添加本地 cache 功能，并适当重构代码 #7

2025-03-16T02:03:37+08:00

awkj commented

2025-03-16 02:03:37 +08:00

(Migrated from github.com)

通过控制 CacheExpiry = 0 * time.Minute 实现本地文件的缓存

Summary by CodeRabbit

New Features
- Introduced a caching mechanism that accelerates responses and reduces redundant network calls.
- Enabled automatic configuration management, ensuring smoother service updates.
Refactor
- Streamlined request handling and error logging for improved reliability and system performance.

通过控制 CacheExpiry = 0 * time.Minute 实现本地文件的缓存  ## Summary by CodeRabbit - **New Features** - Introduced a caching mechanism that accelerates responses and reduces redundant network calls. - Enabled automatic configuration management, ensuring smoother service updates. - **Refactor** - Streamlined request handling and error logging for improved reliability and system performance.

coderabbitai[bot] commented

2025-03-16 02:03:44 +08:00

(Migrated from github.com)

Walkthrough

This pull request updates the ghproxy/main.go file. It renames several constants (e.g., sizeLimit to MaxFileSize, host to ListenHost, and port to ListenPort) and introduces new constants (CacheDir and CacheExpiry). A new sync.Map named cache is added for caching, along with new structs (Config and CachedResponse) and several utility functions (e.g., initRegexps(), initHTTPClient(), generateCacheKey(), header manipulation functions, and logging helpers). The control flow is modified to check for cached responses before making HTTP requests, and initialization now includes creating the cache directory and reloading configuration periodically.

Changes

File	Change Summary
ghproxy/main.go	- Renamed constants: `sizeLimit` → `MaxFileSize`, `host` → `ListenHost`, `port` → `ListenPort` - Added constants: `CacheDir`, `CacheExpiry`
ghproxy/main.go	- Added a new `sync.Map` variable named `cache` - Defined new structs: `Config`, `CachedResponse`
ghproxy/main.go	- Introduced new functions: `initRegexps()`, `initHTTPClient()`, `generateCacheKey()`, `setHeaders()`, `copyHeaders()`, `removeHeaders()`, `closeWithLog()` - Modified `init()`, `main()`, `handler()`, and `proxy()` to improve caching and error handling

Sequence Diagram(s)

sequenceDiagram
    participant Client
    participant Proxy as ghproxy
    participant Cache as "Cache (sync.Map)"
    participant HTTP as "HTTP Client"

    Client ->> Proxy: HTTP Request
    Proxy ->> Cache: generateCacheKey() and check cache
    alt Cached response available
        Cache -->> Proxy: Return CachedResponse
        Proxy ->> Client: Serve cached response
    else No cached response
        Proxy ->> HTTP: Forward HTTP Request
        HTTP -->> Proxy: Return fresh response
        Proxy ->> Cache: Store new CachedResponse
        Proxy ->> Client: Serve fresh response
    end

Poem

I'm a bunny with a hop in my stride,
Coding changes spread far and wide.
New constants and caches, neat and bright,
Functions modular, making code just right.
In the garden of code, I cheer in delight!
🐰💻 Hop on for a smoother flight!
Let’s hop along, day and night!

