Add Rybbit analytics integration and configuration. #4
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📝 WalkthroughWalkthroughAdds environment-configured Rybbit analytics (async event emission) to the Go server, updates README to document PORT and RYBBIT variables and events, removes CGO from the Docker build, and adds Changes
Sequence Diagram(s)sequenceDiagram
actor Client
participant Handler as Go HTTP Handler
participant Rybbit as Rybbit API
participant Logger as Local Logger
Client->>Handler: HTTP request
Handler->>Handler: Determine route & metadata (path, referrer, UA)
alt Analytics enabled (all RYBBIT env vars set)
rect rgb(235,245,255)
Handler->>Handler: Build RybbitEvent (type, site, IP, title, etc.)
Handler->>Rybbit: sendRybbitEvent() (goroutine) POST /events with API key
Rybbit-->>Handler: async response (200/4xx/5xx)
Handler->>Logger: Log non-fatal send errors
end
else Analytics disabled
Note over Handler: No event emitted
end
Handler-->>Client: HTTP response (non-blocking)
Estimated code review effort🎯 4 (Complex) | ⏱️ ~45 minutes Poem
Pre-merge checks and finishing touches❌ Failed checks (1 warning)
✅ Passed checks (2 passed)
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Actionable comments posted: 0
🧹 Nitpick comments (4)
main.go (4)
38-44: Consider removing unused event type constants.
EventCustomandEventPerformanceare defined but never used in the codebase. Consider removing them to reduce dead code, or document their intended future use.
141-146: Reusehttp.Clientfor better connection pooling and resource efficiency.Creating a new
http.Clientper event call prevents connection reuse. Consider creating a package-level client (with appropriate timeout) to leverage connection pooling, especially under high request volume.🔎 Proposed fix
Add a package-level client:
var rybbitClient = &http.Client{Timeout: 5 * time.Second}Then in
sendRybbitEvent:- client := &http.Client{Timeout: 5 * time.Second} - resp, err := client.Do(req) + resp, err := rybbitClient.Do(req)
124-152: Consider bounding concurrent analytics goroutines.Unbounded goroutine spawning per request could lead to resource exhaustion if the Rybbit API becomes slow or unresponsive. For a low-traffic service this is likely fine, but for production hardening, consider using a buffered channel or worker pool pattern to limit concurrency.
262-280: Usestringspackage and strip port fromRemoteAddr.Two issues:
- Using
bytes.IndexByteon a string requires conversion;strings.Indexis more idiomatic.r.RemoteAddrincludes the port (e.g.,192.168.1.1:12345), which should be stripped for a clean IP address.🔎 Proposed fix
+import "strings" + func getClientIP(r *http.Request) string { // Try X-Forwarded-For header first (for proxies/load balancers) if xff := r.Header.Get("X-Forwarded-For"); xff != "" { // X-Forwarded-For can contain multiple IPs, take the first one - if idx := bytes.IndexByte([]byte(xff), ','); idx > 0 { - return xff[:idx] + if idx := strings.Index(xff, ","); idx > 0 { + return strings.TrimSpace(xff[:idx]) } - return xff + return strings.TrimSpace(xff) } // Try X-Real-IP header if xri := r.Header.Get("X-Real-IP"); xri != "" { return xri } // Fall back to RemoteAddr (strip port if present) - return r.RemoteAddr + if host, _, err := net.SplitHostPort(r.RemoteAddr); err == nil { + return host + } + return r.RemoteAddr }Note: This requires adding
"net"to imports and allows removing"bytes"since it's no longer needed.
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.gitignoreREADME.mdmain.go
🔇 Additional comments (5)
.gitignore (1)
1-1: LGTM!Standard practice to exclude JetBrains IDE configuration directories from version control.
README.md (1)
49-80: LGTM!Clear and comprehensive documentation for the Rybbit analytics integration. The example Docker command and explanation of required environment variables will help users configure the feature correctly.
main.go (3)
99-111: LGTM!Good defensive coding with the partial configuration warning. This will help users debug misconfigurations.
169-178: Verify privacy compliance for sending IP addresses to analytics.IP addresses are considered personal data under GDPR and similar regulations. Sending raw IP addresses to a third-party analytics service may require user consent or a legitimate interest basis. Consider whether IP anonymization or hashing would be more appropriate for your compliance requirements.
