hilimd
4 years ago
committed by
GitHub
GitHub
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
36 changed files with 870 additions and 100 deletions
-
114.github/workflows/container_latest.yml
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118.github/workflows/container_release.yml
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2README.md
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6docker/Dockerfile.go_build
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6docker/Dockerfile.go_build_large
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2docker/compose/local-mount-profile-compose.yml
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6go.mod
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2go.sum
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4k8s/seaweedfs/Chart.yaml
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2k8s/seaweedfs/values.yaml
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62weed/command/filer_copy.go
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2weed/filer/filerstore_wrapper.go
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6weed/filer/reader_at.go
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2weed/filesys/dir.go
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9weed/filesys/dir_rename.go
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3weed/filesys/dirty_page_interval.go
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10weed/filesys/dirty_pages.go
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32weed/filesys/dirty_pages_continuous.go
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166weed/filesys/dirty_pages_temp_file.go
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289weed/filesys/dirty_pages_temp_interval.go
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10weed/filesys/file.go
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25weed/filesys/filehandle.go
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2weed/filesys/meta_cache/meta_cache.go
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7weed/filesys/wfs.go
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2weed/s3api/s3err/s3api_errors.go
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16weed/server/common.go
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2weed/server/volume_grpc_copy.go
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13weed/statik/statik.go
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4weed/storage/volume_vacuum.go
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4weed/topology/node.go
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8weed/topology/topology.go
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11weed/topology/topology_event_handling.go
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6weed/topology/volume_layout.go
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2weed/util/bounded_tree/bounded_tree.go
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2weed/util/constants.go
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13weed/weed.go
@ -0,0 +1,114 @@ |
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name: Build Latest Containers |
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on: |
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push: |
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branches: |
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- master |
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workflow_dispatch: [] |
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|
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jobs: |
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build-latest: |
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runs-on: [ubuntu-latest] |
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steps: |
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- |
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name: Checkout |
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uses: actions/checkout@v2 |
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- |
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name: Docker meta |
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id: docker_meta |
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uses: crazy-max/ghaction-docker-meta@v2 |
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with: |
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images: | |
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chrislusf/seaweedfs |
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ghcr.io/chrislusf/seaweedfs |
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tags: | |
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type=raw,value=latest |
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labels: | |
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org.opencontainers.image.title=seaweedfs |
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org.opencontainers.image.vendor=Chris Lu |
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- |
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name: Set up QEMU |
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uses: docker/setup-qemu-action@v1 |
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- |
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name: Set up Docker Buildx |
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uses: docker/setup-buildx-action@v1 |
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with: |
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buildkitd-flags: "--debug" |
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- |
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name: Login to Docker Hub |
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if: github.event_name != 'pull_request' |
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uses: docker/login-action@v1 |
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with: |
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username: ${{ secrets.DOCKER_USERNAME }} |
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password: ${{ secrets.DOCKER_PASSWORD }} |
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- |
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name: Login to GHCR |
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if: github.event_name != 'pull_request' |
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uses: docker/login-action@v1 |
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with: |
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registry: ghcr.io |
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username: ${{ secrets.GHCR_USERNAME }} |
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password: ${{ secrets.GHCR_TOKEN }} |
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- |
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name: Build |
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uses: docker/build-push-action@v2 |
