Filter pods through pod list api

Refactored current filter pods flow through the shared pod functions
so filter pod functionalities can be shared between api and cmd.

Signed-off-by: Sujil02 <sushah@redhat.com>

2 files changed, 137 insertions, 115 deletions

diff --git a/cmd/podman/pod_ps.go b/cmd/podman/pod_ps.go
index d7731e983..7acbd6888 100644
--- a/cmd/podman/pod_ps.go
+++ b/cmd/podman/pod_ps.go
@@ -4,7 +4,6 @@ import (
 	"fmt"
 	"reflect"
 	"sort"
-	"strconv"
 	"strings"
 	"time"
 
@@ -13,7 +12,6 @@ import (
 	"github.com/containers/libpod/cmd/podman/shared"
 	"github.com/containers/libpod/libpod/define"
 	"github.com/containers/libpod/pkg/adapter"
-	"github.com/containers/libpod/pkg/util"
 	"github.com/docker/go-units"
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
@@ -29,8 +27,6 @@ const (
 	NUM_CTR_INFO = 10
 )
 
-type PodFilter func(*adapter.Pod) bool
-
 var (
 	bc_opts shared.PsOptions
 )
@@ -174,29 +170,23 @@ func podPsCmd(c *cliconfig.PodPsValues) error {
 
 	opts.Format = genPodPsFormat(c)
 
-	var filterFuncs []PodFilter
-	if c.Filter != "" {
-		filters := strings.Split(c.Filter, ",")
-		for _, f := range filters {
-			filterSplit := strings.Split(f, "=")
-			if len(filterSplit) < 2 {
-				return errors.Errorf("filter input must be in the form of filter=value: %s is invalid", f)
-			}
-			generatedFunc, err := generatePodFilterFuncs(filterSplit[0], filterSplit[1])
-			if err != nil {
-				return errors.Wrapf(err, "invalid filter")
-			}
-			filterFuncs = append(filterFuncs, generatedFunc)
-		}
-	}
-
 	var pods []*adapter.Pod
+
+	// If latest is set true filters are ignored.
 	if c.Latest {
 		pod, err := runtime.GetLatestPod()
 		if err != nil {
 			return err
 		}
 		pods = append(pods, pod)
+		return generatePodPsOutput(pods, opts)
+	}
+
+	if c.Filter != "" {
+		pods, err = runtime.GetPodsWithFilters(c.Filter)
+		if err != nil {
+			return err
+		}
 	} else {
 		pods, err = runtime.GetAllPods()
 		if err != nil {
@@ -204,19 +194,7 @@ func podPsCmd(c *cliconfig.PodPsValues) error {
 		}
 	}
 
-	podsFiltered := make([]*adapter.Pod, 0, len(pods))
-	for _, pod := range pods {
-		include := true
-		for _, filter := range filterFuncs {
-			include = include && filter(pod)
-		}
-
-		if include {
-			podsFiltered = append(podsFiltered, pod)
-		}
-	}
-
-	return generatePodPsOutput(podsFiltered, opts)
+	return generatePodPsOutput(pods, opts)
 }
 
 // podPsCheckFlagsPassed checks if mutually exclusive flags are passed together
@@ -235,88 +213,6 @@ func podPsCheckFlagsPassed(c *cliconfig.PodPsValues) error {
 	return nil
 }
 
-func generatePodFilterFuncs(filter, filterValue string) (func(pod *adapter.Pod) bool, error) {
-	switch filter {
-	case "ctr-ids":
-		return func(p *adapter.Pod) bool {
-			ctrIds, err := p.AllContainersByID()
-			if err != nil {
-				return false
-			}
-			return util.StringInSlice(filterValue, ctrIds)
-		}, nil
-	case "ctr-names":
-		return func(p *adapter.Pod) bool {
-			ctrs, err := p.AllContainers()
-			if err != nil {
-				return false
-			}
-			for _, ctr := range ctrs {
-				if filterValue == ctr.Name() {
-					return true
-				}
-			}
-			return false
-		}, nil
-	case "ctr-number":
-		return func(p *adapter.Pod) bool {
-			ctrIds, err := p.AllContainersByID()
-			if err != nil {
-				return false
-			}
-
-			fVint, err2 := strconv.Atoi(filterValue)
-			if err2 != nil {
-				return false
-			}
-			return len(ctrIds) == fVint
-		}, nil
-	case "ctr-status":
-		if !util.StringInSlice(filterValue, []string{"created", "restarting", "running", "paused", "exited", "unknown"}) {
-			return nil, errors.Errorf("%s is not a valid status", filterValue)
-		}
-		return func(p *adapter.Pod) bool {
-			ctr_statuses, err := p.Status()
-			if err != nil {
-				return false
-			}
-			for _, ctr_status := range ctr_statuses {
-				state := ctr_status.String()
-				if ctr_status == define.ContainerStateConfigured {
-					state = "created"
-				}
-				if state == filterValue {
-					return true
-				}
-			}
-			return false
-		}, nil
-	case "id":
-		return func(p *adapter.Pod) bool {
-			return strings.Contains(p.ID(), filterValue)
-		}, nil
-	case "name":
-		return func(p *adapter.Pod) bool {
-			return strings.Contains(p.Name(), filterValue)
-		}, nil
-	case "status":
-		if !util.StringInSlice(filterValue, []string{"stopped", "running", "paused", "exited", "dead", "created"}) {
-			return nil, errors.Errorf("%s is not a valid pod status", filterValue)
-		}
-		return func(p *adapter.Pod) bool {
-			status, err := p.GetPodStatus()
-			if err != nil {
-				return false
-			}
-			if strings.ToLower(status) == filterValue {
-				return true
-			}
-			return false
-		}, nil
-	}
-	return nil, errors.Errorf("%s is an invalid filter", filter)
-}
-
 // generate the template based on conditions given
 func genPodPsFormat(c *cliconfig.PodPsValues) string {
 	format := ""
diff --git a/cmd/podman/shared/pod.go b/cmd/podman/shared/pod.go
index 7b0b497fc..3046953b5 100644
--- a/cmd/podman/shared/pod.go
+++ b/cmd/podman/shared/pod.go
@@ -2,9 +2,11 @@ package shared
 
 import (
 	"strconv"
+	"strings"
 
