X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/ee5443faad325b16047b9ad4cd588baf51e231fa..fc6b3cd79ba9e07810330d0d47a0ab89ad8857f7:/cmd/arvados-client/container_gateway.go

diff --git a/cmd/arvados-client/container_gateway.go b/cmd/arvados-client/container_gateway.go
index 55f8c33bc7..f23252169f 100644
--- a/cmd/arvados-client/container_gateway.go
+++ b/cmd/arvados-client/container_gateway.go
@@ -7,21 +7,240 @@ package main
 import (
 	"bytes"
 	"context"
+	"crypto/tls"
 	"flag"
 	"fmt"
 	"io"
+	"net/http"
 	"net/url"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"strings"
 	"syscall"
+	"time"
 
 	"git.arvados.org/arvados.git/lib/cmd"
 	"git.arvados.org/arvados.git/lib/controller/rpc"
 	"git.arvados.org/arvados.git/sdk/go/arvados"
 )
 
+// logsCommand displays logs from a running container.
+type logsCommand struct {
+	ac *arvados.Client
+}
+
+func (lc logsCommand) RunCommand(prog string, args []string, stdin io.Reader, stdout, stderr io.Writer) int {
+	f := flag.NewFlagSet(prog, flag.ContinueOnError)
+	pollInterval := f.Duration("poll", time.Second*2, "minimum duration to wait before polling for new data")
+	if ok, code := cmd.ParseFlags(f, prog, args, "container-uuid", stderr); !ok {
+		return code
+	} else if f.NArg() < 1 {
+		fmt.Fprintf(stderr, "missing required argument: container-uuid (try -help)\n")
+		return 2
+	} else if f.NArg() > 1 {
+		fmt.Fprintf(stderr, "encountered extra arguments after container-uuid (try -help)\n")
+		return 2
+	}
+	target := f.Args()[0]
+
+	lc.ac = arvados.NewClientFromEnv()
+	lc.ac.Client = &http.Client{}
+	if lc.ac.Insecure {
+		lc.ac.Client.Transport = &http.Transport{
+			TLSClientConfig: &tls.Config{
+				InsecureSkipVerify: true}}
+	}
+
+	err := lc.tailf(target, stdout, stderr, *pollInterval)
+	if err != nil {
+		fmt.Fprintln(stderr, err)
+		return 1
+	}
+	return 0
+}
+
+func (lc *logsCommand) tailf(target string, stdout, stderr io.Writer, pollInterval time.Duration) error {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	rpcconn := rpcFromEnv()
+	ctrUUID, err := resolveToContainerUUID(rpcconn, target)
+	if err != nil {
+		return err
+	}
+	fmt.Fprintln(stderr, "connecting to container", ctrUUID)
+
+	var (
+		// files to display
+		watching = []string{"crunch-run.txt", "stderr.txt"}
+		// fnm => file offset of next byte to display
+		mark = map[string]int64{}
+		// fnm => current size of file reported by api
+		size = map[string]int64{}
+		// exit after fetching next log chunk
+		containerFinished = false
+	)
+
+poll:
+	for delay := pollInterval; ; time.Sleep(delay) {
+		// When /arvados/v1/containers/{uuid}/log_events is
+		// implemented, we'll wait here for the next
+		// server-sent event to tell us some updated file
+		// sizes. For now, we poll.
+		for _, fnm := range watching {
+			currentsize, _, err := lc.copyRange(ctx, ctrUUID, fnm, "0-0", nil)
+			if err != nil {
+				fmt.Fprintln(stderr, err)
+				delay = pollInterval
+				continue poll
+			}
+			size[fnm] = currentsize
+			if oldsize, seen := mark[fnm]; !seen && currentsize > 10000 {
+				mark[fnm] = currentsize - 10000
+			} else if !seen {
+				mark[fnm] = 0
+			} else if currentsize < oldsize {
+				// Log collection must have been
+				// emptied and reset.