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with: |
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context: ./docker |
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push: ${{ github.event_name != 'pull_request' }} |
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file: ./docker/Dockerfile |
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platforms: linux/amd64 |
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tags: ${{ steps.docker_meta.outputs.tags }} |
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labels: ${{ steps.docker_meta.outputs.labels }} |
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|
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build-dev: |
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runs-on: [ubuntu-latest] |
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steps: |
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- |
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name: Checkout |
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uses: actions/checkout@v2 |
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- |
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name: Docker meta |
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id: docker_meta |
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uses: crazy-max/ghaction-docker-meta@v2 |
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with: |
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images: | |
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chrislusf/seaweedfs |
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ghcr.io/chrislusf/seaweedfs |
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tags: | |
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type=raw,value=dev |
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labels: | |
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org.opencontainers.image.title=seaweedfs |
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org.opencontainers.image.description=SeaweedFS is a distributed storage system for blobs, objects, files, and data lake, to store and serve billions of files fast! |
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org.opencontainers.image.vendor=Chris Lu |
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- |
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name: Set up QEMU |
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uses: docker/setup-qemu-action@v1 |
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- |
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name: Set up Docker Buildx |
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uses: docker/setup-buildx-action@v1 |
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with: |
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buildkitd-flags: "--debug" |
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- |
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name: Login to Docker Hub |
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if: github.event_name != 'pull_request' |
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uses: docker/login-action@v1 |
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with: |
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username: ${{ secrets.DOCKER_USERNAME }} |
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password: ${{ secrets.DOCKER_PASSWORD }} |
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- |
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name: Login to GHCR |
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if: github.event_name != 'pull_request' |
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uses: docker/login-action@v1 |
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with: |
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registry: ghcr.io |
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username: ${{ secrets.GHCR_USERNAME }} |
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password: ${{ secrets.GHCR_TOKEN }} |
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- |
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name: Build |
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uses: docker/build-push-action@v2 |
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with: |
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context: ./docker |
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push: ${{ github.event_name != 'pull_request' }} |
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file: ./docker/Dockerfile.go_build |
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platforms: linux/amd64 |
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tags: ${{ steps.docker_meta.outputs.tags }} |
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labels: ${{ steps.docker_meta.outputs.labels }} |
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@ -0,0 +1,118 @@ |
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name: Build Release Containers |
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on: |
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push: |
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tags: |
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- '*' |
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workflow_dispatch: [] |
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|
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jobs: |
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build-default: |
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runs-on: [ubuntu-latest] |
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steps: |
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- |
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name: Checkout |
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uses: actions/checkout@v2 |
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- |
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name: Docker meta |
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id: docker_meta |
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uses: crazy-max/ghaction-docker-meta@v2 |
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with: |
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images: | |
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chrislusf/seaweedfs |
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ghcr.io/chrislusf/seaweedfs |
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tags: | |
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type=ref,event=tag |
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flavor: | |
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latest=false |
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labels: | |
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org.opencontainers.image.title=seaweedfs |
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org.opencontainers.image.description=SeaweedFS is a distributed storage system for blobs, objects, files, and data lake, to store and serve billions of files fast! |
