Add a config option to limit the max amount of characters for a value shown in error messages

CHANGELOG.md

@@ -12,6 +12,7 @@
 
 1. Slow uniqueness check (> 2hrs for 100k samples) made 400x faster by switching from `findAll` to a `subMap` for isolating the required unique fields.
 2. `patternProperties` now has greater support, with no warnings about invalid parameters which actually match a pattern
+3. Added a new configuration option: `validation.maxValueLength` which sets the maximum length that a value in an error message can be. The default is set to 150 characters.
 
 ## Changes
 

docs/configuration/configuration.md

@@ -95,6 +95,18 @@ This option does exactly the same as `validation.ignoreParams`, but provides pip
 validation.defaultIgnoreParams = ["param1", "param2"] // default: []
 ```
 
+## maxValueLength
+
+Configure the maximum characters of a value that may be shown in an error message. It takes a whole number above or equal to `0`. A value will be truncated when it goes over the maximum amount of characters. See the below example where the limit is to 20 characters:
+
+```
+* --test (abcdefghij...qrstuvwxyz): Value is [string] but should be [integer]
+```
+
+```groovy
+validation.maxValueLength = 100 // default: 150
+```
+
 ## help
 
 The `validation.help` config scope can be used to configure the creation of the help message.

plugins/nf-schema/src/main/nextflow/validation/config/ValidationConfig.groovy

@@ -20,18 +20,20 @@ class ValidationConfig {
     final public Boolean failUnrecognisedHeaders
     final public String  parametersSchema
     final public Boolean showHiddenParams
+    final public Integer maxValueLength
     final public HelpConfig help
     final public SummaryConfig summary
 
     final public List<String> ignoreParams
 
     ValidationConfig(Map map, Map params){
         def config = map ?: Collections.emptyMap()
-        lenientMode             = config.lenientMode                ?: false
-        monochromeLogs          = config.monochromeLogs             ?: false
-        failUnrecognisedParams  = config.failUnrecognisedParams     ?: false
-        failUnrecognisedHeaders = config.failUnrecognisedHeaders    ?: false
-        showHiddenParams        = config.showHiddenParams           ?: false
+        lenientMode             = config.lenientMode                                    ?: false
+        monochromeLogs          = config.monochromeLogs                                 ?: false
+        failUnrecognisedParams  = config.failUnrecognisedParams                         ?: false
+        failUnrecognisedHeaders = config.failUnrecognisedHeaders                        ?: false
+        showHiddenParams        = config.showHiddenParams                               ?: false
+        maxValueLength          = config.maxValueLength && config.maxValueLength >= 0   ? config.maxValueLength : 150
         if(config.containsKey("showHiddenParams")) {
             log.warn("configuration option `validation.showHiddenParams` is deprecated, please use `validation.help.showHidden` or the `--showHidden` parameter instead")
         }

plugins/nf-schema/src/main/nextflow/validation/validators/JsonSchemaValidator.groovy

@@ -65,6 +65,9 @@ public class JsonSchemaValidator {
 
             def String instanceLocation = error.getInstanceLocation()
             def String value = getValueFromJsonPointer(instanceLocation, rawJson)
+            if(value.size() > config.maxValueLength) {
+                value = "${value[0..(config.maxValueLength/2-1)]}...${value[-config.maxValueLength/2..-1]}" as String
+            }
 
             // Get the custom errorMessage if there is one and the validation errors are not about the content of the file
             def String schemaLocation = error.getSchemaLocation().replaceFirst(/^[^#]+/, "")

plugins/nf-schema/src/test/nextflow/validation/ValidateParametersTest.groovy

@@ -1409,4 +1409,30 @@ class ValidateParametersTest extends Dsl2Spec{
         !stdout
     }
 
+    def 'should truncate long values in errors' () {
+        given:
+        def schema = Path.of('src/testResources/nextflow_schema.json').toAbsolutePath().toString()
+        def SCRIPT = """
+            params.input = 'src/testResources/wrong_samplesheet_with_a_super_long_name.and_a_weird_extension'
+            params.outdir = 'src/testResources/testDir'
+            include { validateParameters } from 'plugin/nf-schema'
+
+            validateParameters(parameters_schema: '$schema')
+        """
+
+        when:
+        def config = ["validation": [
+            "maxValueLength": 20
+        ]]
+        def result = new MockScriptRunner(config).setScript(SCRIPT).execute()
+        def stdout = capture
+                .toString()
+                .readLines()
+                .findResults {it.contains('WARN nextflow.validation.SchemaValidator') || it.startsWith('* --') ? it : null }
+
+        then:
+        def error = thrown(SchemaValidationException)
+        error.message.contains("* --input (src/testRe..._extension): \"src/testResources/wrong_samplesheet_with_a_super_long_name.and_a_weird_extension\" does not match regular expression [^\\S+\\.(csv|tsv|yaml|json)\$]")
+        !stdout
+    }
 }