From 318e7c28ffa68ea10103d8cb597e7fba8129e553 Mon Sep 17 00:00:00 2001
From: Sydonian <794346190@qq.com>
Date: Wed, 24 May 2023 10:28:56 +0800
Subject: [PATCH] =?UTF-8?q?=E5=AE=8C=E6=88=90=E8=8A=82=E7=82=B9=E6=A3=80?=
 =?UTF-8?q?=E6=9F=A5Cache=E7=9A=84=E4=BB=BB=E5=8A=A1?=
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---
 internal/event/check_cache.go | 127 ++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 internal/event/check_cache.go

diff --git a/internal/event/check_cache.go b/internal/event/check_cache.go
new file mode 100644
index 0000000..319bfc6
--- /dev/null
+++ b/internal/event/check_cache.go
@@ -0,0 +1,127 @@
+package event
+
+import (
+	shell "github.com/ipfs/go-ipfs-api"
+	"github.com/samber/lo"
+	"gitlink.org.cn/cloudream/agent/internal/config"
+	"gitlink.org.cn/cloudream/common/consts"
+	evcst "gitlink.org.cn/cloudream/common/consts/event"
+	"gitlink.org.cn/cloudream/common/utils/logger"
+	"gitlink.org.cn/cloudream/db/model"
+	agtevt "gitlink.org.cn/cloudream/rabbitmq/message/agent/event"
+	scmsg "gitlink.org.cn/cloudream/rabbitmq/message/scanner"
+	scevt "gitlink.org.cn/cloudream/rabbitmq/message/scanner/event"
+)
+
+type CheckCache struct {
+	IsComplete bool
+	Caches     []model.Cache
+}
+
+func NewCheckCache(isComplete bool, caches []model.Cache) *CheckCache {
+	return &CheckCache{
+		IsComplete: isComplete,
+		Caches:     caches,
+	}
+}
+
+func (t *CheckCache) TryMerge(other Event) bool {
+	event, ok := other.(*CheckCache)
+	if !ok {
+		return false
+	}
+
+	if event.IsComplete {
+		t.IsComplete = true
+		t.Caches = event.Caches
+		return true
+	}
+
+	if !t.IsComplete {
+		t.Caches = append(t.Caches, event.Caches...)
+		t.Caches = lo.UniqBy(t.Caches, func(ch model.Cache) string { return ch.HashValue })
+		return true
+	}
+
+	return false
+}
+
+func (t *CheckCache) Execute(execCtx ExecuteContext) {
+	filesMap, err := execCtx.Args.IPFS.GetPinnedFiles()
+	if err != nil {
+		logger.Warnf("get pinned files from ipfs failed, err: %s", err.Error())
+		return
+	}
+
+	// TODO 根据锁定清单过滤被锁定的文件的记录
+	if t.IsComplete {
+		t.checkComplete(filesMap, execCtx)
+	} else {
+		t.checkIncrement(filesMap, execCtx)
+	}
+}
+
+func (t *CheckCache) checkIncrement(filesMap map[string]shell.PinInfo, execCtx ExecuteContext) {
+	for _, cache := range t.Caches {
+		_, ok := filesMap[cache.HashValue]
+		if ok {
+			if cache.State == consts.CACHE_STATE_PINNED {
+				// 不处理
+			} else if cache.State == consts.CACHE_STATE_TEMP {
+				execCtx.Args.IPFS.Unpin(cache.HashValue)
+			}
+
+			// 删除map中的记录，表示此记录已被检查过
+			delete(filesMap, cache.HashValue)
+
+		} else {
+			if cache.State == consts.CACHE_STATE_PINNED {
+				// 需要考虑此处是否是同步的过程
+				execCtx.Args.IPFS.Pin(cache.HashValue)
+			} else if cache.State == consts.CACHE_STATE_TEMP {
+				// 不处理
+			}
+		}
+	}
+
+	// 增量情况下，不需要对filesMap中没检查的记录进行处理
+}
+
+func (t *CheckCache) checkComplete(filesMap map[string]shell.PinInfo, execCtx ExecuteContext) {
+	for _, cache := range t.Caches {
+		_, ok := filesMap[cache.HashValue]
+		if ok {
+			if cache.State == consts.CACHE_STATE_PINNED {
+				// 不处理
+			} else if cache.State == consts.CACHE_STATE_TEMP {
+				execCtx.Args.IPFS.Unpin(cache.HashValue)
+			}
+
+			// 删除map中的记录，表示此记录已被检查过
+			delete(filesMap, cache.HashValue)
+
+		} else {
+			if cache.State == consts.CACHE_STATE_PINNED {
+				// 需要考虑此处是否是同步的过程
+				execCtx.Args.IPFS.Pin(cache.HashValue)
+			} else if cache.State == consts.CACHE_STATE_TEMP {
+				// 不处理
+			}
+		}
+	}
+
+	var updateCacheOps []scevt.UpdateCacheEntry
+	// map中剩下的数据是没有被遍历过，即Cache中没有记录的
+	for hash, _ := range filesMap {
+		updateCacheOps = append(updateCacheOps, scevt.NewUpdateCacheEntry(hash, evcst.UPDATE_CACHE_CREATE_TEMP))
+	}
+	execCtx.Args.Scanner.PostEvent(scmsg.NewPostEventBody(
+		scevt.NewUpdateCache(config.Cfg().ID, updateCacheOps),
+		execCtx.Option.IsEmergency,
+		execCtx.Option.DontMerge,
+	))
+}
+
+func init() {
+	Register(func(val agtevt.CheckCache) Event { return NewCheckCache(val.IsComplete, val.Caches) })
+}