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org.opencontainers.image.vendor=Chris Lu |
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- |
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name: Set up QEMU |
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uses: docker/setup-qemu-action@v1 |
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- |
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name: Set up Docker Buildx |
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uses: docker/setup-buildx-action@v1 |
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with: |
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buildkitd-flags: "--debug" |
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- |
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name: Login to Docker Hub |
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if: github.event_name != 'pull_request' |
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uses: docker/login-action@v1 |
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with: |
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username: ${{ secrets.DOCKER_USERNAME }} |
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password: ${{ secrets.DOCKER_PASSWORD }} |
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- |
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name: Login to GHCR |
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if: github.event_name != 'pull_request' |
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uses: docker/login-action@v1 |
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with: |
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registry: ghcr.io |
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username: ${{ secrets.GHCR_USERNAME }} |
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password: ${{ secrets.GHCR_TOKEN }} |
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- |
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name: Build |
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uses: docker/build-push-action@v2 |
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with: |
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context: ./docker |
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push: ${{ github.event_name != 'pull_request' }} |
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file: ./docker/Dockerfile.go_build |
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platforms: linux/amd64 |
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tags: ${{ steps.docker_meta.outputs.tags }} |
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labels: ${{ steps.docker_meta.outputs.labels }} |
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build-large: |
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runs-on: [ubuntu-latest] |
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steps: |
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- |
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name: Checkout |
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uses: actions/checkout@v2 |
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- |
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name: Docker meta |
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id: docker_meta |
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uses: crazy-max/ghaction-docker-meta@v2 |
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with: |
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images: | |
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chrislusf/seaweedfs |
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ghcr.io/chrislusf/seaweedfs |
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tags: | |
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type=ref,event=tag,suffix=_large_disk |
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flavor: | |
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latest=false |
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labels: | |
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org.opencontainers.image.title=seaweedfs |
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org.opencontainers.image.description=SeaweedFS is a distributed storage system for blobs, objects, files, and data lake, to store and serve billions of files fast! |
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org.opencontainers.image.vendor=Chris Lu |
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- |
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name: Set up QEMU |
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uses: docker/setup-qemu-action@v1 |
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- |
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name: Set up Docker Buildx |
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uses: docker/setup-buildx-action@v1 |
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with: |
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buildkitd-flags: "--debug" |
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- |
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name: Login to Docker Hub |
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if: github.event_name != 'pull_request' |
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uses: docker/login-action@v1 |
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with: |
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username: ${{ secrets.DOCKER_USERNAME }} |
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password: ${{ secrets.DOCKER_PASSWORD }} |
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- |
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name: Login to GHCR |
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if: github.event_name != 'pull_request' |
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uses: docker/login-action@v1 |
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with: |
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registry: ghcr.io |
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username: ${{ secrets.GHCR_USERNAME }} |
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password: ${{ secrets.GHCR_TOKEN }} |
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- |
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name: Build |
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uses: docker/build-push-action@v2 |
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with: |
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context: ./docker |
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push: ${{ github.event_name != 'pull_request' }} |
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file: ./docker/Dockerfile.go_build_large |
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platforms: linux/amd64 |
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tags: ${{ steps.docker_meta.outputs.tags }} |
