Ben KraftandGitHub
65c3e20ee6
## Summary:
There were a few bugs here, one of which Craig came across when pulling
the custom-unmarshaler change into webapp:
1. If you have an optional field with a custom unmarshaler, and the
server omits the field from the response entirely (i.e. does not
write `"myField": null`), we would still call your unmarshaler with
an input of `[]byte(nil)`. This is just wrong; it's our job to do
the nil-check. (This is the one Craig found; in practice gqlgen
servers do not do this and I think the spec says not to although it's
a bit fuzzy on the matter of serialization. But in practice we have
mocks that do it -- for required fields even! -- and it seems better
to handle it than pass you data on which you'll probably err or even
panic.)
2. If you have an optional field with a custom unmarshaler, and the
server returns an explicit null (i.e. `"myField": null`), we would
call your unmarshaler with `[]byte("null")`. In principle the intent
was you're supposed to implement that, as [`json.Unmarshaler`
advises][1]. But (a) I forgot to document that, and (b) in practice
`json.Unmarshal` [does *not* call you in that case][2], i.e. its
advice is unnecessary. So I think it's better for us to just match
it, and not call you. (And in that case I see no reason to bother
documenting the advice.)
3. If you have an optional, `pointer: true` field with a custom
marshaler, the reverse of (2) applies: if the pointer is nil, we
shouldn't really call you. (Indeed if you were a real
`json.Marshaler` with a value-method rather than a pointer-method,
trying to call you might panic!) Note we don't need to explicitly
write "null"; we just leave the `json.RawMessage` as nil, and
`json.Marshal` [handles that][3].
4. We handle interface types effectively the same as custom
unmarshalers, just we generate the unmarshaler. So if you have an
optional field with interface type, (1) would also apply there; our
generated unmarshaler returns an error in this case.
5. While (2) doesn't apply to such optional interface fields (because we
do the customary `if string(b) == "null"` check -- this I at least
thought to test), if you set `pointer: true` on the field, we would
still call the unmarshaler on the value, and it would no-op, but only
*after* we initialized the pointer. Put more simply, we'd return a
non-nil pointer to nil interface, rather than a nil pointer; this is
wrong since the whole point of `pointer: true` is you only get a
non-nil pointer if your value is nil! Of course, in practice there's
little reason to use `pointer: true` on interface fields, and indeed
this stuff gets so confusing my test was even wrong.
In this commit I fix all the bugs, by adding appropriate nil-checks to
wrap the unmarshaler-calls. The templates are, as always, a bit
confusing, but the generated code makes it clear what changed.
Note we'll want to land this before cutting a release with custom
marshaler/unmarshaler support, because the first three bugs are
potentially quite noticeable. (The latter two are in `v0.1.0`, but
presumably quite rare.)
[1]: https://pkg.go.dev/encoding/json#Unmarshaler
[2]: https://play.golang.org/p/Pw6zNN8trGO
[3]: https://play.golang.org/p/crTfnT7ePte
Issue: https://phabricator.khanacademy.org/D74453#inline-558571
## Test plan:
make tesc
Author: benjaminjkraft
Reviewers: csilvers, StevenACoffman, benjaminjkraft, aberkan, dnerdy, jvoll, mahtabsabet, MiguelCastillo
Required Reviewers:
Approved By: csilvers, StevenACoffman
Checks: ✅ Test (1.17), ✅ Test (1.16), ✅ Test (1.15), ✅ Test (1.14), ✅ Lint, ✅ Test (1.17), ✅ Test (1.16), ✅ Test (1.15), ✅ Test (1.14), ✅ Lint
Pull Request URL: https://github.com/Khan/genqlient/pull/116
560 lines
17 KiB
Go
560 lines
17 KiB
Go
// Package integration contains genqlient's integration tests, which run
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// against a real server (defined in internal/integration/server/server.go).
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//
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// These are especially important for cases where we generate nontrivial logic,
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// such as JSON-unmarshaling.
