/go.mod h1:0gZns+BLRQ3V6NdaerOhMbwwRbNh9hkGINtQAsP5GS8=
24+
github.com/prometheus/procfs v0.16.1 h1:hZ15bTNuirocR6u0JZ6BAHHmwS1p8B4P6MRqxtzMyRg=
25+
github.com/prometheus/procfs v0.16.1/go.mod h1:teAbpZRB1iIAJYREa1LsoWUXykVXA1KlTmWl8x/U+Is=
2026
github.com/segmentio/ksuid v1.0.4 h1:sBo2BdShXjmcugAMwjugoGUdUV0pcxY5mW4xKRn3v4c=
2127
github.com/segmentio/ksuid v1.0.4/go.mod h1:/XUiZBD3kVx5SmUOl55voK5yeAbBNNIed+2O73XgrPE=
2228
github.com/sirupsen/logrus v1.9.3 h1:dueUQJ1C2q9oE3F7wvmSGAaVtTmUizReu6fjN8uqzbQ=
2329
github.com/sirupsen/logrus v1.9.3/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
2430
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
25-
github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
2631
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
27-
golang.org/x/mod v0.20.0 h1:utOm6MM3R3dnawAiJgn0y+xvuYRsm1RKM/4giyfDgV0=
28-
golang.org/x/mod v0.20.0/go.mod h1:hTbmBsO62+eylJbnUtE2MGJUyE7QWk4xUqPFrRgJ+7c=
29-
golang.org/x/sync v0.8.0 h1:3NFvSEYkUoMifnESzZl15y791HH1qU2xm6eCJU5ZPXQ=
30-
golang.org/x/sync v0.8.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
32+
github.com/stretchr/testify v1.10.0 h1:Xv5erBjTwe/5IxqUQTdXv5kgmIvbHo3QQyRwhJsOfJA=
33+
github.com/stretchr/testify v1.10.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
34+
go.uber.org/goleak v1.3.0 h1:2K3zAYmnTNqV73imy9J1T3WC+gmCePx2hEGkimedGto=
35+
go.uber.org/goleak v1.3.0/go.mod h1:CoHD4mav9JJNrW/WLlf7HGZPjdw8EucARQHekz1X6bE=
36+
golang.org/x/mod v0.27.0 h1:kb+q2PyFnEADO2IEF935ehFUXlWiNjJWtRNgBLSfbxQ=
37+
golang.org/x/mod v0.27.0/go.mod h1:rWI627Fq0DEoudcK+MBkNkCe0EetEaDSwJJkCcjpazc=
38+
golang.org/x/sync v0.16.0 h1:ycBJEhp9p4vXvUZNszeOq0kGTPghopOL8q0fq3vstxw=
39+
golang.org/x/sync v0.16.0/go.mod h1:1dzgHSNfp02xaA81J2MS99Qcpr2w7fw1gpm99rleRqA=
3140
golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
32-
golang.org/x/sys v0.23.0 h1:YfKFowiIMvtgl1UERQoTPPToxltDeZfbj4H7dVUCwmM=
33-
golang.org/x/sys v0.23.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
34-
golang.org/x/tools v0.24.0 h1:J1shsA93PJUEVaUSaay7UXAyE8aimq3GW0pjlolpa24=
35-
golang.org/x/tools v0.24.0/go.mod h1:YhNqVBIfWHdzvTLs0d8LCuMhkKUgSUKldakyV7W/WDQ=
36-
google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
37-
google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
41+
golang.org/x/sys v0.35.0 h1:vz1N37gP5bs89s7He8XuIYXpyY0+QlsKmzipCbUtyxI=
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golang.org/x/sys v0.35.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
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golang.org/x/tools v0.36.0 h1:kWS0uv/zsvHEle1LbV5LE8QujrxB3wfQyxHfhOk0Qkg=
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golang.org/x/tools v0.36.0/go.mod h1:WBDiHKJK8YgLHlcQPYQzNCkUxUypCaa5ZegCVutKm+s=
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google.golang.org/protobuf v1.36.6 h1:z1NpPI8ku2WgiWnf+t9wTPsn6eP1L7ksHUlkfLvd9xY=
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google.golang.org/protobuf v1.36.6/go.mod h1:jduwjTPXsFjZGTmRluh+L6NjiWu7pchiJ2/5YcXBHnY=
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gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
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gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
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gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

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