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labels: ${{ steps.docker_meta.outputs.labels }} |
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@ -1,5 +1,5 @@ |
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apiVersion: v1 |
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description: SeaweedFS |
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name: seaweedfs |
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appVersion: "2.43" |
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version: 2.43 |
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appVersion: "2.48" |
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version: 2.48 |
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@ -0,0 +1,10 @@ |
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package filesys |
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|
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type DirtyPages interface { |
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AddPage(offset int64, data []byte) |
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FlushData() error |
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ReadDirtyDataAt(data []byte, startOffset int64) (maxStop int64) |
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GetStorageOptions() (collection, replication string) |
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SetWriteOnly(writeOnly bool) |
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GetWriteOnly() (writeOnly bool) |
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} |
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@ -0,0 +1,166 @@ |
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package filesys |
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|
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import ( |
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"fmt" |
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"github.com/chrislusf/seaweedfs/weed/glog" |
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"github.com/chrislusf/seaweedfs/weed/pb/filer_pb" |
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"io" |
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"os" |
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"path/filepath" |
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"sync" |
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"time" |
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) |
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|
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type TempFileDirtyPages struct { |
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f *File |
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tf *os.File |
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writtenIntervals *WrittenContinuousIntervals |
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writeOnly bool |
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writeWaitGroup sync.WaitGroup |
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pageAddLock sync.Mutex |
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chunkAddLock sync.Mutex |
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lastErr error |
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collection string |
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replication string |
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} |
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|
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var ( |
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tmpDir = filepath.Join(os.TempDir(), "sw") |
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) |
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|
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func init() { |
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os.Mkdir(tmpDir, 0755) |
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} |
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|
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func newTempFileDirtyPages(file *File, writeOnly bool) *TempFileDirtyPages { |
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|
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tempFile := &TempFileDirtyPages{ |
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f: file, |
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writeOnly: writeOnly, |
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writtenIntervals: &WrittenContinuousIntervals{}, |
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} |
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|
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return tempFile |
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} |
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|
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func (pages *TempFileDirtyPages) AddPage(offset int64, data []byte) { |
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|
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pages.pageAddLock.Lock() |
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defer pages.pageAddLock.Unlock() |
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|
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if pages.tf == nil { |
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tf, err := os.CreateTemp(tmpDir, "") |
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if err != nil { |
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glog.Errorf("create temp file: %v", err) |
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pages.lastErr = err |
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return |
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} |
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pages.tf = tf |
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pages.writtenIntervals.tempFile = tf |
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pages.writtenIntervals.lastOffset = 0 |
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} |
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|
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writtenOffset := pages.writtenIntervals.lastOffset |
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dataSize := int64(len(data)) |
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|
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// glog.V(4).Infof("%s AddPage %v at %d [%d,%d)", pages.f.fullpath(), pages.tf.Name(), writtenOffset, offset, offset+dataSize)
|
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|
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if _, err := pages.tf.WriteAt(data, writtenOffset); err != nil { |
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pages.lastErr = err |
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} else { |
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pages.writtenIntervals.AddInterval(writtenOffset, len(data), offset) |
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pages.writtenIntervals.lastOffset += dataSize |