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package integration
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import (
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"context"
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"net/http"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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"github.com/Khan/genqlient/graphql"
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"github.com/Khan/genqlient/internal/integration/server"
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)
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func TestSimpleQuery(t *testing.T) {
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_ = `# @genqlient
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query simpleQuery { me { id name luckyNumber } }`
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ctx := context.Background()
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server := server.RunServer()
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defer server.Close()
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client := graphql.NewClient(server.URL, http.DefaultClient)
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resp, err := simpleQuery(ctx, client)
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require.NoError(t, err)
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assert.Equal(t, "1", resp.Me.Id)
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assert.Equal(t, "Yours Truly", resp.Me.Name)
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assert.Equal(t, 17, resp.Me.LuckyNumber)
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}
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func TestServerError(t *testing.T) {
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_ = `# @genqlient
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query failingQuery { fail me { id } }`
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ctx := context.Background()
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server := server.RunServer()
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defer server.Close()
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client := graphql.NewClient(server.URL, http.DefaultClient)
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resp, err := failingQuery(ctx, client)
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// As long as we get some response back, we should still return a full
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// response -- and indeed in this case it should even have another field
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// (which didn't err) set.
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assert.Error(t, err)
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assert.NotNil(t, resp)
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assert.Equal(t, "1", resp.Me.Id)
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}
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func TestNetworkError(t *testing.T) {
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ctx := context.Background()
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client := graphql.NewClient("https://nothing.invalid/graphql", http.DefaultClient)
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resp, err := failingQuery(ctx, client)
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// As we guarantee in the README, even on network error you always get a
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// non-nil response; this is so you can write e.g.
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// resp, err := failingQuery(ctx)
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// return resp.Me.Id, err
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// without a bunch of extra ceremony.
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assert.Error(t, err)
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assert.NotNil(t, resp)
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assert.Equal(t, new(failingQueryResponse), resp)
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}
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func TestVariables(t *testing.T) {
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_ = `# @genqlient
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query queryWithVariables($id: ID!) { user(id: $id) { id name luckyNumber } }`
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ctx := context.Background()
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server := server.RunServer()
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defer server.Close()
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client := graphql.NewClient(server.URL, http.DefaultClient)
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resp, err := queryWithVariables(ctx, client, "2")
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require.NoError(t, err)
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assert.Equal(t, "2", resp.User.Id)
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assert.Equal(t, "Raven", resp.User.Name)
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assert.Equal(t, -1, resp.User.LuckyNumber)
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resp, err = queryWithVariables(ctx, client, "374892379482379")
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require.NoError(t, err)
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assert.Zero(t, resp.User)
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}
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func TestOmitempty(t *testing.T) {
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_ = `# @genqlient(omitempty: true)
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query queryWithOmitempty($id: ID) {
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user(id: $id) { id name luckyNumber }
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}`
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ctx := context.Background()
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server := server.RunServer()
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defer server.Close()
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client := graphql.NewClient(server.URL, http.DefaultClient)
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resp, err := queryWithOmitempty(ctx, client, "2")
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require.NoError(t, err)
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assert.Equal(t, "2", resp.User.Id)
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assert.Equal(t, "Raven", resp.User.Name)
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assert.Equal(t, -1, resp.User.LuckyNumber)
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// should return default user, not the user with ID ""
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resp, err = queryWithOmitempty(ctx, client, "")
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require.NoError(t, err)
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assert.Equal(t, "1", resp.User.Id)
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assert.Equal(t, "Yours Truly", resp.User.Name)
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assert.Equal(t, 17, resp.User.LuckyNumber)
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}
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func TestCustomMarshal(t *testing.T) {
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_ = `# @genqlient
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query queryWithCustomMarshal($date: Date!) {
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usersBornOn(date: $date) { id name birthdate }
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}`
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ctx := context.Background()
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server := server.RunServer()
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defer server.Close()
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client := graphql.NewClient(server.URL, http.DefaultClient)
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resp, err := queryWithCustomMarshal(ctx, client,
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time.Date(2025, time.January, 1, 12, 34, 56, 789, time.UTC))
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require.NoError(t, err)
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assert.Len(t, resp.UsersBornOn, 1)
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user := resp.UsersBornOn[0]
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assert.Equal(t, "1", user.Id)
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assert.Equal(t, "Yours Truly", user.Name)
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assert.Equal(t,
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time.Date(2025, time.January, 1, 0, 0, 0, 0, time.UTC),
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user.Birthdate)
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resp, err = queryWithCustomMarshal(ctx, client,
