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From: Josh Steadmon <steadmon@google.com>
To: git@vger.kernel.org, gitster@pobox.com, git@jeffhostetler.com,
	avarab@gmail.com, peff@peff.net, jnareb@gmail.com
Subject: [RFC PATCH v2 2/3] trace2: add a schema validator for trace2 events
Date: Tue,  9 Jul 2019 16:05:44 -0700	[thread overview]
Message-ID: <3fa4e9eef84ba00c631c82fb3a2eacb8439df9e5.1562712943.git.steadmon@google.com> (raw)
In-Reply-To: <cover.1562712943.git.steadmon@google.com>

trace_schema_validator can be used to verify that trace2 event output
conforms to the expectations set by the API documentation and codified
in event_schema.json (or strict_schema.json). This allows us to build a
regression test to verify that trace2 output does not change
unexpectedly.

Signed-off-by: Josh Steadmon <steadmon@google.com>
---
 t/trace_schema_validator/.gitignore           |  1 +
 t/trace_schema_validator/Makefile             | 10 +++
 .../trace_schema_validator.go                 | 78 +++++++++++++++++++
 3 files changed, 89 insertions(+)
 create mode 100644 t/trace_schema_validator/.gitignore
 create mode 100644 t/trace_schema_validator/Makefile
 create mode 100644 t/trace_schema_validator/trace_schema_validator.go

diff --git a/t/trace_schema_validator/.gitignore b/t/trace_schema_validator/.gitignore
new file mode 100644
index 0000000000..c3f1e04e9e
--- /dev/null
+++ b/t/trace_schema_validator/.gitignore
@@ -0,0 +1 @@
+trace_schema_validator
diff --git a/t/trace_schema_validator/Makefile b/t/trace_schema_validator/Makefile
new file mode 100644
index 0000000000..ed22675e5d
--- /dev/null
+++ b/t/trace_schema_validator/Makefile
@@ -0,0 +1,10 @@
+.PHONY: fetch_deps clean
+
+trace_schema_validator: fetch_deps trace_schema_validator.go
+	go build
+
+fetch_deps:
+	go get github.com/xeipuuv/gojsonschema
+
+clean:
+	rm -f trace_schema_validator
diff --git a/t/trace_schema_validator/trace_schema_validator.go b/t/trace_schema_validator/trace_schema_validator.go
new file mode 100644
index 0000000000..f779ac5ff5
--- /dev/null
+++ b/t/trace_schema_validator/trace_schema_validator.go
@@ -0,0 +1,78 @@
+// trace_schema_validator validates individual lines of an input file against a
+// provided JSON-Schema for git trace2 event output.
+//
+// Traces can be collected by setting the GIT_TRACE2_EVENT environment variable
+// to an absolute path and running any Git command; traces will be appended to
+// the file.
+//
+// Traces can then be verified like so:
+//   trace_schema_validator \
+//     --trace2_event_file /path/to/trace/output \
+//     --schema_file /path/to/schema
+package main
+
+import (
+	"bufio"
+	"flag"
+	"log"
+	"os"
+	"path/filepath"
+
+	"github.com/xeipuuv/gojsonschema"
+)
+
+// Required flags
+var schemaFile = flag.String("schema_file", "", "JSON-Schema filename")
+var trace2EventFile = flag.String("trace2_event_file", "", "trace2 event filename")
+
+func main() {
+	flag.Parse()
+	if *schemaFile == "" || *trace2EventFile == "" {
+		log.Fatal("Both --schema_file and --trace2_event_file are required.")
+	}
+	schemaURI, err := filepath.Abs(*schemaFile)
+	if err != nil {
+		log.Fatal("Can't get absolute path for schema file: ", err)
+	}
+	schemaURI = "file://" + schemaURI
+
+	schemaLoader := gojsonschema.NewReferenceLoader(schemaURI)
+	schema, err := gojsonschema.NewSchema(schemaLoader)
+	if err != nil {
+		log.Fatal("Problem loading schema: ", err)
+	}
+
+	tracesFile, err := os.Open(*trace2EventFile)
+	if err != nil {
+		log.Fatal("Problem opening trace file: ", err)
+	}
+	defer tracesFile.Close()
+
+	scanner := bufio.NewScanner(tracesFile)
+
+	count := 0
+	for ; scanner.Scan(); count++ {
+		if count%10000 == 0 {
+			// Travis-CI expects regular output or it will time out.
+			log.Print("Validated items: ", count)
+		}
+		event := gojsonschema.NewStringLoader(scanner.Text())
+		result, err := schema.Validate(event)
+		if err != nil {
+			log.Fatal(err)
+		}
+		if !result.Valid() {
+			log.Print("Trace event is invalid: ", scanner.Text())
+			for _, desc := range result.Errors() {
+				log.Print("- ", desc)
+			}
+			os.Exit(1)
+		}
+	}
+
+	if err := scanner.Err(); err != nil {
+		log.Fatal("Scanning error: ", err)
+	}
+
+	log.Print("Validated events: ", count)
+}
-- 
2.22.0.510.g264f2c817a-goog