246-259: LGTM!Good use of
EventOutboundfor tracking successful redirects, and including the trip slug inPageTitleprovides useful context in analytics.
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⚠️ Outside diff range comments (3)
main.go (3)
3-17: Critical: Missingdatabase/sqlimport.The code uses
dbvariable (lines 89, 234) and database operations, and imports the SQLite3 driver at line 16, but thedatabase/sqlpackage import is missing. This will cause a compilation error.🔎 Proposed fix
import ( "bytes" + "database/sql" "encoding/json" "fmt" "gopkg.in/yaml.v3"
240-248: Missing cache invalidation mechanism.The cache is populated at line 311 and checked at lines 240-248, but there's no cache invalidation or TTL mechanism. The summary mentions removing
startCacheResetter, but without any cache invalidation, stale entries could persist indefinitely. This may cause redirects to outdated trips when:
- An ongoing trip ends and a new one begins
- The user's trip list changes
Consider implementing a TTL-based cache expiration or periodic cache reset.
💡 Example implementation with TTL
type cacheEntry struct { url string expiresAt time.Time } var cache = struct { sync.RWMutex store map[string]cacheEntry }{store: make(map[string]cacheEntry)} // When checking cache: if found && time.Now().Before(entry.expiresAt) { // use cached value } // When setting cache: cache.store[host] = cacheEntry{ url: target, expiresAt: time.Now().Add(1 * time.Hour), // or your preferred TTL }Also applies to: 310-312
197-326: Add GDPR/privacy compliance documentation and user consent mechanism.The application collects and transmits IP addresses (personal data under GDPR) to both a local database and an external Rybbit Analytics API, including Polarsteps usernames and other identifiers. This requires:
- A privacy policy documenting data collection, purpose, and retention
- Explicit user consent before collecting IP-based geolocation and analytics data
- Data Processing Agreements with external processors (Rybbit)
- A mechanism to allow users to opt out of analytics collection
Ensure compliance with GDPR Article 6 (lawful basis), Article 13 (transparency), and Article 28 (data processor agreements).
🧹 Nitpick comments (4)
main.go (4)
45-77: LGTM with optional observation.The analytics types and constants are well-structured. Note that
EventCustomandEventPerformanceconstants are defined but not currently used, and someRybbitEventfields (likeScreenWidth,ScreenHeight) are never populated. This is acceptable for future extensibility or API compatibility.
135-175: Consider adding rate limiting for analytics requests.The async implementation with timeout and error handling is solid. However, there's no rate limiting on outbound analytics requests. During traffic spikes, this could spawn many concurrent goroutines making HTTP requests to the Rybbit API.
Consider implementing a worker pool pattern or semaphore to limit concurrent analytics requests.
💡 Example implementation with a semaphore
// At package level var analyticsSemaphore = make(chan struct{}, 10) // max 10 concurrent requests // In sendRybbitEvent, wrap the goroutine go func() { analyticsSemaphore <- struct{}{} // acquire defer func() { <-analyticsSemaphore }() // release payload, err := json.Marshal(event) // ... rest of the implementation }()
275-283: Refactor duplicate profile redirect tracking.Lines 275-283 and 294-302 contain identical code for tracking profile redirects. Consider extracting this into a helper function to reduce duplication.
🔎 Proposed refactor
func trackProfileRedirect(r *http.Request, host, username string) { sendRybbitEvent(RybbitEvent{ Type: EventPageview, Hostname: host, Pathname: r.URL.Path, UserAgent: r.Header.Get("User-Agent"), IPAddress: getClientIP(r), Referrer: r.Header.Get("Referer"), UserID: username, }) } // Then use it at both locations: trackProfileRedirect(r, host, username)Also applies to: 294-302
275-283: Reconsider event type for profile redirects.Profile redirects (lines 272-286 and 289-305) are tracked as
EventPageview, but they're actually external redirects to Polarsteps profile pages, similar to trip redirects. Consider usingEventOutboundfor consistency with the successful trip redirect at lines 317-326.Also applies to: 294-302
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🔇 Additional comments (7)
.gitignore (1)
1-1: LGTM!Standard practice to ignore JetBrains IDE configuration files.