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} |
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|
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// pages.writtenIntervals.debug()
|
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|
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return |
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} |
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|
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func (pages *TempFileDirtyPages) FlushData() error { |
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|
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pages.saveExistingPagesToStorage() |
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pages.writeWaitGroup.Wait() |
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if pages.lastErr != nil { |
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return fmt.Errorf("flush data: %v", pages.lastErr) |
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} |
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pages.pageAddLock.Lock() |
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defer pages.pageAddLock.Unlock() |
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if pages.tf != nil { |
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|
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pages.writtenIntervals.tempFile = nil |
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pages.writtenIntervals.lists = nil |
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|
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pages.tf.Close() |
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os.Remove(pages.tf.Name()) |
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pages.tf = nil |
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} |
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return nil |
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} |
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|
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func (pages *TempFileDirtyPages) saveExistingPagesToStorage() { |
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|
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pageSize := pages.f.wfs.option.ChunkSizeLimit |
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|
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// glog.V(4).Infof("%v saveExistingPagesToStorage %d lists", pages.f.Name, len(pages.writtenIntervals.lists))
|
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|
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for _, list := range pages.writtenIntervals.lists { |
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listStopOffset := list.Offset() + list.Size() |
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for uploadedOffset:=int64(0); uploadedOffset < listStopOffset; uploadedOffset += pageSize { |
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start, stop := max(list.Offset(), uploadedOffset), min(listStopOffset, uploadedOffset+pageSize) |
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if start >= stop { |
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continue |
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} |
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// glog.V(4).Infof("uploading %v [%d,%d) %d/%d", pages.f.Name, start, stop, i, len(pages.writtenIntervals.lists))
|
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pages.saveToStorage(list.ToReader(start, stop), start, stop-start) |
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} |
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} |
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|
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} |
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|
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func (pages *TempFileDirtyPages) saveToStorage(reader io.Reader, offset int64, size int64) { |
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|
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mtime := time.Now().UnixNano() |
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pages.writeWaitGroup.Add(1) |
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writer := func() { |
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defer pages.writeWaitGroup.Done() |
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|
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reader = io.LimitReader(reader, size) |
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chunk, collection, replication, err := pages.f.wfs.saveDataAsChunk(pages.f.fullpath(), pages.writeOnly)(reader, pages.f.Name, offset) |
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if err != nil { |
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glog.V(0).Infof("%s saveToStorage [%d,%d): %v", pages.f.fullpath(), offset, offset+size, err) |
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pages.lastErr = err |
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return |
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} |
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chunk.Mtime = mtime |
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pages.collection, pages.replication = collection, replication |
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pages.chunkAddLock.Lock() |
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defer pages.chunkAddLock.Unlock() |
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pages.f.addChunks([]*filer_pb.FileChunk{chunk}) |
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glog.V(3).Infof("%s saveToStorage %s [%d,%d)", pages.f.fullpath(), chunk.FileId, offset, offset+size) |
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} |
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|
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if pages.f.wfs.concurrentWriters != nil { |
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pages.f.wfs.concurrentWriters.Execute(writer) |
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} else { |
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go writer() |
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} |
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} |
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|
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func (pages *TempFileDirtyPages) ReadDirtyDataAt(data []byte, startOffset int64) (maxStop int64) { |
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return pages.writtenIntervals.ReadDataAt(data, startOffset) |
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} |
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|
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func (pages *TempFileDirtyPages) GetStorageOptions() (collection, replication string) { |
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return pages.collection, pages.replication |
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} |
