Config: Expose merged configuration for easier debugging (#6049)

cmd/algod/main.go

@@ -17,6 +17,7 @@
 package main
 
 import (
+	"encoding/json"
 	"flag"
 	"fmt"
 	"math/rand"
@@ -174,6 +175,14 @@ func run() int {
 		log.Fatalf("Cannot load config: %v", err)
 	}
 
+	// log is not setup yet
+	fmt.Printf("Config loaded from %s\n", absolutePath)
+	fmt.Println("Configuration after loading/defaults merge: ")
+	err = json.NewEncoder(os.Stdout).Encode(cfg)
+	if err != nil {
+		fmt.Println("Error encoding config: ", err)
+	}
+
 	// set soft memory limit, if configured
 	if cfg.GoMemLimit > 0 {
 		debug.SetMemoryLimit(int64(cfg.GoMemLimit))

daemon/algod/api/algod.oas2.json

@@ -216,6 +216,33 @@
         }
       }
     },
+    "/debug/settings/config": {
+      "get": {
+        "description": "Returns the merged (defaults + overrides) config file in json.",
+        "tags": [
+          "private"
+        ],
+        "produces": [
+          "application/json"
+        ],
+        "schemes": [
+          "http"
+        ],
+        "summary": "Gets the merged config file.",
+        "operationId": "GetConfig",
+        "responses": {
+          "200": {
+            "description": "The merged config file in json.",
+            "schema": {
+              "type": "string"
+            }
+          },
+          "default": {
+            "description": "Unknown Error"
+          }
+        }
+      }
+    },
     "/v2/accounts/{address}": {
       "get": {
         "description": "Given a specific account public key, this call returns the accounts status, balance and spendable amounts",

daemon/algod/api/algod.oas3.yml

@@ -2788,6 +2788,32 @@
   },
   "openapi": "3.0.1",
   "paths": {
+    "/debug/settings/config": {
+      "get": {
+        "description": "Returns the merged (defaults + overrides) config file in json.",
+        "operationId": "GetConfig",
+        "responses": {
+          "200": {
+            "content": {
+              "application/json": {
+                "schema": {
+                  "type": "string"
+                }
+              }
+            },
+            "description": "The merged config file in json."
+          },
+          "default": {
+            "content": {},
+            "description": "Unknown Error"
+          }
+        },
+        "summary": "Gets the merged config file.",
+        "tags": [
+          "private"
+        ]
+      }
+    },
     "/debug/settings/pprof": {
       "get": {
         "description": "Retrieves the current settings for blocking and mutex profiles",