+				fmt.Fprintln(stderr, "--- log restarted ---")
+				for fnm := range mark {
+					delete(mark, fnm)
+				}
+				delay = pollInterval
+				continue poll
+			}
+		}
+		newData := map[string]*bytes.Buffer{}
+		for _, fnm := range watching {
+			if size[fnm] > mark[fnm] {
+				newData[fnm] = &bytes.Buffer{}
+				_, n, err := lc.copyRange(ctx, ctrUUID, fnm, fmt.Sprintf("%d-", mark[fnm]), newData[fnm])
+				if err != nil {
+					fmt.Fprintln(stderr, err)
+				}
+				mark[fnm] += n
+			}
+		}
+		checkState := lc.display(stdout, stderr, watching, newData)
+		if containerFinished {
+			// If the caller specified a container request
+			// UUID and the container we were watching has
+			// been replaced by a new one, start watching
+			// logs from the new one. Otherwise, we're
+			// done.
+			if target == ctrUUID {
+				// caller specified container UUID
+				return nil
+			}
+			newUUID, err := resolveToContainerUUID(rpcconn, target)
+			if err != nil {
+				return err
+			}
+			if newUUID == ctrUUID {
+				// no further attempts
+				return nil
+			}
+			ctrUUID = newUUID
+			containerFinished = false
+			delay = 0
+			continue
+		}
+		if len(newData) > 0 {
+			delay = pollInterval
+		}
+		if len(newData) == 0 || checkState {
+			delay = delay * 2
+			if delay > pollInterval*5 {
+				delay = pollInterval * 5
+			}
+			ctr, err := rpcconn.ContainerGet(ctx, arvados.GetOptions{UUID: ctrUUID, Select: []string{"state"}})
+			if err != nil {
+				fmt.Fprintln(stderr, err)
+				delay = pollInterval
+				continue
+			}
+			if ctr.State == arvados.ContainerStateCancelled || ctr.State == arvados.ContainerStateComplete {
+				containerFinished = true
+				delay = 0
+			}
+		}
+	}
+	return nil
+}
+
+// Retrieve specified byte range (e.g., "12-34", "1234-") from given
+// fnm and write to out.
+//
+// If range is empty ("0-0"), out can be nil.
+//
+// Return values are current file size, bytes copied, error.
+//
+// If the file does not exist, return values are 0, 0, nil.
+func (lc *logsCommand) copyRange(ctx context.Context, uuid, fnm, byterange string, out io.Writer) (int64, int64, error) {
+	ctx, cancel := context.WithDeadline(ctx, time.Now().Add(20*time.Second))
+	defer cancel()
+	srcURL := url.URL{
+		Scheme: "https",
+		Host:   lc.ac.APIHost,
+		Path:   "/arvados/v1/containers/" + uuid + "/log/" + fnm,
+	}
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, srcURL.String(), nil)
+	if err != nil {
+		return 0, 0, err
+	}
+	req.Header.Set("Range", "bytes="+byterange)
+	req.Header.Set("Authorization", "Bearer "+lc.ac.AuthToken)
+	resp, err := lc.ac.Client.Do(req)
+	if err != nil {
+		return 0, 0, err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode == http.StatusNotFound {
+		return 0, 0, nil
+	}
+	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusPartialContent {
+		return 0, 0, fmt.Errorf("error getting %s: %s", fnm, resp.Status)
+	}
+	var rstart, rend, rsize int64
+	_, err = fmt.Sscanf(resp.Header.Get("Content-Range"), "bytes %d-%d/%d", &rstart, &rend, &rsize)
+	if err != nil {
+		return 0, 0, fmt.Errorf("error parsing Content-Range header %q: %s", resp.Header.Get("Content-Range"), err)
+	}
+	if out == nil {
+		return rsize, 0, nil
+	}
+	n, err := io.Copy(out, resp.Body)
+	return rsize, n, err
+}
+
+// display some log data, formatted as desired (prefixing each line
+// with a tag indicating which file it came from, etc.).
+//
+// Return value is true if the log data contained a hint that it's a
+// good time to check whether the container is finished so we can
+// exit.
