include/pika_client_conn.h (1)

87-87: Consider documenting the authentication flow.

The authentication mechanism spans multiple methods (InitUser, DoAuth, UnAuth, IsAuthed) and maintains state via authenticated_ and user_ members. Consider adding documentation to clarify:

1. The role of each authentication method
2. The state transitions between authenticated/unauthenticated
3. The interaction with the ACL system

Also applies to: 129-130

conf/pika.conf (1)

694-694: Document the new configuration parameter.

The newly added best-delete-min-ratio parameter appears to be related to the OBD_Compact strategy, but lacks documentation explaining its purpose and impact.

Consider adding a comment block above the parameter explaining:

• Its purpose and relationship with OBD_Compact
• Valid value range and default value
• Impact on compaction behavior
• Relationship with other compaction parameters like force-compact-min-delete-ratio

+ # The minimum ratio of deleted entries required for considering a file
+ # as a candidate for compaction in the OBD_Compact strategy.
+ # Valid range: [1-100], Default: 10
 best-delete-min-ratio : 10

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#!/bin/bash
# Description: Check the relationship between auth-related methods
# Look for calls to InitUser and its interaction with other auth methods

# Search for InitUser implementation and usage
echo "=== InitUser implementation and usage ==="
rg "InitUser.*\(" -A 10

# Search for auth-related method interactions
echo "=== Auth method interactions ==="
rg "DoAuth|UnAuth|IsAuthed|AuthRequired" -A 5

src/pika_client_conn.cc (2)

261-261: Enhance comment clarity for RTC interception.

The current comment could be more descriptive about why only these commands are intercepted.

-  // currently we only Intercept: Get, HGet
+  // Only Get and HGet commands are intercepted for RTC cache optimization
+  // as they are the most common read operations

---

358-368: Add descriptive comment for ACL check logic.

The ACL check implementation would benefit from a clear comment explaining the permission verification process.

+  // Verify user permissions before cache read:
+  // - Check command level permissions
+  // - Check key level access
+  // - Check channel permissions
+  // - Verify sub-command validity
+  // - Confirm authentication status
   int8_t subCmdIndex = -1;
   std::string errKey;
   auto checkRes = user_->CheckUserPermission(c_ptr, argv, subCmdIndex, &errKey);

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src/pika_client_conn.cc (1)

291-293: Consider splitting complex condition for better readability.

The multiple conditions could be split into separate checks with meaningful variable names for better maintainability.

-    if (g_pika_conf->rtc_cache_read_enabled() && argvs.size() == 1 && IsInterceptedByRTC(opt) &&
-        PIKA_CACHE_NONE != g_pika_conf->cache_mode() && !IsInTxn()) {
+    bool is_cache_enabled = g_pika_conf->rtc_cache_read_enabled();
+    bool is_single_command = argvs.size() == 1;
+    bool is_cacheable_command = IsInterceptedByRTC(opt);
+    bool has_valid_cache_mode = PIKA_CACHE_NONE != g_pika_conf->cache_mode();
+    bool not_in_transaction = !IsInTxn();
+    
+    if (is_cache_enabled && is_single_command && is_cacheable_command && 
+        has_valid_cache_mode && not_in_transaction) {

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tools/pika_exporter/exporter/metrics/parser.go (4)

33-57: Optimize CheckContainsEmptyValue method in VersionChecker336

To improve the performance of the CheckContainsEmptyValue method, consider using a map[string]struct{} for the EmptyValueName field. This change reduces the lookup time from O(n) to O(1).

Apply this diff to optimize the lookup:

 type VersionChecker336 struct {
-	EmptyValueName []string
+	EmptyValueName map[string]struct{}
 }

 func (v *VersionChecker336) CheckContainsEmptyValue(key string) bool {
 	if v.EmptyValueName == nil {
-		v.EmptyValueName = []string{
+		v.EmptyValueName = map[string]struct{}{
-			"instantaneous_output_repl_kbps",
+			"instantaneous_output_repl_kbps": {},
 			"total_net_output_bytes":                    {},
 			"cache_db_num":                              {},
 			"hits_per_sec":                              {},
 			"cache_status":                              {},
 			"total_net_input_bytes":                     {},
 			"instantaneous_output_kbps":                 {},
 			"instantaneous_input_kbps":                  {},
 			"total_net_repl_input_bytes":                {},
 			"instantaneous_input_repl_kbps":             {},
 			"slow_logs_count":                           {},
 			"total_net_repl_output_bytes":               {},
 			"cache_memory":                              {},
 		}
 	}
-	for _, str := range v.EmptyValueName {
-		if str == key {
+	if _, exists := v.EmptyValueName[key]; exists {
 		return true
 	}
 	return false
 }

---

63-78: Optimize CheckContainsEmptyValue method in VersionChecker355

Similar to VersionChecker336, using a map[string]struct{} for EmptyValueName will enhance performance by providing constant-time lookups.

