Added LOG_JSON_SPACES to control json beautify (#2483)

* Added: environment var LOG_JSON_SPACES with default value 2. Used to no beautify JSON on handler.ts
Fix: logger.verbose was not working because default log level was info

* Update handler.ts

---------

Co-authored-by: patrick <patrick.alves@br.experian.com>
Co-authored-by: Henry Heng <henryheng@flowiseai.com>

packages/components/src/handler.ts

@@ -14,16 +14,24 @@ import { ChainValues } from '@langchain/core/utils/types'
 import { AgentAction } from '@langchain/core/agents'
 import { LunaryHandler } from '@langchain/community/callbacks/handlers/lunary'
 
-import { getCredentialData, getCredentialParam } from './utils'
+import { getCredentialData, getCredentialParam, getEnvironmentVariable } from './utils'
 import { ICommonObject, INodeData } from './Interface'
 
 interface AgentRun extends Run {
     actions: AgentAction[]
 }
 
+function tryGetJsonSpaces() {
+    try {
+        return parseInt(getEnvironmentVariable('LOG_JSON_SPACES') ?? '2')
+    } catch (err) {
+        return 2
+    }
+}
+
 function tryJsonStringify(obj: unknown, fallback: string) {
     try {
-        return JSON.stringify(obj, null, 2)
+        return JSON.stringify(obj, null, tryGetJsonSpaces())
     } catch (err) {
         return fallback
     }
@@ -49,10 +57,9 @@ export class ConsoleCallbackHandler extends BaseTracer {
     constructor(logger: Logger) {
         super()
         this.logger = logger
+        logger.level = getEnvironmentVariable('LOG_LEVEL') ?? 'info'
     }
 
-    // utility methods
-
     getParents(run: Run) {
         const parents: Run[] = []
         let currentRun = run
@@ -79,8 +86,6 @@ export class ConsoleCallbackHandler extends BaseTracer {
         return string
     }
 
-    // logging methods
-
     onChainStart(run: Run) {
         const crumbs = this.getBreadcrumbs(run)
         this.logger.verbose(`[chain/start] [${crumbs}] Entering Chain run with input: ${tryJsonStringify(run.inputs, '[inputs]')}`)