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|
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func (pages *TempFileDirtyPages) SetWriteOnly(writeOnly bool) { |
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if pages.writeOnly { |
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pages.writeOnly = writeOnly |
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} |
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} |
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|
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func (pages *TempFileDirtyPages) GetWriteOnly() (writeOnly bool) { |
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return pages.writeOnly |
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} |
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@ -0,0 +1,289 @@ |
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package filesys |
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|
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import ( |
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"io" |
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"log" |
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"os" |
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) |
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|
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type WrittenIntervalNode struct { |
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DataOffset int64 |
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TempOffset int64 |
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Size int64 |
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Next *WrittenIntervalNode |
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} |
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|
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type WrittenIntervalLinkedList struct { |
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tempFile *os.File |
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Head *WrittenIntervalNode |
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Tail *WrittenIntervalNode |
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} |
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|
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type WrittenContinuousIntervals struct { |
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tempFile *os.File |
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lastOffset int64 |
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lists []*WrittenIntervalLinkedList |
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} |
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|
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func (list *WrittenIntervalLinkedList) Offset() int64 { |
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return list.Head.DataOffset |
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} |
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func (list *WrittenIntervalLinkedList) Size() int64 { |
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return list.Tail.DataOffset + list.Tail.Size - list.Head.DataOffset |
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} |
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func (list *WrittenIntervalLinkedList) addNodeToTail(node *WrittenIntervalNode) { |
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// glog.V(4).Infof("add to tail [%d,%d) + [%d,%d) => [%d,%d)", list.Head.Offset, list.Tail.Offset+list.Tail.Size, node.Offset, node.Offset+node.Size, list.Head.Offset, node.Offset+node.Size)
|
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if list.Tail.TempOffset+list.Tail.Size == node.TempOffset { |
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// already connected
|
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list.Tail.Size += node.Size |
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} else { |
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list.Tail.Next = node |
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list.Tail = node |
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} |
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} |
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func (list *WrittenIntervalLinkedList) addNodeToHead(node *WrittenIntervalNode) { |
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// glog.V(4).Infof("add to head [%d,%d) + [%d,%d) => [%d,%d)", node.Offset, node.Offset+node.Size, list.Head.Offset, list.Tail.Offset+list.Tail.Size, node.Offset, list.Tail.Offset+list.Tail.Size)
|
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node.Next = list.Head |
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list.Head = node |
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} |
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|
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func (list *WrittenIntervalLinkedList) ReadData(buf []byte, start, stop int64) { |
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t := list.Head |
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for { |
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|
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nodeStart, nodeStop := max(start, t.DataOffset), min(stop, t.DataOffset+t.Size) |
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if nodeStart < nodeStop { |
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// glog.V(4).Infof("copying start=%d stop=%d t=[%d,%d) => bufSize=%d nodeStart=%d, nodeStop=%d", start, stop, t.DataOffset, t.DataOffset+t.Size, len(buf), nodeStart, nodeStop)
|
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list.tempFile.ReadAt(buf[nodeStart-start:nodeStop-start], t.TempOffset + nodeStart - t.DataOffset) |
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} |
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|
|||
if t.Next == nil { |
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break |
|||
} |
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t = t.Next |
|||
} |
|||
} |
|||
|
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func (c *WrittenContinuousIntervals) TotalSize() (total int64) { |
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for _, list := range c.lists { |
|||
total += list.Size() |
|||
} |
|||
return |
|||
} |
|||
|
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func (list *WrittenIntervalLinkedList) subList(start, stop int64) *WrittenIntervalLinkedList { |
|||
var nodes []*WrittenIntervalNode |
|||
for t := list.Head; t != nil; t = t.Next { |
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nodeStart, nodeStop := max(start, t.DataOffset), min(stop, t.DataOffset+t.Size) |
|||
if nodeStart >= nodeStop { |
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// skip non overlapping WrittenIntervalNode
|
|||
continue |
|||
} |
|||
nodes = append(nodes, &WrittenIntervalNode{ |
|||
TempOffset: t.TempOffset + nodeStart - t.DataOffset, |
|||
DataOffset: nodeStart, |
|||
Size: nodeStop - nodeStart, |
|||
Next: nil, |