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time.Date(2021, time.January, 1, 12, 34, 56, 789, time.UTC))
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require.NoError(t, err)
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assert.Len(t, resp.UsersBornOn, 0)
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}
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func TestCustomMarshalSlice(t *testing.T) {
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_ = `# @genqlient
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query queryWithCustomMarshalSlice($dates: [Date!]!) {
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usersBornOnDates(dates: $dates) { id name birthdate }
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}`
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ctx := context.Background()
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server := server.RunServer()
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defer server.Close()
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client := graphql.NewClient(server.URL, http.DefaultClient)
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resp, err := queryWithCustomMarshalSlice(ctx, client,
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[]time.Time{time.Date(2025, time.January, 1, 12, 34, 56, 789, time.UTC)})
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require.NoError(t, err)
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assert.Len(t, resp.UsersBornOnDates, 1)
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user := resp.UsersBornOnDates[0]
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assert.Equal(t, "1", user.Id)
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assert.Equal(t, "Yours Truly", user.Name)
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assert.Equal(t,
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time.Date(2025, time.January, 1, 0, 0, 0, 0, time.UTC),
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user.Birthdate)
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resp, err = queryWithCustomMarshalSlice(ctx, client,
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[]time.Time{time.Date(2021, time.January, 1, 12, 34, 56, 789, time.UTC)})
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require.NoError(t, err)
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assert.Len(t, resp.UsersBornOnDates, 0)
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}
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func TestCustomMarshalOptional(t *testing.T) {
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_ = `# @genqlient
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query queryWithCustomMarshalOptional(
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# @genqlient(pointer: true)
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$date: Date,
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# @genqlient(pointer: true)
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$id: ID,
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) {
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userSearch(birthdate: $date, id: $id) { id name birthdate }
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}`
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ctx := context.Background()
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server := server.RunServer()
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defer server.Close()
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client := graphql.NewClient(server.URL, http.DefaultClient)
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date := time.Date(2025, time.January, 1, 12, 34, 56, 789, time.UTC)
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resp, err := queryWithCustomMarshalOptional(ctx, client, &date, nil)
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require.NoError(t, err)
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assert.Len(t, resp.UserSearch, 1)
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user := resp.UserSearch[0]
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assert.Equal(t, "1", user.Id)
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assert.Equal(t, "Yours Truly", user.Name)
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assert.Equal(t,
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time.Date(2025, time.January, 1, 0, 0, 0, 0, time.UTC),
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user.Birthdate)
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id := "2"
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resp, err = queryWithCustomMarshalOptional(ctx, client, nil, &id)
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require.NoError(t, err)
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assert.Len(t, resp.UserSearch, 1)
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user = resp.UserSearch[0]
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assert.Equal(t, "2", user.Id)
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assert.Equal(t, "Raven", user.Name)
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assert.Zero(t, user.Birthdate)
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}
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func TestInterfaceNoFragments(t *testing.T) {
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_ = `# @genqlient
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query queryWithInterfaceNoFragments($id: ID!) {
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being(id: $id) { id name }
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me { id name }
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}`
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ctx := context.Background()
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server := server.RunServer()
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defer server.Close()
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client := graphql.NewClient(server.URL, http.DefaultClient)
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resp, err := queryWithInterfaceNoFragments(ctx, client, "1")
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require.NoError(t, err)
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// We should get the following response:
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// me: User{Id: 1, Name: "Yours Truly"},
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// being: User{Id: 1, Name: "Yours Truly"},
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assert.Equal(t, "1", resp.Me.Id)
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assert.Equal(t, "Yours Truly", resp.Me.Name)
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// Check fields both via interface and via type-assertion:
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assert.Equal(t, "User", resp.Being.GetTypename())
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assert.Equal(t, "1", resp.Being.GetId())
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assert.Equal(t, "Yours Truly", resp.Being.GetName())
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user, ok := resp.Being.(*queryWithInterfaceNoFragmentsBeingUser)
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require.Truef(t, ok, "got %T, not User", resp.Being)
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assert.Equal(t, "1", user.Id)
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assert.Equal(t, "Yours Truly", user.Name)
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resp, err = queryWithInterfaceNoFragments(ctx, client, "3")
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require.NoError(t, err)
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// We should get the following response:
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// me: User{Id: 1, Name: "Yours Truly"},
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// being: Animal{Id: 3, Name: "Fido"},
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assert.Equal(t, "1", resp.Me.Id)
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assert.Equal(t, "Yours Truly", resp.Me.Name)
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assert.Equal(t, "Animal", resp.Being.GetTypename())
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assert.Equal(t, "3", resp.Being.GetId())
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assert.Equal(t, "Fido", resp.Being.GetName())
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animal, ok := resp.Being.(*queryWithInterfaceNoFragmentsBeingAnimal)
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require.Truef(t, ok, "got %T, not Animal", resp.Being)
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assert.Equal(t, "3", animal.Id)
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assert.Equal(t, "Fido", animal.Name)
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resp, err = queryWithInterfaceNoFragments(ctx, client, "4757233945723")
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require.NoError(t, err)
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// We should get the following response:
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// me: User{Id: 1, Name: "Yours Truly"},