  parent reply	other threads:[~2019-07-09 23:05 UTC|newest]

Thread overview: 47+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-11 23:31 [RFC PATCH 0/3] Add a JSON Schema " Josh Steadmon
2019-06-11 23:31 ` [RFC PATCH 1/3] trace2: correct trace2 field name documentation Josh Steadmon
2019-06-12 18:00   ` Junio C Hamano
2019-06-12 18:14     ` Josh Steadmon
2019-06-14 15:53   ` Jeff Hostetler
2019-06-11 23:31 ` [RFC PATCH 2/3] trace2: Add a JSON schema for trace2 events Josh Steadmon
2019-06-14 15:59   ` Jeff Hostetler
2019-06-20 17:26     ` Josh Steadmon
2019-06-11 23:31 ` [RFC PATCH 3/3] trace2: add a schema validator " Josh Steadmon
2019-06-12 13:28   ` Ævar Arnfjörð Bjarmason
2019-06-12 16:23     ` Josh Steadmon
2019-06-12 19:18       ` Jeff King
2019-06-20 18:15         ` Josh Steadmon
2019-06-21 11:53       ` Jakub Narebski
2019-06-27 13:57         ` Jeff Hostetler
2019-07-09 23:05 ` [RFC PATCH v2 0/3] Add a JSON Schema " Josh Steadmon
2019-07-09 23:05   ` [RFC PATCH v2 1/3] trace2: Add a JSON schema " Josh Steadmon
2019-07-10 18:32     ` Jakub Narebski
2019-07-24 22:37       ` Josh Steadmon
2019-07-09 23:05   ` Josh Steadmon [this message]
2019-07-11 13:35     ` [RFC PATCH v2 2/3] trace2: add a schema validator " Jakub Narebski
2019-07-24 22:47       ` Josh Steadmon
2019-07-09 23:05   ` [RFC PATCH v2 3/3] ci: run trace2 schema validation in the CI suite Josh Steadmon
2019-07-24 23:06 ` [PATCH v3 0/3] Add a JSON Schema for trace2 events Josh Steadmon
2019-07-24 23:06   ` [PATCH v3 1/3] trace2: Add a JSON schema " Josh Steadmon
2019-07-25 16:55     ` Junio C Hamano
2019-07-24 23:06   ` [PATCH v3 2/3] trace2: add a schema validator " Josh Steadmon
2019-07-24 23:06   ` [PATCH v3 3/3] ci: run trace2 schema validation in the CI suite Josh Steadmon
2019-07-25 11:18   ` [PATCH v3 0/3] Add a JSON Schema for trace2 events SZEDER Gábor
2019-07-25 16:14     ` Junio C Hamano
2019-07-26 21:16       ` Josh Steadmon
2019-07-25 23:42   ` SZEDER Gábor
2019-07-26 12:12     ` Johannes Schindelin
2019-07-26 13:53       ` SZEDER Gábor
2019-07-31 11:00         ` Johannes Schindelin
2019-07-26 22:03       ` Josh Steadmon
2019-08-01 18:08         ` Josh Steadmon
2019-08-02  1:52           ` Jonathan Nieder
2019-08-02 11:56             ` Johannes Schindelin
2019-08-02 16:59               ` Jonathan Nieder
2019-08-02 19:38                 ` SZEDER Gábor
2019-08-02 23:25                   ` Jonathan Nieder
2019-08-03 21:25                     ` Johannes Schindelin
2019-08-02 19:16             ` SZEDER Gábor
2019-08-02 23:06               ` Jonathan Nieder
2019-08-03  7:35                 ` SZEDER Gábor
2019-08-03  7:40                   ` SZEDER Gábor

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