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## Walkthrough This pull request updates the `ghproxy/main.go` file. It renames several constants (e.g., `sizeLimit` to `MaxFileSize`, `host` to `ListenHost`, and `port` to `ListenPort`) and introduces new constants (`CacheDir` and `CacheExpiry`). A new `sync.Map` named `cache` is added for caching, along with new structs (`Config` and `CachedResponse`) and several utility functions (e.g., `initRegexps()`, `initHTTPClient()`, `generateCacheKey()`, header manipulation functions, and logging helpers). The control flow is modified to check for cached responses before making HTTP requests, and initialization now includes creating the cache directory and reloading configuration periodically. ## Changes | File | Change Summary | |---------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ghproxy/main.go | - Renamed constants: `sizeLimit` → `MaxFileSize`, `host` → `ListenHost`, `port` → `ListenPort` <br> - Added constants: `CacheDir`, `CacheExpiry` | | ghproxy/main.go | - Added a new `sync.Map` variable named `cache` <br> - Defined new structs: `Config`, `CachedResponse` | | ghproxy/main.go | - Introduced new functions: `initRegexps()`, `initHTTPClient()`, `generateCacheKey()`, `setHeaders()`, `copyHeaders()`, `removeHeaders()`, `closeWithLog()` <br> - Modified `init()`, `main()`, `handler()`, and `proxy()` to improve caching and error handling | ## Sequence Diagram(s) ```mermaid sequenceDiagram participant Client participant Proxy as ghproxy participant Cache as "Cache (sync.Map)" participant HTTP as "HTTP Client" Client ->> Proxy: HTTP Request Proxy ->> Cache: generateCacheKey() and check cache alt Cached response available Cache -->> Proxy: Return CachedResponse Proxy ->> Client: Serve cached response else No cached response Proxy ->> HTTP: Forward HTTP Request HTTP -->> Proxy: Return fresh response Proxy ->> Cache: Store new CachedResponse Proxy ->> Client: Serve fresh response end ``` ## Poem > I'm a bunny with a hop in my stride, > Coding changes spread far and wide. > New constants and caches, neat and bright, > Functions modular, making code just right. > In the garden of code, I cheer in delight! > 🐰💻 Hop on for a smoother flight! > Let’s hop along, day and night!   > [!TIP] > <details> > <summary>⚡🧪 Multi-step agentic review comment chat (experimental)</summary> > > - We're introducing multi-step agentic chat in review comments. This experimental feature enhances review discussions with the CodeRabbit agentic chat by enabling advanced interactions, including the ability to create pull requests directly from comments. > - To enable this feature, set early_access to true under in the settings. > > </details>      <details> <summary>✨ Finishing Touches</summary> - [ ]  📝 Generate Docstrings </details>   --- Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. 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coderabbitai[bot] (Migrated from github.com) reviewed 2025-03-16 02:07:09 +08:00

coderabbitai[bot] (Migrated from github.com) left a comment

Actionable comments posted: 1

🧹 Nitpick comments (4)

ghproxy/main.go (4)

34-39: Global variables for caching and config.

cache = sync.Map{} is acceptable for concurrency. Just ensure all access is via Load/Store/LoadOrStore.

Consider adding appropriate locks (configLock.RLock() / RUnlock()) when reading config.

46-51: Struct CachedResponse.
Encapsulating response data and timestamp is a solid approach for caching. Keep an eye on memory growth if many large responses accumulate.

53-64: init() function.

Creating the cache directory is good. log.Fatalf is acceptable to fail early if creation fails.

Using a background goroutine to call loadConfig() every 10 minutes is fine, but ensure that other goroutines reading config handle concurrency properly.

181-182: Removing security headers and setting custom ones.
Removing Content-Security-Policy, Referrer-Policy, Strict-Transport-Security can pose a security risk if you rely on them for security. Make sure this is intentional.

Would you like an example of selectively preserving certain security headers?

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 1aa2b15a3e and 102e1bb97c.

📒 Files selected for processing (1)

ghproxy/main.go (6 hunks)

🧰 Additional context used

🪛 golangci-lint (1.62.2)

ghproxy/main.go

150-150: Error return value of c.Writer.Write is not checked

(errcheck)

🔇 Additional comments (29)

ghproxy/main.go (29)

7-7: Good use of the log package.
This import provides straightforward logging capabilities. No concerns here.

11-11: Importing path/filepath.
This is essential for handling file path operations needed for caching.

17-17: Empty line addition is fine.
No remarks.

18-19: SHA-256 and hex imports.
Using these libraries is appropriate for producing reliable, collision-resistant cache keys.

21-21: Gin framework import.
This is a good choice for simplifying HTTP server logic.

25-30: Revisiting constants for file size and caching.

MaxFileSize = 10 * 1024 * 1024 * 1024 could lead to high memory usage if you attempt to read extremely large files into memory. Consider streaming large files rather than loading them fully.

CacheExpiry = 0 * time.Minute disables caching, which might conflict with your objective of “添加本地 cache 功能.” Verify if this is intentional.

Would you like a demonstration of a streaming approach and a non-zero default caching duration?

41-44: Struct Config for WhiteList/BlackList.
This structure is straightforward and consistent with JSON usage.

66-78: initRegexps() function.
Looks good. The logic for validating GitHub and Hugging Face URLs seems comprehensive.

80-95: initHTTPClient() usage.
Creating a custom Transport with timeouts is a best practice in production services.

97-99: Changing Gin mode & creating router.
Code is clear and straightforward.

103-105: Starting the HTTP server.
Using log.Fatalf is consistent with the approach in init(). This will halt the application if the server cannot start.

