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harmony: Fix last_contact race

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This commit is contained in:
Łukasz Magiera 2023-10-31 15:05:33 +01:00
parent adb0fc3259
commit ca4e2d71b6
1 changed files with 25 additions and 22 deletions
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47
lib/harmony/resources/resources.go
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@ -3,7 +3,6 @@ package resources
import (
"bytes"
"context"
"fmt"
"os/exec"
"regexp"
"runtime"
@ -49,30 +48,34 @@ func Register(db *harmonydb.DB, hostnameAndPort string) (*Reg, error) {
}
ctx := context.Background()
{ // Learn our owner_id while updating harmony_machines
var ownerID []int
err := db.Select(ctx, &ownerID, `SELECT id FROM harmony_machines WHERE host_and_port=$1`, hostnameAndPort)
if err != nil {
return nil, fmt.Errorf("could not read from harmony_machines: %w", err)
}
var ownerID int
gpuram := uint64(lo.Sum(reg.GpuRam))
if len(ownerID) == 0 {
err = db.QueryRow(ctx, `INSERT INTO harmony_machines
(host_and_port, cpu, ram, gpu, gpuram) VALUES
($1,$2,$3,$4,$5) RETURNING id`,
hostnameAndPort, reg.Cpu, reg.Ram, reg.Gpu, gpuram).Scan(&reg.Resources.MachineID)
if err != nil {
return nil, err
}
} else {
reg.MachineID = ownerID[0]
_, err := db.Exec(ctx, `UPDATE harmony_machines SET
cpu=$1, ram=$2, gpu=$3, gpuram=$4 WHERE id=$5`,
reg.Cpu, reg.Ram, reg.Gpu, gpuram, reg.Resources.MachineID)
if err != nil {
return nil, err
}
// Upsert query with last_contact update, fetch the machine ID
// (note this isn't a simple insert .. on conflict because host_and_port isn't unique)
err := db.QueryRow(ctx, `
WITH upsert AS (
UPDATE harmony_machines
SET cpu = $2, ram = $3, gpu = $4, gpuram = $5, last_contact = CURRENT_TIMESTAMP
WHERE host_and_port = $1
RETURNING id
),
inserted AS (
INSERT INTO harmony_machines (host_and_port, cpu, ram, gpu, gpuram, last_contact)
SELECT $1, $2, $3, $4, $5, CURRENT_TIMESTAMP
WHERE NOT EXISTS (SELECT id FROM upsert)
RETURNING id
)
SELECT id FROM upsert
UNION ALL
SELECT id FROM inserted;
`, hostnameAndPort, reg.Cpu, reg.Ram, reg.Gpu, gpuram).Scan(&ownerID)
if err != nil {
return nil, err
}
reg.MachineID = ownerID
cleaned := CleanupMachines(context.Background(), db)
logger.Infow("Cleaned up machines", "count", cleaned)
}