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error_writer_test.go
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package integration
import (
"fmt"
"io"
"os"
. "github.com/onsi/ginkgo/v2"
. "github.com/onsi/gomega"
. "github.com/onsi/gomega/gbytes"
. "github.com/onsi/gomega/gexec"
)
var _ = Describe("Error Writers", func() {
const (
hostname = "error-writers.cloudfoundry.org"
)
var (
testState *testState
statusCode int
body []byte
doRequest = func() {
req := testState.newGetRequest(fmt.Sprintf("http://not-%s", hostname))
resp, err := testState.client.Do(req)
Expect(err).NotTo(HaveOccurred())
statusCode = resp.StatusCode
body, err = io.ReadAll(resp.Body)
Expect(err).NotTo(HaveOccurred())
resp.Body.Close()
}
)
BeforeEach(func() {
testState = NewTestState()
})
AfterEach(func() {
testState.StopAndCleanup()
})
Context("when using plaintext error writer", func() {
BeforeEach(func() {
})
JustBeforeEach(func() {
testState.StartGorouterOrFail()
})
BeforeEach(func() {
testState.cfg.HTMLErrorTemplateFile = ""
})
It("responds with a plaintext error message", func() {
doRequest()
Expect(statusCode).To(Equal(404))
Expect(string(body)).To(Equal(fmt.Sprintf(
"404 Not Found: Requested route ('not-%s') does not exist.\n",
hostname,
)))
})
})
Context("when using HTML error writer", func() {
Context("when the template does not exist", func() {
BeforeEach(func() {
testState.cfg.HTMLErrorTemplateFile = "/path/to/non/file"
})
It("should log a fatal error", func() {
session := testState.StartGorouter()
Eventually(session).Should(Say("Could not read HTML error template file"))
Eventually(session).Should(Say("/path/to/non/file"))
Eventually(session).Should(Exit())
Expect(session.ExitCode()).To(Equal(1))
})
})
Context("when the template exists", func() {
var (
tmpFile *os.File
)
BeforeEach(func() {
tpl := `<html><body>{{ .Message }}</body></html>`
var err error
tmpFile, err = os.CreateTemp(os.TempDir(), "html-err-tpl")
Expect(err).NotTo(HaveOccurred())
testState.cfg.HTMLErrorTemplateFile = tmpFile.Name()
_, err = tmpFile.Write([]byte(tpl))
Expect(err).NotTo(HaveOccurred())
})
JustBeforeEach(func() {
testState.StartGorouterOrFail()
})
AfterEach(func() {
os.Remove(tmpFile.Name())
})
It("responds with a templated error message", func() {
doRequest()
Expect(statusCode).To(Equal(404))
Expect(string(body)).To(Equal(fmt.Sprintf(
"<html><body>Requested route ('not-%s') does not exist.</body></html>",
hostname,
)))
})
})
Context("when the template references an HTTP header", func() {
var (
tmpFile *os.File
)
BeforeEach(func() {
tpl := `<html><body>Code: {{ .Status }} ; Cause: {{ .Header.Get "X-Cf-RouterError" }}</body></html>`
var err error
tmpFile, err = os.CreateTemp(os.TempDir(), "html-err-tpl")
Expect(err).NotTo(HaveOccurred())
testState.cfg.HTMLErrorTemplateFile = tmpFile.Name()
_, err = tmpFile.Write([]byte(tpl))
Expect(err).NotTo(HaveOccurred())
})
JustBeforeEach(func() {
testState.StartGorouterOrFail()
})
AfterEach(func() {
os.Remove(tmpFile.Name())
})
It("responds with a templated error message", func() {
doRequest()
Expect(statusCode).To(Equal(404))
Expect(string(body)).To(ContainSubstring("Code: 404"))
Expect(string(body)).To(ContainSubstring("Cause: unknown_route"))
})
})
})
})