 	"github.com/containers/libpod/libpod"
 	"github.com/containers/libpod/libpod/define"
+	"github.com/containers/libpod/pkg/util"
 	"github.com/cri-o/ocicni/pkg/ocicni"
 	"github.com/docker/go-connections/nat"
 	"github.com/pkg/errors"
@@ -134,4 +136,128 @@ func CreatePortBindings(ports []string) ([]ocicni.PortMapping, error) {
 	return portBindings, nil
 }
 
+// GetPodsWithFilters uses the cliconfig to categorize if the latest pod is required.
+func GetPodsWithFilters(r *libpod.Runtime, filters string) ([]*libpod.Pod, error) {
+	filterFuncs, err := GenerateFilterFunction(r, strings.Split(filters, ","))
+	if err != nil {
+		return nil, err
+	}
+	return FilterAllPodsWithFilterFunc(r, filterFuncs...)
+}
+
+// FilterAllPodsWithFilterFunc retrieves all pods
+// Filters can be provided which will determine which pods are included in the
+// output. Multiple filters are handled by ANDing their output, so only pods
+// matching all filters are returned
+func FilterAllPodsWithFilterFunc(r *libpod.Runtime, filters ...libpod.PodFilter) ([]*libpod.Pod, error) {
+	pods, err := r.Pods(filters...)
+	if err != nil {
+		return nil, err
+	}
+	return pods, nil
+}
+
+// GenerateFilterFunction basically gets the filters based on the input by the user
+// and filter the pod list based on the criteria.
+func GenerateFilterFunction(r *libpod.Runtime, filters []string) ([]libpod.PodFilter, error) {
+	var filterFuncs []libpod.PodFilter
+	for _, f := range filters {
+		filterSplit := strings.Split(f, "=")
+		if len(filterSplit) < 2 {
+			return nil, errors.Errorf("filter input must be in the form of filter=value: %s is invalid", f)
+		}
+		generatedFunc, err := generatePodFilterFuncs(filterSplit[0], filterSplit[1])
+		if err != nil {
+			return nil, errors.Wrapf(err, "invalid filter")
+		}
+		filterFuncs = append(filterFuncs, generatedFunc)
+	}
+
+	return filterFuncs, nil
+}
+func generatePodFilterFuncs(filter, filterValue string) (
+	func(pod *libpod.Pod) bool, error) {
+	switch filter {
+	case "ctr-ids":
+		return func(p *libpod.Pod) bool {
+			ctrIds, err := p.AllContainersByID()
+			if err != nil {
+				return false
+			}
+			return util.StringInSlice(filterValue, ctrIds)
+		}, nil
+	case "ctr-names":
+		return func(p *libpod.Pod) bool {
+			ctrs, err := p.AllContainers()
+			if err != nil {
+				return false
+			}
+			for _, ctr := range ctrs {
+				if filterValue == ctr.Name() {
+					return true
+				}
+			}
+			return false
+		}, nil
+	case "ctr-number":
+		return func(p *libpod.Pod) bool {
+			ctrIds, err := p.AllContainersByID()
+			if err != nil {
+				return false
+			}
+
+			fVint, err2 := strconv.Atoi(filterValue)
+			if err2 != nil {
+				return false
+			}
+			return len(ctrIds) == fVint
+		}, nil
+	case "ctr-status":
+		if !util.StringInSlice(filterValue,
+			[]string{"created", "restarting", "running", "paused",
+				"exited", "unknown"}) {
+			return nil, errors.Errorf("%s is not a valid status", filterValue)
+		}
+		return func(p *libpod.Pod) bool {
+			ctr_statuses, err := p.Status()
+			if err != nil {
+				return false
+			}
+			for _, ctr_status := range ctr_statuses {
+				state := ctr_status.String()
+				if ctr_status == define.ContainerStateConfigured {
+					state = "created"
+				}
+				if state == filterValue {
+					return true
+				}
+			}
+			return false
+		}, nil
+	case "id":
+		return func(p *libpod.Pod) bool {
+			return strings.Contains(p.ID(), filterValue)
+		}, nil
+	case "name":
+		return func(p *libpod.Pod) bool {
+			return strings.Contains(p.Name(), filterValue)
+		}, nil
+	case "status":
+		if !util.StringInSlice(filterValue, []string{"stopped", "running", "paused", "exited", "dead", "created"}) {
+			return nil, errors.Errorf("%s is not a valid pod status", filterValue)
+		}
+		return func(p *libpod.Pod) bool {
+			status, err := p.GetPodStatus()
+			if err != nil {
+				return false
+			}
+			if strings.ToLower(status) == filterValue {
+				return true
+			}
+			return false
+		}, nil
+	}
+	return nil, errors.Errorf("%s is an invalid filter", filter)
+}
+
 var DefaultKernelNamespaces = "cgroup,ipc,net,uts"