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// being: null
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assert.Equal(t, "1", resp.Me.Id)
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assert.Equal(t, "Yours Truly", resp.Me.Name)
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assert.Nil(t, resp.Being)
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}
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func TestInterfaceListField(t *testing.T) {
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_ = `# @genqlient
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query queryWithInterfaceListField($ids: [ID!]!) {
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beings(ids: $ids) { id name }
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}`
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ctx := context.Background()
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server := server.RunServer()
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defer server.Close()
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client := graphql.NewClient(server.URL, http.DefaultClient)
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resp, err := queryWithInterfaceListField(ctx, client,
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[]string{"1", "3", "12847394823"})
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require.NoError(t, err)
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require.Len(t, resp.Beings, 3)
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// We should get the following three beings:
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// User{Id: 1, Name: "Yours Truly"},
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// Animal{Id: 3, Name: "Fido"},
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// null
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// Check fields both via interface and via type-assertion:
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assert.Equal(t, "User", resp.Beings[0].GetTypename())
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assert.Equal(t, "1", resp.Beings[0].GetId())
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assert.Equal(t, "Yours Truly", resp.Beings[0].GetName())
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user, ok := resp.Beings[0].(*queryWithInterfaceListFieldBeingsUser)
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require.Truef(t, ok, "got %T, not User", resp.Beings[0])
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assert.Equal(t, "1", user.Id)
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assert.Equal(t, "Yours Truly", user.Name)
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assert.Equal(t, "Animal", resp.Beings[1].GetTypename())
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assert.Equal(t, "3", resp.Beings[1].GetId())
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assert.Equal(t, "Fido", resp.Beings[1].GetName())
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animal, ok := resp.Beings[1].(*queryWithInterfaceListFieldBeingsAnimal)
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require.Truef(t, ok, "got %T, not Animal", resp.Beings[1])
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assert.Equal(t, "3", animal.Id)
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assert.Equal(t, "Fido", animal.Name)
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assert.Nil(t, resp.Beings[2])
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}
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func TestInterfaceListPointerField(t *testing.T) {
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_ = `# @genqlient
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query queryWithInterfaceListPointerField($ids: [ID!]!) {
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# @genqlient(pointer: true)
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beings(ids: $ids) {
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__typename id name
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}
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}`
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ctx := context.Background()
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server := server.RunServer()
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defer server.Close()
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client := graphql.NewClient(server.URL, http.DefaultClient)
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resp, err := queryWithInterfaceListPointerField(ctx, client,
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[]string{"1", "3", "12847394823"})
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require.NoError(t, err)
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require.Len(t, resp.Beings, 3)
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// Check fields both via interface and via type-assertion:
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assert.Equal(t, "User", (*resp.Beings[0]).GetTypename())
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assert.Equal(t, "1", (*resp.Beings[0]).GetId())
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assert.Equal(t, "Yours Truly", (*resp.Beings[0]).GetName())
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user, ok := (*resp.Beings[0]).(*queryWithInterfaceListPointerFieldBeingsUser)
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require.Truef(t, ok, "got %T, not User", *resp.Beings[0])
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assert.Equal(t, "1", user.Id)
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assert.Equal(t, "Yours Truly", user.Name)
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assert.Equal(t, "Animal", (*resp.Beings[1]).GetTypename())
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assert.Equal(t, "3", (*resp.Beings[1]).GetId())
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assert.Equal(t, "Fido", (*resp.Beings[1]).GetName())
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animal, ok := (*resp.Beings[1]).(*queryWithInterfaceListPointerFieldBeingsAnimal)
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require.Truef(t, ok, "got %T, not Animal", resp.Beings[1])
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assert.Equal(t, "3", animal.Id)
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assert.Equal(t, "Fido", animal.Name)
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assert.Nil(t, resp.Beings[2])
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}
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func TestFragments(t *testing.T) {
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_ = `# @genqlient
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query queryWithFragments($ids: [ID!]!) {
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beings(ids: $ids) {
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__typename id
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... on Being { id name }
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... on Animal {
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id
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hair { hasHair }
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species
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owner {
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id
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... on Being { name }
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... on User { luckyNumber }
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}
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}
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... on Lucky { luckyNumber }
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... on User { hair { color } }
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}
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}`
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ctx := context.Background()
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server := server.RunServer()
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defer server.Close()
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client := graphql.NewClient(server.URL, http.DefaultClient)
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resp, err := queryWithFragments(ctx, client, []string{"1", "3", "12847394823"})
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require.NoError(t, err)
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require.Len(t, resp.Beings, 3)
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// We should get the following three beings:
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// User{Id: 1, Name: "Yours Truly"},
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// Animal{Id: 3, Name: "Fido"},
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// null
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// Check fields both via interface and via type-assertion when possible
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// User has, in total, the fields: __typename id name luckyNumber.
