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dgraph.go
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dgraph.go
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package dgraphdockerhelper
import (
"bytes"
"context"
"encoding/json"
"fmt"
"net"
"net/http"
"strings"
"testing"
"time"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/client"
"github.com/docker/go-connections/nat"
"github.com/test-go/testify/require"
)
const (
DefaultDgraphImage = "dgraph/standalone:v21.03.2"
)
type DgraphConfig struct {
Port int
ContainerID string
}
func (cfg *DgraphConfig) GetURL() string {
return fmt.Sprintf("http://localhost:%d", cfg.Port)
}
// DgraphStart creates and starts a dgraph container. You can specify a
// specific `image`. The image must be in your Docker cache (docker pull <image-name>).
func DgraphStart(t *testing.T, image string) *DgraphConfig {
var (
err error
config DgraphConfig
)
t.Log("Starting dgraph container")
if image == "" {
image = DefaultDgraphImage
}
require := require.New(t)
config.Port, err = getFreePort()
require.NoError(err)
cli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
require.NoError(err)
env := []string{}
cfg := &container.Config{
Image: image,
Env: env,
ExposedPorts: nat.PortSet{
nat.Port(fmt.Sprintf("%d/tcp", config.Port)): struct{}{},
},
}
hostConfig := &container.HostConfig{
PortBindings: nat.PortMap{
"8080/tcp": []nat.PortBinding{
{
HostIP: "0.0.0.0",
HostPort: fmt.Sprintf("%d", config.Port),
},
},
},
}
cont, err := cli.ContainerCreate(
context.Background(),
cfg,
hostConfig,
nil,
nil,
"",
)
require.NoError(err)
err = cli.ContainerStart(context.Background(), cont.ID, types.ContainerStartOptions{})
require.NoError(err)
config.ContainerID = cont.ID
// Wait for the container to start
time.Sleep(time.Second * 1)
// Wait for it to be ready
for i := 0; i < 30; i++ {
resp, err := http.Get(config.GetURL())
if err == nil && resp.StatusCode == http.StatusOK {
break
}
time.Sleep(time.Second)
}
return &config
}
// DgraphStop stops and removes a Dgraph container.
func DgraphStop(t *testing.T, config *DgraphConfig) {
t.Log("Stopping and removing dgraph container")
cli, err := client.NewClientWithOpts(client.FromEnv, client.WithAPIVersionNegotiation())
require.NoError(t, err)
err = cli.ContainerStop(context.Background(), config.ContainerID, nil)
require.NoError(t, err)
err = cli.ContainerRemove(context.Background(), config.ContainerID, types.ContainerRemoveOptions{})
require.NoError(t, err)
}
type dgraphUpdateResponse struct {
Data struct {
Code string `json:"code"`
Message string `json:"message"`
} `json:"data"`
Errors []struct {
Message string `json:"message"`
} `json:"errors"`
}
// DgraphLoadSchema loads a schema into dgraph.
func DgraphLoadSchema(t *testing.T, config *DgraphConfig, schema string) {
t.Log("Loading schema")
url := fmt.Sprintf("http://localhost:%d/admin/schema", config.Port)
for i := 0; i < 30; i++ {
var schemaUpdateResponse dgraphUpdateResponse
buffer := bytes.NewBuffer([]byte(schema))
resp, err := http.Post(url, "text/plain", buffer)
require.NoError(t, err)
require.Equal(t, resp.StatusCode, http.StatusOK)
err = json.NewDecoder(resp.Body).Decode(&schemaUpdateResponse)
require.NoError(t, err)
resp.Body.Close()
if schemaUpdateResponse.Data.Code == "Success" {
time.Sleep(500 * time.Millisecond)
return
}
if len(schemaUpdateResponse.Errors) > 0 {
if strings.Contains(schemaUpdateResponse.Errors[0].Message, "not ready") {
time.Sleep(time.Second)
continue
}
t.Error(schemaUpdateResponse.Errors[0].Message)
return
}
t.Logf("Warning, unexpected response %++v\n", schemaUpdateResponse)
time.Sleep(time.Second)
}
}
// DgraphDropData deletes all data from the graph. The schema is left intact.
func DgraphDropData(t *testing.T, config *DgraphConfig) {
var opUpdateResponse dgraphUpdateResponse
// curl -X POST localhost:8080/alter -d '{"drop_op": "DATA"}'
url := fmt.Sprintf("http://localhost:%d/alter", config.Port)
buffer := bytes.NewBuffer([]byte("{\"drop_op\": \"DATA\"}}"))
resp, err := http.Post(url, "text/plain", buffer)
require.NoError(t, err)
require.Equal(t, resp.StatusCode, http.StatusOK)
err = json.NewDecoder(resp.Body).Decode(&opUpdateResponse)
require.NoError(t, err)
resp.Body.Close()
require.Equal(t, "Success", opUpdateResponse.Data.Code)
}
// DgraphDropAll drops all data AND the schema from the graph.
func DgraphDropAll(t *testing.T, config *DgraphConfig) {
var opUpdateResponse dgraphUpdateResponse
// curl -X POST localhost:8080/alter -d '{"drop_all": true}'
url := fmt.Sprintf("http://localhost:%d/alter", config.Port)
buffer := bytes.NewBuffer([]byte("{\"drop_all\": true}}"))
resp, err := http.Post(url, "text/plain", buffer)
require.NoError(t, err)
require.Equal(t, resp.StatusCode, http.StatusOK)
err = json.NewDecoder(resp.Body).Decode(&opUpdateResponse)
require.NoError(t, err)
resp.Body.Close()
require.Equal(t, "Success", opUpdateResponse.Data.Code)
}
func getFreePort() (int, error) {
addr, err := net.ResolveTCPAddr("tcp", "localhost:0")
if err != nil {
return 0, err
}
l, err := net.ListenTCP("tcp", addr)
if err != nil {
return 0, err
}
defer l.Close()
return l.Addr().(*net.TCPAddr).Port, nil
}