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|
package gonf
import (
"bytes"
"log/slog"
"os/exec"
)
var commands []*CommandPromise
func init() {
commands = make([]*CommandPromise, 0)
}
func Command(cmd string, args ...string) *CommandPromise {
return CommandWithEnv([]string{}, cmd, args...)
}
func CommandWithEnv(env []string, cmd string, args ...string) *CommandPromise {
return &CommandPromise{
args: args,
chain: nil,
cmd: cmd,
env: env,
err: nil,
status: DECLARED,
}
}
type CommandPromise struct {
args []string
chain []Promise
cmd string
env []string
err error
status Status
Stdout bytes.Buffer
Stderr bytes.Buffer
}
func (c *CommandPromise) IfRepaired(p ...Promise) Promise {
c.chain = append(c.chain, p...)
return c
}
func (c *CommandPromise) Promise() *CommandPromise {
if c.status == DECLARED {
c.status = PROMISED
commands = append(commands, c)
}
return c
}
func (c *CommandPromise) Resolve() {
cmd := exec.Command(c.cmd, c.args...)
for _, e := range c.env {
cmd.Env = append(cmd.Environ(), e)
}
cmd.Stdout = &c.Stdout
cmd.Stderr = &c.Stderr
if c.err = cmd.Run(); c.err != nil {
c.status = BROKEN
slog.Error("command", "args", c.args, "cmd", c.cmd, "env", c.env, "err", c.err, "stdout", c.Stdout.String(), "stderr", c.Stderr.String(), "status", c.Status)
return
}
if c.Stdout.Len() == 0 && c.Stderr.Len() > 0 {
c.status = BROKEN
slog.Error("command", "args", c.args, "cmd", c.cmd, "env", c.env, "stdout", c.Stdout.String(), "stderr", c.Stderr.String(), "status", c.Status)
return
}
c.status = REPAIRED
slog.Info("command", "args", c.args, "cmd", c.cmd, "env", c.env, "stderr", c.Stderr.String(), "status", c.Status)
// TODO add a notion of repaired?
for _, p := range c.chain {
p.Resolve()
}
}
func (c CommandPromise) Status() Status {
return c.status
}
func resolveCommands() (status Status) {
status = KEPT
for _, c := range commands {
if c.status == PROMISED {
c.Resolve()
switch c.status {
case BROKEN:
return BROKEN
case REPAIRED:
status = REPAIRED
}
}
}
return
}
|