+func (lc *logsCommand) display(out, stderr io.Writer, watching []string, received map[string]*bytes.Buffer) bool {
+	checkState := false
+	for _, fnm := range watching {
+		buf := received[fnm]
+		if buf == nil || buf.Len() == 0 {
+			continue
+		}
+		for _, line := range bytes.Split(bytes.TrimSuffix(buf.Bytes(), []byte{'\n'}), []byte{'\n'}) {
+			_, err := fmt.Fprintf(out, "%-14s %s\n", fnm, line)
+			if err != nil {
+				fmt.Fprintln(stderr, err)
+			}
+			checkState = checkState ||
+				bytes.HasSuffix(line, []byte("Complete")) ||
+				bytes.HasSuffix(line, []byte("Cancelled")) ||
+				bytes.HasSuffix(line, []byte("Queued"))
+		}
+	}
+	return checkState
+}
+
 // shellCommand connects the terminal to an interactive shell on a
 // running container.
 type shellCommand struct{}
@@ -129,37 +348,14 @@ Options:
 		fmt.Fprintln(stderr, "fatal: ARVADOS_API_HOST and ARVADOS_API_TOKEN environment variables are not set")
 		return 1
 	}
-	insecure := os.Getenv("ARVADOS_API_HOST_INSECURE")
-	rpcconn := rpc.NewConn("",
-		&url.URL{
-			Scheme: "https",
-			Host:   os.Getenv("ARVADOS_API_HOST"),
-		},
-		insecure == "1" || insecure == "yes" || insecure == "true",
-		func(context.Context) ([]string, error) {
-			return []string{os.Getenv("ARVADOS_API_TOKEN")}, nil
-		})
-	if strings.Contains(targetUUID, "-xvhdp-") {
-		crs, err := rpcconn.ContainerRequestList(context.TODO(), arvados.ListOptions{Limit: -1, Filters: []arvados.Filter{{"uuid", "=", targetUUID}}})
-		if err != nil {
-			fmt.Fprintln(stderr, err)
-			return 1
-		}
-		if len(crs.Items) < 1 {
-			fmt.Fprintf(stderr, "container request %q not found\n", targetUUID)
-			return 1
-		}
-		cr := crs.Items[0]
-		if cr.ContainerUUID == "" {
-			fmt.Fprintf(stderr, "no container assigned, container request state is %s\n", strings.ToLower(string(cr.State)))
-			return 1
-		}
-		targetUUID = cr.ContainerUUID
-		fmt.Fprintln(stderr, "connecting to container", targetUUID)
-	} else if !strings.Contains(targetUUID, "-dz642-") {
-		fmt.Fprintf(stderr, "target UUID is not a container or container request UUID: %s\n", targetUUID)
+	rpcconn := rpcFromEnv()
+	targetUUID, err := resolveToContainerUUID(rpcconn, targetUUID)
+	if err != nil {
+		fmt.Fprintln(stderr, err)
 		return 1
 	}
+	fmt.Fprintln(stderr, "connecting to container", targetUUID)
+
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 	sshconn, err := rpcconn.ContainerSSH(ctx, arvados.ContainerSSHOptions{
@@ -199,3 +395,38 @@ Options:
 func shellescape(s string) string {
 	return "'" + strings.Replace(s, "'", "'\\''", -1) + "'"
 }
+
+func rpcFromEnv() *rpc.Conn {
+	insecure := os.Getenv("ARVADOS_API_HOST_INSECURE")
+	return rpc.NewConn("",
+		&url.URL{
+			Scheme: "https",
+			Host:   os.Getenv("ARVADOS_API_HOST"),
+		},
+		insecure == "1" || insecure == "yes" || insecure == "true",
+		func(context.Context) ([]string, error) {
+			return []string{os.Getenv("ARVADOS_API_TOKEN")}, nil
+		})
+}
+
+func resolveToContainerUUID(rpcconn *rpc.Conn, targetUUID string) (string, error) {
+	switch {
+	case strings.Contains(targetUUID, "-dz642-"):
+		return targetUUID, nil
+	case strings.Contains(targetUUID, "-xvhdp-"):
+		crs, err := rpcconn.ContainerRequestList(context.TODO(), arvados.ListOptions{Limit: -1, Filters: []arvados.Filter{{"uuid", "=", targetUUID}}})
+		if err != nil {
+			return "", err
+		}
+		if len(crs.Items) < 1 {
+			return "", fmt.Errorf("container request %q not found\n", targetUUID)
+		}
+		cr := crs.Items[0]
+		if cr.ContainerUUID == "" {
+			return "", fmt.Errorf("no container assigned, container request state is %s\n", strings.ToLower(string(cr.State)))
+		}
+		return cr.ContainerUUID, nil
+	default:
+		return "", fmt.Errorf("target UUID is not a container or container request UUID: %s\n", targetUUID)
+	}
+}