Apply this diff to optimize the method:

 type VersionChecker355 struct {
-	EmptyValueName []string
+	EmptyValueName map[string]struct{}
 }

 func (v *VersionChecker355) CheckContainsEmptyValue(key string) bool {
 	if v.EmptyValueName == nil {
-		v.EmptyValueName = []string{
+		v.EmptyValueName = map[string]struct{}{
-			"cache_db_num",
+			"cache_db_num":    {},
 			"cache_status":    {},
 			"cache_memory":    {},
 			"hits_per_sec":    {},
 		}
 	}
-	for _, str := range v.EmptyValueName {
-		if str == key {
+	if _, exists := v.EmptyValueName[key]; exists {
 		return true
 	}
 	return false
 }

---

84-99: Optimize CheckContainsEmptyValue method in VersionChecker350

Again, implementing a map[string]struct{} for EmptyValueName enhances lookup efficiency.

Apply this diff to optimize the method:

 type VersionChecker350 struct {
-	EmptyValueName []string
+	EmptyValueName map[string]struct{}
 }

 func (v *VersionChecker350) CheckContainsEmptyValue(key string) bool {
 	if v.EmptyValueName == nil {
-		v.EmptyValueName = []string{
+		v.EmptyValueName = map[string]struct{}{
-			"cache_db_num",
+			"cache_db_num":    {},
 			"cache_status":    {},
 			"cache_memory":    {},
 			"hits_per_sec":    {},
 			"slow_logs_count": {},
 		}
 	}
-	for _, str := range v.EmptyValueName {
-		if str == key {
+	if _, exists := v.EmptyValueName[key]; exists {
 		return true
 	}
 	return false
 }

---

309-309: Redundant empty line

The added empty line at line 309 is unnecessary and can be removed to maintain code consistency and readability.

tools/pika_exporter/exporter/pika.go (2)

267-282: Enhance version handling in selectversion function

The selectversion function currently handles specific version strings explicitly. This approach may not scale well with future versions and could lead to maintenance challenges. Consider using semantic version parsing to handle version comparisons more robustly, supporting version ranges and defaulting to the appropriate VersionChecker implementations.

Apply the following changes to improve version handling:

+import (
+    "github.com/blang/semver"
+)

 func selectversion(versionStr string) metrics.VersionChecker {
-    var v metrics.VersionChecker
-
-    switch version {
-    case "3.3.6":
-        v = &metrics.VersionChecker336{}
-    case "3.5.5":
-        v = &metrics.VersionChecker355{}
-    case "3.5.0":
-        v = &metrics.VersionChecker350{}
-    default:
-        return nil
-    }
-    return v
+    version, err := semver.Parse(versionStr)
+    if err != nil {
+        log.Warnf("Invalid version format: %s", versionStr)
+        return nil
+    }
+
+    if version.Major == 3 {
+        if version.Minor == 3 && version.Patch >= 6 {
+            return &metrics.VersionChecker336{}
+        } else if version.Minor == 5 {
+            if version.Patch >= 5 {
+                return &metrics.VersionChecker355{}
+            } else if version.Patch >= 0 {
+                return &metrics.VersionChecker350{}
+            }
+        }
+    }
+
+    log.Warnf("Unsupported Pika version: %s", versionStr)
+    return nil
 }

This refactor:

• Utilizes the semver package for semantic version parsing.
• Supports version ranges, allowing for easier future maintenance.
• Logs a warning when an unsupported or invalid version is encountered.

Remember to update your go.mod file to include the github.com/blang/semver package.

---

267-282: Use consistent naming conventions for function names

In Go, the convention is to use mixedCaps (camelCase) for function names. The function selectversion should be renamed to selectVersion to follow Go naming conventions, improving code readability and consistency.

Apply this diff:

-func selectversion(versionStr string) metrics.VersionChecker {
+func selectVersion(versionStr string) metrics.VersionChecker {
     // function body
 }

Also, update all references to this function:

 parseOpt := metrics.ParseOption{
     Version:        version,
     Extracts:       extracts,
     Info:           info,
-    CurrentVersion: selectversion(version.Original()),
+    CurrentVersion: selectVersion(version.Original()),
 }

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