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client.go
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client.go
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package integresql
import (
"bytes"
"context"
"database/sql"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"path"
"github.com/allaboutapps/integresql-client-go/pkg/models"
_ "github.com/lib/pq"
)
var (
ErrManagerNotReady = errors.New("manager not ready")
ErrTemplateAlreadyInitialized = errors.New("template is already initialized")
ErrTemplateNotFound = errors.New("template not found")
ErrDatabaseDiscarded = errors.New("database was discarded (typically failed during initialize/finalize)")
ErrTestNotFound = errors.New("test database not found")
)
type Client struct {
baseURL *url.URL
client *http.Client
config ClientConfig
}
func NewClient(config ClientConfig) (*Client, error) {
c := &Client{
baseURL: nil,
client: nil,
config: config,
}
defaultConfig := DefaultClientConfigFromEnv()
if len(c.config.BaseURL) == 0 {
c.config.BaseURL = defaultConfig.BaseURL
}
if len(c.config.APIVersion) == 0 {
c.config.APIVersion = defaultConfig.APIVersion
}
u, err := url.Parse(c.config.BaseURL)
if err != nil {
return nil, err
}
c.baseURL = u.ResolveReference(&url.URL{Path: path.Join(u.Path, c.config.APIVersion)})
c.client = &http.Client{}
return c, nil
}
func DefaultClientFromEnv() (*Client, error) {
return NewClient(DefaultClientConfigFromEnv())
}
func (c *Client) ResetAllTracking(ctx context.Context) error {
req, err := c.newRequest(ctx, "DELETE", "/admin/templates", nil)
if err != nil {
return err
}
var msg string
resp, err := c.do(req, &msg)
if err != nil {
return err
}
if resp.StatusCode != http.StatusNoContent {
return fmt.Errorf("failed to reset all tracking: %v", msg)
}
return nil
}
func (c *Client) InitializeTemplate(ctx context.Context, hash string) (models.TemplateDatabase, error) {
var template models.TemplateDatabase
payload := map[string]string{"hash": hash}
req, err := c.newRequest(ctx, "POST", "/templates", payload)
if err != nil {
return template, err
}
resp, err := c.do(req, &template)
if err != nil {
return template, err
}
switch resp.StatusCode {
case http.StatusOK:
return template, nil
case http.StatusLocked:
return template, ErrTemplateAlreadyInitialized
case http.StatusServiceUnavailable:
return template, ErrManagerNotReady
default:
return template, fmt.Errorf("received unexpected HTTP status %d (%s)", resp.StatusCode, resp.Status)
}
}
func (c *Client) SetupTemplate(ctx context.Context, hash string, init func(conn string) error) error {
template, err := c.InitializeTemplate(ctx, hash)
if err == nil {
if err := init(template.Config.ConnectionString()); err != nil {
return err
}
return c.FinalizeTemplate(ctx, hash)
} else if err == ErrTemplateAlreadyInitialized {
return nil
} else {
return err
}
}
func (c *Client) SetupTemplateWithDBClient(ctx context.Context, hash string, init func(db *sql.DB) error) error {
template, err := c.InitializeTemplate(ctx, hash)
if err == nil {
db, err := sql.Open("postgres", template.Config.ConnectionString())
if err != nil {
return err
}
defer db.Close()
if err := db.PingContext(ctx); err != nil {
return err
}
if err := init(db); err != nil {
return err
}
return c.FinalizeTemplate(ctx, hash)
} else if err == ErrTemplateAlreadyInitialized {
return nil
} else {
return err
}
}
func (c *Client) DiscardTemplate(ctx context.Context, hash string) error {
req, err := c.newRequest(ctx, "DELETE", fmt.Sprintf("/templates/%s", hash), nil)
if err != nil {
return err
}
resp, err := c.do(req, nil)
if err != nil {
return err
}
switch resp.StatusCode {
case http.StatusNoContent:
return nil
case http.StatusNotFound:
return ErrTemplateNotFound
case http.StatusServiceUnavailable:
return ErrManagerNotReady
default:
return fmt.Errorf("received unexpected HTTP status %d (%s)", resp.StatusCode, resp.Status)
}
}
func (c *Client) FinalizeTemplate(ctx context.Context, hash string) error {
req, err := c.newRequest(ctx, "PUT", fmt.Sprintf("/templates/%s", hash), nil)
if err != nil {
return err
}
resp, err := c.do(req, nil)
if err != nil {
return err
}
switch resp.StatusCode {
case http.StatusNoContent:
return nil
case http.StatusNotFound:
return ErrTemplateNotFound
case http.StatusServiceUnavailable:
return ErrManagerNotReady
default:
return fmt.Errorf("received unexpected HTTP status %d (%s)", resp.StatusCode, resp.Status)
}
}
func (c *Client) GetTestDatabase(ctx context.Context, hash string) (models.TestDatabase, error) {
var test models.TestDatabase
req, err := c.newRequest(ctx, "GET", fmt.Sprintf("/templates/%s/tests", hash), nil)
if err != nil {
return test, err
}
resp, err := c.do(req, &test)
if err != nil {
return test, err
}
switch resp.StatusCode {
case http.StatusOK:
return test, nil
case http.StatusNotFound:
return test, ErrTemplateNotFound
case http.StatusGone:
return test, ErrDatabaseDiscarded
case http.StatusServiceUnavailable:
return test, ErrManagerNotReady
default:
return test, fmt.Errorf("received unexpected HTTP status %d (%s)", resp.StatusCode, resp.Status)
}
}
func (c *Client) ReturnTestDatabase(ctx context.Context, hash string, id int) error {
req, err := c.newRequest(ctx, "DELETE", fmt.Sprintf("/templates/%s/tests/%d", hash, id), nil)
if err != nil {
return err
}
resp, err := c.do(req, nil)
if err != nil {
return err
}
switch resp.StatusCode {
case http.StatusNoContent:
return nil
case http.StatusNotFound:
return ErrTemplateNotFound
case http.StatusServiceUnavailable:
return ErrManagerNotReady
default:
return fmt.Errorf("received unexpected HTTP status %d (%s)", resp.StatusCode, resp.Status)
}
}
func (c *Client) newRequest(ctx context.Context, method string, endpoint string, body interface{}) (*http.Request, error) {
u := c.baseURL.ResolveReference(&url.URL{Path: path.Join(c.baseURL.Path, endpoint)})
var buf io.ReadWriter
if body != nil {
buf = new(bytes.Buffer)
if err := json.NewEncoder(buf).Encode(body); err != nil {
return nil, err
}
}
req, err := http.NewRequestWithContext(ctx, method, u.String(), buf)
if err != nil {
return nil, err
}
if body != nil {
req.Header.Set("Content-Type", "application/json; charset=UTF-8")
}
req.Header.Set("Accept", "application/json")
return req, nil
}
func (c *Client) do(req *http.Request, v interface{}) (*http.Response, error) {
resp, err := c.client.Do(req)
if err != nil {
return nil, err
}
// body must always be closed
defer resp.Body.Close()
if resp.StatusCode == http.StatusAccepted || resp.StatusCode == http.StatusNoContent {
return resp, nil
}
// if the provided v pointer is nil we cannot unmarschal the body to anything
if v == nil {
return resp, nil
}
if err := json.NewDecoder(resp.Body).Decode(v); err != nil {
return nil, err
}
return resp, err
}