111-111: Second TrimPrefix.
Double-trimming leading slashes helps in normalizing the path. No issues found.

119-119: Checking matches.
If the URL does not pass validation, returns “无效输入”. This guard clause is good.

124-127: White list checks.
Denying access unless matched is appropriate. Just ensure the user is aware these checks happen before black list checks.

128-131: Black list checks.
Likewise, good logic for black list blocking.

141-146: Generating and retrieving cache key.

cacheKey := generateCacheKey(u) is neat.

Logging “Using cached response for %s” helps debugging.

147-152: Cache expiry check.
The logic looks correct—if it’s older than CacheExpiry, a new request is made.

🧰 Tools

🪛 golangci-lint (1.62.2)

150-150: Error return value of c.Writer.Write is not checked

(errcheck)

156-156: Logging message “use proxy response”.
This is fine for debugging.

164-164: Copying request headers.
Be aware that copying all headers, including cookies or auth tokens, could leak sensitive info to unwanted endpoints if the path is manipulated.

Do you want to restrict certain headers for improved security?

172-172: defer closeWithLog(resp.Body)
This pattern is good. Ensures resources are properly closed, and logs if an error arises.

175-175: File size check.
Returning “File too large.” if size exceeds MaxFileSize is aligned with your limit.

205-219: Storing the response to cache.

Good approach to store a CachedResponse in memory and write the file.

Make sure concurrent writes to the same file are handled or prevented.

Consider verifying concurrency by searching for repeated calls to the same URL. Would you like a helper script to check for possible concurrency issues?

222-225: generateCacheKey(u string).
Using SHA-256 is robust for collision avoidance.

230-230: Logging config load error.
Graceful fallback works, as you neither crash nor skip later loads.

238-238: Logging JSON decode error.
Same principle—non-fatal, next iteration might succeed.

265-271: setHeaders function.
Implementation is correct. The loop structure is fine.

273-279: copyHeaders function.
Similarly correct. Just be careful with security-sensitive headers.

281-285: removeHeaders function.
Helpful for removing unwanted or unsafe headers.

287-291: closeWithLog utility.
This pattern is beneficial for debugging I/O close errors.

