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postgres.go
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postgres.go
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package postgres
import (
"database/sql"
"time"
_ "github.com/lib/pq" // postgresql
"github.com/pkg/errors"
"github.com/simplesurance/baur/storage"
)
// Client is a postgres storage client
type Client struct {
Db *sql.DB
}
// New establishes a connection a postgres db
func New(url string) (*Client, error) {
db, err := sql.Open("postgres", url)
if err != nil {
return nil, err
}
if err := db.Ping(); err != nil {
return nil, err
}
return &Client{
Db: db,
}, nil
}
// Close closes the connection
func (c *Client) Close() {
c.Db.Close()
}
// GetBuildOutputs returns build outputs
func (c *Client) GetBuildOutputs(buildID int) ([]*storage.Output, error) {
const stmt = `SELECT
output.name, output.digest, output.type, output.size_bytes,
upload.id, upload.uri, upload.method, upload.upload_duration_ns
FROM output
JOIN build_output ON output.id = build_output.output_id
JOIN upload ON upload.build_output_id = build_output.id
WHERE build_output.build_id = $1
`
rows, err := c.Db.Query(stmt, buildID)
if err != nil {
return nil, errors.Wrapf(err, "db query %q failed", stmt)
}
var outputs []*storage.Output
for rows.Next() {
var output storage.Output
err := rows.Scan(
&output.Name,
&output.Digest,
&output.Type,
&output.SizeBytes,
&output.Upload.ID,
&output.Upload.URI,
&output.Upload.Method,
&output.Upload.UploadDuration,
)
if err != nil {
return nil, errors.Wrapf(err, "db query %q failed", stmt)
}
outputs = append(outputs, &output)
}
if err := rows.Err(); err != nil {
return nil, errors.Wrap(err, "iterating over rows failed")
}
return outputs, nil
}
// GetApps returns all application records ordered by Name
func (c *Client) GetApps() ([]*storage.Application, error) {
const query = "SELECT id, name FROM application ORDER BY name"
var res []*storage.Application
rows, err := c.Db.Query(query)
if err != nil {
if err == sql.ErrNoRows {
return nil, storage.ErrNotExist
}
return nil, errors.Wrapf(err, "db query %q failed", query)
}
for rows.Next() {
var app storage.Application
err := rows.Scan(&app.ID, &app.Name)
if err != nil {
rows.Close()
return nil, errors.Wrapf(err, "parsing result of query %q failed", query)
}
res = append(res, &app)
}
if err := rows.Err(); err != nil {
return nil, errors.Wrap(err, "iterating over rows failed")
}
return res, nil
}
// GetSameTotalInputDigestsForAppBuilds finds TotalInputDigests that are the
// same for builds of an app with a build start time not before startTs
// If not builds with the same totalInputDigest is found, an empty slice is
// returned.
func (c *Client) GetSameTotalInputDigestsForAppBuilds(appName string, startTs time.Time) (map[string][]int, error) {
const query = `
WITH data AS(
SELECT total_input_digest from build
JOIN application on build.application_id = application.id
WHERE total_input_digest != ''
AND build.start_timestamp >= $1
AND application.name = $2
GROUP BY total_input_digest
HAVING count(total_input_digest) > 1)
SELECT build.id, build.total_input_digest FROM data
JOIN build ON build.total_input_digest = data.total_input_digest
JOIN application on build.application_id = application.id
WHERE build.start_timestamp >= $1
AND application.name = $2`
res := map[string][]int{}
rows, err := c.Db.Query(query, startTs, appName)
if err != nil {
if err == sql.ErrNoRows {
return nil, storage.ErrNotExist
}
return nil, errors.Wrapf(err, "db query %q failed", query)
}
for rows.Next() {
var digest string
var buildID int
err := rows.Scan(&buildID, &digest)
if err != nil {
rows.Close()
return nil, errors.Wrapf(err, "parsing result of query %q failed", query)
}
res[digest] = append(res[digest], buildID)
}
if err := rows.Err(); err != nil {
return nil, errors.Wrap(err, "iterating over rows failed")
}
return res, err
}
// BuildExist returns true if the build with the given ID exist.
func (c *Client) BuildExist(id int) (bool, error) {
const query = "SELECT 1 from build where id = $1"
var val int
row := c.Db.QueryRow(query, id)
err := row.Scan(&val)
if err != nil {
if err == sql.ErrNoRows {
return false, nil
}
return false, err
}
return true, nil
}