|||
}) |
|||
} |
|||
for i := 1; i < len(nodes); i++ { |
|||
nodes[i-1].Next = nodes[i] |
|||
} |
|||
return &WrittenIntervalLinkedList{ |
|||
tempFile: list.tempFile, |
|||
Head: nodes[0], |
|||
Tail: nodes[len(nodes)-1], |
|||
} |
|||
} |
|||
|
|||
func (c *WrittenContinuousIntervals) debug() { |
|||
log.Printf("++") |
|||
for _, l := range c.lists { |
|||
log.Printf("++++") |
|||
for t := l.Head; ; t = t.Next { |
|||
log.Printf("[%d,%d) => [%d,%d) %d", t.DataOffset, t.DataOffset+t.Size, t.TempOffset, t.TempOffset+t.Size, t.Size) |
|||
if t.Next == nil { |
|||
break |
|||
} |
|||
} |
|||
log.Printf("----") |
|||
} |
|||
log.Printf("--") |
|||
} |
|||
|
|||
func (c *WrittenContinuousIntervals) AddInterval(tempOffset int64, dataSize int, dataOffset int64) { |
|||
|
|||
interval := &WrittenIntervalNode{DataOffset: dataOffset, TempOffset: tempOffset, Size: int64(dataSize)} |
|||
|
|||
// append to the tail and return
|
|||
if len(c.lists) == 1 { |
|||
lastSpan := c.lists[0] |
|||
if lastSpan.Tail.DataOffset+lastSpan.Tail.Size == dataOffset { |
|||
lastSpan.addNodeToTail(interval) |
|||
return |
|||
} |
|||
} |
|||
|
|||
var newLists []*WrittenIntervalLinkedList |
|||
for _, list := range c.lists { |
|||
// if list is to the left of new interval, add to the new list
|
|||
if list.Tail.DataOffset+list.Tail.Size <= interval.DataOffset { |
|||
newLists = append(newLists, list) |
|||
} |
|||
// if list is to the right of new interval, add to the new list
|
|||
if interval.DataOffset+interval.Size <= list.Head.DataOffset { |
|||
newLists = append(newLists, list) |
|||
} |
|||
// if new interval overwrite the right part of the list
|
|||
if list.Head.DataOffset < interval.DataOffset && interval.DataOffset < list.Tail.DataOffset+list.Tail.Size { |
|||
// create a new list of the left part of existing list
|
|||
newLists = append(newLists, list.subList(list.Offset(), interval.DataOffset)) |
|||
} |
|||
// if new interval overwrite the left part of the list
|
|||
if list.Head.DataOffset < interval.DataOffset+interval.Size && interval.DataOffset+interval.Size < list.Tail.DataOffset+list.Tail.Size { |
|||
// create a new list of the right part of existing list
|
|||
newLists = append(newLists, list.subList(interval.DataOffset+interval.Size, list.Tail.DataOffset+list.Tail.Size)) |
|||
} |
|||
// skip anything that is fully overwritten by the new interval
|
|||
} |
|||
|
|||
c.lists = newLists |
|||
// add the new interval to the lists, connecting neighbor lists
|
|||
var prevList, nextList *WrittenIntervalLinkedList |
|||
|
|||
for _, list := range c.lists { |
|||
if list.Head.DataOffset == interval.DataOffset+interval.Size { |
|||
nextList = list |
|||
break |
|||
} |
|||
} |
|||
|
|||
for _, list := range c.lists { |
|||
if list.Head.DataOffset+list.Size() == dataOffset { |
|||
list.addNodeToTail(interval) |
|||
prevList = list |
|||
break |
|||
} |
|||
} |
|||
|
|||
if prevList != nil && nextList != nil { |
|||
// glog.V(4).Infof("connecting [%d,%d) + [%d,%d) => [%d,%d)", prevList.Head.Offset, prevList.Tail.Offset+prevList.Tail.Size, nextList.Head.Offset, nextList.Tail.Offset+nextList.Tail.Size, prevList.Head.Offset, nextList.Tail.Offset+nextList.Tail.Size)
|
|||
prevList.Tail.Next = nextList.Head |
|||
prevList.Tail = nextList.Tail |
|||
c.removeList(nextList) |
|||
} else if nextList != nil { |
|||
// add to head was not done when checking
|
|||
nextList.addNodeToHead(interval) |
|||
} |
|||
if prevList == nil && nextList == nil { |
|||
c.lists = append(c.lists, &WrittenIntervalLinkedList{ |
|||
tempFile: c.tempFile, |
|||
Head: interval, |
|||
Tail: interval, |
|||
}) |
|||
} |
|||
|
|||
return |
|||
} |
|||
|
|||
func (c *WrittenContinuousIntervals) RemoveLargestIntervalLinkedList() *WrittenIntervalLinkedList { |
|||
var maxSize int64 |
|||
maxIndex := -1 |
|||
for k, list := range c.lists { |
|||
if maxSize <= list.Size() { |
|||
maxSize = list.Size() |
|||
maxIndex = k |
|||
} |
|||
} |
|||
if maxSize <= 0 { |
|||
return nil |
|||
} |
|||
|
|||
t := c.lists[maxIndex] |
|||
t.tempFile = c.tempFile |
|||
c.lists = append(c.lists[0:maxIndex], c.lists[maxIndex+1:]...) |
|||
return t |
|||
|
|||
} |
|||
|
|||
func (c *WrittenContinuousIntervals) removeList(target *WrittenIntervalLinkedList) { |
|||
index := -1 |
|||
for k, list := range c.lists { |
|||
if list.Offset() == target.Offset() { |
|||
index = k |
|||
} |
|||
} |
|||
if index < 0 { |
|||
return |
|||
} |
|||
|
|||
c.lists = append(c.lists[0:index], c.lists[index+1:]...) |
|||
|
|||
} |
|||
|
|||
func (c *WrittenContinuousIntervals) ReadDataAt(data []byte, startOffset int64) (maxStop int64) { |
|||
for _, list := range c.lists { |
|||
start := max(startOffset, list.Offset()) |
|||
stop := min(startOffset+int64(len(data)), list.Offset()+list.Size()) |
|||
if start < stop { |
|||
list.ReadData(data[start-startOffset:], start, stop) |
|||
maxStop = max(maxStop, stop) |
|||
} |
|||
} |
|||
return |
|||
} |
|||
|
|||
func (l *WrittenIntervalLinkedList) ToReader(start int64, stop int64) io.Reader { |
|||
// TODO: optimize this to avoid another loop
|
|||
var readers []io.Reader |
|||
for t := l.Head; ; t = t.Next { |
|||
startOffset, stopOffset := max(t.DataOffset, start), min(t.DataOffset+t.Size, stop) |
|||
if startOffset < stopOffset { |
|||
// glog.V(4).Infof("ToReader read [%d,%d) from [%d,%d) %d", t.DataOffset, t.DataOffset+t.Size, t.TempOffset, t.TempOffset+t.Size, t.Size)
|
|||
readers = append(readers, newFileSectionReader(l.tempFile, startOffset-t.DataOffset+t.TempOffset, startOffset, stopOffset-startOffset)) |
|||
} |
|||
if t.Next == nil { |
|||
break |
|||
} |
|||
} |
|||
if len(readers) == 1 { |
|||
return readers[0] |
|||
} |
|||
return io.MultiReader(readers...) |
|||
} |
|||
|
|||
type FileSectionReader struct { |
|||
file *os.File |
|||
tempStartOffset int64 |
|||
Offset int64 |
|||
dataStart int64 |
|||
dataStop int64 |
|||
} |
|||
|
|||
var _ = io.Reader(&FileSectionReader{}) |
|||
|
|||
func newFileSectionReader(tempfile *os.File, offset int64, dataOffset int64, size int64) *FileSectionReader { |
|||
return &FileSectionReader{ |
|||
file: tempfile, |
|||
tempStartOffset: offset, |
|||
Offset: offset, |
|||
dataStart: dataOffset, |
|||
dataStop: dataOffset + size, |
|||
} |
|||
} |
|||
|
|||
func (f *FileSectionReader) Read(p []byte) (n int, err error) { |
|||
remaining := (f.dataStop - f.dataStart) - (f.Offset - f.tempStartOffset) |
|||
if remaining <= 0 { |
|||
return 0, io.EOF |
|||
} |
|||
dataLen := min(remaining, int64(len(p))) |
|||
// glog.V(4).Infof("reading [%d,%d) from %v [%d,%d)/[%d,%d) %d", f.Offset-f.tempStartOffset+f.dataStart, f.Offset-f.tempStartOffset+f.dataStart+dataLen, f.file.Name(), f.Offset, f.Offset+dataLen, f.tempStartOffset, f.tempStartOffset+f.dataStop-f.dataStart, f.dataStop-f.dataStart)
|
|||
n, err = f.file.ReadAt(p[:dataLen], f.Offset) |
|||
if n > 0 { |
|||
f.Offset += int64(n) |
|||
} else { |
|||
err = io.EOF |
|||
} |
|||
return |
|||
} |
|||
13
weed/statik/statik.go
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