README.md (1)
49-80: LGTM!The documentation clearly explains the environment variables, the requirement for all three Rybbit variables to be set, and the types of events tracked. The example docker command is well-structured and illustrative.
main.go (5)
80-80: LGTM!Using a package-level variable for configuration initialized at startup is a standard pattern.
104-117: LGTM!Analytics initialization is correctly placed after configuration loading and before starting the HTTP server. The logging provides good visibility into the analytics status.
121-133: LGTM!The all-or-nothing configuration approach is sound, and the warning for partial configuration helps prevent misconfiguration issues.
331-349: LGTM!The client IP extraction logic correctly handles proxy headers with appropriate precedence (X-Forwarded-For → X-Real-IP → RemoteAddr). The
idx > 0check at line 336 defensively prevents returning an empty string if the header is malformed.
7-7: No security advisories affect these versions. gopkg.in/yaml.v3 v3.0.1 is the fixed release for CVE-2022-28948, and github.com/mattn/go-sqlite3 v1.14.32 is secure with no known CVEs.
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⚠️ Outside diff range comments (1)
main.go (1)
90-90: Critical: Undefined variabledbcausing build failure.The pipeline failure reports "undefined: db" at this line. The variable
dbis being assigned but never declared. Add a package-level declaration fordbto fix this build error.🔎 Add package-level db declaration
Add this declaration near the other package-level variables (after line 81):
var db *sql.DBAnd ensure
database/sqlis imported at the top of the file.
🧹 Nitpick comments (3)
main.go (3)
137-175: LGTM! Async event emission is well-implemented.The function correctly sends events asynchronously to avoid blocking responses, includes proper error handling, and uses the configured HTTP client with timeout.
Optional: Consider adding concurrency control.
Under high traffic, spawning unbounded goroutines could consume resources. Consider adding a worker pool or rate limiter if you expect high request volumes, though the current implementation is acceptable for typical redirect service traffic.
211-217: Refactor to use getClientIP helper consistently.This IP extraction logic duplicates the more comprehensive
getClientIPfunction (lines 332-352). The existing code doesn't check theX-Real-IPheader, whichgetClientIPhandles.🔎 Use getClientIP helper
- ip := r.Header.Get("X-Forwarded-For") - if ip == "" { - ip = r.RemoteAddr - } - if realIP, _, err := net.SplitHostPort(ip); err == nil { - ip = realIP - } + ip := getClientIP(r)
188-188: Consider translating comment to English for consistency.This French comment ("Remove the www. prefix if present") is inconsistent with the English comments used throughout the rest of the codebase.
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Dockerfilemain.go
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main.go
[error] 90-90: undefined: db
🔇 Additional comments (8)
main.go (7)
45-77: LGTM! Well-structured analytics types.The event types, RybbitEvent structure, and RybbitConfig are well-defined with appropriate JSON tags using
omitemptyfor optional fields.
123-134: LGTM! Solid configuration initialization.The function correctly requires all three environment variables to enable analytics and provides a helpful warning when partially configured.
193-209: LGTM! Error tracking for unknown hosts.The analytics event correctly tracks 404 errors with appropriate metadata.
252-269: LGTM! Proper error tracking and fallback.The analytics event correctly tracks API errors and the code appropriately falls back to redirecting to the user's profile page.
271-306: LGTM! Profile redirect tracking implemented.The pageview events correctly track scenarios where users are redirected to their profile page. The use of
EventPageviewis reasonable for these cases.
316-329: LGTM! Outbound link tracking implemented correctly.The analytics event properly tracks successful redirects with relevant metadata including the trip slug in the page title.
332-352: LGTM! Robust IP extraction logic.The function correctly handles multiple headers with proper fallback order and correctly extracts the first IP from comma-separated
X-Forwarded-Forvalues.Dockerfile (1)
6-6: No changes required – comment addresses non-existent SQLite3 dependency.This codebase uses only the Go standard library and
gopkg.in/yaml.v3. There is nogo-sqlite3dependency, no CGO requirement, and no database-related code. The application is a pure-Go HTTP redirector that reads domain configuration from YAML and fetches trip data from an external API. The Dockerfile is correctly configured for a pure-Go build without CGO.Likely an incorrect or invalid review comment.
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