**Actionable comments posted: 1** <details> <summary>🧹 Nitpick comments (4)</summary><blockquote> <details> <summary>ghproxy/main.go (4)</summary><blockquote> `34-39`: **Global variables for caching and config.** - `cache = sync.Map{}` is acceptable for concurrency. Just ensure all access is via `Load/Store/LoadOrStore`. - Consider adding appropriate locks (`configLock.RLock() / RUnlock()`) when reading `config`. --- `46-51`: **Struct `CachedResponse`.** Encapsulating response data and timestamp is a solid approach for caching. Keep an eye on memory growth if many large responses accumulate. --- `53-64`: **`init()` function.** - Creating the cache directory is good. `log.Fatalf` is acceptable to fail early if creation fails. - Using a background goroutine to call `loadConfig()` every 10 minutes is fine, but ensure that other goroutines reading `config` handle concurrency properly. --- `181-182`: **Removing security headers and setting custom ones.** Removing `Content-Security-Policy`, `Referrer-Policy`, `Strict-Transport-Security` can pose a security risk if you rely on them for security. Make sure this is intentional. Would you like an example of selectively preserving certain security headers? </blockquote></details> </blockquote></details> <details> <summary>📜 Review details</summary> **Configuration used: CodeRabbit UI** **Review profile: CHILL** **Plan: Pro** <details> <summary>📥 Commits</summary> Reviewing files that changed from the base of the PR and between 1aa2b15a3e79b667dab2dcc0e2173577199edb29 and 102e1bb97c2ba4ffa7d4836abf7af193cafd5246. </details> <details> <summary>📒 Files selected for processing (1)</summary> * `ghproxy/main.go` (6 hunks) </details> <details> <summary>🧰 Additional context used</summary> <details> <summary>🪛 golangci-lint (1.62.2)</summary> <details> <summary>ghproxy/main.go</summary> 150-150: Error return value of `c.Writer.Write` is not checked (errcheck) </details> </details> </details> <details> <summary>🔇 Additional comments (29)</summary><blockquote> <details> <summary>ghproxy/main.go (29)</summary> `7-7`: **Good use of the `log` package.** This import provides straightforward logging capabilities. No concerns here. --- `11-11`: **Importing `path/filepath`.** This is essential for handling file path operations needed for caching. --- `17-17`: **Empty line addition is fine.** No remarks. --- `18-19`: **SHA-256 and hex imports.** Using these libraries is appropriate for producing reliable, collision-resistant cache keys. --- `21-21`: **Gin framework import.** This is a good choice for simplifying HTTP server logic. --- `25-30`: **Revisiting constants for file size and caching.** - `MaxFileSize = 10 * 1024 * 1024 * 1024` could lead to high memory usage if you attempt to read extremely large files into memory. Consider streaming large files rather than loading them fully. - `CacheExpiry = 0 * time.Minute` disables caching, which might conflict with your objective of “添加本地 cache 功能.” Verify if this is intentional. Would you like a demonstration of a streaming approach and a non-zero default caching duration? --- `41-44`: **Struct `Config` for WhiteList/BlackList.** This structure is straightforward and consistent with JSON usage. --- `66-78`: **`initRegexps()` function.** Looks good. The logic for validating GitHub and Hugging Face URLs seems comprehensive. --- `80-95`: **`initHTTPClient()` usage.** Creating a custom `Transport` with timeouts is a best practice in production services. --- `97-99`: **Changing Gin mode & creating router.** Code is clear and straightforward. --- `103-105`: **Starting the HTTP server.** Using `log.Fatalf` is consistent with the approach in `init()`. This will halt the application if the server cannot start. --- `111-111`: **Second `TrimPrefix`.** Double-trimming leading slashes helps in normalizing the path. No issues found. --- `119-119`: **Checking matches.** If the URL does not pass validation, returns “无效输入”. This guard clause is good. --- `124-127`: **White list checks.** Denying access unless matched is appropriate. Just ensure the user is aware these checks happen before black list checks. --- `128-131`: **Black list checks.** Likewise, good logic for black list blocking. --- `141-146`: **Generating and retrieving cache key.** - `cacheKey := generateCacheKey(u)` is neat. - Logging “Using cached response for %s” helps debugging. --- `147-152`: **Cache expiry check.** The logic looks correct—if it’s older than `CacheExpiry`, a new request is made. <details> <summary>🧰 Tools</summary> <details> <summary>🪛 golangci-lint (1.62.2)</summary> 150-150: Error return value of `c.Writer.Write` is not checked (errcheck) </details> </details> --- `156-156`: **Logging message “use proxy response”.** This is fine for debugging. --- `164-164`: **Copying request headers.** Be aware that copying all headers, including cookies or auth tokens, could leak sensitive info to unwanted endpoints if the path is manipulated. Do you want to restrict certain headers for improved security? --- `172-172`: **`defer closeWithLog(resp.Body)`** This pattern is good. Ensures resources are properly closed, and logs if an error arises. --- `175-175`: **File size check.** Returning “File too large.” if size exceeds `MaxFileSize` is aligned with your limit. --- `205-219`: **Storing the response to cache.** - Good approach to store a `CachedResponse` in memory and write the file. - Make sure concurrent writes to the same file are handled or prevented. Consider verifying concurrency by searching for repeated calls to the same URL. Would you like a helper script to check for possible concurrency issues? --- `222-225`: **`generateCacheKey(u string)`.** Using SHA-256 is robust for collision avoidance. --- `230-230`: **Logging config load error.** Graceful fallback works, as you neither crash nor skip later loads. --- `238-238`: **Logging JSON decode error.** Same principle—non-fatal, next iteration might succeed. --- `265-271`: **`setHeaders` function.** Implementation is correct. The loop structure is fine. --- `273-279`: **`copyHeaders` function.** Similarly correct. Just be careful with security-sensitive headers. --- `281-285`: **`removeHeaders` function.** Helpful for removing unwanted or unsafe headers. --- `287-291`: **`closeWithLog` utility.** This pattern is beneficial for debugging I/O close errors. </details> </blockquote></details> </details>

ghproxy/main.go

coderabbitai[bot] (Migrated from github.com) commented

2025-03-16 02:07:09 +08:00

🛠️ Refactor suggestion

Reading and writing response body.

You handle I/O errors with logs, which is good.
Storing large responses in memory can be risky for memory usage. Consider streaming if you expect very large files.

_🛠️ Refactor suggestion_ **Reading and writing response body.** - You handle I/O errors with logs, which is good. - Storing large responses in memory can be risky for memory usage. Consider streaming if you expect very large files.

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Reference: 3344/hubproxy#7

添加 本地 cache 功能，并适当重构代码 #7