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assert.Equal(t, "User", resp.Beings[0].GetTypename())
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assert.Equal(t, "1", resp.Beings[0].GetId())
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assert.Equal(t, "Yours Truly", resp.Beings[0].GetName())
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// (hair and luckyNumber we need to cast for)
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user, ok := resp.Beings[0].(*queryWithFragmentsBeingsUser)
|
|
require.Truef(t, ok, "got %T, not User", resp.Beings[0])
|
|
assert.Equal(t, "1", user.Id)
|
|
assert.Equal(t, "Yours Truly", user.Name)
|
|
assert.Equal(t, "Black", user.Hair.Color)
|
|
assert.Equal(t, 17, user.LuckyNumber)
|
|
|
|
// Animal has, in total, the fields:
|
|
// __typename
|
|
// id
|
|
// species
|
|
// owner {
|
|
// id
|
|
// name
|
|
// ... on User { luckyNumber }
|
|
// }
|
|
assert.Equal(t, "Animal", resp.Beings[1].GetTypename())
|
|
assert.Equal(t, "3", resp.Beings[1].GetId())
|
|
// (hair, species, and owner.* we have to cast for)
|
|
|
|
animal, ok := resp.Beings[1].(*queryWithFragmentsBeingsAnimal)
|
|
require.Truef(t, ok, "got %T, not Animal", resp.Beings[1])
|
|
assert.Equal(t, "3", animal.Id)
|
|
assert.Equal(t, SpeciesDog, animal.Species)
|
|
assert.True(t, animal.Hair.HasHair)
|
|
|
|
assert.Equal(t, "1", animal.Owner.GetId())
|
|
assert.Equal(t, "Yours Truly", animal.Owner.GetName())
|
|
// (luckyNumber we have to cast for, again)
|
|
|
|
owner, ok := animal.Owner.(*queryWithFragmentsBeingsAnimalOwnerUser)
|
|
require.Truef(t, ok, "got %T, not User", animal.Owner)
|
|
assert.Equal(t, "1", owner.Id)
|
|
assert.Equal(t, "Yours Truly", owner.Name)
|
|
assert.Equal(t, 17, owner.LuckyNumber)
|
|
|
|
assert.Nil(t, resp.Beings[2])
|
|
}
|
|
|
|
func TestNamedFragments(t *testing.T) {
|
|
_ = `# @genqlient
|
|
fragment AnimalFields on Animal {
|
|
id
|
|
hair { hasHair }
|
|
owner { id ...UserFields ...LuckyFields }
|
|
}
|
|
|
|
fragment MoreUserFields on User {
|
|
id
|
|
hair { color }
|
|
}
|
|
|
|
fragment LuckyFields on Lucky {
|
|
...MoreUserFields
|
|
luckyNumber
|
|
}
|
|
|
|
fragment UserFields on User {
|
|
id
|
|
...LuckyFields
|
|
...MoreUserFields
|
|
}
|
|
|
|
query queryWithNamedFragments($ids: [ID!]!) {
|
|
beings(ids: $ids) {
|
|
__typename id
|
|
...AnimalFields
|
|
...UserFields
|
|
}
|
|
}`
|
|
|
|
ctx := context.Background()
|
|
server := server.RunServer()
|
|
defer server.Close()
|
|
client := graphql.NewClient(server.URL, http.DefaultClient)
|
|
|
|
resp, err := queryWithNamedFragments(ctx, client, []string{"1", "3", "12847394823"})
|
|
require.NoError(t, err)
|
|
|
|
require.Len(t, resp.Beings, 3)
|
|
|
|
// We should get the following three beings:
|
|
// User{Id: 1, Name: "Yours Truly"},
|
|
// Animal{Id: 3, Name: "Fido"},
|
|
// null
|
|
|
|
// Check fields both via interface and via type-assertion when possible
|
|
// User has, in total, the fields: __typename id luckyNumber.
|
|
assert.Equal(t, "User", resp.Beings[0].GetTypename())
|
|
assert.Equal(t, "1", resp.Beings[0].GetId())
|
|
// (luckyNumber, hair we need to cast for)
|
|
|
|
user, ok := resp.Beings[0].(*queryWithNamedFragmentsBeingsUser)
|
|
require.Truef(t, ok, "got %T, not User", resp.Beings[0])
|
|
assert.Equal(t, "1", user.Id)
|
|
assert.Equal(t, "1", user.UserFields.Id)
|
|
assert.Equal(t, "1", user.UserFields.MoreUserFields.Id)
|
|
assert.Equal(t, "1", user.UserFields.LuckyFieldsUser.MoreUserFields.Id)
|
|
// on UserFields, but we should be able to access directly via embedding:
|
|
assert.Equal(t, 17, user.LuckyNumber)
|
|
assert.Equal(t, "Black", user.Hair.Color)
|
|
assert.Equal(t, "Black", user.UserFields.MoreUserFields.Hair.Color)
|
|
assert.Equal(t, "Black", user.UserFields.LuckyFieldsUser.MoreUserFields.Hair.Color)
|
|
|
|
// Animal has, in total, the fields:
|
|
// __typename
|
|
// id
|
|
// hair { hasHair }
|
|
// owner { id luckyNumber }
|
|
assert.Equal(t, "Animal", resp.Beings[1].GetTypename())
|
|
assert.Equal(t, "3", resp.Beings[1].GetId())
|
|
// (hair.* and owner.* we have to cast for)
|
|
|
|
animal, ok := resp.Beings[1].(*queryWithNamedFragmentsBeingsAnimal)
|
|
require.Truef(t, ok, "got %T, not Animal", resp.Beings[1])
|
|
// Check that we filled in *both* ID fields:
|
|
assert.Equal(t, "3", animal.Id)
|
|
assert.Equal(t, "3", animal.AnimalFields.Id)
|
|
// on AnimalFields:
|
|
assert.True(t, animal.Hair.HasHair)
|
|
assert.Equal(t, "1", animal.Owner.GetId())
|
|
// (luckyNumber we have to cast for, again)
|
|
|
|
owner, ok := animal.Owner.(*AnimalFieldsOwnerUser)
|
|
require.Truef(t, ok, "got %T, not User", animal.Owner)
|
|
// Check that we filled in *both* ID fields:
|
|
assert.Equal(t, "1", owner.Id)
|
|
assert.Equal(t, "1", owner.UserFields.Id)
|
|
assert.Equal(t, "1", owner.UserFields.MoreUserFields.Id)
|
|
assert.Equal(t, "1", owner.UserFields.LuckyFieldsUser.MoreUserFields.Id)
|
|
// on UserFields:
|
|
assert.Equal(t, 17, owner.LuckyNumber)
|
|
assert.Equal(t, "Black", owner.UserFields.MoreUserFields.Hair.Color)
|
|
assert.Equal(t, "Black", owner.UserFields.LuckyFieldsUser.MoreUserFields.Hair.Color)
|
|
|
|
// Lucky-based fields we can also get by casting to the fragment-interface.
|
|
luckyOwner, ok := animal.Owner.(LuckyFields)
|
|
require.Truef(t, ok, "got %T, not Lucky", animal.Owner)
|
|
assert.Equal(t, 17, luckyOwner.GetLuckyNumber())
|
|
|
|
assert.Nil(t, resp.Beings[2])
|
|
}
|
|
|
|
func TestGeneratedCode(t *testing.T) {
|
|
// TODO(benkraft): Check that gqlgen is up to date too. In practice that's
|
|
// less likely to be a problem, since it should only change if you update
|
|
// the schema, likely too add something new, in which case you'll notice.
|
|
RunGenerateTest(t, "internal/integration/genqlient.yaml")
|
|
}
|
|
|
|
//go:generate go run github.com/Khan/genqlient genqlient.yaml
|